USAP-DC

{"dp_type": "Dataset", "free_text": "Radiocarbon"}

[{"awards": "2200448 Simms, Alexander", "bounds_geometry": null, "date_created": "Fri, 10 May 2024 00:00:00 GMT", "description": "Radiocarbon dating is arguably the most common method for dating Quaternary deposits. However, accurate age assignments using radiocarbon dating are dependent on knowing the radiocarbon reservoir. For the coastal waters across Antarctica, the radiocarbon reservoirs show significant variation, ranging from 700 to 6,000 years depending on the material dated and the period in question. In this study, we examine the radiocarbon reservoir age for the shallow waters of the Southern Ocean using 23 whale bones salvaged from whaling stations operating on or near the Western Antarctic Peninsula between 1904 and 1916. The species origin of the bones had been identified previously as humpback, fin, or blue whales using sequences of mitochondrial (mt)DNA. We find an average reservoir age of 1050 +/- 135 years for these 23 whale bones, with a \u003c100 year difference in the reservoir age value by species. A comparison between our results and other studies through the Holocene suggest that the Southern Ocean surface water radiocarbon reservoir age has not significantly changed for the last 14,000 years. Combining our new ages with existing data sets provides insight to the stability of the Southern Ocean marine radiocarbon reservoir age, enhancing our understanding of ocean ventilation and upwelling dynamics throughout the Holocene.", "east": null, "geometry": null, "keywords": "Antarctica; C-14; Cryosphere; Radiocarbon Dates; Whale Bone; Whales", "locations": "Antarctica", "north": null, "nsf_funding_programs": "Antarctic Earth Sciences", "persons": "Divola, Claire; Simms, Alexander; Sremba, Angela; Baker, C. Scott; Friedlaender, Ari; Southon, John", "project_titles": "New constraints on 14C reservoirs around the Antarctic Peninsula and the Southern Ocean based on historically-harvested whale bones", "projects": [{"proj_uid": "p0010457", "repository": "USAP-DC", "title": "New constraints on 14C reservoirs around the Antarctic Peninsula and the Southern Ocean based on historically-harvested whale bones"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": null, "title": "Constraining the Radiocarbon Reservoir Age for the Southern Ocean Using Whale Bones Salvaged from Early 20th Century Whaling Stations", "uid": "601784", "west": null}, {"awards": "1826712 McMahon, Kelton; 1443424 McMahon, Kelton; 1443386 Emslie, Steven; 1443585 Polito, Michael", "bounds_geometry": ["POLYGON((-180 -61.59,-168.969 -61.59,-157.938 -61.59,-146.90699999999998 -61.59,-135.876 -61.59,-124.845 -61.59,-113.814 -61.59,-102.783 -61.59,-91.752 -61.59,-80.72099999999999 -61.59,-69.69 -61.59,-69.69 -63.195,-69.69 -64.8,-69.69 -66.405,-69.69 -68.01,-69.69 -69.61500000000001,-69.69 -71.22,-69.69 -72.825,-69.69 -74.43,-69.69 -76.035,-69.69 -77.64,-80.721 -77.64,-91.752 -77.64,-102.783 -77.64,-113.814 -77.64,-124.845 -77.64,-135.876 -77.64,-146.90699999999998 -77.64,-157.938 -77.64,-168.969 -77.64,180 -77.64,179.02100000000002 -77.64,178.042 -77.64,177.063 -77.64,176.084 -77.64,175.10500000000002 -77.64,174.126 -77.64,173.147 -77.64,172.168 -77.64,171.18900000000002 -77.64,170.21 -77.64,170.21 -76.035,170.21 -74.43,170.21 -72.825,170.21 -71.22,170.21 -69.61500000000001,170.21 -68.01,170.21 -66.405,170.21 -64.8,170.21 -63.195,170.21 -61.59,171.18900000000002 -61.59,172.168 -61.59,173.147 -61.59,174.126 -61.59,175.10500000000002 -61.59,176.084 -61.59,177.063 -61.59,178.042 -61.59,179.02100000000002 -61.59,-180 -61.59))"], "date_created": "Tue, 09 Jan 2024 00:00:00 GMT", "description": "This data set contains measurements of nitrogen (\u03b415N) stable isotope values of twelve individual amino acids from modern and excavated eggshell of Ad\u00e9lie penguins (Pygoscelis adelidae) from multiple sites around the Antarctic Peninsula and Ross Sea regions of Antarctica. Stable isotope analyses were conducted using a gas chromatograph coupled to a continuous flow stable isotope ratio mass spectrometer. Radiocarbon dates of excavated eggshells were estimated using accelerator Mass Spectrometry (AMS) on bone, feather, and egg membrane tissues from the same ornithogenic layer as the eggshell and were completed at the Rafter Radiocarbon Laboratory and New Zealand (NZA), Beta Analytic, Inc. (Beta). All dates were corrected for the marine carbon reservoir effect and calibrated to calendar years before present (cal years BP) using a \u0394R of 750\u2009\u00b1\u200950 years and the MARINE13 calibration curve in Calib 7.0 (2\u03c3 range). \r\n\r\nThis data set indexes each individually analyzed eggshell sample with site (location), latitude, longitude, tissue used from radiocarbon dating, age of the sample, and nitrogen stable isotope values of individual amino acids. Details of the data set and all relevant methods are provided in Michelson et al. 2023 Limnol. Oceanogr. DOI:10.1002/lno.12446", "east": 170.21, "geometry": ["POINT(-129.74 -69.61500000000001)"], "keywords": "Adelie Penguin; Amino Acids; Antarctica; Antarctic Peninsula; Ross Sea; Stable Isotope Analysis; Trophic Position", "locations": "Antarctica; Ross Sea; Antarctic Peninsula", "north": -61.59, "nsf_funding_programs": "Antarctic Organisms and Ecosystems; Antarctic Organisms and Ecosystems; Antarctic Organisms and Ecosystems; Antarctic Organisms and Ecosystems", "persons": "Michelson, Chantel; Polito, Michael; Wonder, Michael; McCarthy, Matthew; Patterson, William; McMahon, Kelton; Emslie, Steven D.", "project_titles": "Collaborative Research: Investigating Holocene Shifts in the Diets and Paleohistory of Antarctic Krill Predators", "projects": [{"proj_uid": "p0010047", "repository": "USAP-DC", "title": "Collaborative Research: Investigating Holocene Shifts in the Diets and Paleohistory of Antarctic Krill Predators"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -77.64, "title": "Amino acid nitrogen isotope values of modern and ancient Ad\u00e9lie penguin eggshells from the Ross Sea and Antarctic Peninsula regions", "uid": "601760", "west": -69.69}, {"awards": "1543347 Rosenheim, Brad", "bounds_geometry": ["POINT(-149.59134 -84.640287)"], "date_created": "Mon, 13 Mar 2023 00:00:00 GMT", "description": "This dataset includes radiocarbon (\u00b9\u2074C) and stable carbon isotope (\u03b4\u00b9\u00b3C) data for a sediment core from Mercer Subglacial Lake. In addition, this dataset includes \u00b9\u2074C and \u03b4\u00b9\u00b3C for dissolved organic carbon, dissolved inorganic carbon, and particulate organic carbon from the Mercer Subglacial Lake water column. ", "east": -149.59134, "geometry": ["POINT(-149.59134 -84.640287)"], "keywords": "Antarctica; Isotope; Mercer Subglacial Lake; Radiocarbon; Subglacial Lake", "locations": "Antarctica; Mercer Subglacial Lake", "north": -84.640287, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Venturelli, Ryan; Rosenheim, Brad", "project_titles": "Collaborative Research: Subglacial Antarctic Lakes Scientific Access (SALSA): Integrated Study of Carbon Cycling in Hydrologically-active Subglacial Environments", "projects": [{"proj_uid": "p0010119", "repository": "USAP-DC", "title": "Collaborative Research: Subglacial Antarctic Lakes Scientific Access (SALSA): Integrated Study of Carbon Cycling in Hydrologically-active Subglacial Environments"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -84.640287, "title": "Mercer Subglacial Lake radiocarbon and stable isotope data ", "uid": "601672", "west": -149.59134}, {"awards": "1644197 Simms, Alexander", "bounds_geometry": null, "date_created": "Mon, 19 Dec 2022 00:00:00 GMT", "description": "This dataset consists of the location, elevation, and age of samples obtained from Joinville Island along the Antarctic Peninsula", "east": null, "geometry": null, "keywords": "Antarctica; Joinville Island; Raised Beaches; Sea Level", "locations": "Joinville Island; Antarctica", "north": null, "nsf_funding_programs": "Antarctic Earth Sciences", "persons": "Simms, Alexander", "project_titles": "Collaborative Research: New Constraints on Post-Glacial Rebound and Holocene Environmental History along the Northern Antarctic Peninsula from Raised Beaches", "projects": [{"proj_uid": "p0010132", "repository": "USAP-DC", "title": "Collaborative Research: New Constraints on Post-Glacial Rebound and Holocene Environmental History along the Northern Antarctic Peninsula from Raised Beaches"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": null, "title": "Radiocarbon Ages from Beaches on Joinville Island, Antarctic Peninsula", "uid": "601634", "west": null}, {"awards": "1643248 Hall, Brenda", "bounds_geometry": ["POLYGON((163.2 -78.1,163.26 -78.1,163.32 -78.1,163.38 -78.1,163.44 -78.1,163.5 -78.1,163.56 -78.1,163.62 -78.1,163.68 -78.1,163.74 -78.1,163.8 -78.1,163.8 -78.11999999999999,163.8 -78.14,163.8 -78.16,163.8 -78.17999999999999,163.8 -78.19999999999999,163.8 -78.22,163.8 -78.24,163.8 -78.25999999999999,163.8 -78.28,163.8 -78.3,163.74 -78.3,163.68 -78.3,163.62 -78.3,163.56 -78.3,163.5 -78.3,163.44 -78.3,163.38 -78.3,163.32 -78.3,163.26 -78.3,163.2 -78.3,163.2 -78.28,163.2 -78.25999999999999,163.2 -78.24,163.2 -78.22,163.2 -78.19999999999999,163.2 -78.17999999999999,163.2 -78.16,163.2 -78.14,163.2 -78.11999999999999,163.2 -78.1))"], "date_created": "Tue, 18 Oct 2022 00:00:00 GMT", "description": "This dataset contains radiocarbon dates of subfossil algal mats associated with Ross Sea drift near Walcott and Howchin Glaciers, southern Royal Society Range. These dates constrain the age of Ross Sea drift in this region. ", "east": 163.8, "geometry": ["POINT(163.5 -78.19999999999999)"], "keywords": "Algae; Antarctica; Glaciers/ice Sheet; Glaciers/Ice Sheet; Glaciology; Howchin Glacier; Radiocarbon; Radiocarbon Dates; Ross Sea Drift; Royal Society Range; Walcott Glacier", "locations": "Antarctica; Howchin Glacier; Walcott Glacier; Ross Sea Drift; Royal Society Range", "north": -78.1, "nsf_funding_programs": "Antarctic Earth Sciences", "persons": "Hall, Brenda", "project_titles": "Response of the Antarctic Ice Sheet to the last great global warming", "projects": [{"proj_uid": "p0010301", "repository": "USAP-DC", "title": "Response of the Antarctic Ice Sheet to the last great global warming"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -78.3, "title": "Walcott Glacier area radiocarbon data", "uid": "601615", "west": 163.2}, {"awards": "1643248 Hall, Brenda", "bounds_geometry": ["POLYGON((163 -78.1,163.07 -78.1,163.14 -78.1,163.21 -78.1,163.28 -78.1,163.35 -78.1,163.42 -78.1,163.48999999999998 -78.1,163.56 -78.1,163.63 -78.1,163.7 -78.1,163.7 -78.13,163.7 -78.16,163.7 -78.19,163.7 -78.22,163.7 -78.25,163.7 -78.28,163.7 -78.31,163.7 -78.34,163.7 -78.37,163.7 -78.4,163.63 -78.4,163.56 -78.4,163.48999999999998 -78.4,163.42 -78.4,163.35 -78.4,163.28 -78.4,163.21 -78.4,163.14 -78.4,163.07 -78.4,163 -78.4,163 -78.37,163 -78.34,163 -78.31,163 -78.28,163 -78.25,163 -78.22,163 -78.19,163 -78.16,163 -78.13,163 -78.1))"], "date_created": "Mon, 17 Oct 2022 00:00:00 GMT", "description": "This dataset contains radiocarbon dates of subfossil algal mats associated with Ross Sea drift in Pyramid Trough. These dates constrain the age of Ross Sea drift in this region. The dataset also includes dates of modern algae.", "east": 163.7, "geometry": ["POINT(163.35 -78.25)"], "keywords": "Algae; Antarctica; Glaciers/ice Sheet; Glaciers/Ice Sheet; Pyramid Trough; Radiocarbon; Radiocarbon Dates; Ross Sea Drift; Royal Society Range", "locations": "Pyramid Trough; Ross Sea Drift; Antarctica; Royal Society Range", "north": -78.1, "nsf_funding_programs": "Antarctic Earth Sciences", "persons": "Hall, Brenda", "project_titles": "Response of the Antarctic Ice Sheet to the last great global warming", "projects": [{"proj_uid": "p0010301", "repository": "USAP-DC", "title": "Response of the Antarctic Ice Sheet to the last great global warming"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -78.4, "title": "Pyramid Trough Radiocarbon Data", "uid": "601614", "west": 163.0}, {"awards": "0944150 Hall, Brenda", "bounds_geometry": ["POLYGON((163.7 -77.9,163.79 -77.9,163.88 -77.9,163.97 -77.9,164.06 -77.9,164.15 -77.9,164.24 -77.9,164.33 -77.9,164.42 -77.9,164.51 -77.9,164.6 -77.9,164.6 -77.91,164.6 -77.92,164.6 -77.93,164.6 -77.94,164.6 -77.95,164.6 -77.96,164.6 -77.97,164.6 -77.98,164.6 -77.99,164.6 -78,164.51 -78,164.42 -78,164.33 -78,164.24 -78,164.15 -78,164.06 -78,163.97 -78,163.88 -78,163.79 -78,163.7 -78,163.7 -77.99,163.7 -77.98,163.7 -77.97,163.7 -77.96,163.7 -77.95,163.7 -77.94,163.7 -77.93,163.7 -77.92,163.7 -77.91,163.7 -77.9))"], "date_created": "Wed, 20 Apr 2022 00:00:00 GMT", "description": "This dataset includes radiocarbon dates of benthic algal mats associated with last glacial maximum Ross Sea drift in Salmon Valley, Royal Society Range.", "east": 164.6, "geometry": ["POINT(164.15 -77.95)"], "keywords": "Antarctica; Last Glacial Maximum; McMurdo Sound; Radiocarbon Dates; Ross Sea Drift; Royal Society Range", "locations": "McMurdo Sound; Ross Sea Drift; Antarctica; Royal Society Range", "north": -77.9, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Hall, Brenda", "project_titles": "Sensitivity of the Antarctic Ice Sheet to Climate Change over the Last Two Glacial/Interglacial Cycles", "projects": [{"proj_uid": "p0010302", "repository": "USAP-DC", "title": "Sensitivity of the Antarctic Ice Sheet to Climate Change over the Last Two Glacial/Interglacial Cycles"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -78.0, "title": "Salmon Valley Radiocarbon Data", "uid": "601556", "west": 163.7}, {"awards": "0944150 Hall, Brenda", "bounds_geometry": ["POLYGON((163.5 -77.3,163.65 -77.3,163.8 -77.3,163.95 -77.3,164.1 -77.3,164.25 -77.3,164.4 -77.3,164.55 -77.3,164.7 -77.3,164.85 -77.3,165 -77.3,165 -77.39,165 -77.48,165 -77.57,165 -77.66,165 -77.75,165 -77.84,165 -77.93,165 -78.02,165 -78.11,165 -78.2,164.85 -78.2,164.7 -78.2,164.55 -78.2,164.4 -78.2,164.25 -78.2,164.1 -78.2,163.95 -78.2,163.8 -78.2,163.65 -78.2,163.5 -78.2,163.5 -78.11,163.5 -78.02,163.5 -77.93,163.5 -77.84,163.5 -77.75,163.5 -77.66,163.5 -77.57,163.5 -77.48,163.5 -77.39,163.5 -77.3))"], "date_created": "Wed, 20 Apr 2022 00:00:00 GMT", "description": "This dataset contains radiocarbon dates of benthic algal (cyanobacterial) mats within moraines associated with Ross Sea drift on the headlands of the Royal Society Range and covers the time period ~12-20 ka.", "east": 165.0, "geometry": ["POINT(164.25 -77.75)"], "keywords": "Antarctica; Last Glacial Maximum; McMurdo Sound; Radiocarbon Dates; Ross Sea Drift; Royal Society Range", "locations": "Royal Society Range; Royal Society Range; Ross Sea Drift; McMurdo Sound; Antarctica", "north": -77.3, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Hall, Brenda", "project_titles": "Sensitivity of the Antarctic Ice Sheet to Climate Change over the Last Two Glacial/Interglacial Cycles", "projects": [{"proj_uid": "p0010302", "repository": "USAP-DC", "title": "Sensitivity of the Antarctic Ice Sheet to Climate Change over the Last Two Glacial/Interglacial Cycles"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -78.2, "title": "Royal Society Range Headland Moraine Belt Radiocarbon Data", "uid": "601555", "west": 163.5}, {"awards": "1738989 Venturelli, Ryan", "bounds_geometry": ["POLYGON((-105 -73,-104.5 -73,-104 -73,-103.5 -73,-103 -73,-102.5 -73,-102 -73,-101.5 -73,-101 -73,-100.5 -73,-100 -73,-100 -73.1,-100 -73.2,-100 -73.3,-100 -73.4,-100 -73.5,-100 -73.6,-100 -73.7,-100 -73.8,-100 -73.9,-100 -74,-100.5 -74,-101 -74,-101.5 -74,-102 -74,-102.5 -74,-103 -74,-103.5 -74,-104 -74,-104.5 -74,-105 -74,-105 -73.9,-105 -73.8,-105 -73.7,-105 -73.6,-105 -73.5,-105 -73.4,-105 -73.3,-105 -73.2,-105 -73.1,-105 -73))"], "date_created": "Mon, 11 Apr 2022 00:00:00 GMT", "description": "This dataset includes radiocarbon dates and elevations of organic samples in raised beaches in the Edwards, Lindsey, and Schaefer Islands. It also includes a limited number of cosmogenic exposure-age data of bedrock from these islands.", "east": -100.0, "geometry": ["POINT(-102.5 -73.5)"], "keywords": "Antarctica; Pine Island Bay; Radiocarbon; Raised Beaches", "locations": "Pine Island Bay; Pine Island Bay; Antarctica", "north": -73.0, "nsf_funding_programs": "Antarctic Earth Sciences", "persons": "Braddock, Scott; Hall, Brenda", "project_titles": "NSF-NERC: Geological History Constraints on the Magnitude of Grounding Line Retreat in the Thwaites Glacier System", "projects": [{"proj_uid": "p0010165", "repository": "USAP-DC", "title": "NSF-NERC: Geological History Constraints on the Magnitude of Grounding Line Retreat in the Thwaites Glacier System"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": "Thwaites (ITGC)", "south": -74.0, "title": "Pine Island Bay Relative Sea-Level Data", "uid": "601554", "west": -105.0}, {"awards": "1643248 Hall, Brenda; 0944150 Hall, Brenda", "bounds_geometry": ["POLYGON((164 -78,164.04 -78,164.08 -78,164.12 -78,164.16 -78,164.2 -78,164.24 -78,164.28 -78,164.32 -78,164.36 -78,164.4 -78,164.4 -78.01,164.4 -78.02,164.4 -78.03,164.4 -78.04,164.4 -78.05,164.4 -78.06,164.4 -78.07,164.4 -78.08,164.4 -78.09,164.4 -78.1,164.36 -78.1,164.32 -78.1,164.28 -78.1,164.24 -78.1,164.2 -78.1,164.16 -78.1,164.12 -78.1,164.08 -78.1,164.04 -78.1,164 -78.1,164 -78.09,164 -78.08,164 -78.07,164 -78.06,164 -78.05,164 -78.04,164 -78.03,164 -78.02,164 -78.01,164 -78))"], "date_created": "Tue, 01 Mar 2022 00:00:00 GMT", "description": "This dataset contains raw and calibrated radiocarbon data for lacustrine algal layers from glacial lacustrine deposits associated with Ross Sea drift in Marshall Valley.", "east": 164.4, "geometry": ["POINT(164.2 -78.05)"], "keywords": "Algae; Antarctica; Glaciers/ice Sheet; Glaciers/Ice Sheet; Marshall Valley; Radiocarbon; Ross Sea Drift; Royal Society Range", "locations": "Antarctica; Marshall Valley; Royal Society Range; Ross Sea Drift", "north": -78.0, "nsf_funding_programs": "Antarctic Earth Sciences; Antarctic Glaciology", "persons": "Hall, Brenda", "project_titles": "Response of the Antarctic Ice Sheet to the last great global warming; Sensitivity of the Antarctic Ice Sheet to Climate Change over the Last Two Glacial/Interglacial Cycles", "projects": [{"proj_uid": "p0010302", "repository": "USAP-DC", "title": "Sensitivity of the Antarctic Ice Sheet to Climate Change over the Last Two Glacial/Interglacial Cycles"}, {"proj_uid": "p0010301", "repository": "USAP-DC", "title": "Response of the Antarctic Ice Sheet to the last great global warming"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -78.1, "title": "Marshall Valley Radiocarbon Data", "uid": "601529", "west": 164.0}, {"awards": "1443386 Emslie, Steven", "bounds_geometry": ["POINT(162.95 -75.55)"], "date_created": "Thu, 24 Sep 2020 00:00:00 GMT", "description": "This dataset provides the results of radiocarbon and stable isotope analyses of Adelie penguin chick bone collagen.", "east": 162.95, "geometry": ["POINT(162.95 -75.55)"], "keywords": "Adelie Penguin; Antarctica; Cape Irizar; Drygalski Ice Tongue; Ross Sea; Stable Isotopes", "locations": "Antarctica; Cape Irizar; Drygalski Ice Tongue; Ross Sea", "north": -75.55, "nsf_funding_programs": "Antarctic Organisms and Ecosystems", "persons": "Emslie, Steven D.", "project_titles": "Collaborative Research: Investigating Holocene Shifts in the Diets and Paleohistory of Antarctic Krill Predators", "projects": [{"proj_uid": "p0010047", "repository": "USAP-DC", "title": "Collaborative Research: Investigating Holocene Shifts in the Diets and Paleohistory of Antarctic Krill Predators"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -75.55, "title": "Ancient Adelie penguin colony revealed by snowmelt at Cape Irizar, Ross Sea, Antarctica", "uid": "601374", "west": 162.95}, {"awards": "1826712 McMahon, Kelton; 1443585 Polito, Michael; 1443386 Emslie, Steven; 1443424 McMahon, Kelton", "bounds_geometry": ["POINT(-54.67855 -63.434067)"], "date_created": "Fri, 24 Jul 2020 00:00:00 GMT", "description": "This data set focuses on ornithogenic soils excavated from a test pit located in an active colony of Pygoscelis spp. penguins on Platter Island in the Danger Islands archipelago along the northeastern side of the Antarctic Peninsula in December 2015. It contains radiocarbon dates of recovered penguin tissues and the estimated age of ornithogenic soils by depth. It also contains measurements of carbon (\u03b413C) and nitrogen (\u03b415N) stable isotope values of Pygoscelis spp. penguins eggshell membrane and feather samples and Antarctic fur seal (Arctocephalus gazella) hair sample recovered from these ornithogenic soils. Accelerator Mass Spectrometry (AMS) was used to obtain radiocarbon dates at the Woods Hole National Ocean Sciences Accelerator Mass Spectrometry (NOSAMS) facility. Radiocarbon Dates were corrected for the marine carbon reservoir effect and calibrated to calendar years before present (cal years BP) using a \u0394R of 750\u2009\u00b1\u200950 years and the MARINE13 calibration curve in Calib 7.04. The rbacon package ver. 2.3.9.1 in R was used to estimate age at depth of each soil level expressed as years relative to the common era (CE). Stable isotope analyses were conducted using an elemental analyzer coupled to a continuous flow stable isotope ratio mass spectrometer at Louisiana State University. The data set also includes associated data such as excavation date, location, site names, latitude/longitude, species, date of excavation, tissue used for radiocarbon dating, and carbon to nitrogen ratios. Details of the data set and all relevant methods are provided in Kalvakaalva et. al., 2020.", "east": -54.67855, "geometry": ["POINT(-54.67855 -63.434067)"], "keywords": "Antarctica; Antarctic Peninsula; Arctocephalus Gazella; Carbon; Holocene; Nitrogen; Paleoecology; Penguin; Pygoscelis Spp.; Stable Isotope Analysis; Weddell Sea", "locations": "Antarctica; Antarctic Peninsula; Weddell Sea", "north": -63.434067, "nsf_funding_programs": "Antarctic Organisms and Ecosystems; Antarctic Organisms and Ecosystems; Antarctic Organisms and Ecosystems; Antarctic Organisms and Ecosystems", "persons": "Kalvakaalva, Rohit; Clucas, Gemma; Herman, Rachael; Polito, Michael", "project_titles": "Collaborative Research: Investigating Holocene Shifts in the Diets and Paleohistory of Antarctic Krill Predators", "projects": [{"proj_uid": "p0010047", "repository": "USAP-DC", "title": "Collaborative Research: Investigating Holocene Shifts in the Diets and Paleohistory of Antarctic Krill Predators"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -63.434067, "title": "Radiocarbon dating and stable isotope values of penguin and seal tissues recovered from ornithogenic soils on Platter Island, Danger Islands Archipelago, Antarctic Peninsula in December 2015.", "uid": "601364", "west": -54.67855}, {"awards": null, "bounds_geometry": ["POINT(-163.61187 -84.33543)"], "date_created": "Wed, 15 Jul 2020 00:00:00 GMT", "description": "This dataset contains total organic carbon (%TOC) and carbon isotopic data (\u03b4\u00b9\u00b3C, \u0394\u00b9\u2074C) from sediments retrieved from the Whillans Ice Stream grounding zone during the 2015 Antarctic field season. All %TOC and sediment preparations were done at the University of South Florida. Radiocarbon measurements were done at the National Ocean Sciences Accelerator Mass Spectrometry (NOSAMS) laboratory. ", "east": -163.61187, "geometry": ["POINT(-163.61187 -84.33543)"], "keywords": "Antarctica; Radiocarbon; Sediment; Whillans Ice Stream", "locations": "Whillans Ice Stream; Antarctica", "north": -84.33543, "nsf_funding_programs": null, "persons": "Venturelli, Ryan A", "project_titles": "Collaborative Research: Subglacial Antarctic Lakes Scientific Access (SALSA): Integrated Study of Carbon Cycling in Hydrologically-active Subglacial Environments", "projects": [{"proj_uid": "p0010119", "repository": "USAP-DC", "title": "Collaborative Research: Subglacial Antarctic Lakes Scientific Access (SALSA): Integrated Study of Carbon Cycling in Hydrologically-active Subglacial Environments"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": "WISSARD", "south": -84.33543, "title": "Isotopic data from Whillans Ice Stream grounding zone, West Antarctica", "uid": "601360", "west": -163.61187}, {"awards": "1443386 Emslie, Steven", "bounds_geometry": ["POLYGON((-180 -60,-180 -60,-180 -60,-180 -60,-180 -60,-180 -60,-180 -60,-180 -60,-180 -60,-180 -60,-180 -60,-180 -61.130769444,-180 -62.261538888,-180 -63.392308332,-180 -64.523077776,-180 -65.65384722,-180 -66.784616664,-180 -67.915386108,-180 -69.046155552,-180 -70.176924996,-180 -71.30769444,-180 -71.30769444,-180 -71.30769444,-180 -71.30769444,-180 -71.30769444,-180 -71.30769444,-180 -71.30769444,-180 -71.30769444,-180 -71.30769444,-180 -71.30769444,180 -71.30769444,179.019305556 -71.30769444,178.038611112 -71.30769444,177.057916668 -71.30769444,176.077222224 -71.30769444,175.09652778 -71.30769444,174.115833336 -71.30769444,173.135138892 -71.30769444,172.154444448 -71.30769444,171.173750004 -71.30769444,170.19305556 -71.30769444,170.19305556 -70.176924996,170.19305556 -69.046155552,170.19305556 -67.915386108,170.19305556 -66.784616664,170.19305556 -65.65384722,170.19305556 -64.523077776,170.19305556 -63.392308332,170.19305556 -62.261538888,170.19305556 -61.130769444,170.19305556 -60,171.173750004 -60,172.154444448 -60,173.135138892 -60,174.115833336 -60,175.09652778 -60,176.077222224 -60,177.057916668 -60,178.038611112 -60,179.019305556 -60,-180 -60))"], "date_created": "Tue, 02 Jun 2020 00:00:00 GMT", "description": "We report new discoveries and radiocarbon dates on active and abandoned Ad\u00e9lie penguin (Pygoscelis adeliae) colonies at Cape Adare, Antarctica. This colony, first established at approximately 2000 BP (calendar years before present, i.e. 1950), is currently the largest for this species with approximately 338 000 breeding pairs, most located on lowlying Ridley Beach. We hypothesize that this colony first formed after fast ice began blocking open-water access by breeding penguins to the Scott Coast in the southern Ross Sea during a cooling period also at approximately 2000 BP. Our results suggest that the new colony at Cape Adare continued to grow, expanding to a large upper terrace above Ridley Beach, until it exceeded approximately 500 000 breeding pairs (a \u0027supercolony\u0027) by approximately 1200 BP. The high marine productivity associated with the Ross Sea polynya and continental shelf break supported this growth, but the colony collapsed to its present size for unknown reasons after approximately 1200 BP. Ridley Beach will probably be abandoned in the near future due to rising sea level in this region. We predict that penguins will retreat to higher elevations at Cape Adare and that the Scott Coast will be reoccupied by breeding penguins as fast ice continues to dissipate earlier each summer, restoring open-water access to beaches there.", "east": 170.19305556, "geometry": ["POINT(175.09652778 -65.65384722)"], "keywords": "Adelie Penguin; Antarctica; Biota; Cape Adare; East Antarctica; Population Movement; Pygoscelis Adeliae; Radiocarbon; Ross Sea; Sea Level Rise; Stable Isotopes", "locations": "Antarctica; East Antarctica; Ross Sea; Cape Adare", "north": -60.0, "nsf_funding_programs": "Antarctic Organisms and Ecosystems", "persons": "McKenzie, Ashley; Patterson, William; Emslie, Steven D.", "project_titles": "Collaborative Research: Investigating Holocene Shifts in the Diets and Paleohistory of Antarctic Krill Predators", "projects": [{"proj_uid": "p0010047", "repository": "USAP-DC", "title": "Collaborative Research: Investigating Holocene Shifts in the Diets and Paleohistory of Antarctic Krill Predators"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -71.30769444, "title": "The rise and fall of an ancient Adelie penguin \u0027supercolony\u0027 at Cape Adare, Antarctica", "uid": "601327", "west": -180.0}, {"awards": "0636773 DeMaster, David; 1341669 DeMaster, David", "bounds_geometry": ["POLYGON((-71 -64,-70.4 -64,-69.8 -64,-69.2 -64,-68.6 -64,-68 -64,-67.4 -64,-66.8 -64,-66.2 -64,-65.6 -64,-65 -64,-65 -64.7,-65 -65.4,-65 -66.1,-65 -66.8,-65 -67.5,-65 -68.2,-65 -68.9,-65 -69.6,-65 -70.3,-65 -71,-65.6 -71,-66.2 -71,-66.8 -71,-67.4 -71,-68 -71,-68.6 -71,-69.2 -71,-69.8 -71,-70.4 -71,-71 -71,-71 -70.3,-71 -69.6,-71 -68.9,-71 -68.2,-71 -67.5,-71 -66.8,-71 -66.1,-71 -65.4,-71 -64.7,-71 -64))"], "date_created": "Mon, 11 May 2020 00:00:00 GMT", "description": "This data set is used to describe a new technique for assessing labile organic carbon (LOC) abundances and mean residence times in marine sediments. Radiocarbon is used to determine abundances of labile organic carbon and then a diagenetic organic carbon model, coupled with sediment biotrubation coefficients, is used to assess LOC mean residence times. ", "east": -65.0, "geometry": ["POINT(-68 -67.5)"], "keywords": "Antarctica; Antarctic Peninsula; Biota; Bioturbation Coefficients; Diagenesis; Labile Organic Carbon; LOC Mean Residence Times; Marguerite Bay; Oceans; Organic Carbon Degradation Rates; Sediment Core", "locations": "Antarctica; Marguerite Bay; Antarctic Peninsula", "north": -64.0, "nsf_funding_programs": "Antarctic Organisms and Ecosystems; Antarctic Earth Sciences", "persons": "DeMaster, David; Taylor, Richard; Smith, Craig; Isla, Enrique; Thomas, Carrie", "project_titles": "Collaborative Research: Benthic Faunal Feeding Dynamics on the Antarctic Shelf and the Effects of Global Climate Change on Bentho-Pelagic Coupling; Using Radiochemical Data from Collapsed Ice Shelf Sediments to Understand the Nature and Timing of the Benthic Response to High-Latitude Climate Change", "projects": [{"proj_uid": "p0000552", "repository": "USAP-DC", "title": "Collaborative Research: Benthic Faunal Feeding Dynamics on the Antarctic Shelf and the Effects of Global Climate Change on Bentho-Pelagic Coupling"}, {"proj_uid": "p0000382", "repository": "USAP-DC", "title": "Using Radiochemical Data from Collapsed Ice Shelf Sediments to Understand the Nature and Timing of the Benthic Response to High-Latitude Climate Change"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -71.0, "title": "Labile Organic Carbon distributions on the West Antarctic Peninsula Shelf", "uid": "601319", "west": -71.0}, {"awards": "1826712 McMahon, Kelton; 1443585 Polito, Michael; 1443386 Emslie, Steven; 1443424 McMahon, Kelton", "bounds_geometry": ["POLYGON((162 -72,162.9 -72,163.8 -72,164.7 -72,165.6 -72,166.5 -72,167.4 -72,168.3 -72,169.2 -72,170.1 -72,171 -72,171 -72.6,171 -73.2,171 -73.8,171 -74.4,171 -75,171 -75.6,171 -76.2,171 -76.8,171 -77.4,171 -78,170.1 -78,169.2 -78,168.3 -78,167.4 -78,166.5 -78,165.6 -78,164.7 -78,163.8 -78,162.9 -78,162 -78,162 -77.4,162 -76.8,162 -76.2,162 -75.6,162 -75,162 -74.4,162 -73.8,162 -73.2,162 -72.6,162 -72))"], "date_created": "Tue, 03 Mar 2020 00:00:00 GMT", "description": "This data set contains measurements of carbon (\u03b413C) and nitrogen (\u03b415N) stable isotope values of feather, skin, bone, and toenail samples of mummified Ad\u00e9lie penguin chick remains excavated from multiple sites around the Ross Sea region of Antarctica between 2004 and 2016, as well as the same measurements for modern Ad\u00e9lie chicks collected from the surface of Cape Hallett and Adelie Cove in January 2016. Stable isotope analyses were conducted using an elemental analyzer coupled to a continuous flow stable isotope ratio mass spectrometer. Where possible, accelerator Mass Spectrometry (AMS) radiocarbon dates on selected mummy tissues were completed at the Rafter Radiocarbon Laboratory, New Zealand (NZA), Beta Analytic, Inc. (Beta), the University of Georgia Center for Applied Isotope Studies (UGAMS), and Woods Hole National Ocean Sciences Accelerator Mass Spectrometry (NOSAMS) facility. All dates were corrected for the marine carbon reservoir effect and calibrated to calendar years before present (cal years BP) using a \u0394R of 750\u2009\u00b1\u200950 years and the MARINE13 calibration curve in Calib 7.0 (2\u03c3 range). \r\nThe data set also includes excavation/collection site names and latitude/longitude, date of excavation/collection, tissue used for radiocarbon dating, and carbon to nitrogen ratios. Details of the data set and all relevant methods are provided in Kristan et. al., 2019.\r\n", "east": 171.0, "geometry": ["POINT(166.5 -75)"], "keywords": "Abandoned Colonies; Antarctica; Holocene; Penguin; Ross Sea; Stable Isotope Analysis", "locations": "Antarctica; Antarctica; Ross Sea", "north": -72.0, "nsf_funding_programs": "Antarctic Organisms and Ecosystems; Antarctic Organisms and Ecosystems; Antarctic Organisms and Ecosystems; Antarctic Organisms and Ecosystems", "persons": "Kristan, Allyson; Patterson, William; Emslie, Steven D.", "project_titles": "Collaborative Research: Investigating Holocene Shifts in the Diets and Paleohistory of Antarctic Krill Predators", "projects": [{"proj_uid": "p0010047", "repository": "USAP-DC", "title": "Collaborative Research: Investigating Holocene Shifts in the Diets and Paleohistory of Antarctic Krill Predators"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -78.0, "title": "Radioisotope dates and carbon (\u03b413C) and nitrogen (\u03b415N) stable isotope values from modern and mummified Ad\u00e9lie Penguin chick carcasses and tissue from the Ross Sea, Antarctica", "uid": "601263", "west": 162.0}, {"awards": "1443386 Emslie, Steven; 1443585 Polito, Michael; 1826712 McMahon, Kelton; 1443424 McMahon, Kelton", "bounds_geometry": ["POLYGON((-59 -62,-58.9 -62,-58.8 -62,-58.7 -62,-58.6 -62,-58.5 -62,-58.4 -62,-58.3 -62,-58.2 -62,-58.1 -62,-58 -62,-58 -62.1,-58 -62.2,-58 -62.3,-58 -62.4,-58 -62.5,-58 -62.6,-58 -62.7,-58 -62.8,-58 -62.9,-58 -63,-58.1 -63,-58.2 -63,-58.3 -63,-58.4 -63,-58.5 -63,-58.6 -63,-58.7 -63,-58.8 -63,-58.9 -63,-59 -63,-59 -62.9,-59 -62.8,-59 -62.7,-59 -62.6,-59 -62.5,-59 -62.4,-59 -62.3,-59 -62.2,-59 -62.1,-59 -62))"], "date_created": "Tue, 24 Sep 2019 00:00:00 GMT", "description": "Radiocarbon dates from pygoscelid penguin tissues from ornithogenic soils and beach deposits at Stranger Point, King George (25 de Mayo) Island, Antarctic Peninsula. Uncorrected dates are in radiocarbon years before present (BP); calibrated dates were corrected for the marine carbon reservoir effect (delta R = 700 +/- 50 years) and calibrated with Calib 7.0.4 to provide 2\u03c3 ranges in calendar years BP. All dates except were completed at the Woods Hole National Ocean Sciences Accelerator Mass Spectrometry (NOSAMS) facility and are designated with OS numbers. Localities include ancient penguin breedings sites (mounds, M), active colonies (I9, B3), and a mid-Holocene marine beach deposit (Pingfo 1).", "east": -58.0, "geometry": ["POINT(-58.5 -62.5)"], "keywords": "Abandoned Colonies; Antarctica; Antarctic Peninsula; Beach Deposit; Geochronology; Glaciers/ice Sheet; Glaciers/Ice Sheet; Glaciology; Holocene; Penguin; Radiocarbon; Radiocarbon Dates; Snow/ice; Snow/Ice; Stranger Point", "locations": "Stranger Point; Antarctic Peninsula; Antarctica", "north": -62.0, "nsf_funding_programs": "Antarctic Organisms and Ecosystems; Antarctic Organisms and Ecosystems; Antarctic Organisms and Ecosystems; Antarctic Organisms and Ecosystems", "persons": "Emslie, Steven D.", "project_titles": "Collaborative Research: Investigating Holocene Shifts in the Diets and Paleohistory of Antarctic Krill Predators", "projects": [{"proj_uid": "p0010047", "repository": "USAP-DC", "title": "Collaborative Research: Investigating Holocene Shifts in the Diets and Paleohistory of Antarctic Krill Predators"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -63.0, "title": "Radiocarbon dates from pygoscelid penguin tissues excavated at Stranger Point, King George Island, Antarctic Peninsula", "uid": "601212", "west": -59.0}, {"awards": "1443248 Hall, Brenda", "bounds_geometry": ["POLYGON((-170 -84,-168 -84,-166 -84,-164 -84,-162 -84,-160 -84,-158 -84,-156 -84,-154 -84,-152 -84,-150 -84,-150 -84.16,-150 -84.32,-150 -84.48,-150 -84.64,-150 -84.8,-150 -84.96,-150 -85.12,-150 -85.28,-150 -85.44,-150 -85.6,-152 -85.6,-154 -85.6,-156 -85.6,-158 -85.6,-160 -85.6,-162 -85.6,-164 -85.6,-166 -85.6,-168 -85.6,-170 -85.6,-170 -85.44,-170 -85.28,-170 -85.12,-170 -84.96,-170 -84.8,-170 -84.64,-170 -84.48,-170 -84.32,-170 -84.16,-170 -84))"], "date_created": "Thu, 05 Sep 2019 00:00:00 GMT", "description": "", "east": -150.0, "geometry": ["POINT(-160 -84.8)"], "keywords": "Antarctica; Carbon; Glaciology; Holocene; Radiocarbon; Ross Embayment; Ross Sea; Transantarctic Mountains", "locations": "Antarctica; Transantarctic Mountains; Ross Sea; Ross Embayment", "north": -84.0, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Hall, Brenda", "project_titles": "Collaborative Research: High-resolution Reconstruction of Holocene Deglaciation in the Southern Ross Embayment", "projects": [{"proj_uid": "p0010053", "repository": "USAP-DC", "title": "Collaborative Research: High-resolution Reconstruction of Holocene Deglaciation in the Southern Ross Embayment"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -85.6, "title": "Liv and Amundsen Glacier Radiocarbon Data", "uid": "601208", "west": -170.0}, {"awards": "1246378 Shevenell, Amelia", "bounds_geometry": ["POLYGON((70 -68,70.5 -68,71 -68,71.5 -68,72 -68,72.5 -68,73 -68,73.5 -68,74 -68,74.5 -68,75 -68,75 -68.2,75 -68.4,75 -68.6,75 -68.8,75 -69,75 -69.2,75 -69.4,75 -69.6,75 -69.8,75 -70,74.5 -70,74 -70,73.5 -70,73 -70,72.5 -70,72 -70,71.5 -70,71 -70,70.5 -70,70 -70,70 -69.8,70 -69.6,70 -69.4,70 -69.2,70 -69,70 -68.8,70 -68.6,70 -68.4,70 -68.2,70 -68))"], "date_created": "Fri, 10 May 2019 00:00:00 GMT", "description": "This dataset contains 14C data, magnetic susceptibility, relative grain size percentages, 10Be", "east": 75.0, "geometry": ["POINT(72.5 -69)"], "keywords": "Antarctica; Be-10; Glaciers/ice Sheet; Glaciers/Ice Sheet; Grain Size; Late Quaternary; Magnetic Susceptibility; Mass Spectrometry; NBP0101; Paleoenvironment; Prydz Bay; Radiocarbon; R/v Nathaniel B. Palmer; Sediment; Sediment Core; Sediment Core Data", "locations": "Antarctica; Prydz Bay", "north": -68.0, "nsf_funding_programs": "Antarctic Earth Sciences", "persons": "Shevenell, Amelia", "project_titles": "Late Quaternary Evolution of the Lambert Glacier/Amery Ice Shelf System, Prydz Bay, Antarctica", "projects": [{"proj_uid": "p0000381", "repository": "USAP-DC", "title": "Late Quaternary Evolution of the Lambert Glacier/Amery Ice Shelf System, Prydz Bay, Antarctica"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -70.0, "title": "Geochemical and sedimentologic data from NBP01-01 JPC-34", "uid": "601180", "west": 70.0}, {"awards": "1246353 Anderson, John", "bounds_geometry": ["POLYGON((-180 -74.37,-178.85 -74.37,-177.7 -74.37,-176.55 -74.37,-175.4 -74.37,-174.25 -74.37,-173.1 -74.37,-171.95 -74.37,-170.8 -74.37,-169.65 -74.37,-168.5 -74.37,-168.5 -74.747,-168.5 -75.124,-168.5 -75.501,-168.5 -75.878,-168.5 -76.255,-168.5 -76.632,-168.5 -77.009,-168.5 -77.386,-168.5 -77.763,-168.5 -78.14,-169.65 -78.14,-170.8 -78.14,-171.95 -78.14,-173.1 -78.14,-174.25 -78.14,-175.4 -78.14,-176.55 -78.14,-177.7 -78.14,-178.85 -78.14,180 -78.14,178.48 -78.14,176.96 -78.14,175.44 -78.14,173.92 -78.14,172.4 -78.14,170.88 -78.14,169.36 -78.14,167.84 -78.14,166.32 -78.14,164.8 -78.14,164.8 -77.763,164.8 -77.386,164.8 -77.009,164.8 -76.632,164.8 -76.255,164.8 -75.878,164.8 -75.501,164.8 -75.124,164.8 -74.747,164.8 -74.37,166.32 -74.37,167.84 -74.37,169.36 -74.37,170.88 -74.37,172.4 -74.37,173.92 -74.37,175.44 -74.37,176.96 -74.37,178.48 -74.37,-180 -74.37))"], "date_created": "Mon, 05 Feb 2018 00:00:00 GMT", "description": "Dataset includes details of cores collected as part of cruise NBP1502A, a list of radiocarbon-dated samples and samples to be radiocarbon-dated, and grain-size data from select NBP1502A cores.", "east": -168.5, "geometry": ["POINT(178.15 -76.255)"], "keywords": "Antarctica; Chemistry:sediment; Chemistry:Sediment; Geochronology; Marine Geoscience; Marine Sediments; NBP1502; R/v Nathaniel B. Palmer; Sediment Core", "locations": "Antarctica", "north": -74.37, "nsf_funding_programs": "Antarctic Earth Sciences", "persons": "Simkins, Lauren; Anderson, John; Prothro, Lindsay", "project_titles": "Evidence for Paleo Ice Stream Collapse in the Western Ross Sea since the Last Glacial Maximum.", "projects": [{"proj_uid": "p0000395", "repository": "USAP-DC", "title": "Evidence for Paleo Ice Stream Collapse in the Western Ross Sea since the Last Glacial Maximum."}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -78.14, "title": "NBP1502A Cruise Core Data", "uid": "601083", "west": 164.8}, {"awards": "1246170 Hall, Brenda", "bounds_geometry": ["POLYGON((155.4 -79.8,155.54 -79.8,155.68 -79.8,155.82 -79.8,155.96 -79.8,156.1 -79.8,156.24 -79.8,156.38 -79.8,156.52 -79.8,156.66 -79.8,156.8 -79.8,156.8 -79.82,156.8 -79.84,156.8 -79.86,156.8 -79.88,156.8 -79.9,156.8 -79.92,156.8 -79.94,156.8 -79.96,156.8 -79.98,156.8 -80,156.66 -80,156.52 -80,156.38 -80,156.24 -80,156.1 -80,155.96 -80,155.82 -80,155.68 -80,155.54 -80,155.4 -80,155.4 -79.98,155.4 -79.96,155.4 -79.94,155.4 -79.92,155.4 -79.9,155.4 -79.88,155.4 -79.86,155.4 -79.84,155.4 -79.82,155.4 -79.8))"], "date_created": "Mon, 23 Oct 2017 00:00:00 GMT", "description": "Hatherton Glacier Radiocarbon Data", "east": 156.8, "geometry": ["POINT(156.1 -79.9)"], "keywords": "Antarctica; Geochronology; Hatherton Glacier; Radiocarbon; Sample/collection Description; Sample/Collection Description; Transantarctic Mountains", "locations": "Hatherton Glacier; Antarctica; Transantarctic Mountains", "north": -79.8, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Hall, Brenda", "project_titles": "Collaborative Research: Assessing the Antarctic Contribution to Sea-level Changes during the Last Deglaciation: Constraints from Darwin Glacier", "projects": [{"proj_uid": "p0000304", "repository": "USAP-DC", "title": "Collaborative Research: Assessing the Antarctic Contribution to Sea-level Changes during the Last Deglaciation: Constraints from Darwin Glacier"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -80.0, "title": "Hatherton Glacier Radiocarbon Data", "uid": "601063", "west": 155.4}, {"awards": "0839031 Severinghaus, Jeffrey", "bounds_geometry": ["POINT(161.71965 -77.76165)"], "date_created": "Fri, 01 Jan 2016 00:00:00 GMT", "description": "This award supports a project to develop a precise gas-based chronology for an archive of large-volume samples of the ancient atmosphere, which would enable ultra-trace gas measurements that are currently precluded by sample size limitations of ice cores. The intellectual merit of the proposed work is that it will provide a critical test of the \u0027clathrate hypothesis\u0027 that methane clathrates contributed to the two abrupt atmospheric methane concentration increases during the last deglaciation 15 and 11 kyr ago. This approach employs large volumes of ice (\u003e1 ton) to measure carbon-14 on past atmospheric methane across the abrupt events. Carbon-14 is an ideal discriminator of fossil sources of methane to the atmosphere, because most methane sources (e.g., wetlands, termites, biomass burning) are rich in carbon-14, whereas clathrates and other fossil sources are devoid of carbon-14. The proposed work is a logical extension to Taylor Glacier, Antarctica, of an approach pioneered at the margin of the Greenland ice sheet over the past 7 years. The Greenland work found higher-than-expected carbon-14 values, likely due in part to contaminants stemming from the high impurity content of Greenland ice and the interaction of the ice with sediments from the glacier bed. The data also pointed to the possibility of a previously unknown process, in-situ cosmogenic production of carbon-14 methane (radiomethane) in the ice matrix. Antarctic ice in Taylor Glacier is orders of magnitude cleaner than the ice at the Greenland site, and is much colder and less stratigraphically disturbed, offering the potential for a clear resolution of this puzzle and a definitive test of the cosmogenic radiomethane hypothesis. Even if cosmogenic radiomethane in ice is found, it still may be possible to reconstruct atmospheric radiomethane with a correction enabled by a detailed understanding of the process, which will be sought by co-measuring carbon-14 in carbon monoxide and carbon dioxide. The broader impacts of the proposed work are that the clathrate test may shed light on the stability of the clathrate reservoir and its potential for climate feedbacks under human-induced warming. Development of Taylor Glacier as a \u0027horizontal ice core\u0027 would provide a community resource for other researchers. Education of one postdoc, one graduate student, and one undergraduate, would add to human resources. This award has field work in Antarctica.", "east": 161.71965, "geometry": ["POINT(161.71965 -77.76165)"], "keywords": "Antarctica; Cosmogenic; Geochemistry; Ice Core Records; Paleoclimate; Radiocarbon; Taylor Glacier; Transantarctic Mountains", "locations": "Transantarctic Mountains; Antarctica; Taylor Glacier", "north": -77.76165, "nsf_funding_programs": null, "persons": "Severinghaus, Jeffrey P.", "project_titles": "Collaborative Research: A \"Horizontal Ice Core\" for Large-Volume Samples of the Past Atmosphere, Taylor Glacier, Antarctica", "projects": [{"proj_uid": "p0000099", "repository": "USAP-DC", "title": "Collaborative Research: A \"Horizontal Ice Core\" for Large-Volume Samples of the Past Atmosphere, Taylor Glacier, Antarctica"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -77.76165, "title": "Measurements of in situ cosmogenic 14C from Taylor Glacier, Antarctica", "uid": "600165", "west": 161.71965}, {"awards": "0739575 Emslie, Steven", "bounds_geometry": ["POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -63,180 -66,180 -69,180 -72,180 -75,180 -78,180 -81,180 -84,180 -87,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87,-180 -84,-180 -81,-180 -78,-180 -75,-180 -72,-180 -69,-180 -66,-180 -63,-180 -60))"], "date_created": "Thu, 01 Jan 2015 00:00:00 GMT", "description": "The research combines interdisciplinary study in geology, paleontology, and biology, using stable isotope and radiocarbon analyses, to examine how climate change and resource utilization have influenced population distribution, movement, and diet in penguins during the mid-to-late Holocene. Previous investigations have demonstrated that abandoned colonies contain well-preserved remains that can be used to examine differential responses of penguins to climate change in various sectors of Antarctica. As such, the research team will investigate abandoned and active pygoscelid penguin (Adelie, Chinstrap, and Gentoo) colonies in the Antarctic Peninsula and Ross Sea regions, and possibly Prydz Bay, in collaboration with Chinese scientists during four field seasons. Stable isotope analyses will be conducted on recovered penguin tissues and prey remains in guano to address hypotheses on penguin occupation history, population movement, and diet in relation to climate change since the late Pleistocene. The study will include one Ph.D., two Masters and 16 undergraduate students in advanced research over the project period. Students will be exposed to a variety of fields, the scientific method, and international scientific research. They will complete field and lab research for individual projects or Honor\u0027s theses for academic credit. The project also will include web-based outreach, lectures to middle school students, and the development of interactive exercises that highlight hypothesis-driven research and the ecology of Antarctica. Two undergraduate students in French and Spanish languages at UNCW will be hired to assist in translating the Web page postings for broader access to this information.\n", "east": 180.0, "geometry": ["POINT(0 -89.999)"], "keywords": "Antarctica; Antarctic Peninsula; Biota; Geochronology; Global; Penguin; Ross Sea; Sample/collection Description; Sample/Collection Description; Scotia Sea; Southern Ocean", "locations": "Ross Sea; Antarctica; Southern Ocean; Antarctic Peninsula; Scotia Sea; Global", "north": -60.0, "nsf_funding_programs": null, "persons": "Patterson, William; Polito, Michael; Emslie, Steven D.", "project_titles": "Stable Isotope Analyses of Pygoscelid Penguin remains from Active and Abandoned Colonies in Antarctica", "projects": [{"proj_uid": "p0000317", "repository": "USAP-DC", "title": "Stable Isotope Analyses of Pygoscelid Penguin remains from Active and Abandoned Colonies in Antarctica"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -90.0, "title": "Stable Isotope Analyses of Pygoscelid Penguin remains from Active and Abandoned Colonies in Antarctica", "uid": "600145", "west": -180.0}, {"awards": "0902957 Robinson, Laura", "bounds_geometry": ["POLYGON((-70.5 -54.5,-66.95 -54.5,-63.4 -54.5,-59.85 -54.5,-56.3 -54.5,-52.75 -54.5,-49.2 -54.5,-45.65 -54.5,-42.1 -54.5,-38.55 -54.5,-35 -54.5,-35 -55.2,-35 -55.9,-35 -56.6,-35 -57.3,-35 -58,-35 -58.7,-35 -59.4,-35 -60.1,-35 -60.8,-35 -61.5,-38.55 -61.5,-42.1 -61.5,-45.65 -61.5,-49.2 -61.5,-52.75 -61.5,-56.3 -61.5,-59.85 -61.5,-63.4 -61.5,-66.95 -61.5,-70.5 -61.5,-70.5 -60.8,-70.5 -60.1,-70.5 -59.4,-70.5 -58.7,-70.5 -58,-70.5 -57.3,-70.5 -56.6,-70.5 -55.9,-70.5 -55.2,-70.5 -54.5))"], "date_created": "Sat, 01 Jan 2011 00:00:00 GMT", "description": "The proposal seeks funds to continue a follow-up analytical work of deep-sea corals collected in the Drake Passage during a research cruise. The project\u0027s goal is paleo-climate research looking to constrain the depth structure and time evolution of the radiocarbon content of the Southern Ocean during the glacial and deglaciation. Radiocarbon is a versatile tracer of past climate; its radioactive decay provides an internal clock with which to assess the rates of processes, and it can be used to trace the movement of carbon through the Earth\u0027s system. It enters the ocean through air-sea gas exchange, so processes that limits this will, therefore, reduce the radiocarbon content of both surface and deep waters. The Southern Ocean is a critical location for exchange of heat and carbon between the deep-ocean and atmospheric reservoirs, and the deep waters formed there fill large volumes of the global deep and intermediate oceans. As strong currents tend to scour away sediments, carbonate preservation is limited, and radiocarbon reservoir ages are poorly constrained, many traditional paleoceanographic techniques become impractical. It is proposed to alleviate these difficulties analyzing the chemical composition of deep-sea coral skeletons. Their aragonitic skeletons can be precisely dated using U-series decay, and when coupled with radiocarbon analyses will allow to calculate the C14/C12 ratio of the past water column.", "east": -35.0, "geometry": ["POINT(-52.75 -58)"], "keywords": "Biota; Corals; Drake Passage; Geochronology; NBP0805; Oceans; Paleoclimate; Radiocarbon; Southern Ocean", "locations": "Southern Ocean; Drake Passage", "north": -54.5, "nsf_funding_programs": null, "persons": "Robinson, Laura", "project_titles": "LGM and Deglacial Radiocarbon from U-series Dated Drake Passage Deep-sea Corals", "projects": [{"proj_uid": "p0000519", "repository": "USAP-DC", "title": "LGM and Deglacial Radiocarbon from U-series Dated Drake Passage Deep-sea Corals"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -61.5, "title": "LGM and Deglacial Radiocarbon from U-series Dated Drake Passage Deep-sea Corals", "uid": "600111", "west": -70.5}, {"awards": "0944474 Robinson, Laura", "bounds_geometry": ["POLYGON((-70.5 -54.5,-66.95 -54.5,-63.4 -54.5,-59.85 -54.5,-56.3 -54.5,-52.75 -54.5,-49.2 -54.5,-45.65 -54.5,-42.1 -54.5,-38.55 -54.5,-35 -54.5,-35 -55.2,-35 -55.9,-35 -56.6,-35 -57.3,-35 -58,-35 -58.7,-35 -59.4,-35 -60.1,-35 -60.8,-35 -61.5,-38.55 -61.5,-42.1 -61.5,-45.65 -61.5,-49.2 -61.5,-52.75 -61.5,-56.3 -61.5,-59.85 -61.5,-63.4 -61.5,-66.95 -61.5,-70.5 -61.5,-70.5 -60.8,-70.5 -60.1,-70.5 -59.4,-70.5 -58.7,-70.5 -58,-70.5 -57.3,-70.5 -56.6,-70.5 -55.9,-70.5 -55.2,-70.5 -54.5))"], "date_created": "Sat, 01 Jan 2011 00:00:00 GMT", "description": "Polar oceans are the main sites of deep-water formation and are critical to the exchange of heat and carbon between the deep ocean and the atmosphere. This award \"Historic perspectives on climate and biogeography from deep-sea corals in the Drake Passage\" will address the following specific research questions: What was the radiocarbon content of the Southern Ocean during the last glacial maximum and during past rapid climate change events? and What are the major controls on the past and present distribution of cold-water corals within the Drake Passage and adjacent continental shelves? Testing these overall questions will allow the researchers to better understand how processes in the Southern Ocean are linked to climate change over millennia. This award is being funded by the Antarctic Earth Sciences Program of NSF\u0027s Office of Polar Programs, Antarctic Division. INTELLECTUAL MERIT: The skeletons of deep-sea corals are abundant in the Southern Ocean, and can be dated using U-series techniques making them a useful archive of oceanographic history. By pairing U-series and radiocarbon analyses the awardees can reconstruct the radiocarbon content of seawater in the past, allowing them to address the research questions raised above. Collection of living deep-sea corals along with environmental data will allow them to address the broader biogeography questions posed above as well. The awardees are uniquely qualified to answer these questions in their respective labs via cutting edge technologies, and they have shown promising results from a preliminary pilot cruise to the area in 2008. BROADER IMPACTS: Societal Relevance: The proposed paleoclimate research will make significant advances toward constraining the Southern Ocean\u0027s influence on global climate, specifically it should help set the bounds for the upper limits on how fast the ocean circulation might change in this region of the world, which is of high societal relevance in this era of changing climate. Education and Outreach (E/O): These activities are grouped into four categories: i) increasing student participation in polar research by fully integrating undergraduate through post-doctoral students into research programs; ii) promotion of K-12 teaching and learning programs by providing information via a cruise website and in-school talks, iii) making the data collected available to the wider research community via data archives such as Seamounts Online and the Seamount Biogeographic Network and iv) reaching a larger public audience through such venues as interviews in the popular media.", "east": -35.0, "geometry": ["POINT(-52.75 -58)"], "keywords": "Biota; Corals; Cruise Report; Drake Passage; NBP1103; Oceans; Sample/collection Description; Sample/Collection Description; Southern Ocean", "locations": "Drake Passage; Southern Ocean", "north": -54.5, "nsf_funding_programs": null, "persons": "Robinson, Laura", "project_titles": "Collaborative Research: Historic Perspectives on Climate and Biogeography from Deep-sea Corals in the Drake Passage", "projects": [{"proj_uid": "p0000514", "repository": "USAP-DC", "title": "Collaborative Research: Historic Perspectives on Climate and Biogeography from Deep-sea Corals in the Drake Passage"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -61.5, "title": "Historic Perspectives on Climate and Biogeography from Deep-Sea Corals in the Drake Passage", "uid": "600114", "west": -70.5}, {"awards": "0125098 Emslie, Steven", "bounds_geometry": ["POLYGON((-50 -60,-29 -60,-8 -60,13 -60,34 -60,55 -60,76 -60,97 -60,118 -60,139 -60,160 -60,160 -63,160 -66,160 -69,160 -72,160 -75,160 -78,160 -81,160 -84,160 -87,160 -90,139 -90,118 -90,97 -90,76 -90,55 -90,34 -90,13 -90,-8 -90,-29 -90,-50 -90,-50 -87,-50 -84,-50 -81,-50 -78,-50 -75,-50 -72,-50 -69,-50 -66,-50 -63,-50 -60))"], "date_created": "Thu, 01 Jan 2009 00:00:00 GMT", "description": "This project will build on previous studies to investigate the occupation history and diet of Adelie penguins (Pygoscelis adeliae) in the Ross Sea region, Antarctica, with excavations of abandoned and active penguin colonies. Numerous active and abandoned colonies exist on the Victoria Land coast, from Cape Adare to Marble Point will be sampled. Some of these sites have been radiocarbon-dated and indicate a long occupation history for Adelie penguins extending to 13,000 years before present (B. P.). The material recovered from excavations, as demonstrated from previous investigations, will include penguin bones, tissue, and eggshell fragments as well as abundant remains of prey (fish bones, otoliths, squid beaks) preserved in ornithogenic (formed from bird guano) soils. These organic remains will be quantified and subjected to radiocarbon analyses to obtain a colonization history of penguins in this region. Identification of prey remains in the sediments will allow assessment of penguin diet. \n\nOther data (ancient DNA) from these sites will be analyzed through collaboration with New Zealand scientists. Past climatic conditions will be interpreted from published ice-core and marine-sediment records. These data will be used to test the hypothesis that Adelie penguins respond to climate change, past and present, in a predictable manner. In addition, the hypothesis that Adelie penguins alter their diet in accordance with climate, sea-ice conditions, and other marine environmental variables along a latitudinal gradient will be tested. Graduate and undergraduate students will be involved in this project and a project Web site will be developed to report results and maintain educational interaction between the PI and students at local middle and high schools in Wilmington, NC.", "east": 160.0, "geometry": ["POINT(55 -75)"], "keywords": "Antarctica; Biota; Geochronology; Oceans; Paleoclimate; Penguin; Radiocarbon; Ross Sea; Southern Ocean", "locations": "Antarctica; Ross Sea; Southern Ocean", "north": -60.0, "nsf_funding_programs": null, "persons": "Emslie, Steven D.", "project_titles": "Occupation History and Diet of Adelie Penguins in the Ross Sea Region", "projects": [{"proj_uid": "p0000220", "repository": "USAP-DC", "title": "Occupation History and Diet of Adelie Penguins in the Ross Sea Region"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -90.0, "title": "Occupation History and Diet of Adelie Penguins in the Ross Sea Region", "uid": "600028", "west": -50.0}]

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