利用偏移量跟踪测定Amery冰架冰流汇合区的冰流速

Ice-flow Velocity Derivation of the Confluence Zone of the Amery Ice Shelf Using Offset-tracking Method

利用35d时间基线的Envisat ASAR数据对,采用偏移量跟踪方法对东南极Amery冰架冰流汇合区的冰流速进行了测定,并对流速结果进行了精度评定和对比分析,验证了本文结果的可靠性。结果显示,Lambert、Mellor及Fisher冰川在Amery冰架后缘交汇处冰流速最大可达800m/a;汇合区接地线附近的冰流速存在一定的变化特征,该特征是辅助确定接地线位置的重要参考信息。

Three pairs of Envisat ASAR images at a 35 days interval were utilized to map the ice velocity in the confluence zone of the Amery ice shelf in the East Antarctica using an offset-tracking method.Accuracy assessment and comparative analysis were conducted,which confirmed the reliability of our results.The ice velocity reached as high as 800m/a at the confluence zone of the Lambert,Mellor,and Fisher Glaciers.There were certain variation characteristics of ice velocity near the grounding line,which provided important references when determining the position of the grounding line.