Retrieving the grounding lines of the Riiser-Larsen Ice Shelf using Sentinel-1 SAR images  

作　　者：Faming Gong Kui Zhang Shujun Liu 

机构地区：[1]School of Microelectronics and Communication Engineering,Chongqing University,Chongqing,People's Republic of China

出　　处：《International Journal of Digital Earth》2023年第1期2467-2486,共20页国际数字地球学报（英文）

基　　金：funded by the National Natural Science Foundation of China(Grant No.42074034).

摘　　要：Accurately locating and studying grounding lines is essential for predicting the response of glaciers to climate change.However,it is challenging tofind grounding lines since they are subglacial features.In this study,Sentinel-1 synthetic aperture radar(SAR)data were utilized to derive the grounding lines of the Riiser-Larsen Ice Shelf.A new method with inspiration drawn from multi-temporal baseline InSAR techniques is proposed.It takes advantage of the temporal consistency of the vertical displacement gradients and identifies grounding zones pixel-by-pixel on a stack of double differential interferograms,thereby providing grounding line proxies.As it fully exploits coherent signals in both spatial and temporal domains,the maximum possible number of grounding zone pixels can be obtained.Moreover,due to the introduction of the concept of the temporal consistency,the method can cope with short term grounding linefluctuations to some extent and may mitigate the influences of atmospheric disturbances and residual ice displacements.The resulting grounding lines are compared with the MEaSUREs Antarctic grounding line product.The comparison confirms the effectiveness of the proposed method and corroborates that the Riiser-Larsen Ice Shelf should have not undergone significant changes over the past few decades.

关 键 词：ANTARCTICA ice shelf grounding line radar interferometry Sentinel-1 images 

分 类 号：TN95[电子电信—信号与信息处理]