USAP-DC

{"dp_type": "Dataset", "free_text": "noble gases"}

[{"awards": "1744993 Higgins, John", "bounds_geometry": null, "date_created": "Tue, 11 Feb 2025 00:00:00 GMT", "description": "Between about 2.8-0.9 Ma, Earth\u2019s climate was characterized by 40 kyr cycles, driven or paced by changes in the tilt of Earth\u2019s spin axis. Much is known about the 40k world from studies of deep-sea sediments, but our understanding of climate change during this period and the transition between the 40kyr glacial cycles from 2.8-0.9 Ma and the 100kyr glacial cycles of the last 0.9 Myr is incomplete because we lack records of Antarctic climate and direct records of atmospheric greenhouse gas concentrations. We propose to address these issues by building on our recent studies of \u003e1 Ma ice discovered in shallow ice cores in the Allan Hills Blue Ice Area (BIA), Antarctica. During the 2015-2016 field season we recovered ice from two nearby drill cores that dates to \u003e 2 million years in age using the 40Ar/38Ar ratio of the trapped gases. Our discovery of ice of this antiquity in two cores demonstrates that there is gas-record quality ice from the 40k world in the Allan Hills BIA. To further characterize the composition of Earth\u2019s atmosphere and Antarctic climate during the 40k world we request support for two field seasons to drill new large-volume (4\u201d or 9\u201d diameter) ice cores at sites where we have previously identified \u003e1 Ma ice and nearby sites where ground penetrating radar has identified bedrock features conducive to the preservation of old ice. ", "east": null, "geometry": null, "keywords": "Allan Hills; Antarctica; Cryosphere; Glaciers/ice Sheet; Glaciers/Ice Sheet; Glaciology; Ice Core Records; Noble Gas", "locations": "Allan Hills; Antarctica", "north": null, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Higgins, John", "project_titles": "Center for Oldest Ice Exploration; Collaborative research: Snapshots of Early and Mid-Pleistocene Climate and Atmospheric Composition from the Allan Hills Blue Ice Area ", "projects": [{"proj_uid": "p0010321", "repository": "USAP-DC", "title": "Center for Oldest Ice Exploration"}, {"proj_uid": "p0010253", "repository": "USAP-DC", "title": "Collaborative research: Snapshots of Early and Mid-Pleistocene Climate and Atmospheric Composition from the Allan Hills Blue Ice Area "}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": "Allan Hills", "south": null, "title": "Heavy noble gases (Ar/Xe/Kr) from ALHIC1901, 1902, and 1903", "uid": "601895", "west": null}, {"awards": "1341717 Ackley, Stephen; 1744562 Loose, Brice", "bounds_geometry": ["POLYGON((-180 -71,-179.9 -71,-179.8 -71,-179.7 -71,-179.6 -71,-179.5 -71,-179.4 -71,-179.3 -71,-179.2 -71,-179.1 -71,-179 -71,-179 -71.7,-179 -72.4,-179 -73.1,-179 -73.8,-179 -74.5,-179 -75.2,-179 -75.9,-179 -76.6,-179 -77.3,-179 -78,-179.1 -78,-179.2 -78,-179.3 -78,-179.4 -78,-179.5 -78,-179.6 -78,-179.7 -78,-179.8 -78,-179.9 -78,180 -78,177.5 -78,175 -78,172.5 -78,170 -78,167.5 -78,165 -78,162.5 -78,160 -78,157.5 -78,155 -78,155 -77.3,155 -76.6,155 -75.9,155 -75.2,155 -74.5,155 -73.8,155 -73.1,155 -72.4,155 -71.7,155 -71,157.5 -71,160 -71,162.5 -71,165 -71,167.5 -71,170 -71,172.5 -71,175 -71,177.5 -71,-180 -71))"], "date_created": "Thu, 15 Sep 2022 00:00:00 GMT", "description": "Discrete noble gases were collected by cold-welded copper tubes within the Amundsen and Ross Sea polynyas. ", "east": -179.0, "geometry": ["POINT(168 -74.5)"], "keywords": "Antarctica; Chemistry:fluid; Chemistry:Fluid; Mass Spectrometer; NBP1704; Noble Gas; Oceans; Ross Sea; R/v Nathaniel B. Palmer", "locations": "Antarctica; Ross Sea", "north": -71.0, "nsf_funding_programs": "Antarctic Integrated System Science; Antarctic Integrated System Science", "persons": "Loose, Brice", "project_titles": "Collaborative Research: Seasonal Sea Ice Production in the Ross Sea, Antarctica; Measuring Dissolved Gases to Reveal the Processes that Drive the Solubility Pump and Determine Gas Concentration in Antarctic Bottom Water", "projects": [{"proj_uid": "p0010032", "repository": "USAP-DC", "title": "Collaborative Research: Seasonal Sea Ice Production in the Ross Sea, Antarctica"}, {"proj_uid": "p0010376", "repository": "USAP-DC", "title": "Measuring Dissolved Gases to Reveal the Processes that Drive the Solubility Pump and Determine Gas Concentration in Antarctic Bottom Water"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -78.0, "title": "PIPERS Noble Gases", "uid": "601609", "west": 155.0}, {"awards": "1643664 Severinghaus, Jeffrey", "bounds_geometry": null, "date_created": "Tue, 16 Aug 2022 00:00:00 GMT", "description": "This data set consists of high-precision krypton and argon isotope measurements, along with 15N and 18O of O2. This data tests the hypothesis that the 2nd order parameter 86Krexcess (86Kr/82Kr - 40Ar/36Ar) serves as a proxy indicator of past storminess, via atmospheric pressure changes that cause barometric pumping in the firn and hence greater gravitational disequilibrium in the heavier Kr atom than in Ar. These measurements were made as part of the US-Australian Law Dome DE08-OH campaign in 2018-2019. Nitrogen and dioxygen isotopes were also measured.", "east": null, "geometry": null, "keywords": "Antarctica; Ice Core; Law Dome; Noble Gas", "locations": "Law Dome; Antarctica", "north": null, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Severinghaus, Jeffrey P.", "project_titles": "Collaborative Research: Reconstructing Carbon-14 of Atmospheric Carbon Monoxide from Law Dome, Antarctica to Constrain Long-Term Hydroxyl Radical Variability", "projects": [{"proj_uid": "p0010341", "repository": "USAP-DC", "title": "Collaborative Research: Reconstructing Carbon-14 of Atmospheric Carbon Monoxide from Law Dome, Antarctica to Constrain Long-Term Hydroxyl Radical Variability"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": null, "title": "Law Dome DE08-OH site noble gases in ice: testing the 86Krexcess proxy", "uid": "601597", "west": null}, {"awards": "1543453 Lyons, W. Berry", "bounds_geometry": ["POINT(-149.50134 -84.640287)"], "date_created": "Thu, 23 Dec 2021 00:00:00 GMT", "description": "This dataset includes the following measurements from Niskin casts at Mercer Subglacial Lake as part of the SALSA project: noble gases and their isotopes, d13C-DIC, Ge, 87Sr/86Sr, and 234U/238U", "east": -149.50134, "geometry": ["POINT(-149.50134 -84.640287)"], "keywords": "Antarctica; Mercer Subglacial Lake; Noble Gas", "locations": "Antarctica; Mercer Subglacial Lake", "north": -84.640287, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Gardner, Christopher B.; Lyons, W. Berry", "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 (SLM) noble gas and isotopic data", "uid": "601498", "west": -149.50134}, {"awards": "1443263 Higgins, John", "bounds_geometry": ["POINT(159.35507 -76.73286)"], "date_created": "Wed, 14 Aug 2019 00:00:00 GMT", "description": "This file includes argon isotope composition and xenon-to-krypton ratios measured in Allan Hills ice cores.", "east": 159.35507, "geometry": ["POINT(159.35507 -76.73286)"], "keywords": "Allan Hills; Allan Hills Project; Antarctica; Argon; Chemistry:ice; Chemistry:Ice; Glaciers/ice Sheet; Glaciers/Ice Sheet; Glaciology; Ice Core; Ice Core Data; Ice Core Gas Records; Krypton; Mass Spectrometer; Noble Gas; Snow/ice; Snow/Ice; Xenon", "locations": "Allan Hills; Antarctica", "north": -76.73286, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Yan, Yuzhen; Bender, Michael; Higgins, John; Ng, Jessica; Severinghaus, Jeffrey P.", "project_titles": "Collaborative Research: Window into the World with 40,000-year Glacial Cycles from Climate Records in Million Year-old Ice from the Allan Hills Blue Ice Area", "projects": [{"proj_uid": "p0000760", "repository": "USAP-DC", "title": "Collaborative Research: Window into the World with 40,000-year Glacial Cycles from Climate Records in Million Year-old Ice from the Allan Hills Blue Ice Area"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": "Allan Hills", "south": -76.73286, "title": "Elemental and isotopic composition of heavy noble gases in Allan Hills ice cores", "uid": "601201", "west": 159.35507}, {"awards": "1245821 Brook, Edward J.; 1246148 Severinghaus, Jeffrey; 1245659 Petrenko, Vasilii; 0739766 Brook, Edward J.", "bounds_geometry": ["POLYGON((161.68 -77.73,161.7 -77.73,161.72 -77.73,161.74 -77.73,161.76 -77.73,161.78 -77.73,161.8 -77.73,161.82 -77.73,161.84 -77.73,161.86 -77.73,161.88 -77.73,161.88 -77.734,161.88 -77.738,161.88 -77.742,161.88 -77.746,161.88 -77.75,161.88 -77.754,161.88 -77.758,161.88 -77.762,161.88 -77.766,161.88 -77.77,161.86 -77.77,161.84 -77.77,161.82 -77.77,161.8 -77.77,161.78 -77.77,161.76 -77.77,161.74 -77.77,161.72 -77.77,161.7 -77.77,161.68 -77.77,161.68 -77.766,161.68 -77.762,161.68 -77.758,161.68 -77.754,161.68 -77.75,161.68 -77.746,161.68 -77.742,161.68 -77.738,161.68 -77.734,161.68 -77.73))"], "date_created": "Tue, 23 Apr 2019 00:00:00 GMT", "description": "Noble gas data from Taylor Glacier for mean ocean temperature reconstruction during the Younger Dryas. Also includes field measurements of methane and standard deviations of replicate CO2 measurements from WAIS Divide. ", "east": 161.88, "geometry": ["POINT(161.78 -77.75)"], "keywords": "Antarctica; CO2; Glaciers/ice Sheet; Glaciers/Ice Sheet; Glaciology; Ice Core; Ice Core Records; Methane; Noble Gas; Noble Gas Isotopes; Snow/ice; Snow/Ice; Taylor Glacier; Younger Dryas", "locations": "Antarctica; Taylor Glacier", "north": -77.73, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Shackleton, Sarah", "project_titles": "Collaborative Research: The Taylor Glacier, Antarctica, Horizontal Ice Core: Exploring changes in the Natural Methane Budget in a Warming World and Expanding the Paleo-archive", "projects": [{"proj_uid": "p0000283", "repository": "USAP-DC", "title": "Collaborative Research: The Taylor Glacier, Antarctica, Horizontal Ice Core: Exploring changes in the Natural Methane Budget in a Warming World and Expanding the Paleo-archive"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": "Taylor Dome Ice Core", "south": -77.77, "title": "Taylor Glacier Noble Gases - Younger Dryas", "uid": "601176", "west": 161.68}, {"awards": "1245580 Castro, M. Clara", "bounds_geometry": ["POINT(163.1833 -77.6767)", "POINT(162.3667 -77.7166)"], "date_created": "Mon, 30 Jan 2017 00:00:00 GMT", "description": null, "east": 163.1833, "geometry": ["POINT(163.1833 -77.6767)", "POINT(162.3667 -77.7166)"], "keywords": "Antarctica; Atmosphere; Chemistry:fluid; Chemistry:Fluid; Critical Zone; Geochemistry; Noble Gas; Paleoclimate; Ross Ice Shelf; Ross Sea; Taylor Valley", "locations": "Antarctica; Ross Ice Shelf; Ross Sea; Taylor Valley", "north": -77.6767, "nsf_funding_programs": "Antarctic Earth Sciences", "persons": "Castro, M. Clara", "project_titles": "Developing a New Paleoclimate Proxy for Polar and Alpine Glacial Regions Based on Noble Gases", "projects": [{"proj_uid": "p0000388", "repository": "USAP-DC", "title": "Developing a New Paleoclimate Proxy for Polar and Alpine Glacial Regions Based on Noble Gases"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -77.7166, "title": "Developing a New Paleoclimate Proxy for Polar and Alpine Glacial Regions Based on Noble Gases", "uid": "600389", "west": 162.3667}]

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