基于南极冰芯记录的300年来南半球环状模（SAM）的时空演化分异特征研究

项目名称： 基于南极冰芯记录的300年来南半球环状模（SAM）的时空演化分异特征研究

项目编号： No.41206188

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 海洋科学

项目作者： 史贵涛

作者单位： 中国极地研究中心

项目金额： 28万元

中文摘要： SAM是南半球热带外大气环流的主要模态，其变率在多个时间尺度上对全球及区域气候系统产生重要影响，因此其演化规律近年来得到较多关注，但SAM演化的空间变异规律尚不清晰。本研究以南极不同地理单元冰芯稳定同位素、离子浓度等数据资料为基础，在冰芯记录定年精度、时间分辨率等具有可比性的前提下，结合再分析资料，利用空间分析工具探讨冰芯记录与大气场异常的关系，构建反演SAM序列的代用指标；从地理空间分异的研究视角重建过去300年SAM序列，揭示不同地理单元SAM演化的年际-年代际变化规律、变化幅度和位相关系等，进而阐明SAM演化的空间变异特征；结合300年冰芯记录进一步探讨南极不同区域大气环流和物质输送过程的变化。SAM时空演化特征的探讨有助于预测SAM发展趋势，对评估和理解气候变化模型参数、提高气候预测精度等具有重要的科学意义和价值。

中文关键词： 南半球环状模（SAM）；南极冰芯；代用指标；关联分析；

英文摘要： Southern Annular Mode (SAM) is the principal mode of the Southern Hemisphere extra-tropical atmospheric circulation. The variability of SAM on multiple timescales could influence both the regional- and global- scale climate systems significantly; therefore the evolution patterns of SAM have aroused more and more concern in recent years. However, the spatial variation characteristics of SAM have not been clarified so far. In this study, the stable isotope ratios, ion concentrations of the ice cores collected in different Antarctic regions are utilized as the potential proxies of SAM reconstruction,and the NCEP/NCAR, ERA-40 reanalysis are the secondary data. The correlations between ice core records (time resolution and climatic implications of the proxies of ice cores are comparable) and atmospheric pressure anomalies will be investigated with the aids of spatial analysis models. Subsequently, the proxies of SAM reconstruction could be established. The SAM evolution sequences in varied geographical regions then will be reconstructed from a spatial differentiation perspective, and the interannual and interdecadal variabilities, amplitudes and phases of different SAM sequences could be elucidated.Thereby, the spatial variations of SAM could be illuminated. Together with the 300 years' ice core records, variations o

英文关键词： Southern Annular Mode；Antarctic ice core；proxy；correlation analysis；