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的所在地，即北部和南部巴塔哥尼亚冰原，与其他山区冰川相比，这些冰原对现代海平面上升的贡献不成比例。巴塔哥尼亚冰原未来冰损失的气候影响。仍然不确定，但预计将导致南半球该地区发生重大变化，可能对海洋环流、海平面上升和全球气候产生影响。该奖项资助从塔希提岛到全球气候的为期一个月的研究考察。智利蓬塔阿雷纳斯收集东南太平洋沉积物岩心的深度横断面，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变化和南美大陆的气候变化。该项目的主要目标是从智利边缘收集六个约 100 米长的沉积岩芯。 （36-46°S，829-3858 m）将研究南极绕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。能够以百年到千年的分辨率重建地表水和中间水的变化，这将扩展以前取芯探险的可用记录，从而提供 MIS 5e-5d 的记录此次考察将包括高分辨率孔隙水分析，以重建东南部末次冰川期海水密度剖面。太平洋核心将在海上进行扫描，以最大限度地进行船上数据分析，该项目还包括使用 X 射线荧光 (XRF) 扫描来验证最初的船上接头。巡航后，利用浮游和底栖有孔虫 Ba/Ca 和 Nd/Ca 数据的 18O 和 Mg/Ca 测量结果，从六个地点中的两个地点生成高分辨率海面和中间水温记录。追踪河流流入沿海地区的变化，作为重建巴塔哥尼亚冰川变化的手段。该奖项反映了 NSF 的法定使命，并通过使用基金会的评估进行评估，认为值得支持智力价值和更广泛的影响审查标准。

项目成果

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

沉积物绿蓝比作为智利边缘生物二氧化硅生产力的代表

• DOI: 10.1029/2022gc010350
• 发表时间: 2022-01-21
• 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
• 通讯作者: Z. Jian

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: 2022-12
• 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.;et al
• 通讯作者: et al