High resolution Greenland ice sheet inter-annual mass variations combining GRACE gravimetry and Envisat altimetry

High resolution Greenland ice sheet inter-annual mass variations combining GRACE gravimetry and Envisat altimetry
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结合 GRACE 重力测量和 Envisat 高度测量的高分辨率格陵兰冰盖年际质量变化

DOI:
10.1016/j.epsl.2015.04.016
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发表时间:
2015-07
影响因子:
5.3
通讯作者:
Yi Yuchan
Yi Yuchan
中科院分区:
地球科学1区
文献类型:
--
作者:
Su Xiaoli;Shum C. K.;Guo Junyi;Duan Jianbin;Howat Ian;Yi Yuchan

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格陵兰冰盖(GrIS)的年际质量变化对于改进质量平衡估计、验证大气环流模型及其潜在改进具有重要意义。通过结合观测到的年际变化重力恢复和气候实验(GRACE)和环境卫星(Envisat)测高数据在2003年1月至2009年12月期间,我们能够估计名义密度,获得更高分辨率的质量变化,在年际尺度上使用高度计数据的目标。我们发现这两个年际变化之间的高度相关性的顺序为0.7以上的60%的GrIS,特别是在西侧沿着中央冰分水岭。显着的负相关性被发现在东北和东南GrIS的部分地区,负年际变化之间的相关性也被发现从GRACE质量变化和雪深ECMWF再分析在以前的研究。在正相关的区域,估计的名义密度范围为383.7±50.9至596.2±34.1 kg m− 3。我们证明了获得高分辨率的年际质量变化的可行性,在西南GrIS,正相关的区域之一,基于密度校正的Envisat测高,2003-2009。对于负相关区域的存在,一个明确的解释仍然难以捉摸。
Inter-annual mass variations of the Greenland ice sheet (GrIS) are important for improving mass balance estimates, validation of atmospheric circulation models and their potential improvement. By combining observed inter-annual variations from Gravity Recovery and Climate Experiment (GRACE) and Environmental Satellite (Envisat) altimetry data over the period from January 2003 to December 2009, we are able to estimate the nominal density, with the objective of obtaining higher resolution mass changes using altimeter data at the inter-annual scale. We find high correlations between these two inter-annual variations on the order of 0.7 over 60% of the GrIS, in particular over the west side along the central ice divide. Significant negative correlations are found in parts of Northeast and Southeast GrIS, where negative inter-annual variation correlations were also found between mass change from GRACE and snow depth from ECMWF reanalysis in a previous study. In the regions of positive correlation, the estimated nominal densities range from 383.7±50.9 to 596.2±34.1 kg m− 3. We demonstrate the feasibility of obtaining high-resolution inter-annual mass variation over Southwest GrIS, one of the regions with positive correlations, based on density-corrected Envisat altimetry, 2003–2009. A definitive explanation for the existence of regions of negative correlation remains elusive.
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