利用测高数据研究南极冰盖高程变化

ON ICE SHEET HEIGHT CHANGES OVER ANTARCTIC FROM ALTIMETRY DATA

对2002-2006年的ENVISAT资料进行重定位改正及有关的地球物理改正后，获取了3年内的南极冰盖平均高程模型ENVISAT—DEM，与RAMP—DEM相比，平均差异约为18m，精度相当。同时，对此期间南极冰盖上几个剖面的高程变化进行了分析，得到其平均高程变化均在分米级（-0．31～0．17m）。

The mean ENVISAT-DEM of 3 years over Antarctic ice sheet is derived from ENVISAT altimeter data applied relocation and geophysical correction. The mean height difference between ENVISAT-DEM and RAMP - DEM is about 18m,it means that their accuracies are close to each other. Moreover, the height changes of several profiles over Antarctic ice sheet between 2003 and 2006 are also analyzed, the results show that the height changes are in a range of -0.31 -0.17 m.