Key Points: @bullet Consistent Method for Estimating Mass Balances from Grace @bullet Mascon Technique @bullet Evaluate Systematic Errors Gia Correction a Mascon Approach to Assess Ice Sheet and Glacier Mass Balances and Their Uncertainties from Grace Dat
Key Points: @bullet Consistent Method for Estimating Mass Balances from Grace @bullet Mascon Technique @bullet Evaluate Systematic Errors Gia Correction a Mascon Approach to Assess Ice Sheet and Glacier Mass Balances and Their Uncertainties from Grace Dat
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通讯作者：
E. Schrama;B. Wouters;R. Rietbroek;E. Schrama;B. Wouters;R. Rietbroek
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作者：
E. Schrama;B. Wouters;R. Rietbroek;E. Schrama;B. Wouters;R. Rietbroek
（2014年），一个mascon方法来评估冰盖和冰川质量平衡及其不确定性的GRACE数据，摘要本文的目的是评估格陵兰冰盖（GrIS）的质量变化，南极洲冰盖，陆地冰川和冰帽与全球mascon方法，产生每月的质量变化在10,242 mascon。该方法的输入是2003年2月至2013年6月期间收集的重力恢复和气候实验系统的2级数据，并对其进行了一些校正。通过基于不同冰史和流变地球模型参数的一系列模型的冰川均衡调整（GIA）校正，我们发现格陵兰岛的质量损失为−278 ± 19 Gt/年。尽管GrIS的质量平衡似乎对GIA建模不确定性不太敏感，但南极洲的质量平衡却并非如此。最近改进了南极洲的冰史模型，并利用最新的历史冰高数据集和全球定位系统时间序列生成了新的全球影响评估模型。我们研究了两个新的GIA模型对南极洲的影响，发现-92 ± 26 Gt/yr，这是基于ICE-5G的GIA模型获得的结果的一半，其中最大的GIA模型差异发生在南极洲东部。陆地冰川和冰盖的质量平衡目前为-162 ± 10 Gt/yr。借助新的南极GIA模型，我们评估了质量对平均海平面的贡献为1.47 ± 0.09 mm/yr或532 ± 34 Gt/yr，这大约是从验潮仪和卫星测高获得的全球海平面上升信号的一半。
(2014), A mascon approach to assess ice sheet and glacier mass balances and their uncertainties from GRACE data, Abstract The purpose of this paper is to assess the mass changes of the Greenland Ice Sheet (GrIS), Ice Sheets over Antarctica, and Land glaciers and Ice Caps with a global mascon method that yields monthly mass variations at 10,242 mascons. Input for this method are level 2 data from the Gravity Recovery and Climate Experiment (GRACE) system collected between February 2003 and June 2013 to which a number of corrections are made. With glacial isostatic adjustment (GIA) corrections from an ensemble of models based on different ice histories and rheologic Earth model parameters, we find for Greenland a mass loss of −278 ± 19 Gt/yr. Whereas the mass balances for the GrIS appear to be less sensitive to GIA modeling uncertainties, this is not the case with the mass balance of Antarctica. Ice history models for Antarctica were recently improved, and updated historic ice height data sets and GPS time series have been used to generate new GIA models. We investigated the effect of two new GIA models for Antarctica and found −92 ± 26 Gt/yr which is half of what is obtained with ICE-5G-based GIA models, where the largest GIA model differences occur on East Antarctica. The mass balance of land glaciers and ice caps currently stands at −162 ± 10 Gt/yr. With the help of new GIA models for Antarctica, we assess the mass contribution to the mean sea level at 1.47 ± 0.09 mm/yr or 532 ± 34 Gt/yr which is roughly half of the global sea level rise signal obtained from tide gauges and satellite altimetry.