白令海东南部末次冰期以来的表层海水环境和陆源输入的变化

项目名称： 白令海东南部末次冰期以来的表层海水环境和陆源输入的变化

项目编号： No.41306195

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 天文学、地球科学

项目作者： 肖文申

作者单位： 同济大学

项目金额： 26万元

中文摘要： 白令海是连接北冰洋和太平洋的唯一水道，是全球最重要的碳汇之一，也是冰期北太平洋中层水的发源地。因此白令海的气候变化对全球气候有重大影响。末次冰期以亚北极太平洋和白令海都经历了类似北大西洋和格陵兰冰芯记录的千年尺度的快速气候波动，但从现有的记录来看，两个区域的气候变化是否同步仍存在很大的争议。两个关键区域的联系和机制尚无定论。获得亚北极太平洋及白令海高分辨率的表层海水温度、海冰变化，海陆关系等重要信息是理解大洋环流、大西洋-太平洋的区域关联的重要的参数，提供模拟迅速气候变化的边界条件，是了解北太平洋深层水生成机制的窗口。本项目以德国INOPEX航次在东南白令海采集的高质量沉积岩芯为材料，以硅藻为主要分析手段，结合地球化学方法，分析白令海末次冰期以来表层海水温度、海冰、陆源输入等关键古环境参数，揭示白令海与北太平洋的关联，进而揭示其在洋流、大气等传输媒介下与全球气候变化的响应和驱动机制。

中文关键词： 白令海；末次冰期至全新世；硅藻；海冰；海平面

英文摘要： The Bering Sea is the only water route connecting the Arctic and Pacific Oceans. It is one of the most important carbon sink in the global oceans, and it is believed to be the source area of glacial North Pacific Intermediate Water. Thus, the climate change in the Bering Sea has great impact on the global climate.Since the last glacial, the Subarctic Pacific has experienced millennial scale rapid climate oscillations similar to those recorded in the North Atlantic and Greenland Ice cores. However, controversial conclutions are drawn from the existing record in the North Pacific that whether the climate developement in the Subarctic Pacific is in phase with the North Atlantic. And the mechanism of the teleconnection between these two climate key areas are unknown. High resolution records of sea surface temperature development, sea ice variability and sea-land relations are key parameters understanding the teleconnections between the North Pacific and North Atlantic Oceans, providing the boundary conditions for modeling the rapid climate oscillations. It is also the window to understand the deep water formation in the North Pacific. This project aims to study the sediment core retrieved from the Southeasten Bering Sea during the German INOPEX expedition, by using diatom and geochemical methods, to obtain the devel

英文关键词： Bering Sea；Last Glacial to Holocene；diatom；sea ice；sea level