利用DInSAR的东南极极记录和达尔克冰川冰流速提取与分析

Determination of Ice-flow Velocity at the Polar Record Glacierand Dalk Glacier Using DInSAR

摘要: 目的利用1996年 ERS-1/2tandem SAR数据,采用 DInSAR方法提取了极记录和达尔克冰川的冰流速,并利用冰流速转换模型和该地区的实测值进行了对比。结果表明,DInSAR结果很好地体现了整个区域的冰流速。对于内陆地区,DInSAR提取的监测点冰流速和实测值非常吻合;对于达尔克冰川的前缘,受时间差异和潮汐等因素的影响,DInSAR推求的冰流速结果略小于实测值。

Abstract: Objective ERS-1/2tandem SAR images acquired in 1996were utilized to map the ice-flow velocity ofthe Polar Record and Dalk Glaciers using DInSAR.The horizontal component was derived from line-of-sight velocity estimates,and compared with the field measurements.The DInSAR results revealedan ice velocity map of the whole area.For the inland areas,the DInSAR results were in good agree-ment with field measurements.As for the front of the Dalk Glacier,the ice velocity derived from DIn-SAR was smaller than the field measurements because of the differences between data acquisitiontimes,tidal motion,etc.