Evaluating the weekly changes in terrestrial water storage estimated by two different inversion strategies in the Amazon River Basin

IF 2.8 4区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Geodesy and Geodynamics Pub Date : 2023-11-01 DOI:10.1016/j.geog.2023.07.007

Bo Zhong , Xianpao Li , Qiong Li , Jiangtao Tan , Xianyun Dai

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Abstract

In this study, we estimated the weekly Gravity Recovery and Climate Experiment (GRACE) spherical harmonic (SH) solutions and regional mascon solutions using GRACE-based Geopotential Difference (GPD) data and investigated their abilities in retrieving terrestrial water storage (TWS) changes over the Amazon River Basin (ARB) from January 2003 to February 2013. The performance of the weekly GPD-SH and GPD-mascon solutions was evaluated by comparing them with the weekly GFZ-SH solutions, Global Land Data Assimilation Systems (GLDAS)-NOAH hydrological model outputs, and monthly GFZ-SH, GPD-SH, and CSR-mascon solutions in the spatio-temporal and spectral domains. The results demonstrate that the weekly GPD-SH and GPD-mascon present good consistency with the weekly GFZ-SH solutions and GLDAS-NOAH estimates in the spatio-temporal domains, but GPD-mascon presents stronger signal amplitudes and more spatial details. The comparison of the monthly average of weekly estimates and monthly solutions demonstrates that the weekly GPD-mascon and GFZ-SH with DDK1 filtering are close to the monthly CSR-mascon and GFZ-SH solutions, respectively. However, the signal amplitudes of TWS changes from GPD-SH and GFZ-SH with 650 km Gaussian filtering are smaller than the monthly solutions, and the corresponding Root Mean Square Errors between the TWS change time series from the monthly average of weekly solutions and monthly estimates are 18.12 mm (GPD-mascon), 18.81 mm (GFZ-SH-DDK1), 24.93 mm (GPD-SH-G650km), and 33.07 mm (GFZ-SH-G650km), respectively. Additionally, the TWS change time series derived from weekly solutions present more high-frequency time-varying information than monthly solutions. Furthermore, the 300 km Gaussian filtering can improve the signal amplitudes of TWS changes from the weekly GPD-SH solutions more than those with 650 km Gaussian filtering, but the corresponding noise level is higher. The weekly GPD-SH and GPD-mascon solutions can extend the application scopes of GRACE and provide good complements to the current GRACE monthly solutions.

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评估亚马逊河流域两种不同反演策略估算的陆地储水量周变化

本文利用基于GRACE的重力恢复与气候实验(GRACE)的周次球谐解(SH)和区域mascon解(GPD)数据，对2003年1月至2013年2月亚马逊河流域(ARB)的TWS变化进行了估算，并研究了它们的反演能力。通过将每周GPD-SH和GPD-mascon方案与每周GFZ-SH方案、全球土地数据同化系统(GLDAS)-NOAH水文模型输出以及每月GFZ-SH、GPD-SH和CSR-mascon方案在时空和光谱域的性能进行比较，评估了GPD-SH和GPD-SH方案的性能。结果表明:每周GPD-SH和GPD-mascon与每周GFZ-SH解和GLDAS-NOAH解在时空域上具有较好的一致性，但GPD-mascon具有更强的信号幅度和更多的空间细节。周估计和月解的月平均值比较表明，DDK1滤波后的周GPD-mascon和GFZ-SH分别接近月度CSR-mascon和GFZ-SH。而经650 km高斯滤波的GPD-SH和GFZ-SH的TWS变化信号幅度小于月解，周解月均值与月估计值的TWS变化时间序列的均方根误差分别为18.12 mm、18.81 mm、24.93 mm和33.07 mm。此外，由周解导出的TWS变化时间序列比月解呈现出更多的高频时变信息。此外，300 km高斯滤波比650 km高斯滤波更能改善周GPD-SH解的TWS变化信号幅度，但相应的噪声水平更高。每周GPD-SH和GPD-mascon解决方案可以扩展GRACE的应用范围，对目前GRACE每月解决方案提供很好的补充。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Geodesy and Geodynamics GEOCHEMISTRY & GEOPHYSICS-

CiteScore

4.40

自引率

4.20%

发文量

566

审稿时长

69 days

期刊介绍： Geodesy and Geodynamics launched in October, 2010, and is a bimonthly publication. It is sponsored jointly by Institute of Seismology, China Earthquake Administration, Science Press, and another six agencies. It is an international journal with a Chinese heart. Geodesy and Geodynamics is committed to the publication of quality scientific papers in English in the fields of geodesy and geodynamics from authors around the world. Its aim is to promote a combination between Geodesy and Geodynamics, deepen the application of Geodesy in the field of Geoscience and quicken worldwide fellows'' understanding on scientific research activity in China. It mainly publishes newest research achievements in the field of Geodesy, Geodynamics, Science of Disaster and so on. Aims and Scope: new theories and methods of geodesy; new results of monitoring and studying crustal movement and deformation by using geodetic theories and methods; new ways and achievements in earthquake-prediction investigation by using geodetic theories and methods; new results of crustal movement and deformation studies by using other geologic, hydrological, and geophysical theories and methods; new results of satellite gravity measurements; new development and results of space-to-ground observation technology.