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记录白令海古海洋学过去的时空变化。该项目建立在PI？在白令海建立了基于SST的定量和定性海冰代理，并参与了自末次冰盛期以来北太平洋SST和海冰分布的大型合成。该项目将由一名初级教员领导，并将支持一名女博士后学者。它将为博士论文提供基础，并使本科生在实验室中进行古气候研究。这项工作将以多种方式简明扼要地向公众宣传，重点是让妇女和女孩参与古海洋学。（1）建立一个动态的、基于网络的北太平洋古海洋学记录数据库，（2）利用该数据库确定过去500年地球历史上三个温暖时期白令海古海洋学的时空空白，000年，（3）对存档的岩心进行取样，以创建新的多代理记录，这些记录可用于（a）重建海冰范围，（B）区分海冰与冰川冰的存在，（c）重建海面温度，以及（d）评估通风和海洋结构，不同海平面的生产力，水团氧含量的变化，（4）综合白令海古海洋学记录，研究冰川-间冰期和千年时间尺度上的变化。该项目的目标是：（1）促进对北太平洋冬季海冰边缘位置的认识，（2）确定气候系统的哪些方面控制着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）以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NSF的法定使命，并被认为是值得通过使用基金会的智力价值和更广泛的影响审查标准。

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.