Investigating terrestrial water storage changes in Southwest China by integrating GNSS and GRACE/GRACE-FO observations
Study region: Southwest China. Study focus: Terrestrial water storage (TWS) changes estimated from the Global Navigation Satellite System (GNSS) and Gravity Recovery and Climate Experiment missions (GRACE/GRACE-FO) are critical data sets for hydrological studies. To obtain a broader and unified spat...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-08-01
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| Series: | Journal of Hydrology: Regional Studies |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214581823001441 |
| _version_ | 1797796456185200640 |
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| author | Xinghai Yang Linguo Yuan Zhongshan Jiang Miao Tang Xianjie Feng Changhai Li |
| author_facet | Xinghai Yang Linguo Yuan Zhongshan Jiang Miao Tang Xianjie Feng Changhai Li |
| author_sort | Xinghai Yang |
| collection | DOAJ |
| description | Study region: Southwest China. Study focus: Terrestrial water storage (TWS) changes estimated from the Global Navigation Satellite System (GNSS) and Gravity Recovery and Climate Experiment missions (GRACE/GRACE-FO) are critical data sets for hydrological studies. To obtain a broader and unified spatiotemporal scale than a single method, we designed two improved joint inversion methods (JIMs). The joint inversion method 1 and 2 (JIM1 and JIM2) are based on GRACE/GRACE-FO-derived virtual stations and 3-degree mascons from Jet Propulsion Laboratory, respectively. We focused on investigating TWS changes in Southwest China using JIM1 and JIM2 New hydrological insight for the region: The synthetic test showed that JIM1 and JIM2 had lower root-mean-square-errors than a GNSS-Only inversion method (GNSS-IM), with reductions of 22% and 37%, respectively, confirming their feasibility. The results of JIMs using actual GNSS and GRACE/GRACE-FO data showed that the area-averaged JIMs-TWS estimates were consistent with GRACE/GRACE-FO-TWS and GNSS-IM-TWS, but JIM2-TWS was overfit to GNSS-IM-TWS. Then, we utilized JIM1-TWS to investigate hydro-climate relationships and quantify drought events. The results revealed a strong agreement between JIM1-dTWS/dt and precipitation-evapotranspiration-runoff with a correlation coefficient of 0.89. Precipitation contributed the most to TWS changes. Furthermore, three hydrological drought events were detected, with the third event being the most severe, lasting for 20 months, resulting in a total TWS loss of − 501 km3, and being categorized as an exceptional drought. |
| first_indexed | 2024-03-13T03:33:21Z |
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| id | doaj.art-5da4d80b5406408fba7cc500d5a8e9a8 |
| institution | Directory Open Access Journal |
| issn | 2214-5818 |
| language | English |
| last_indexed | 2024-03-13T03:33:21Z |
| publishDate | 2023-08-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Hydrology: Regional Studies |
| spelling | doaj.art-5da4d80b5406408fba7cc500d5a8e9a82023-06-24T05:16:36ZengElsevierJournal of Hydrology: Regional Studies2214-58182023-08-0148101457Investigating terrestrial water storage changes in Southwest China by integrating GNSS and GRACE/GRACE-FO observationsXinghai Yang0Linguo Yuan1Zhongshan Jiang2Miao Tang3Xianjie Feng4Changhai Li5Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, ChinaFaculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China; Corresponding author.School of Geospatial Engineering and Science, Sun Yat-Sen University, Zhuhai 519082, ChinaFaculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, ChinaInstitute of International Rivers and Eco-Security, Yunnan University, Kunming 650091, ChinaFaculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, ChinaStudy region: Southwest China. Study focus: Terrestrial water storage (TWS) changes estimated from the Global Navigation Satellite System (GNSS) and Gravity Recovery and Climate Experiment missions (GRACE/GRACE-FO) are critical data sets for hydrological studies. To obtain a broader and unified spatiotemporal scale than a single method, we designed two improved joint inversion methods (JIMs). The joint inversion method 1 and 2 (JIM1 and JIM2) are based on GRACE/GRACE-FO-derived virtual stations and 3-degree mascons from Jet Propulsion Laboratory, respectively. We focused on investigating TWS changes in Southwest China using JIM1 and JIM2 New hydrological insight for the region: The synthetic test showed that JIM1 and JIM2 had lower root-mean-square-errors than a GNSS-Only inversion method (GNSS-IM), with reductions of 22% and 37%, respectively, confirming their feasibility. The results of JIMs using actual GNSS and GRACE/GRACE-FO data showed that the area-averaged JIMs-TWS estimates were consistent with GRACE/GRACE-FO-TWS and GNSS-IM-TWS, but JIM2-TWS was overfit to GNSS-IM-TWS. Then, we utilized JIM1-TWS to investigate hydro-climate relationships and quantify drought events. The results revealed a strong agreement between JIM1-dTWS/dt and precipitation-evapotranspiration-runoff with a correlation coefficient of 0.89. Precipitation contributed the most to TWS changes. Furthermore, three hydrological drought events were detected, with the third event being the most severe, lasting for 20 months, resulting in a total TWS loss of − 501 km3, and being categorized as an exceptional drought.http://www.sciencedirect.com/science/article/pii/S2214581823001441Terrestrial water storageGNSS vertical displacementGRACE/GRACE-FO mascon solutionsJoint inversionABIC |
| spellingShingle | Xinghai Yang Linguo Yuan Zhongshan Jiang Miao Tang Xianjie Feng Changhai Li Investigating terrestrial water storage changes in Southwest China by integrating GNSS and GRACE/GRACE-FO observations Journal of Hydrology: Regional Studies Terrestrial water storage GNSS vertical displacement GRACE/GRACE-FO mascon solutions Joint inversion ABIC |
| title | Investigating terrestrial water storage changes in Southwest China by integrating GNSS and GRACE/GRACE-FO observations |
| title_full | Investigating terrestrial water storage changes in Southwest China by integrating GNSS and GRACE/GRACE-FO observations |
| title_fullStr | Investigating terrestrial water storage changes in Southwest China by integrating GNSS and GRACE/GRACE-FO observations |
| title_full_unstemmed | Investigating terrestrial water storage changes in Southwest China by integrating GNSS and GRACE/GRACE-FO observations |
| title_short | Investigating terrestrial water storage changes in Southwest China by integrating GNSS and GRACE/GRACE-FO observations |
| title_sort | investigating terrestrial water storage changes in southwest china by integrating gnss and grace grace fo observations |
| topic | Terrestrial water storage GNSS vertical displacement GRACE/GRACE-FO mascon solutions Joint inversion ABIC |
| url | http://www.sciencedirect.com/science/article/pii/S2214581823001441 |
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