Digging Deeper with the JR100: Extending high resolution paleoclimate records from the Chilean Margin to the Eemian

东南太平洋是南半球最大的温带冰群，巴塔哥尼亚北部和南部冰原的所在地，相对于其他山地冰川，它们对现代海平面上升的贡献不成比例。巴塔哥尼亚冰原未来的冰损失对气候的影响仍不确定，但预计将导致南半球这一地区的显著变化，可能对海洋环流、海平面上升和全球气候产生影响。该奖项资助了一个为期一个月的研究考察，从塔希提岛到智利的蓬塔阿雷纳斯，从东南太平洋收集沉积物岩心的深度样带。这些岩心将有助于研究过去14万年来智利沿海水域的海洋学变化和南美大陆的气候变化。来自全国各机构的26名科学家将参加，其中包括许多年轻的研究人员，重点关注未被充分代表的群体。该项目的主要目标是从智利边缘（36-46°S, 829-3858 m）收集6个~100米长的沉积物岩心，以研究南极环极流北缘的海洋变化与南美大陆在一个冰期-间冰期旋回和两个冰期终止期间的气候变化之间的联系。新的岩心将能够在百年至千年的分辨率上重建地表和中间水的变化，这将扩展以前的岩心考察的可用记录，从而提供MIS 5e-5d冰川开始的记录，并允许比较南半球最后一次和以前的间冰期记录（全新世与埃米世）以及冰川终止I和II。这次考察将包括高分辨率孔隙水分析，以重建东南太平洋LGM海水密度剖面。岩心将在海上进行扫描，以最大限度地进行船上数据分析。巡航后的x射线荧光（XRF）扫描将用于验证初始船载拼接。该项目还涉及在巡航后生成高分辨率海面和中间水温记录，这些记录来自六个地点中的两个，使用&amp；#61540；浮游和底栖有孔虫中18O和Mg/Ca的测定。Ba/Ca和Nd/Ca数据将用于追踪沿海地区河流输入的变化，作为重建巴塔哥尼亚冰川变化的手段。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

The southeast Pacific is home to the largest temperate ice masses in the Southern Hemisphere, the Northern and Southern Patagonia Icefields, which contribute a disproportionate amount to modern sea level rise relative to other mountain glaciers. The climate impacts of future ice loss from the Patagonia icefield remain uncertain, but are expected to lead to significant variations in this region of the southern hemisphere with likely impacts to ocean circulation, sea level rise, and the global climate. This award funds a month-long research expedition from Tahiti to Punta Arenas, Chile to collect a depth transect of sediment cores from the southeast Pacific. The cores will enable investigation of oceanographic change in Chilean coastal waters and climate variability on the South American continent over the last 140,000 years. Twenty-six scientists from institutions across the country will participate, including many young investigators, with an emphasis on underrepresented groups. The primary goal of the project is to collect six, ~100 meters long sediment cores from 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 glacial terminations. The new cores will enable reconstruction of surface and intermediate water variability at centennial-to-millennial resolution, which will extend available records from previous coring expeditions, thus providing a record of the MIS 5e-5d glacial inception and permitting comparison of Southern Hemisphere records of the last and previous interglacial (Holocene vs. Eemian) as well as glacial terminations I and II. The expedition will include high-resolution pore water analysis to reconstruct the LGM seawater density profile in the Southeast Pacific. Cores will be scanned at sea to maximize shipboard data analysis. Post-cruise x-ray fluorescence (XRF) scanning will be used to verify the initial shipboard splices. The project also involves post-cruise generation of high-resolution sea surface and intermediate water temperature records from two of the six sites using 18O and Mg/Ca measurements in planktonic and benthic foraminifera. Ba/Ca and Nd/Ca data will be used to trace changes in river inputs to the coastal region as means of reconstructing changes in the Patagonian glaciers.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.