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      Permanent link:
      https://www.ias.ac.in/article/fulltext/jess/129/0127

    • Keywords

       

      Antarctic ice shelves; thickness change; CryoSat-2; ICESat; Operation IceBridge

    • Abstract

       

      Ice-shelf thickness changes are of critical importance for understanding the stability of the Antarctic ice-sheet because they restrain the seaward flow of grounded glaciers. In this study, we find that neither backscatter nor leading-edge width contained in the least-squares fitting model can improve the accuracy of ice-shelf thickness change estimations from CryoSat-2, which is validated by comparing the CryoSat-2-derived elevation changes from least-squares fitting models with different combinations of waveform parameters against the Operation IceBridge ATM L4 data. Using the model without backscatter and leading-edge width to infer the thickness changes in Antarctic ice shelves from CryoSat-2, we find that the most significant thinning signals are mainly concentrated on the ice shelves along the Amundsen Sea coast, such as Getz, whose thickness variations are dominated by ocean-driven basal melting. This phenomenon has also been confirmed by the ICESat results. Overall, the Antarctic ice shelves volume changed on average by $–0.34 \pm 66.36 \rm{km^{3} yr^{-1}}$ during the period from July 2010 to December 2016.

    • Author Affiliations

       

      BAOJUN ZHANG1 JINGBIN LIU1 ZEMIN WANG2 TINGTING LIU2 QUANMING YANG2

      1. State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430 079, China.
      2. Chinese Antarctic Center of Surveying and Mapping, Wuhan University, Wuhan 430 079, China.
    • Dates

       
  • Journal of Earth System Science | News

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