利用SAR数据研究南极Grove山地区冰流运动特征
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摘要
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.
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.
引文
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[2]Zhou Chunxia,Ai Songtao,Chen Nengcheng,et al.Grove Mountains Meteorite Recovery and Relevant Data Distribution Service[J].Computers&Geosciences,2011,37(11):1 727-1 734
[3]Massonnet D,Rossi M,Carmona C,et al.The Displacement Field of the Landers Earthquake Mapped by Radar Interferometry[J].Nature,1993,364(6 433):138-142
[4]Cheng Xiao,Li Xiaowen,Shao Yun,et al.DInSAR Measurement of Glacier Motion in Antarctic Grove Mountain[J].Chinese Science Bulletin,2007,52(3):358-366
[5]Rignot E,Mouginot J,Scheuchl B.Ice Flow of the Antarctic Ice Sheet[J].Science,2011,333(6 048):1 427-1 430
[6]Zhou Chunxia,Deng Fanghui,Ai Songtao,et al.Determination of Ice-flow Velocity at the Polar Record Glacier and Dalk Glacier Using DInSAR[J].Geomatics and Information Science of Wuhan University,2014,39(8):940-944(周春霞,邓方慧,艾松涛,等.利用DInSAR的东南极极记录和达尔克冰川冰流速提取与分析[J].武汉大学学报·信息科学版,2014,39(8):940-944)
[7]Rignot E,Casassa G,Gogineni P,et al.Accelerated Ice Discharge from the Antarctic Peninsula Following the Collapse of Larsen BIce Shelf[J].Geophysical Research Letters,2004,31(18),10.1029/2004GL020697
[8]Rignot E.Changes in Ice Dynamics and Mass Balance of the Antarctic Ice Sheet[J].Philosophical Transactions of the Royal Society A:Mathematical,Physical and Engineering Sciences,2006,364(1 844):1 637-1 655
[9]King M A,Coleman R,Morgan P J,et al.Velocity Change of the Amery Ice Shelf,East Antarctica,During the Period 1968-1999[J].Journal of Geophysical Research:Earth Surface(2003-2012),2007,112(F1),10.1029/2006JF00060
[10]Scheuchl B,Mouginot J,Rignot E.Ice Velocity Changes in the Ross and Ronne Sectors Observed Using Satellite Radar Data from 1997and 2009[J].The Cryosphere,2012,6(5):1 019-1 030
[11]Zhou Chunxia,Zhou Yu,Deng Fanghui,et al.Seasonal and Interannual Ice Velocity Changes of Polar Record Glacier,East Antarctica[J].Annals of Glaciology,2014,55(66):45-61
[12]Zebker H A,Villasenor J.Decorrelation in Interferometric Radar Echoes[J].IEEE Transactions on Geoscience and Remote Sensing,1992,30(5):950-959
[13]Strozzi T,Luckman A,Murray T,et al.Glacier Motion Estimation Using SAR Offset-tracking Procedures[J].IEEE Transactions on Geoscience and Remote Sensing,2002,40(11):2 384-2 391
[14]Bamber J L,Gomez-Dans J L,Griggs J A.A New1km Digital Elevation Model of the Antarctic Derived from Combined Satellite Radar and Laser Data(Part 1):Data and Methods[J].The Cryosphere,2009,3(1):101-111
[15]Griggs J A,Bamber J L.A New 1km Digital Elevation Model of Antarctica Derived from Combined Radar and Laser Data(Part 2):Validation and Error Estimates[J].The Cryosphere,2009,3(1):113-123
[16]GAMMA.Documentation Interferometric SAR Processor-ISP[R].User’s Guide,Version 1.0,GAMMA Remote Sensing and Consulting AG,Switzerland,2007
[17]Deng Fanghui,Zhou Chunxia,Wang Zemin,et al.Ice-flow Velocity Derivation of the Confluence Zone of the Amery Ice Shelf Using Offset-tracking Method[J].Geomatics and Information Science of Wuhan University,2015,40(7):901-906(邓方慧,周春霞,王泽民,等.利用偏移量跟踪测定Amery冰流汇合区的冰流速[J].武汉大学学报·信息科学版,2015,40(7):901-906)