基于GRACE卫星重力数据估计格陵兰岛冰盖质量变化  

Greenland ice sheet mass variations based on GRACE satellite gravity data

作　　者：冯贵平 王其茂[1,2] 宋清涛[1,2] Feng Guiping;Wang Qimao;Song Qingtao(National Satellite Ocean Application Service,Beijing 100081,China;Key Laboratory of Ocean Space Remote Sensing and Application,State Oceanic Administration,Beijing 100081,China;Center for Earth System Science,Tsinghua University,Beijing 100084,China;College of Marine Sciences,Shanghai Ocean University,Shanghai 201306,China)

机构地区：[1]国家卫星海洋应用中心,北京100081 [2]国家海洋局空间海洋遥感与应用研究重点实验室,北京100081 [3]清华大学地球系统科学中心,北京100084 [4]上海海洋大学海洋科学学院,上海201306

出　　处：《海洋学报》2018年第11期73-84,共12页

基　　金：国家重点研发计划(2018YFC1407203);国家自然科学基金项目(41276019;41506211);上海海洋大学科技发展基金(A2-0203-00-100228)

摘　　要：重力场恢复与气候试验(GRACE)卫星为高分辨率地监测全球冰川质量变化提供了一种新的手段。本文利用2003年1月至2014年12月Level-2 RL05的GRACE产品,进行去相关误差滤波、高斯滤波和海洋-陆地信号泄漏改正后,得到了格陵兰岛冰盖质量变化的时间序列,分析了格陵兰岛冰盖质量变化的长期趋势项,并与ICESat的结果进行了比较验证。研究表明,在2003年1月至2014年12月之间,格陵兰岛冰盖质量减小速率约为(-260±43)Gt/a,对全球海平面的贡献约为(0.72±0.12)mm/a,对同时期海平面上升的贡献占25.8%,并且格陵兰岛冰盖消融有着很强的区域差异性,冰盖消融的区域主要集中在边缘区域,中部内陆地区的冰盖质量则有增加的趋势。并进一步和ICESat的结果进行了比较分析,ICESat的结果显示格陵兰岛冰盖质量减小速率约为(-174±43)～(-184.8±28.2)Gt/a,而GRACE的结果则为(-209.4±26.3)Gt/a,有着较好的一致性,并且区域分布特征也符合较好。The Gravity Recovery and Climate Experiment(GRACE)mission launched in 2002 provided a new opportunity to estimate the global mass variations with high temporal-spatial resolution.We use the GRACE RL05 data from January 2003 to December 2014 to estimate the Greenland ice mass variations.We applied 500 km Gaussian smoothing,a decorrelation filtering and a forward modelling to reduce the land-ocean leakage effects to obtain the time series of Greenland′s ice sheet mass,analyzes the long-term trend of Greenland ice sheet,and compared with the ICESat results.Results show that the mass change rate of the Greenland ice sheet from January 2003 to December 2014 is(-260±43)Gt/a,equivalent to(0.72±0.12)mm/a of the global sea level change,which occupied the 25.8%contribution to sea level rise.And the Greenland ice sheet melting has a very strong regional differences,mainly concentrated in the edge of the area,while for the central region,the central inland ice sheet has a tendency to increase.And we further compared with the ICESat result to verify our results.The result of the ICESat show hat the mass change rate of the Greenland ice sheet is from(-174±43)Gt/a to(-184.8±28.2)Gt/a,and the result of GRACE is about(-209.4±26.3)Gt/a,and have a good consistency,and the characteristics of regional distribution have also a good agreement.

关 键 词：GRACE ICESAT 格陵兰岛冰盖 质量变化 

分 类 号：P715.6[天文地球—海洋科学] P731.15