We aim to collect six 100 meters long sediment cores along the Chilean Margin (36-46°S, 829-3858 m) to investigate links between oceanographic changes at the northern margin of the Antarctic Circumpolar Current and climate variability on the South American continent over one glacial-interglacial cycle and two terminations. The new cores will allow us to reconstruct surface and intermediate water variability at centennial-to-millennial resolution, which will extend available records from previous coring and drilling cruises to the region, thus allowing us to compare Southern Hemisphere records of the last and previous interglacial (Holocene vs. Eemian), terminations I and II, and the MIS 5e-5d glacial inception. The coring plan includes high-resolution pore water sampling to reconstruct the LGM density profile in the SE Pacific and multiple holes per site. We have assembled a group of researchers who are interested in participating in the cruise and applying their expertise to reconstruct changes in the intensity of the weathering cycle, land climate, and sediment provenance (e.g., using clay mineralogy, εNd, Hf-Nd isotopes, pollen).
Primary and alternate site locations plotted on maps of sea surface temperature and salinity (WOA13). Sites are ideally positioned within the low salinity plume to capture the intensity and northward extent of the freshwater inputs from the northern Patagonia icefield. Blue circles=Primary Site, Yellow circles=Primary, porewater only, white circles=alternate sites, Purple Stars=sites targeted on upcoming IODP Expedition 383
Primary and alternate site locations plotted on dissolved-oxygen cross-section of the Pacific Ocean along WOCE line P19 showing the main water masses intersected by the cores. The cores are strategically positioned to intersect all of the major water masses in the southeast Pacific.