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Open AccessArticle

Comparison of Terrestrial Water Storage Changes Derived from GRACE/GRACE-FO and Swarm: A Case Study in the Amazon River Basin

by 1,2, 2, 1,3,*, 1,4,*, 5 and 6
1
School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China
2
School of Architecture and Civil Engineering, Chengdu University, Chengdu 610106, China
3
MOE Key Laboratory of Fundamental Physical Quantities Measurement & Hubei Key Laboratory of Gravitation and Quantum Physics, PGMF and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
4
Key Laboratory of Geospace Environment Geodesy, Ministry of Education, Wuhan University, Wuhan 430079, China
5
Nanning Exploration & Survey Geoinformation Institute, Nanning 530022, China
6
Key Laboratory of Earthquake Geodesy, Institute of Seismology, China Earthquake Administration, Wuhan 430071, China
*
Authors to whom correspondence should be addressed.
Water 2020, 12(11), 3128; https://doi.org/10.3390/w12113128
Received: 14 September 2020 / Revised: 5 November 2020 / Accepted: 6 November 2020 / Published: 7 November 2020
(This article belongs to the Section Hydrology and Hydrogeology)
The mass changes in the Earth’s surface internally derived from the Gravity Recovery and Climate Experiment (GRACE) and the GRACE Follow-On (GRACE-FO) missions have played an important role in the research of various geophysical phenomena. However, the one-year data gap between these two missions has broken the continuity of this geophysical research. In order to assess the feasibility of using the Swarm time-variable gravity field (TVGF) to bridge the data gap, we compared Swarm with the GRACE/GRACE-FO models in terms of model accuracy, observation noise and inverted terrestrial water storage change (TWSC). The results of the comparison showed that the difference between the degree-error root mean square (RMS) of the two models is small, within degree 10. The correlation between the spherical harmonic coefficients of the two models is also relatively high, below degree 17. The observation noise values of GRACE/GRACE-FO are smaller than those of Swarm. Therefore, the latter model requires a larger filter radius to lower these noise levels. According to the correlation coefficients and the time series map of TWSC in the Amazon River basin, the results of GRACE and Swarm are similar. In addition, the TWSC signals were further analyzed. The long-term trend changes of TWSC derived from GRACE/GRACE-FO and the International Combination Service for Time-variable Gravity Fields (COST-G)-Swarm over the period from December 2013 to May 2020 were −0.72 and −1.05 cm/year, respectively. The annual amplitudes of two models are 15.65 and 15.39 cm, respectively. The corresponding annual phases are −1.36 and −1.33 rad, respectively. Our results verified that the Swarm TVGF has the potential to extract TWSC signals in the Amazon River basin and can serve as a complement to GRACE/GRACE-FO data for detecting TWSC in local areas. View Full-Text
Keywords: GRACE; Swarm; GRACE-FO; Amazon River basin; terrestrial water storage change; time-variable gravity field; data gap GRACE; Swarm; GRACE-FO; Amazon River basin; terrestrial water storage change; time-variable gravity field; data gap
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MDPI and ACS Style

Cui, L.; Song, Z.; Luo, Z.; Zhong, B.; Wang, X.; Zou, Z. Comparison of Terrestrial Water Storage Changes Derived from GRACE/GRACE-FO and Swarm: A Case Study in the Amazon River Basin. Water 2020, 12, 3128. https://doi.org/10.3390/w12113128

AMA Style

Cui L, Song Z, Luo Z, Zhong B, Wang X, Zou Z. Comparison of Terrestrial Water Storage Changes Derived from GRACE/GRACE-FO and Swarm: A Case Study in the Amazon River Basin. Water. 2020; 12(11):3128. https://doi.org/10.3390/w12113128

Chicago/Turabian Style

Cui, Lilu; Song, Zhe; Luo, Zhicai; Zhong, Bo; Wang, Xiaolong; Zou, Zhengbo. 2020. "Comparison of Terrestrial Water Storage Changes Derived from GRACE/GRACE-FO and Swarm: A Case Study in the Amazon River Basin" Water 12, no. 11: 3128. https://doi.org/10.3390/w12113128

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