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

摘要: 利用35d时间基线的EnvisatASAR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。

Abstract: ThreepairsofEnvisatASARimagesata35daysintervalwereutilizedtomaptheiceveloci tyintheconfluencezoneoftheAmeryiceshelfintheEastAntarcticausinganoffset trackingmeth od.Accuracyassessmentandcomparativeanalysiswereconducted,whichconfirmedthereliabilityofourresults.Theicevelocityreachedashighas800m/aattheconfluencezoneoftheLambert,Mel lor,andFisherGlaciers.Therewerecertainvariationcharacteristicsoficevelocitynearthegroundingline,whichprovidedimportantreferenceswhendeterminingthepositionofthegroundingline.犓犲狔狑狅狉犱狊：ａｍｅｒｙｉｃｅｓｈｅｌｆ；ｉｃｅｆｌｏｗｖｅｌｏｃｉｔｙ；ｏｆｆｓｅｔｔｒａｃｋｉｎｇ；ｇｒｏｕｎｄｉｎｇｌｉｎｅ