New methods estimating the amount of water storage on Earth have evolved over the years. One of them utilizes the gravitational field variation observed from the GRACE satellite. Compared to conventional methods such as water balance analysis, the method makes it simple and straightforward to obtain the terrestrial water storage change (TWSC). Previous studies show that there is a discrepancy between GRACE-based and water balance-based estimates especially in wet periods. Along with precipitation and evapotranspiration, it is common that runoff data needed for the water balance analysis are obtained from GLDAS (Global Land Data Assimilation System). In this study, GLDAS runoff data are replaced with hydrologic simulation results with such anticipation that local geomorphologic and hydrologic characteristics can be better incorporated. In an application to a relatively small basin during a wet period, GLDAS- and simulation-based TWSCs showed values 2.73~3.58 times higher than the GRACE-based estimate. It implies that the GRACE-approach underestimates TWSC during wet periods. It also suggests the need for correction factors to adjust the GRACE-based estimates in the rainy season.
Published in | Journal of Water Resources and Ocean Science (Volume 3, Issue 1) |
DOI | 10.11648/j.wros.20140301.12 |
Page(s) | 5-9 |
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This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited. |
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Copyright © The Author(s), 2014. Published by Science Publishing Group |
GRACE, Terrestrial Water Storage, GLDAS, Hydrologic Simulation
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APA Style
Sang-Il Lee, Jae Young Seo, Sang Ki Lee. (2014). Validation of Terrestrial Water Storage Change Estimates Using Hydrologic Simulation. Journal of Water Resources and Ocean Science, 3(1), 5-9. https://doi.org/10.11648/j.wros.20140301.12
ACS Style
Sang-Il Lee; Jae Young Seo; Sang Ki Lee. Validation of Terrestrial Water Storage Change Estimates Using Hydrologic Simulation. J. Water Resour. Ocean Sci. 2014, 3(1), 5-9. doi: 10.11648/j.wros.20140301.12
AMA Style
Sang-Il Lee, Jae Young Seo, Sang Ki Lee. Validation of Terrestrial Water Storage Change Estimates Using Hydrologic Simulation. J Water Resour Ocean Sci. 2014;3(1):5-9. doi: 10.11648/j.wros.20140301.12
@article{10.11648/j.wros.20140301.12, author = {Sang-Il Lee and Jae Young Seo and Sang Ki Lee}, title = {Validation of Terrestrial Water Storage Change Estimates Using Hydrologic Simulation}, journal = {Journal of Water Resources and Ocean Science}, volume = {3}, number = {1}, pages = {5-9}, doi = {10.11648/j.wros.20140301.12}, url = {https://doi.org/10.11648/j.wros.20140301.12}, eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.wros.20140301.12}, abstract = {New methods estimating the amount of water storage on Earth have evolved over the years. One of them utilizes the gravitational field variation observed from the GRACE satellite. Compared to conventional methods such as water balance analysis, the method makes it simple and straightforward to obtain the terrestrial water storage change (TWSC). Previous studies show that there is a discrepancy between GRACE-based and water balance-based estimates especially in wet periods. Along with precipitation and evapotranspiration, it is common that runoff data needed for the water balance analysis are obtained from GLDAS (Global Land Data Assimilation System). In this study, GLDAS runoff data are replaced with hydrologic simulation results with such anticipation that local geomorphologic and hydrologic characteristics can be better incorporated. In an application to a relatively small basin during a wet period, GLDAS- and simulation-based TWSCs showed values 2.73~3.58 times higher than the GRACE-based estimate. It implies that the GRACE-approach underestimates TWSC during wet periods. It also suggests the need for correction factors to adjust the GRACE-based estimates in the rainy season.}, year = {2014} }
TY - JOUR T1 - Validation of Terrestrial Water Storage Change Estimates Using Hydrologic Simulation AU - Sang-Il Lee AU - Jae Young Seo AU - Sang Ki Lee Y1 - 2014/03/30 PY - 2014 N1 - https://doi.org/10.11648/j.wros.20140301.12 DO - 10.11648/j.wros.20140301.12 T2 - Journal of Water Resources and Ocean Science JF - Journal of Water Resources and Ocean Science JO - Journal of Water Resources and Ocean Science SP - 5 EP - 9 PB - Science Publishing Group SN - 2328-7993 UR - https://doi.org/10.11648/j.wros.20140301.12 AB - New methods estimating the amount of water storage on Earth have evolved over the years. One of them utilizes the gravitational field variation observed from the GRACE satellite. Compared to conventional methods such as water balance analysis, the method makes it simple and straightforward to obtain the terrestrial water storage change (TWSC). Previous studies show that there is a discrepancy between GRACE-based and water balance-based estimates especially in wet periods. Along with precipitation and evapotranspiration, it is common that runoff data needed for the water balance analysis are obtained from GLDAS (Global Land Data Assimilation System). In this study, GLDAS runoff data are replaced with hydrologic simulation results with such anticipation that local geomorphologic and hydrologic characteristics can be better incorporated. In an application to a relatively small basin during a wet period, GLDAS- and simulation-based TWSCs showed values 2.73~3.58 times higher than the GRACE-based estimate. It implies that the GRACE-approach underestimates TWSC during wet periods. It also suggests the need for correction factors to adjust the GRACE-based estimates in the rainy season. VL - 3 IS - 1 ER -