Spatial and temporal Antarctic Ice Sheet mass trends, glacio-isostatic adjustment, and surface processes from a joint inversion of satellite altimeter, gravity, and GPS data.
Spatial and temporal Antarctic Ice Sheet mass trends, glacio-isostatic adjustment, and surface processes from a joint inversion of satellite altimeter, gravity, and GPS data.
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DOI：
10.1002/2015jf003550
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发表时间：
2016-02
期刊：
影响因子：
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通讯作者：
Bamber JL
中科院分区：
文献类型：
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作者：
Martín-Español A;Zammit-Mangion A;Clarke PJ;Flament T;Helm V;King MA;Luthcke SB;Petrie E;Rémy F;Schön N;Wouters B;Bamber JL
我们根据2003年至2013年期间卫星测高、重力测量和弹性校正GPS数据的统计反演，提出了南极冰盖的时空质量平衡趋势。我们的方法同时确定了冰动力学的年度趋势、表面物质平衡和异常，以及冰川均衡调整的时间不变解决方案，同时在很大程度上保持与正演模式无关。我们发现，在2003年至2013年期间，南极洲一直在以−84±22GT年−1的速度失去质量，−111±13GT年−1的持续负平均动态不平衡趋势。南极洲西部是−112±10GT年−1的最大贡献者，主要是由于流入阿蒙森海海湾的冰川减薄速率高所致。南极半岛在过去十年中经历了质量损失的急剧增加，平均速率为−28±7 GT/yr−1，在2010年左右南极南部半岛不稳定之后，最近几年的质量损失值明显更高。由于表面质量平衡异常的积极趋势，东南极的显著质量增加56±18GT/年−1部分补偿了总质量损失。对于南极冰盖，冰川动力学、小型冰盖和全球冰盖的同时估计，南极冰盖的总质量损失为−84×104GT/年−1 2003年至2013年，西南极是由南极冰盖冰川减薄速度较快引发的最大贡献者
We present spatiotemporal mass balance trends for the Antarctic Ice Sheet from a statistical inversion of satellite altimetry, gravimetry, and elastic‐corrected GPS data for the period 2003–2013. Our method simultaneously determines annual trends in ice dynamics, surface mass balance anomalies, and a time‐invariant solution for glacio‐isostatic adjustment while remaining largely independent of forward models. We establish that over the period 2003–2013, Antarctica has been losing mass at a rate of −84 ± 22 Gt yr−1, with a sustained negative mean trend of dynamic imbalance of −111 ± 13 Gt yr−1. West Antarctica is the largest contributor with −112 ± 10 Gt yr−1, mainly triggered by high thinning rates of glaciers draining into the Amundsen Sea Embayment. The Antarctic Peninsula has experienced a dramatic increase in mass loss in the last decade, with a mean rate of −28 ± 7 Gt yr−1 and significantly higher values for the most recent years following the destabilization of the Southern Antarctic Peninsula around 2010. The total mass loss is partly compensated by a significant mass gain of 56 ± 18 Gt yr−1 in East Antarctica due to a positive trend of surface mass balance anomalies. Simultaneous estimate of ice dynamics, SMB and GIA for the Antarctic Ice Sheet, The total mass loss of the AIS is −84 ± 24 Gt yr−1 over 2003–2013 West Antarctica is the largest contributor triggered by high thinning rates of glaciers in the ASE