利用时变重力场确定2003-2015年格陵兰岛和南极冰盖质量变化
首发时间:2017-11-28
摘要:格陵兰岛和南极冰盖的变化对全球海平面变化上升具有重要贡献。本文利用2003年1月至2015年12月的GRACE卫星时变重力场模型,同时替换一阶项和C20项,采用300km高斯滤波和去条纹滤波,并分析了冰后回弹模型改正对计算结果的影响,最后确定了格陵兰岛和南极冰盖范围内1 ×1 等效水高变化,进而推算出其冰川消融量对海平面上升的贡献。结果表明,两极冰川存在明显的消融现象,对应海平面变化的贡献量分别为+0.66±0.02mm/a和+0.28±0.04mm/a,与国际最新研究成果相比,具有很好的一致性。?????
关键词: 大地测量技术 GRACE时变重力场 格陵兰岛 南极 海平面变化
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The mass changes in Greenland and Antarctica ice sheet over 2003-2015 based on time-varying gravity field
Abstract:Changes in Greenland and Antarctica ice sheet make a significant contribution to global sea level rise. Based on the GRACE satellite time-varying gravity field model over 2003.1.-2015.12., this paper replaced the first-order term and C20 term, used Gaussian filter of 300 km and deblocking filter, and deduced effects of GIA corrections to the calculation results, finally determined the 1 × 1 equivalent water height change in Greenland and Antarctica ice sheet. Results show that there are obvious ablation phenomena in two polar glaciers, and contributions to sea level change are +0.66±0.02mm/a and +0.28±0.04mm/a respectively, which are in good agreement with the latest international research results .
Keywords: geodetic technology GRACE time-varying gravity field Greenland Antarctica sea level changet
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