基于GRACE时变重力场反演南极冰盖质量变化  

INVESTIGATION ON MASS CHANGE OF ICE SHEET IN ANTARCTIC FROM GRACE TIME-VARIABLE GRAVITY DATA

作　　者：李军海[1,2] 刘焕玲[1,2] 文汉江[1] 朱广彬[3] 方爱平[1] 

机构地区：[1]中国测绘科学研究院,北京100830 [2]辽宁工程技术大学测绘与地理科学学院,阜新123000 [3]武汉大学测绘学院,武汉430079

出　　处：《大地测量与地球动力学》2011年第3期42-46,共5页Journal of Geodesy and Geodynamics

基　　金：国家863计划重点项目(2009AA121402);国家自然科学基金(40874012)

摘　　要：利用UTCSR发布的GRACE Level-2 RL04版本2003-01—2008-08月的重力场模型估计南极冰盖质量变化。由于GRACE提供的C20项不准确,利用SLR测得的C20项进行替换。对于经度方向上出现的条纹状信号,采用去相关滤波处理。选择去掉其中某一个月的位模型重新反演南极冰盖质量变化,发现相同区域的质量变化率并没有发生很大的变化。联合得到的位模型、滤波技术以及ICE-5G冰后回弹模型观测到的西南极Amundsen地区和南极半岛的冰盖质量消融现象,其等效水高变化分别为-5.28±0.95 cm/a、-1.82±0.77 cm/a;而Ronne冰架以及东部Enderby地区冰盖质量在增加,分别为1.42±0.69 cm/a、1.43±0.72 cm/a。与已有研究结果比较发现:西南极冰盖质量在加速融化,而Ronne冰架以及东部Enderby地区冰盖等效水高变化率没有发生大的变化。The rates of Antarctic ice mass change have been estimated by use of the gravity solutions from GRACE level-2 RL04 for the period of January 2003 to August 2008 released by UTCSR.Because C20 of GRACE is not accurate enough,C20 from Satellite Laser Ranging（SLR） is adopted instead.The decorrelation filter technique is used for the stripe shape signal presenting in the longitude direction.Antarctic ice mass change rates are investigated again when the gravity in some one month has been chosen to get rid of,and the results are that the rates of Antarctic ice mass do not change a lot in the same area.Gravity model,filtering technique and ICE-5G postglacial rebound model are combined to observe the ice loss in the west Amundsen Sea Embayment and the northern Antarctic Peninsula,the rates are-5.28±0.95 cm/a and-1.82±0.77cm/a respectively.Whereas ice mass rates in Southern Ronne Ice Shelf and Enderby land in east Antarctic are positive,and the rates are 1.42±0.69 cm/a and 1.43±0.72 cm/a respectively.Compared with the existing research results,the mass in the west Amundsen Sea Embayment is melting fast,whereas the mass rates in Southern Ronne Ice Shelf and Enderby land in east Antarctic change a little.

关 键 词：GRACE 南极 重力场 相关误差滤波 质量变化率 

分 类 号：P333[天文地球—水文科学]