When the Earth Warms: Paleoceanography at the Southern Ice Margin in the Bering Sea during Three Glacial-Interglacial Transitions

该项目的重点是通过沉积物岩心分析来记录白令海古海洋学过去的时空变化。项目建立在PI上？在白令海建立了基于硅藻的定量和定性海冰代用物，并参与了末次盛冰期以来北太平洋海温和海冰分布的大型综合研究。该项目将由一名初级教员领导，并将支持一名女性博士后学者。它将为博士论文提供基础，并使本科生在实验室中接触到古气候研究。这项工作将以几种方式向公众清楚而简洁地传达，重点是让妇女和女孩参与古海洋学。该项目有四个组成部分：(1)建立一个动态的、基于网络的北太平洋古海洋记录数据库；(2)利用该数据库识别过去50万年地球历史上三个暖期白令海古海洋的时空空白；(3)对存档岩心进行采样，创建新的、多代理的记录，可用于(a)重建海冰范围，(b)区分海冰与冰川的存在，(c)重建海面温度。(4)综合白令海古海洋记录，在冰期-间冰期和千年时间尺度上考察其变化。该项目的目标是：(1)进一步了解北太平洋冬季海冰边缘的位置，(2)确定气候系统的哪些方面控制了冬季海冰边缘的位置：热量输出，海面温度或大气环流，以及(3)推断初级生产力如何受到海冰范围减少的影响。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 focus of this project is to document the past temporal and spatial variability of Bering Sea paleoceanography through analyses of sediment cores. The project builds on the PI?s prior work creating diatom-based, quantitative and qualitative sea ice proxies in the Bering Sea and participating in large syntheses of North Pacific SST and sea ice distribution since the Last Glacial Maximum. The project will be led by a junior faculty member and will support a female postdoctoral scholar. It will provide the basis for a PhD thesis and also expose undergraduates to paleoclimate research in the lab. This work will be communicated clearly and concisely to the general public in several ways, with emphasis on engaging women and girls in paleoceanography.The project has four components: (1) building a dynamic, web-based database of North Pacific paleoceanographic records, (2) using this database to identify spatial and temporal gaps in Bering Sea paleoceanography during three warm periods of Earth history in the past 500,000 years, (3) sampling archived cores to create new, multi-proxy records that can be used for (a) reconstructing sea ice extent, (b) differentiating between the presence of sea ice versus glacial ice, (c) reconstructing sea surface temperatures, and (d) evaluating ventilation and ocean structure, productivity at various ocean levels, changes in the oxygen content of water masses, and the provenance of organic matter, and (4) synthesizing Bering Sea paleoceanographic records to examine variability on glacial-interglacial and millennial timescales. The goals of the project are: (1) to advance understanding of the location of the winter sea ice edge in the North Pacific over time, (2) to determine what aspects of the climate system control the location of the winter sea ice edge: heat export, sea surface temperature, or atmospheric circulation, and (3) to infer how primary productivity is affected by decreasing sea ice extent.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.