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《Chinese Journal of Geophysics》 2011-04
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Mass change detection in Antarctic ice sheet using ICESat block analysis techniques from 2003~2008

SHI Hong-Ling~(1,2),LU Yang~(1,2),DU Zong-Liang~(1,2),JIA Lu-Lu~(1,2), ZHANG Zi-Zhan~(1,2),ZHOU Chun-Xia~3 1 Institute of Geodesy and Geophysics,Chinese Academy of Sciences,Wuhan 430077,China 2 Key Laboratory of Dynamic Geodesy,Chinese Academy of Sciences,Wuhan 430077,China 3 Chinese Antarctic Center of Surveying and Mapping,School of Geodesy and Geomatics Wuhan University, Wuhan 430079,China  
In this paper,the ICESat laser altimetry data is used to obtain an estimate of the mass balance of Antarctic ice sheet from February 2003 to March 2008.The time series of elevation change in Antarctic ice sheet are derived by the block crossover analysis using the ICESat nadir ground track,and the calculation of the campaign basis is discussed.A least square regression of crossover difference is applied to calculate the average elevation change trend and the seasonal cycle,and then the mass changes of Antarctic ice sheet are estimated by combining the elevation change rate with the surface firn density model.The result shows that seasonal cycle signals are obvious in Antarctic ice sheet height changes,and the average annual amplitude is about 2.21 cm.On the coast of the Antarctica continent,there are significant thinning and thickening, especially near the Amundsen Sea embayment of west Antarctic and Antarctic Peninsula. Considering the influence of GIA(three public GIA models),our best estimate of the mass change in Antarctic ice sheet is about -82~-73Gt/yr.For the ICESat,the ice sheet surface firn density model and the GIA model are the main factors in the mass change estimates.
【Fund】: 国家自然基金(40874037;40974045);; 国家863计划(2009AA12Z133;2006AA12Z128);; 极地科学战略研究基金(20080207);; 中国科学院动力大地测量学重点实验室开放基金(L09-18)联合资助
【CateGory Index】: P941.61
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