USAP-DC

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

[{"awards": "0732554 Ishman, Scott", "bounds_geometry": ["POLYGON((-64.76 -65.75,-64.759 -65.75,-64.75800000000001 -65.75,-64.757 -65.75,-64.756 -65.75,-64.755 -65.75,-64.754 -65.75,-64.753 -65.75,-64.752 -65.75,-64.751 -65.75,-64.75 -65.75,-64.75 -65.751,-64.75 -65.752,-64.75 -65.753,-64.75 -65.754,-64.75 -65.755,-64.75 -65.756,-64.75 -65.757,-64.75 -65.75800000000001,-64.75 -65.759,-64.75 -65.76,-64.751 -65.76,-64.752 -65.76,-64.753 -65.76,-64.754 -65.76,-64.755 -65.76,-64.756 -65.76,-64.757 -65.76,-64.75800000000001 -65.76,-64.759 -65.76,-64.76 -65.76,-64.76 -65.759,-64.76 -65.75800000000001,-64.76 -65.757,-64.76 -65.756,-64.76 -65.755,-64.76 -65.754,-64.76 -65.753,-64.76 -65.752,-64.76 -65.751,-64.76 -65.75))"], "date_created": "Fri, 12 Dec 2025 00:00:00 GMT", "description": "The foraminiferal data presented here are from marine sediment core samples collected on the 2010 LARISSA cruise \u2013 NBP1001. The location of the 2 cores, NBP1001 JKC55 and JPC127, is outer Barilari Bay, western Antarctic Peninsula. The cores were paired, a shorter jumbo kasten core and a longer jumbo piston core. These data were generated by Ilona Matulaitis, under the direction of Scott Ishman (sishman@ku.edu), Kansas Geological Survey. All questions regarding the specifics of these data should be directed to Scott Ishman.\r\n\u003cbr/\u003e\r\n\u003cbr/\u003eName Latitude Longitude Water depth (m) Core length (m)\r\n\u003cbr/\u003eNBP1001 JKC55 65\u00ba45.38\u00baS 64\u00ba45.64\u00baW 652 4.26\r\n\u003cbr/\u003eNBP1001 JPC127 65\u00ba45.36\u00baS 64\u00ba45.64\u00baW 653 8.68\r\n\u003cbr/\u003e\r\n\u003cbr/\u003eTwo published papers describe these cores and present the radiocarbon-based chronology:\r\n\u003cbr/\u003e\r\n\u003cbr/\u003eChrist, A., Talaia-Murray, M., Domack, E., Leventer, A., Lavoie, C., Brachfeld, S., Yoo, K.-C., Gilbert, R., Jeong, S.-M., Wellner, J., 2014. Late Holocene glacial advance and ice shelf growth in Barilari Bay, Graham Land, West Antarctic Peninsula, Geological Society of America Bulletin, doi:10.1130/B31035.1.\r\n\u003cbr/\u003e\r\n\u003cbr/\u003eReilly, B.T., Natter, C.J., Brachfeld, S.A., 2016. Holocene glacial activity in Barilari Bay, west Antarctic Peninsula, tracked by magnetic mineral assemblages: Linking ice, ocean, and atmosphere, Geochem. Geophys. Geosyst., 17, 4553\u20134565, doi:10.1002/2016GC006627.\r\n\u003cbr/\u003e\r\n\u003cbr/\u003eThe marine sediment samples collected for assemblage analysis were washed through a\r\n\u003cbr/\u003e63 micron sieve in order to retain foraminifera. The \u003e63 micron sample residue was dried then picked through for foraminifera using a reflected light binocular stereomicroscope, to obtain at least 300 specimens per sample to ensure that full diversity within each sample was accounted for (Dennison and Hay, 1967). The picked foraminifera were identified to the species level, using the taxonomic concepts of Igarashi et al., 2001 and Echols, 1971.\r\n\u003cbr/\u003e\r\n\u003cbr/\u003eDennison J.M., and Hay W.W., 1967, Estimating the needed sampling area for subaquatic ecologic studies. Journal of Paleontology, v. 41, p. 706-708.\r\n\u003cbr/\u003eEchols, R.J., 1971, Distribution of foraminifera in sediments of the Scotia Sea area, Antarctic Waters, Antarctic Oceanology I, Antarctic Research Series, v. 15, p. 93-168.\r\n\u003cbr/\u003eIgarashi, A., Numanami, H., Tsuchiya, Y., and Fukuchi, M., 2001, Bathymetric distribution of fossil foraminifera within marine sediment cores from the eastern part of L\u00fctzow-Holm Bay, East Antarctica, and its paleoceanographic implications, Marine Micropaleontology, v. 42, p. 125-162.\r\n\u003cbr/\u003e\r\n\u003cbr/\u003e\r\n\u003cbr/\u003e\r\n\u003cbr/\u003e", "east": -64.75, "geometry": ["POINT(-64.755 -65.755)"], "keywords": "Antarctica; Antarctic Peninsula; Cryosphere; Foraminifera; Holocene; NBP1001; Paleoclimate; Sediment Corer; Sedimentology", "locations": "Antarctica; Antarctic Peninsula", "north": -65.75, "nsf_funding_programs": "Antarctic Integrated System Science", "persons": "Ishman, Scott", "project_titles": "Collaborative Research in IPY: Abrupt Environmental Change in the Larsen Ice Shelf System, a Multidisciplinary Approach - Marine Ecosystems.", "projects": [{"proj_uid": "p0010135", "repository": "USAP-DC", "title": "Collaborative Research in IPY: Abrupt Environmental Change in the Larsen Ice Shelf System, a Multidisciplinary Approach - Marine Ecosystems."}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": "LARISSA", "south": -65.76, "title": "Quantitative Foraminiferal Assemblage Data from Barilari Bay, Antarctic Peninsula acquired during expedition NBP1001", "uid": "602000", "west": -64.76}, {"awards": "0732625 Leventer, Amy", "bounds_geometry": ["POLYGON((-64.76 -65.75,-64.759 -65.75,-64.75800000000001 -65.75,-64.757 -65.75,-64.756 -65.75,-64.755 -65.75,-64.754 -65.75,-64.753 -65.75,-64.752 -65.75,-64.751 -65.75,-64.75 -65.75,-64.75 -65.751,-64.75 -65.752,-64.75 -65.753,-64.75 -65.754,-64.75 -65.755,-64.75 -65.756,-64.75 -65.757,-64.75 -65.75800000000001,-64.75 -65.759,-64.75 -65.76,-64.751 -65.76,-64.752 -65.76,-64.753 -65.76,-64.754 -65.76,-64.755 -65.76,-64.756 -65.76,-64.757 -65.76,-64.75800000000001 -65.76,-64.759 -65.76,-64.76 -65.76,-64.76 -65.759,-64.76 -65.75800000000001,-64.76 -65.757,-64.76 -65.756,-64.76 -65.755,-64.76 -65.754,-64.76 -65.753,-64.76 -65.752,-64.76 -65.751,-64.76 -65.75))"], "date_created": "Wed, 12 Nov 2025 00:00:00 GMT", "description": "The diatom data presented here are from marine sediment core samples collected on the 2010 LARISSA cruise \u2013 NBP1001. The location of the 2 cores, NBP1001 JKC55 and JPC127, is outer Barilari Bay, western Antarctic Peninsula. The cores were paired, a shorter jumbo kasten core and a longer jumbo piston core. These data were generated by Sunmi Jeong, under the direction of Amy Leventer (aleventer@colgate.edu), Department of Earth and Environmental Geosciences, Colgate University. All questions regarding the specifics of these data should be directed to Amy Leventer.\r\n\u003cbr/\u003e\r\n\u003cbr/\u003eName\tLatitude\tLongitude\tWater depth (m)\tCore length (m)\r\n\u003cbr/\u003eNBP1001 JKC55\t65\u00ba45.38\u00baS\t64\u00ba45.64\u00baW\t652\t4.26\r\n\u003cbr/\u003eNBP1001 JPC127\t65\u00ba45.36\u00baS\t64\u00ba45.64\u00baW\t653\t8.68\r\n\u003cbr/\u003e\r\n\u003cbr/\u003eTwo published papers describe these cores and present the radiocarbon-based chronology:\r\n\u003cbr/\u003e\r\n\u003cbr/\u003eChrist, A., Talaia-Murray, M., Domack, E., Leventer, A., Lavoie, C., Brachfeld, S., Yoo, K.-C., Gilbert, R., Jeong, S.-M., Wellner, J., 2014. Late Holocene glacial advance and ice shelf growth in Barilari Bay, Graham Land, West Antarctic Peninsula, Geological Society of America Bulletin, doi:10.1130/B31035.1.\r\n\u003cbr/\u003e\r\n\u003cbr/\u003eReilly, B.T., Natter, C.J., Brachfeld, S.A., 2016. Holocene glacial activity in Barilari Bay, west Antarctic Peninsula, tracked by magnetic mineral assemblages: Linking ice, ocean, and atmosphere, Geochem. Geophys. Geosyst., 17, 4553\u20134565, doi:10.1002/2016GC006627.\r\n\u003cbr/\u003e\r\n\u003cbr/\u003eIn the Micropaleontology lab at Colgate University, about 10-100 mg of sediment were weighed to the tenth of a mg and placed in 20 ml glass vials. Vials were placed on a warming tray set to 50 degrees C and 1 mL of hydrogen peroxide was added to each vial, followed by RH2O. This was done to oxidize organic material. Successive additions of 1 mL of hydrogen peroxide were done until samples had stopped reacting. RH2O was added as needed to avoid samples drying out. Slides then were made using the random settling and slide preparation methods in Scherer (1994).\r\n\u003cbr/\u003e\r\n\u003cbr/\u003eDiatoms were observed with an Olympus BX50 microscope using the 100x/1.30 oil immersion objective and 10x eyepieces, for a total magnification of 1000x. For each slide, at least 400 diatom valves were counted along non-overlapping transects. Valves were only counted if \u003e50% complete, and diatoms were identified to the species level when possible, using identifications from Johansen and Fryxell (1985), Priddle and Fryxell (1985), Cremer et al. (2003), and Cefarelli et al. (2010). Unidentified diatoms were placed in either the unidentified centric diatom or unidentified pennate diatom category.\r\n\u003cbr/\u003e\r\n\u003cbr/\u003eCefarelli, A., Ferrario, M., Almandoz, G., Atencio, A., Akselman, R. \u0026 Vernet, M. (2010). Diversity of the diatom genus Fragilariopsis in the Argentine Sea and Antarctic waters: Morphology, distribution and abundance. Polar Biology, 33. 10.1007/s00300-010-0794-z.\r\n\u003cbr/\u003e\r\n\u003cbr/\u003eCremer, H., Roberts, D., McMinn, A., Gore, D. \u0026 Melles, M. (2003). The Holocene Diatom Flora of Marine Bays in the Windmill Islands, East Antarctica. Botanica Marina, 46(1), 82-106. https://doi.org/10.1515/BOT.2003.010\r\n\u003cbr/\u003e\r\n\u003cbr/\u003eJohansen, Jeffrey R.; Fryxell, Greta A. (1985). The genus Thalassiosira (Bacillariophyceae): studies on species occurring south of the Antarctic Convergence Zone. Phycologia, 24 (2). 155-179. 10.2216/i0031-8884-24-2-155.1\r\n\u003cbr/\u003e\r\n\u003cbr/\u003ePriddle, J.; Fryxell, G. (1985). Handbook of the common plankton diatoms of the Southern Ocean: Centrales except the genus Thalassiosira. Cambridge, British Antarctic Survey, 159pp.\r\n\u003cbr/\u003e\r\n\u003cbr/\u003eScherer, R.P. (1994) A new method for the determination of absolute abundance of diatoms and other silt-sized sedimentary particles. J Paleolimnology, 12, 171\u2013179. https://doi.org/10.1007/BF00678093\r\n\u003cbr/\u003e", "east": -64.75, "geometry": ["POINT(-64.755 -65.755)"], "keywords": "Antarctica; Antarctic Peninsula; Cryosphere; Holocene; Jumbo Piston Corer; Paleoclimate", "locations": "Antarctica; Antarctic Peninsula", "north": -65.75, "nsf_funding_programs": "Antarctic Integrated System Science", "persons": "Leventer, Amy", "project_titles": "Collaborative Research in IPY: Abrupt Environmental Change in the Larsen Ice Shelf System, a Multidisciplinary Approach -- Cryosphere and Oceans", "projects": [{"proj_uid": "p0000101", "repository": "USAP-DC", "title": "Collaborative Research in IPY: Abrupt Environmental Change in the Larsen Ice Shelf System, a Multidisciplinary Approach -- Cryosphere and Oceans"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": "LARISSA", "south": -65.76, "title": "Quantitative Diatom Assemblage Data from Barilari Bay, Antarctic Peninsula acquired during expedition NBP1001", "uid": "601995", "west": -64.76}, {"awards": "1744871 Robinson, Rebecca", "bounds_geometry": ["POINT(-64.207 -64.86)"], "date_created": "Wed, 24 Apr 2024 00:00:00 GMT", "description": "This dataset includes measurements of opal (wt %), total organic carbon (wt %), total nitrogen (wt%), bulk nitrogen isotopic composition (d15Nbulk; \u2030 vs air), and diatom-bound nitrogen isotopic composition (d15Ndb; \u2030 vs air) from 36 samples from ODP sediment core 1098B-5H-7 on the western Antarctic Peninsula. The sediments were deposited during a period of deglaciation about 12.5-12.3 ka.", "east": -64.207, "geometry": ["POINT(-64.207 -64.86)"], "keywords": "Antarctica; Antarctic Peninsula; Cryosphere", "locations": "Antarctica; Antarctic Peninsula", "north": -64.86, "nsf_funding_programs": "Antarctic Earth Sciences", "persons": "Dove, Isabel", "project_titles": "The nitrogen isotopic composition of diatom resting spores in Southern Ocean sediments: A source of bias and/or paleoenvironmental information?", "projects": [{"proj_uid": "p0010234", "repository": "USAP-DC", "title": "The nitrogen isotopic composition of diatom resting spores in Southern Ocean sediments: A source of bias and/or paleoenvironmental information?"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -64.86, "title": "Sediment chemistry of ODP Site 1098", "uid": "601778", "west": -64.207}, {"awards": "2042495 Blackburn, Terrence", "bounds_geometry": null, "date_created": "Wed, 10 Aug 2022 00:00:00 GMT", "description": "This file includes U-series isotopic and 234U/230Th chronologic data from two chemical precipitates deposited beneath the Antarctic Ice Sheet. Precipitate mineral compositions consist of opal and calcite layers. Sample MA113 was found at Mount Achernar moraine (84.2\u00b0S, 161\u00b0E), and sample PRR50489 was found at Elephant Moraine (76.3\u00b0S, 157.3\u00b0E).", "east": null, "geometry": null, "keywords": "Antarctica; East Antarctica", "locations": "East Antarctica; Antarctica", "north": null, "nsf_funding_programs": "Antarctic Earth Sciences", "persons": "Piccione, Gavin; Blackburn, Terrence", "project_titles": "Collaborative Research: Reconstructing East Antarctica\u2019s Past Response to Climate using Subglacial Precipitates", "projects": [{"proj_uid": "p0010192", "repository": "USAP-DC", "title": "Collaborative Research: Reconstructing East Antarctica\u2019s Past Response to Climate using Subglacial Precipitates"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": null, "title": "Subglacial Precipitates Record Antarctic Ice Sheet Response to Pleistocene Millennial Climate Cycles", "uid": "601594", "west": null}, {"awards": "0839107 Powell, Ross", "bounds_geometry": ["POLYGON((-163.7 -84,-163.68 -84,-163.66 -84,-163.64 -84,-163.62 -84,-163.6 -84,-163.58 -84,-163.56 -84,-163.54 -84,-163.52 -84,-163.5 -84,-163.5 -84.05,-163.5 -84.1,-163.5 -84.15,-163.5 -84.2,-163.5 -84.25,-163.5 -84.3,-163.5 -84.35,-163.5 -84.4,-163.5 -84.45,-163.5 -84.5,-163.52 -84.5,-163.54 -84.5,-163.56 -84.5,-163.58 -84.5,-163.6 -84.5,-163.62 -84.5,-163.64 -84.5,-163.66 -84.5,-163.68 -84.5,-163.7 -84.5,-163.7 -84.45,-163.7 -84.4,-163.7 -84.35,-163.7 -84.3,-163.7 -84.25,-163.7 -84.2,-163.7 -84.15,-163.7 -84.1,-163.7 -84.05,-163.7 -84))"], "date_created": "Fri, 01 Jan 2016 00:00:00 GMT", "description": "The RAGES project (Robotic Access to Grounding zones for Exploration and Science) is one of three research components of the WISSARD (Whillans Ice Stream Subglacial Access Research Drilling) integrative initiative that is being funded by the Antarctic Integrated System Science Program of NSF\u0027s Office of Polar Programs, Antarctic Division. The overarching scientific objective of WISSARD is to assess the role of water beneath a West Antarctic ice stream in interlinked glaciological, geological, microbiological, geochemical, and oceanographic systems. The RAGES component of WISSARD concentrates on the stability of ice stream grounding zones (GZ), the area where the ice, ocean waters and glacial and sea floor sediment interact. Based on our present limited data and modeling efforts, GZs can be perturbed by (i) internal ice stream dynamics, (ii) filling/draining cycles of subglacial lakes, (iii) increased melting by warming ocean waters, and/or (iv) rates of subglacial sediment (till) supply to the GZ. GZs are seen as high priority targets to investigate due to their unknown contributions to ice sheet stability under future global warming scenarios. The three main science goals for RAGES are to assess: (a) West Antarctic Ice Sheet (WAIS) stability relative to the magnitudes of the four main variables listed above; (b) the degree to which grounding-zone sedimentary systems house important records of past WAIS dynamics; and (c) the importance of microbial activity and subglacial geochemical weathering in supplying nutrients to the WAIS grounding zone, the Ross Ice Shelf (RIS) cavity, and the highly productive Southern Ocean that may ultimately influence global biogeochemical cycles. The RAGES field sampling plan integrates surface geophysical surveys with borehole and subglacial sampling and measurements. The boreholes provide: (1) samples of subglacial water, sediments, and basal ice for biological, geochemical, glaciological, sedimentological, and micropaleontological analyses; (2) measures of subglacial and sub-ice-shelf cavity physical and chemical conditions and their spatial variability; and (3) data on sediment types, state and change of the subglacial water discharge, oceanography, and basal ice at the grounding line and within the nearby sub-ice-shelf cavity. Unique tools to be deployed include a multisensor Sub-Ice ROVer (Remotely Operated Vehicle) and long-term, sub-ice oceanographic moorings.\nThe latest report of the Intergovernmental Panel on Climate Change recognized that the greatest uncertainties in assessing future global sea-level change stem from a poor understanding of ice sheet dynamics and ice sheet vulnerability to oceanic and atmospheric warming. Disintegration of the WAIS (West Antarctic Ice Sheet) alone would contribute 3-5 m to global sea-level rise, making WAIS a focus of scientific concern due to its potential susceptibility to internal or ocean-driven instability. The overall WISSARD project will test the overarching hypothesis that active water drainage connects various subglacial environments and exerts major control on ice sheet flow, geochemistry, metabolic and phylogenetic diversity, and biogeochemical transformations.\nSocietal Relevance: Global warming, melting of ice sheets and consequential sea-level rise are of high societal relevance. Science Resource Development: After a 9-year hiatus WISSARD will provide the US-science community with a renewed capability to access and study sub-ice sheet environments. Developing this technological infrastructure will benefit the broader science community and assets will be accessible for future use through the NSF-OPP drilling contractor. The RAGES project represents a significant advance in polar technology by incorporating the use of complex new instrumentation like the Sub-Ice ROVer and subglacial ocean/lake mooring systems. Furthermore, these projects will pioneer an approach implementing recommendations from the National Research Council committee on Principles of Environmental Stewardship for the Exploration and Study of Subglacial Environments (2007). Education and Outreach (E/O): These activities are grouped into four categories: i) increasing student participation in polar research by fully integrating them in our research programs; ii) introducing new investigators to the polar sciences by incorporating promising young investigators in our programs, iii) promotion of K-12 teaching and learning programs by incorporating various teachers and NSTA programs, and iv) reaching a larger public audience through such venues as popular science magazines, museum based activities and videography and documentary films. In summary, WISSARD will promote scientific exploration of Antarctica by conveying to the public the excitement of accessing and studying what may be some of the last unexplored aquatic environments on Earth, and which represent a potential analogue for extraterrestrial life habitats on Europa and Mars.", "east": -163.5, "geometry": ["POINT(-163.6 -84.25)"], "keywords": "Antarctica; Glaciology; Oceans; Southern Ocean; WISSARD", "locations": "Antarctica; Southern Ocean", "north": -84.0, "nsf_funding_programs": null, "persons": "Powell, Ross", "project_titles": "Collaborative Research: Integrative Study of Marine Ice Sheet Stability \u0026 Subglacial Life Habitats in W Antarctica - Lake \u0026 Ice Stream Subglacial Access Research Drilling (LISSARD)", "projects": [{"proj_uid": "p0000105", "repository": "USAP-DC", "title": "Collaborative Research: Integrative Study of Marine Ice Sheet Stability \u0026 Subglacial Life Habitats in W Antarctica - Lake \u0026 Ice Stream Subglacial Access Research Drilling (LISSARD)"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -84.5, "title": "Integrative Study of Marine Ice Sheet Stability and Subglacial Life Habitats - Robotic Access to Grounding-zones for Exploration and Science (RAGES)", "uid": "600155", "west": -163.7}]

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