Interannual variations of the mass balance of the Antarctica and Greenland ice sheets from GRACE
Interannual variations of the mass balance of the Antarctica and Greenland ice sheets from GRACE
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DOI：
10.1016/j.gloplacha.2006.06.003
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发表时间：
2006-09
影响因子：
3.9
通讯作者：
G. Ramillien;A. Lombard;A. Cazenave;E. Ivins;M. Llubes;F. Rémy;R. Biancale
中科院分区：
文献类型：
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作者：
G. Ramillien;A. Lombard;A. Cazenave;E. Ivins;M. Llubes;F. Rémy;R. Biancale
我们提出了一个新的估计西/东南极洲和格陵兰冰盖的GRACE最近一段时间（2002年7月至2005年3月）的质量平衡，并计算相应的全球平均海平面的贡献。我们使用新的GRACE大地水准面解决方案提供的Géodésie Spatiale（GRGS/CNES），在分辨率为10400公里，采样间隔为10天。在这三个地区，观察到显着的年际变化，我们近似为线性趋势在短时间内的分析。在格陵兰，观测到的表观总体积损失为119 +/−10 cu km/yr。就南极洲冰盖而言，双峰现象很明显，西部冰盖的水量损失为88 +/−10 cu km/年，东部冰盖的水量增加为72 +/−20 cu km/年。这些GRACE结果受到陆地水文污染和冰川均衡调整（GIA）的固体地球自末次冰消期。我们纠正土地水文污染（使用全球水文模型）和GIA使用ICE-4G模型格陵兰岛和南极洲的IJ 05模型。经陆地水文污染和GIA校正后，GRACE的体积率分别为格陵兰岛、南极洲西部和南极洲东部的−129 +/−15 cu km/yr、−107 +/−23 cu km/yr和+67 +/−28 cu km/yr。就海平面上升而言，在研究的时间间隔内，基于GRACE的冰盖贡献为格陵兰+0.36 +/-0.04 mm/yr，南极洲西部+0.30 +/-0.06 mm/yr，南极洲东部-0.19 +/-0.07 mm/yr。因此，南极洲在这一短时间内对海平面的总贡献略为正值（+0.11 +/-0.09毫米/年）。这些冰盖共同导致海平面上升0.47 +/-0.1毫米/年。这里报告的结果是在定性协议与最近的估计的质量平衡的冰盖的基础上GRACE和那些基于其他遥感观测。由于GRACE数据的采样时间跨度很短，尚不可能区分年际振荡和与气候变化相关的长期趋势。
We propose a new estimate of the mass balance of the West/East Antarctica and Greenland ice sheets from GRACE for the recent period (July 2002–March 2005) and compute the corresponding contribution to the global mean sea level. We use new GRACE geoid solutions provided by the Groupe de Recherche en Géodésie Spatiale (GRGS/CNES), at the resolution of ∼400 km and sampled at 10-day interval. In the three regions, significant interannual variations are observed, which we approximate as linear trends over the short time span of analysis. Over Greenland, an apparent total volume loss of 119 +/−10 cu km/yr water is observed. For the Antarctica ice sheet, a bimodal behaviour is apparent, with volume loss amounting to 88 +/−10 cu km/yr water in the West, and increase in the East amounting to 72 +/−20 cu km/yr water. These GRACE results are affected by land hydrology contamination and glacial isostatic adjustment (GIA) of the solid Earth since last deglaciation. We correct for both land hydrology contamination (using a global hydrological model) and GIA using the ICE-4G model for Greenland and the IJ05 model for Antarctica. Corrected for both land hydrology contamination and GIA, GRACE volume rates are −129 +/−15 cu km/yr, −107 +/−23 cu km/yr and +67 +/−28 cu km/yr for Greenland, West Antarctica and East Antarctica respectively. In terms of sea level rise, the GRACE-based ice sheets contributions are +0.36 +/−0.04 mm/yr for Greenland, +0.30 +/−0.06 mm/yr for West Antarctica and −0.19 +/−0.07 for East Antarctica for the time interval of study. The total Antarctica contribution to sea level over this short time span is thus slightly positive (+0.11 +/−0.09 mm/yr). The ice sheets together contribute to a sea level rise of 0.47 +/−0.1 mm/yr. The results reported here are in qualitative agreement with recent estimates of the mass balance of the ice sheets based on GRACE and with those based upon other remote sensing observations. Due to the very short sampling time span for which the GRACE data are available, it is not yet possible to distinguish between interannual oscillations and long-term trend associated with climate change.