利用SAR数据研究南极Grove山地区冰流运动特征

Ice-flow Features in the Grove Mountains Area Using SAR Data

Grove山地区是我国南极PANDA断面考察的重点研究区域之一。本文利用35d时间间隔的Envisat ASAR数据,分别采用DInSAR、偏移量跟踪以及两者相结合的方法提取了该区域冰面流速信息,描述了该区域复杂的冰流运动特征,并对Grove山核心区的冰流运动特征进行分析。利用GPS实测数据和MEaSUREs流速进行精度分析,说明了结果的可靠性,并利用2006、2007和2009年三期南极冬季SAR数据提取了Grove山地区冰流速,发现该区域冰流速无明显年际变化。

The Grove Mountains area is a key study area in Chinese PANDA section of East Antarctica.Envisat ASAR images of 35 days interval were utilized to map the ice velocity in the Grove Mountains with DInSAR and offset-tracking methods.An ice velocity map of Grove Mountains displays complex motion features influenced by the widespread distribution of rocks and nunataks.We found two large ice streams bounding the Grove Mountains area,with a maximum velocity of 40m/a.Some small ice streams flow between the nunataks in the area.GPS measurements and ice velocity MEaSUREs were applied to evaluate the accuracy,confirming the reliability of our results.Comparing winter ice velocities for the years 2006,2007 and 2009,we detected no obvious interannual ice velocity changes in the Grove Mountains.