USAP-DC

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Using Radiochemical Data from Collapsed Ice Shelf Sediments to Understand the Nature and Timing of the Benthic Response to High-Latitude Climate Change Start Date: 2013-10-01 End Date: 2017-09-30 Program: LARISSA Description/Abstract The PI requests support to analyze sediments from multi-cores and mega-cores previously collected from beneath the former Larsen B and Larsen A ice shelves. These unique cores will allow the PI to develop a time-integrated understanding of the benthic response to ice shelf collapse off the East Antarctic Peninsula over time periods as short as 5 years following ice shelf collapse up to >170 years after collapse. High latitudes are responding to climate change more rapidly than the rest of the planet and the disappearance of ice shelves are a key manifestation of climate warming. The PI will investigate the newly created benthic environments and associated ecosystems that have resulted from the re-initiation of fresh planktonic material to the sediment-water interface. This proposal will use a new geochemical technique, based on naturally occurring 14C that can be used to assess the distribution and inventory of recently produced organic carbon accumulating in the sediments beneath the former Larsen A and B ice shelves. The PI will couple 14C measurements with 210Pb analyses to assess turnover times for sedimentary labile organic matter. By comparing the distributions and inventories of labile organic matter as well as the bioturbation intensities among different locations as a function of time following ice shelf collapse/retreat, the nature and timing of the benthic response to ice shelf collapse can be assessed. Personnel Person Role DeMaster, David Investigator Smith, Craig Co-Investigator Funding Antarctic Earth Sciences Award # 1341669 Antarctic Instrumentation and Support Award # 1341669 AMD - DIF Record(s) USAP-1341669_1 Data Management Plan None in the Database Product Level: 1 (processed data) Datasets Repository Title (link) Format(s) Status R2R Expedition Data of NBP1203 None exist USAP-DC DeMaster Compiled Larsen Ice Shelf and the West Antarctic Peninsula C14 Data None exist USAP-DC Species Abundance Data from the Larsen Ice Shelf Ice acquired during R/V Nathaniel B. Palmer expedition NBP1203 None exists USAP-DC Labile Organic Carbon distributions on the West Antarctic Peninsula Shelf Excel exists USAP-DC Radioisotope data (C-14 and Pb-210) from bulk sediments, Larsen A Ice Shelf Excel exists Keywords C-14 Labile Organic Carbon NBP1203 Pb-210 Radioisotop Species Abundance Platforms and Instruments LABORATORY R/V NBP