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A Joint Inversion Estimate of Antarctic Ice Sheet Mass Balance Using Multi-Geodetic Data Sets

Gao, Chunchun, Lu, Yang, Zhang, Zizhan, and Shi, Hongling, 2019. A Joint Inversion Estimate of Antarctic Ice Sheet Mass Balance Using Multi-Geodetic Data Sets. Remote Sensing, 11(6):653, doi:10.3390/rs11060653.

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@ARTICLE{2019RemS...11..653G,
       author = {{Gao}, Chunchun and {Lu}, Yang and {Zhang}, Zizhan and {Shi}, Hongling},
        title = "{A Joint Inversion Estimate of Antarctic Ice Sheet Mass Balance Using Multi-Geodetic Data Sets}",
      journal = {Remote Sensing},
     keywords = {Antarctic ice sheet, mass balance, glacial isostatic adjustment (GIA), joint inversion estimate, Gravity Recovery and Climate Experiment (GRACE), Ice, Cloud and land Elevation Satellite (ICESat), Global Positioning System (GPS)},
         year = 2019,
        month = mar,
       volume = {11},
       number = {6},
          eid = {653},
        pages = {653},
     abstract = "{Many recent mass balance estimates using the Gravity Recovery and
        Climate Experiment (GRACE) and satellite altimetry (including
        two kinds of sensors of radar and laser) show that the ice mass
        of the Antarctic ice sheet (AIS) is in overall decline. However,
        there are still large differences among previously published
        estimates of the total mass change, even in the same observed
        periods. The considerable error sources mainly arise from the
        forward models (e.g., glacial isostatic adjustment [GIA] and
        firn compaction) that may be uncertain but indispensable to
        simulate some processes not directly measured or obtained by
        these observations. To minimize the use of these forward models,
        we estimate the mass change of ice sheet and present-day GIA
        using multi-geodetic observations, including GRACE and Ice,
        Cloud and land Elevation Satellite (ICESat), as well as Global
        Positioning System (GPS), by an improved method of joint
        inversion estimate (JIE), which enables us to solve
        simultaneously for the Antarctic GIA and ice mass trends. The
        GIA uplift rates generated from our JIE method show a good
        agreement with the elastic-corrected GPS uplift rates, and the
        total GIA-induced mass change estimate for the AIS is 54
        {\ensuremath{\pm}} 27 Gt/yr, which is in line with many recent
        GPS calibrated GIA estimates. Our GIA result displays the
        presence of significant uplift rates in the Amundsen Sea
        Embayment of West Antarctica, where strong uplift has been
        observed by GPS. Over the period February 2003 to October 2009,
        the entire AIS changed in mass by -84 {\ensuremath{\pm}} 31
        Gt/yr (West Antarctica: -69 {\ensuremath{\pm}} 24, East
        Antarctica: 12 {\ensuremath{\pm}} 16 and the Antarctic
        Peninsula: -27 {\ensuremath{\pm}} 8), greater than the GRACE-
        only estimates obtained from three Mascon solutions (CSR: -50
        {\ensuremath{\pm}} 30, JPL: -71 {\ensuremath{\pm}} 30, and GSFC:
        -51 {\ensuremath{\pm}} 33 Gt/yr) for the same period. This may
        imply that single GRACE data tend to underestimate ice mass loss
        due to the signal leakage and attenuation errors of ice
        discharge are often worse than that of surface mass balance over
        the AIS.}",
          doi = {10.3390/rs11060653},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2019RemS...11..653G},
      adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}

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