Increased Low Degree Spherical Harmonic Influences on Polar Ice Sheet Mass Change Derived from GRACE Mission

Increased Low Degree Spherical Harmonic Influences on Polar Ice Sheet Mass Change Derived from GRACE Mission
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GRACE 任务对极地冰盖质量变化的低次球谐波影响增加

DOI:
10.3390/rs12244178
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发表时间:
2020-12
期刊:
影响因子:
5
通讯作者:
Zhang Yu
Zhang Yu
中科院分区:
工程技术2区
文献类型:
--
作者:
Su Xiaoli;Guo Junyi;Shum C. K.;Luo Zhicai;Zhang Yu

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用卫星激光测距(SLR)数据和包括一级项的数据代替重力恢复和气候实验(GRACE)每月重力场解的C20估计,已成为卫星重力场界适当科学应用的标准程序。在这里,我们评估了一级项、基于slr的C20和C30估计值对grace导出的极地冰盖质量变化的影响。我们报告说,为GRACE Release 06 (RL06)数据推荐的一级条件对格陵兰岛和南极冰盖的质量趋势估计的影响是GRACE RL05数据的2.5倍。GRACE技术说明14 (TN14)中最新推荐的C20解决方案与TN11和TN07中的解决方案相比,对冰盖质量趋势的绝对值估计影响超过50%。基于slr的C30替代对南极冰盖质量变化有一定影响,主要取决于研究周期的长短。该研究强调,低次球谐波的可靠解对于精确地从卫星重力测量中获得冰盖质量平衡至关重要。
Replacing estimates of C20 from the Gravity Recovery and Climate Experiment (GRACE) monthly gravity field solutions by those from satellite laser ranging (SLR) data and including degree one terms has become a standard procedure for proper science applications in the satellite gravimetry community. Here, we assess the impact of degree one terms, SLR-based C20 and C30 estimates on GRACE-derived polar ice sheet mass variations. We report that degree one terms recommended for GRACE Release 06 (RL06) data have an impact of 2.5 times more than those for GRACE RL05 data on the mass trend estimates over the Greenland and the Antarctic ice sheets. The latest recommended C20 solutions in GRACE Technical Note 14 (TN14) affect the mass trend estimates of ice sheets in absolute value by more than 50%, as compared to those in TN11 and TN07. The SLR-based C30 replacement has some impact on the Antarctic ice sheet mass variations, mainly depending on the length of the study period. This study emphasizes that reliable solutions of low degree spherical harmonics are crucial for accurately deriving ice sheet mass balance from satellite gravimetry.
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