利用偏移量跟踪测定Amery冰架冰流汇合区的冰流速
|
摘要
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.
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.
引文
[1]Phillips H A.Applications of ERS Satellite Radar Altimetry in the Lambert Glacier-Amery Ice Shelf System,East Antarctica[D].Hobart,Australia:University of Tasmania,1999
[2]Budd W F,Smith I L,Washart E.The Amery Ice Shelf Physics of Snow and Ice[C].International Conference on Low Temperature Science,Sapporo,Japan,1967
[3]Rignot E,Mouginot J,Scheuchl B.Ice Flow of the Antarctic Ice Sheet[J].Science,2011,333(6 048):1 427-1 430
[4]Strozzi T,Luckman A,Murray T,et al.Glacier Motion Estimation Using SAR Offset-tracking Procedures[J].Geoscience and Remote Sensing,IEEE Transactions on,2002,40(11):2 384-2 391
[5]Joughin I.Ice-sheet Velocity Mapping:A Combined Interferometric and Speckle-tracking Approach[J].Annals of Glaciology,2002,34(1):195-201
[6]Liu H X,Yu J,Zhao Z,et al.Calibrating and Mosaicking Surface Velocity Measurements from Interferometric SAR Data with a Simultaneous Leastsquares Adjustment Approach[J].International Journal of Remote Sensing,2007,28(6):1 217-1 230
[7]Pittard M L,Roberts J L,Warner R C,et al.Flow of the Amery Ice Shelf and Its Tributary Glaciers[C].The 18th Australasian Fluid Mechanics Conference,Launceston,Australia,2012
[8]Zhang Xiaohong,E Dongchen.Dynamic Parameters Determination of Amery Ice Shelf Using PPP[J].Geomatics and Information Science of Wuhan University,2005,30(10):909-912(张小红,鄂栋臣.用PPP技术确定南极Amery冰架的三维运动速度[J].武汉大学学报·信息科学版,2005,30(10):909-912)
[9]Michel R,Rignot E.Flow of Glacier Moreno,Argentina,from Repeat-pass Shuttle Imaging Radar Images:Comparison of the Phase Correlation Method with Radar Interferometry[J].Journal of Glaciology,1999,45(149):93-100
[10]GAMMA Documentation-user’s Guide.Interferometric SAR Processor-ISP[R].Version 1.0,GAMMA Remote Sensing and Consulting AG,Switzerland,2007
[11]Dong Xiaoyan,Ding Xiaoli,Li Zhiwei,et al.A New Chain for SAR Pixel Offset Estimation and Its Application in Co-seismic Deformation Measurement[J].Geomatics and Information Science of Wuhan University,2011,36(7):789-792(董晓燕,丁晓利,李志伟,等.一种新的SAR像素偏移量估计流程及其在同震形变监测中的应用[J].武汉大学学报·信息科学版,2011,36(7):789-792)
[12]Fricker H A,Allison I,Craven M,et al.Redefinition of the Amery Ice Shelf,East Antarctica,Grounding Zone[J].Journal of Geophysical Research,2002,107(B5),doi:10.1029/2001JB000383
[13]Rignot E,Mouginot J,Scheuchl B.Antarctic Grounding Line Mapping from Differential Satellite Radar Interferometry[J].Geophysical Research Letters,2011,38,L10504
[14]Gray A L,Mattar K E,Sofko G.Influence of Ionospheric Electron Density Fluctuations on Satellite Radar Interferometry[J].Geophysical Research Letters,2000,27(10):1 451-1 454
[15]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,2007,112,F01013
[16]Howat I M,Joughin I,Scambos T A.Rapid Changes in Ice Discharge from Greenland Outlet Glaciers[J].Science,2007,315(5818):1 559-1 561
[17]Bartholomew I,Nienow P,Mair D,et al.Seasonal Evolution of Subglacial Drainage and Acceleration in a Greenland Outlet Glacier[J].Nature Geoscience,2010,3(6):408-411
[18]Scambos T A,Bohlander J A,Shuman C A,et al.Glacier Acceleration and Thinning after Ice Shelf Collapse in the Larsen B Embayment,Antarctica[J].Geophysical Research Letters,2004,31,L18402
[19]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):45-51
[20]Liu H X,Zhao Z Y,Yu J,et al.SimultaneousLeast Squares Adjustment of Multiframe Velocities Derived from Interferometric and Speckle-Tracking Methods[J].Geoscience and Remote Sensing Letters,IEEE,2008,5(2):289-293
[2]Budd W F,Smith I L,Washart E.The Amery Ice Shelf Physics of Snow and Ice[C].International Conference on Low Temperature Science,Sapporo,Japan,1967
[3]Rignot E,Mouginot J,Scheuchl B.Ice Flow of the Antarctic Ice Sheet[J].Science,2011,333(6 048):1 427-1 430
[4]Strozzi T,Luckman A,Murray T,et al.Glacier Motion Estimation Using SAR Offset-tracking Procedures[J].Geoscience and Remote Sensing,IEEE Transactions on,2002,40(11):2 384-2 391
[5]Joughin I.Ice-sheet Velocity Mapping:A Combined Interferometric and Speckle-tracking Approach[J].Annals of Glaciology,2002,34(1):195-201
[6]Liu H X,Yu J,Zhao Z,et al.Calibrating and Mosaicking Surface Velocity Measurements from Interferometric SAR Data with a Simultaneous Leastsquares Adjustment Approach[J].International Journal of Remote Sensing,2007,28(6):1 217-1 230
[7]Pittard M L,Roberts J L,Warner R C,et al.Flow of the Amery Ice Shelf and Its Tributary Glaciers[C].The 18th Australasian Fluid Mechanics Conference,Launceston,Australia,2012
[8]Zhang Xiaohong,E Dongchen.Dynamic Parameters Determination of Amery Ice Shelf Using PPP[J].Geomatics and Information Science of Wuhan University,2005,30(10):909-912(张小红,鄂栋臣.用PPP技术确定南极Amery冰架的三维运动速度[J].武汉大学学报·信息科学版,2005,30(10):909-912)
[9]Michel R,Rignot E.Flow of Glacier Moreno,Argentina,from Repeat-pass Shuttle Imaging Radar Images:Comparison of the Phase Correlation Method with Radar Interferometry[J].Journal of Glaciology,1999,45(149):93-100
[10]GAMMA Documentation-user’s Guide.Interferometric SAR Processor-ISP[R].Version 1.0,GAMMA Remote Sensing and Consulting AG,Switzerland,2007
[11]Dong Xiaoyan,Ding Xiaoli,Li Zhiwei,et al.A New Chain for SAR Pixel Offset Estimation and Its Application in Co-seismic Deformation Measurement[J].Geomatics and Information Science of Wuhan University,2011,36(7):789-792(董晓燕,丁晓利,李志伟,等.一种新的SAR像素偏移量估计流程及其在同震形变监测中的应用[J].武汉大学学报·信息科学版,2011,36(7):789-792)
[12]Fricker H A,Allison I,Craven M,et al.Redefinition of the Amery Ice Shelf,East Antarctica,Grounding Zone[J].Journal of Geophysical Research,2002,107(B5),doi:10.1029/2001JB000383
[13]Rignot E,Mouginot J,Scheuchl B.Antarctic Grounding Line Mapping from Differential Satellite Radar Interferometry[J].Geophysical Research Letters,2011,38,L10504
[14]Gray A L,Mattar K E,Sofko G.Influence of Ionospheric Electron Density Fluctuations on Satellite Radar Interferometry[J].Geophysical Research Letters,2000,27(10):1 451-1 454
[15]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,2007,112,F01013
[16]Howat I M,Joughin I,Scambos T A.Rapid Changes in Ice Discharge from Greenland Outlet Glaciers[J].Science,2007,315(5818):1 559-1 561
[17]Bartholomew I,Nienow P,Mair D,et al.Seasonal Evolution of Subglacial Drainage and Acceleration in a Greenland Outlet Glacier[J].Nature Geoscience,2010,3(6):408-411
[18]Scambos T A,Bohlander J A,Shuman C A,et al.Glacier Acceleration and Thinning after Ice Shelf Collapse in the Larsen B Embayment,Antarctica[J].Geophysical Research Letters,2004,31,L18402
[19]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):45-51
[20]Liu H X,Zhao Z Y,Yu J,et al.SimultaneousLeast Squares Adjustment of Multiframe Velocities Derived from Interferometric and Speckle-Tracking Methods[J].Geoscience and Remote Sensing Letters,IEEE,2008,5(2):289-293