A New Combined Terrestrial Water Storage Change Model Based on GRACE Satellite Gravimetry

被引：0
|
作者：
Li Z. [1 ,2 ]
Lu Y. [1 ]
Jiang W. [1 ,2 ]
Chen Q. [1 ,2 ]
Chen H. [2 ,3 ]
Ye S. [1 ]
Lai S. [4 ]
机构：
[1] GNSS Research Center, Wuhan University, Wuhan
[2] Hubei Luojia Laboratory, Wuhan
[3] School of Geodesy and Geomatics, Wuhan University, Wuhan
[4] Jiangxi Natural Resources Surveying, Mapping and Monitoring Institute, Nanchang
来源：
Wuhan Daxue Xuebao (Xinxi Kexue Ban)/Geomatics and Information Science of Wuhan University | 2023年 / 48卷 / 07期
关键词：
combined new model; GLDAS; GRACE time‑variable gravity field; MERRA-land; terrestrial water storage change;
D O I：
10.13203/j.whugis20230201
中图分类号：
学科分类号：
摘要：
Objectives: Satellite gravity field data can be used to monitor global terrestrial water storage changes and address common challenges such as climate change, disaster prevention and mitigation, etc. Several time-variable gravity models derived from gravity recovery and climate experiment (GRACE) mis‑ sion have been released internationally. However, there are differences between those models provided by different institutions, and the accuracies are also uneven. The combination of terrestrial water storage change (TWSC) based on different satellite gravity field products would help to maximize the strengths and avoid weaknesses, so as to improve the accuracy of TWSC. Methods: Variance component estimation, en‑ tropy weight method (EWM) and coefficient of variation method are used to carry out the combination analy‑ sis on TWSC inverted from five GRACE satellite gravity field models. Results: The results show that all the three combined TWSC models can significantly reduce the discrepancies between time-variable gravity field inverted TWSC, and the signal-to-noise ratio has been improved by about 58% compared to Jet Pro‑ pulsion Laboratory (JPL) model. The maximum difference in global TWSC trends before and after combi‑ nation decreases from 0.011 cm/month to 0.001 cm/month, while the maximum amplitude difference de‑ creases from 0.95 cm/month to 0.21 cm/month. At a spatial resolution of 1° × 1°, the difference in stan‑ dard deviation of TWSC at latitude and longitude directions decreases from over 20 cm2 to less than 3 cm2. The correlation between the EWM combined TWSC model and hydrological model also improves by up to about 50% compared with that between the JPL independent model and hydrological model. Conclusions: The combined method can effectively suppress noise and significantly improve the accuracy of TWSC re‑ sults, hence can perform as a new mode for high-precision time-variable gravity field applications to pro‑ vide more reliable data support for terrestrial water storage inversions. © 2023 Wuhan University. All rights reserved.
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页码：1180 / 1191
页数：11
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