The Greenland Ice Sheet (GrIS) is losing mass at a rate that represents a major contribution to global sea-level rise in recent decades. In this study, we use the Gravity Recovery and Climate Experiment (GRACE) data to retrieve the time series variations of the GrIS from April 2002 to June 2017. We also estimate the mass balance from the RACMO2.3 and ice discharge data in order to obtain a comparative analysis and cross-validation. A detailed analysis of long-term trend and seasonal and inter-annual changes in the GrIS is implemented by GRACE and surface mass balance (SMB) modeling. The results indicate a decrease of −267.77 ± 8.68 Gt/yr of the GrIS over the 16-year period. There is a rapid decline from 2002 to 2008, which accelerated from 2009 to 2012 before declining relatively slowly from 2013 to 2017. The mass change inland is significantly smaller than that detected along coastal regions, especially in the southeastern, southwestern, and northwestern regions. The mass balance estimates from GRACE and SMB minus ice discharge (SMB-D) are very consistent. The ice discharge manifests itself mostly as a long-term trend, whereas seasonal mass variations are largely attributed to surface mass processes. The GrIS mass changes are mostly attributed to mass loss during summer. Summer mass changes are highly correlated with climate changes.

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来自 GRACE 的格陵兰冰盖的质量平衡和表面质量平衡建模

格陵兰冰盖 (GrIS) 的质量正在以一种代表近几十年来全球海平面上升的主要因素的速度减少。在本研究中，我们使用重力恢复和气候实验 (GRACE) 数据来检索 2002 年 4 月至 2017 年 6 月 GRIS 的时间序列变化。我们还估计了 RACMO2.3 和冰排放数据的质量平衡，以便获得比较分析和交叉验证。通过 GRACE 和地表质量平衡 (SMB) 建模对 GRIS 的长期趋势以及季节性和年际变化进行了详细分析。结果表明，在 16 年期间，GrIS 减少了 -267.77 ± 8.68 Gt/yr。2002-2008年下降较快，2009-2012年加速下降，2013-2017年下降较慢。内陆的质量变化明显小于沿海地区的质量变化，尤其是在东南、西南和西北地区。GRACE 和 SMB 减去冰排放 (SMB-D) 的质量平衡估计非常一致。冰排放主要表现为长期趋势，而季节性质量变化主要归因于表面质量过程。GrIS 质量变化主要归因于夏季的质量损失。夏季质量变化与气候变化高度相关。而季节性质量变化主要归因于表面质量过程。GrIS 质量变化主要归因于夏季的质量损失。夏季质量变化与气候变化高度相关。而季节性质量变化主要归因于表面质量过程。GrIS 质量变化主要归因于夏季的质量损失。夏季质量变化与气候变化高度相关。