基于多重权重策略的GRACE月度时间可变重力模型的空间域组合和在里海对模型性能的比较
Wei You1, Ke Qian2, Xiangyu Wan2
1Faculty of Geosciences and Engineering, Southwest Jiaotong University, Chengdu, 611756, China. youwei@swjtu.edu.cn.
将重力恢复和气候实验 (GRACE) 数据结合起来,可以改进时间变量的重力场模型. 新的海洋精度权衡增强了组合解决方案,特别是在整合质量度 (mascon) 数据时.
科学领域:
- 地质测量是指地质测量.
- 气候科学 气候科学
- 地球观测 地球观测
背景情况:
- 重力恢复和气候实验 (GRACE) 任务为地球重力场建模提供了关键数据.
- 各种机构每月根据GRACE观测生成时间可变重力场模型 (TVGFMs).
- 在TVGFM中优化信号噪声比对于准确的气候和地球物理研究至关重要.
研究的目的:
- 通过结合空间领域的解决方案来提高TVGFMs的信号噪声比.
- 评估不同的权重方案,以结合球体系数 (SHC) 和mascon解决方案.
- 确定整合GRACE衍生引力场模型的最佳策略.
主要方法:
- 空间域TVGFM的组合,包括SHC-only和组合的SHC-mascon方法.
- 应用了四个既定的权重方案和一个新的海洋准确度权重方案.
- 组合模型的内部和外部验证,并使用来自卫星高度测量的里海水位变化进行外部验证.
主要成果:
- 使用差异组件估计 (VCE) 权重的SHC组合比单个SHC解决方案有所改善.
- 结合了mascon解决方案的组合模型,表现出更好的性能.
- 海洋准确度权衡方案在整合mascon和shc解决方案方面尤其有效.
结论:
- 模型组合是提高TVGFM性能的有效策略.
- 选择权重策略对于成功集成GRACE解决方案至关重要.
- 对于仅含SHC的组合,建议使用VCE权重,而对于集成mascon和SHC解决方案,则建议使用海洋精度权重.
更多相关视频
12:26Integrating Remote Sensing with Species Distribution Models; Mapping Tamarisk Invasions Using the Software for Assisted Habitat Modeling SAHM
Published on: October 11, 2016
10:46A Method of Trigonometric Modelling of Seasonal Variation Demonstrated with Multiple Sclerosis Relapse Data
Published on: December 9, 2015
相关概念视频
Precipitation Gravimetry
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
Gravimetry: Overview
In precipitation gravimetry, the analyte is converted into a precipitate and weighed. For example, the silver content in a sample can be estimated by precipitating and...
Influence of Earth's Curvature and Atmospheric Refraction on Leveling
Gravity between Spherical Bodies
This assumption can be proved easily by showing that the expression for gravitational potential energy between a hollow sphere of mass (M) and a point mass (m) is the same as it would be for a pair of extended...
Variation in Acceleration due to Gravity near the Earth's Surface
The difference between the true and apparent weights is proportional to the square of the Earth's...
Buoyancy and Stability for Submerged and Floating Bodies
