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We will also address interhemispheric phasing of ice sheet growth and decay, study the distribution and history of land-based versus marine-based ice sheets around the continent over time, and explore the links between AIS variability and global sea level.īy comparing north–south variations across the Scotia Sea between the Pirie Basin (Site U1538) and the Dove Basin (Sites U1536 and U1537), Expedition 382 will also deliver critical information on how climate changes in the Southern Ocean affect ocean circulation through the Drake Passage, meridional overturning in the region, water mass production, ocean–atmosphere CO 2 transfer by wind-induced upwelling, sea ice variability, bottom water outflow from the Weddell Sea, Antarctic weathering inputs, and changes in oceanic and atmospheric fronts in the vicinity of the ACC.Ĭomparing changes in dust proxy records between the Scotia Sea and Antarctic ice cores will also provide a detailed reconstruction of changes in the Southern Hemisphere westerlies on millennial and orbital timescales for the last 800 ky.
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We will use the geochemical provenance of iceberg-rafted detritus and other glacially eroded material to determine regional sources of AIS mass loss. The “warm interglacials” and glacial terminations of the last 800 ky.The mid-Pleistocene transition (MPT), and.The late Pliocene glacial expansion of the West Antarctic Ice Sheet,.The middle Miocene glacial intensification of the East Antarctic Ice Sheet,.In particular, sediments from this area will allow us to assess the magnitude of iceberg flux during key times of AIS evolution, including the following: The sites from the southern Scotia Sea (Sites U1536–U1538) will be used to study the Neogene flux of icebergs through “Iceberg Alley,” the main pathway along which icebergs calved from the margin of the AIS travel as they move equatorward into the warmer waters of the Antarctic Circumpolar Current (ACC). We recovered continuously deposited late Neogene sediments to reconstruct the past history and variability in Antarctic Ice Sheet (AIS) mass loss and associated changes in oceanic and atmospheric circulation. Five sites (U1534–U1538) were drilled east of the Drake Passage: two sites at 53.2°S at the northern edge of the Scotia Sea and three sites at 57.4°–59.4°S in the southern Scotia Sea. International Ocean Discovery Program Expedition 382, Iceberg Alley and Subantarctic Ice and Ocean Dynamics, investigated the long-term climate history of Antarctica, seeking to understand how polar ice sheets responded to changes in insolation and atmospheric CO 2 in the past and how ice sheet evolution influenced global sea level and vice versa. Keywords: International Ocean Discovery Program, IODP, JOIDES Resolution, Expedition 382, Iceberg Alley and Subantarctic Ice and Ocean Dynamics, Site U1534, Site U1535, Site U1536, Site U1537, Site U1538, Subantarctic Front, Pirie Basin, Dove Basin, Scotia Sea, Weddell Sea, sea ice, Antarctica, Antarctic Ice Sheet, sea level, ice-rafted debris, ice-rafted detritus, iceberg-rafted debris, iceberg, provenance, contourites, Weddell Sea Deep Water, Antarctic Circumpolar Current, Southern Hemisphere westerly winds, paleoceanography, paleoclimatology, mid-Pleistocene transition, Pliocene, interglacial climate, marine isotope stage, MIS 5, MIS 11