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Elevation and elevation change of Greenland and Antarctica derived from CryoSat-2

机译：来自CryoSat-2的格陵兰和南极洲的高程和高程变化

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This study focuses on the present-day surface elevation of the Greenland andAntarctic ice sheets. Based on 3 years of CryoSat-2 data acquisitionwe derived new elevation models (DEMs) as well as elevation change maps andvolume change estimates for both ice sheets. Here we present the new DEMs andtheir corresponding error maps. The accuracy of the derived DEMs forGreenland and Antarctica is similar to those of previous DEMs obtained bysatellite-based laser and radar altimeters. Comparisons with ICESat data showthat 80% of the CryoSat-2 DEMs have an uncertainty of less than3 m ± 15 m. The surface elevation change rates betweenJanuary 2011 and January 2014 are presented for both ice sheets. We comparedour results to elevation change rates obtained from ICESat data covering thetime period from 2003 to 2009. The comparison reveals that in West Antarcticathe volume loss has increased by a factor of 3. It also shows an anomalousthickening in Dronning Maud Land, East Antarctica which represents a knownlarge-scale accumulation event. This anomaly partly compensates for theobserved increased volume loss of the Antarctic Peninsula and WestAntarctica. For Greenland we find a volume loss increased by a factor of 2.5compared to the ICESat period with large negative elevation changesconcentrated at the west and southeast coasts. The combined volume change ofGreenland and Antarctica for the observation period is estimated to be −503± 107 km3 yr−1. Greenland contributes nearly 75% to thetotal volume change with −375 ± 24 km3 yr−1.
机译：这项研究的重点是格陵兰和南极冰盖的当今表面高度。基于3年的CryoSat-2数据采集，我们得出了两个冰盖的新高程模型（DEM）以及高程变化图和体积变化估计值。在这里，我们介绍了新的DEM及其对应的错误图。格陵兰和南极洲导出的DEM的精度与以前的基于卫星的激光和雷达高度计获得的DEM的精度相似。与ICESat数据的比较表明，80％的CryoSat-2 DEM的不确定度小于3 m±15 m。给出了两个冰盖在2011年1月至2014年1月之间的表面高度变化率。我们将我们的结果与2003年至2009年期间从ICESat数据获得的海拔变化率进行了比较。比较表明，南极洲的体积损失增加了3倍。已知的大规模累积事件。这种异常现象部分补偿了南极半岛和西南极洲观测到的体积损失增加。对于格陵兰岛，我们发现与ICESat时期相比，体积损失增加了2.5倍，而负高程变化集中在西海岸和东南海岸。格陵兰岛和南极洲在观测期内的总体积变化估计为-503±107 km 3 yr -1 。格陵兰以-375±24 km 3 yr -1 贡献了总体积变化的近75％。

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