冰川均衡调整模型对全球质量变化的影响分析

Impact of Glacial Isostatic Adjustment Model on Global Mass Changes

利用国际上常用的8个冰川均衡调整(GIA)模型分别对利用卫星重力(GRACE)数据解算的2005~2014年全球质量变化趋势进行GIA改正。在对南极地区进行改正时发现,ICE-6G_C、ICE-6G_D和IJ05这3种模型的改正值相近;在对全球海水质量变化趋势进行改正时发现,不同改正模型对全球海水质量变化影响的均值都小于-2.0 mm/a;对比陆地水及冰盖对海水质量变化趋势的贡献,同时联合卫星测高和Argo温盐数据集进一步验证发现,Paulson07、GW13和ICE-6G_D模型对全球海水质量改正效果较好。综合整个陆地和海洋的分析结果来看,ICE-6G_D模型更适用于全球质量变化趋势的调整。

Based on 8 glacial isostatic adjustment(GIA)models commonly used in the world,we calculate the global mass change trends from 2005 to 2014 using GRACE data corrected by GIA.When correcting in Antarctic region,the correction values of the three models:ICE-6G_C,ICE-6G_D and IJ05,are similar.When correcting the global ocean mass changes,the mean value of the impact of different correction models on global ocean mass changes is below-2.0 mm/a.We contrast the contribution of land water and ice sheet to the trend of ocean mass changes,and combining satellite altimetry and Argo data to further verify that the Paulson07,Geruo13 and ICE-6G_D models are relatively suitable for global ocean mass correction.Integrating the entire land and ocean,ICE-6G_D model is more suitable for adjusting the global mass change.