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

使用 JR100 进行更深入的挖掘：将高分辨率古气候记录从智利边缘扩展到埃米亚

• 批准号: 1756241
• 负责人: Samantha Bova
• 金额: $ 49.77万
• 依托单位: Rutgers University New Brunswick
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-04-01 至 2022-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1756241&HistoricalAwards=false
• 关键词: Digging; Deeper; JR100; Extending; resolution

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.

东南太平洋是南半球最大的温带冰块--北巴塔哥尼亚冰原和南巴塔哥尼亚冰原--的所在地，相对于其他山脉冰川，这些冰块对现代海平面上升的贡献不成比例。巴塔哥尼亚冰场未来冰川融化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。该奖项资助了从大溪地到智利蓬塔阿雷纳斯为期一个月的研究探险，以收集东南太平洋沉积物岩芯的深度横断面。这些岩心将能够调查智利沿海水域的海洋变化和南美大陆过去140,000年来的气候变化。来自全国各地机构的26名科学家将参加，其中包括许多年轻的研究人员，重点是代表性不足的群体。该项目的主要目标是从智利边缘(36-46°S，829-3858米)采集6个长约100米的沉积物岩芯，以调查南极绕极洋流北缘的海洋变化与南美洲大陆在一个冰川-间冰期周期和两次冰川终止期间气候变化之间的联系。新的岩心将能够以百年至千年的分辨率重建地表和中层水的可变性，这将扩展以前取芯探险的现有记录，从而提供MIS5e-5d冰川开始的记录，并能够比较南半球上一次和前一次间冰期(全新世与伊米亚冰期)以及第一次和第二次冰川终止的记录。这次探险将包括高分辨率的孔隙水分析，以重建东南太平洋大冰川的海水密度剖面。将在海上扫描岩芯，以最大限度地进行船上数据分析。巡航后的X射线荧光(XRF)扫描将用于验证最初的舰载拼接。该项目还包括利用浮游和底栖有孔虫的18O和镁/钙测量，在巡航后生成六个地点中两个地点的高分辨率海面和中等水温记录。BA/Ca和ND/Ca数据将被用来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。这一奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Deep submarine infiltration of altered geothermal groundwater on the south Chilean Margin

智利南缘改变的地热地下水深部海底渗透

• DOI: 10.1038/s43247-022-00541-3
• 发表时间: 2022
• 期刊: Communications Earth & Environment
• 影响因子: 7.9
• 作者: Clementi, Vincent J.;Rosenthal, Yair;Bova, Samantha C.;Thomas, Elizabeth K.;Wright, James D.;Mortlock, Richard A.;Cowling, Owen C.;Godfrey, Linda V.;Childress, Laurel B.;Aiello, Ivano W.
• 通讯作者: Aiello, Ivano W.

The Sediment Green‐Blue Color Ratio as a Proxy for Biogenic Silica Productivity Along the Chilean Margin

• DOI: 10.1029/2022gc010350
• 发表时间: 2022-01
• 期刊: Geochemistry
• 影响因子: 3.7
• 作者: Chen Li;V. Clementi;S. Bova;Y. Rosenthal;L. Childress;J. Wright;Z. Jian