摘要
大气海洋的非潮汐高频质量变化对GRACE时变地球重力场反演具有重要的影响.本文综合运用谱域分析、低阶项比较、空域分析、主成分分析以及时变重力场模型反演的方法,对GFZ发布的AOD1B RL06和RL07产品的大气部分、海洋部分以及大气海洋部分进行了深入系统的对比研究.结果表明两组产品在谱域的差异较小,且差异主要体现在海洋部分,但从空域的对比结果来看海洋部分的等效水高差异较大且达到分米级.基于RL06和RL07反演的60阶时变重力场模型差异较小,在谱域上的差异主要集中在中高阶次.两组时变模型验后KBRR残差的RMS差异小于3.912 nm/s(相关系数:0.999);但基于RL07产品计算的KBRR残差普遍更小,证明了RL07在反演时变地球重力场模型中的微弱优势.
The high-frequency mass variations of the atmosphere and oceans have significant impacts on the inversion of time-variable Earth gravity fields using GRACE.This paper comprehensively compares and analyzes the atmospheric and oceanic components,as well as their combination,of the AOD1B RL06 and RL07 products released by GFZ using methods including spectral domain analysis,comparison of low-order terms,spatial analysis,principal component analysis,and inversion of time-variable gravity field models.The results show that the differences between the two sets of products in the spectral domain are relatively small,with the main differences being reflected in the oceanic component.However,the comparison results in the spatial domain indicate significant differences in the equivalent water heights of the oceanic component,reaching the decimeter level.The differences between the 60th order time-variable gravity field models inverted based on RL06 and RL07 are relatively small,with differences in the spectral domain mainly concentrated in medium to high orders.The RMS differences of the KBRR residuals after validation for both sets of time-variable models are less than 3.912 nm/s(correlation coefficient:0.999).However,the KBRR residuals computed based on RL07 products are generally smaller,demonstrating the slight advantage of RL07 in the inversion of time-variable Earth gravity field models.
作者
刘充
游为
张佳辉
万祥禹
LIU Chong;YOU Wei;ZHANG JiaHui;WAN XiangYu(Southwest Jiaotong University School of Earth Sciences and Engineering,Chengdu 611756,China)
出处
《地球物理学进展》
北大核心
2025年第5期1890-1904,共15页
Progress in Geophysics
基金
国家自然科学基金(42474005,42174014,41974013)资助。
