基于GRACE卫星RL05数据的南极冰盖质量变化分析

Antarctic ice mass change analysis based on GRACE RL05 data

CSR(Centre for Space Research)最近发布了RL05数据,其空间分辨率、精度和周期变化特性等都优于RL04数据.本文采用300km的扇形滤波及P5M11去相关滤波削弱南北条带等重力场模型误差,并采用Paulson2007模型进行冰川均衡模型改正,利用CSR RL05与RL04数据计算分析了南极2002年到2012年的质量变化序列及其变化趋势的空间分布特性,并选取8个特征点进一步分析了其质量变化序列.同时,对CSR、JPL(Jet Propulsion Laboratory)、GFZ(GeoForschungsZentrum)三个机构发布的RL05数据采用相同的滤波方法进行计算,得到整个南极的质量变化分别为-195.7±20.5Gt/a、-203.8±23.1Gt/a、-133.2±29.9Gt/a,对全球海平面变化的影响分别为0.54±0.06mm/a、0.56±0.06mm/a、0.37±0.09mm/a.

The spatial resolution,accuracy and periodical characteristics of the latest release RL05 data by CSR （Centre for Space Research） are all superior to RL04 data.In this paper,the northsouth stripe errors and other model errors of RL05 and RL04 data are reduced by using Fan filtering of 300 km radius and P5M11 decorrelated filtering,and the Paulson2007 model is used for the GIA （Glacial Isostatic Adjustment） correction.Both RL05 and RL04 data are used to analyze the Antarctic mass change series and the spatial distribution characteristics from 2002 to 2012.Meanwhile the mass change series of 8 characteristic points are further analyzed.Moreover the Antarctic mass changes are also processed and analyzed using the RL05 data of JPL （Jet Propulsion Laboratory） and GFZ （GeoForschungsZentrum）.The Antarctic mass change rates derived from the RL05 data of CSR,JPL and GFZ are-195.7±20.5 Gt/a,-203.8±23.1 Gt/a,and-133.2±29.9 Gt/a,the correspondent sea rising rates are 0.54±0.06 mm/a,0.56±0.06 mm/a,and 0.37±0.09 mm/a,respectively.