浙江近海海域近百年来的沉积硅藻记录及定量古环境重建

项目名称： 浙江近海海域近百年来的沉积硅藻记录及定量古环境重建

项目编号： No.41302134

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： 李冬玲

作者单位： 宁波大学

项目金额： 24万元

中文摘要： 近百年来是人类活动对气候影响的最重要时期。近百年来的气候变化是衔接地质记录与器测资料的关键环节，也是预测未来气候变化的基础。浙江近海北部紧邻长江口，对东亚季风及其作用下长江冲淡水的季节性转向反应灵敏。本项目将分析浙江近海海域的表层沉积硅藻样品，建立该区的硅藻-环境变量数据库。并系统分析浙江近海3个高分辨率钻孔近百年来的沉积硅藻记录，探讨硅藻组合变化与古海洋环境变迁（如温度和盐度）之间的关系。在硅藻-环境变量数据库基础上，建立适合于对浙江近海钻孔硅藻数据进行古温度/古盐度计算的转换函数，其最终目标是重建浙江近海海域近百年来的古温度/古盐度变化曲线，以此为依据定量研究浙江近海近百年来的气候变化规律，讨论其与季风气候、厄尔尼诺-南方涛动以及全球变化的关系。

中文关键词： 冬季海水表层温度；夏季海水表层盐度；季风；海冰；东海

英文摘要： Climate change over the last century was largely impacted by human activities, and it's a key link of ancient geologic records and instrumental data, a basis for predicting climate change in future. The north of coastal area in Zhejiang is near to the Changjiang Estuary, so it's sensitive to changes in the strength of East Asian Monsoon and the flow direction of Changjiang River diluted water. The distribution of diatoms from surface sediments around the coastal area in Zhejiang will be studied in this project, with a purpose of constructing a database of diatom-environmental variables(including winter sea-surface temperature SST and summer sea-surface salinity SSS). Besides, changes in abundance of diatoms from three gravity cores along the coastal area in Zhejiang will also be analyzed in this project, and diatoms' response to oceanic environmental change over the last century will be discussed. On the basis of the diatom-environmental variables database, an approprite transfer function will be selected to reconstruct changes in SST and SSS over the last century in the study area. The final aim for this project is to reconstruct the SST/SSS along the coastal area in Zhejiang over the last century, and discuss palaeoceanic environment change and its response to East Asian Monsoon or El Ni?o-Southern Oscillation

英文关键词： Winter sea surface temperature；Summer sea surface salinity；Monsoon；Arctic Sea Ice；East China Sea