| Estimating water storage changes and sink terms in Volta Basin from satellite missions简 |
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| 作者姓名： | Vagner G. FERREIRA Samuel Ato ANDAM-AKORFULXiu-feng HE Ru-ya XIAO |
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| 基金项目： | This work was supported by the Fundamental Research Funds for the Central Universities （Grant No 2012B01314）. |
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| 摘 要： | The insufficiency of distributed in situ hydrological measurements is a major challenge for hydrological studies in many regions of the world. Satellite missions such as the Gravity Recovery and Climate Experiment （GRACE） and the Tropical Rainfall Measurement Mission （TRMM） can be used to improve our understanding of water resources beyond surface water in poorly gauged basins. In this study we combined GRACE and TRMM to investigate monthly estimates of evaporation plus runoff （sink terms） using the water balance equation for the period from January 2005 to December 2010 within the Volta Basin. These estimates have been validated by comparison with time series of sink terms （evaporation plus surface and subsurface runoff） from the Global Land Data Assimilation System （GLDAS）. The results, for the period under consideration, show strong agreement between both time series, with a root mean square error （RMSE） of 20.2 ram/month （0.67 mm/d） and a correlation coefficient of 0.85. This illustrates the ability of GRACE to predict hydrological quantities, e.g. evaporation, in the Volta Basin. The water storage change data from GRACE and precipitation data from TRMM all show qualitative agreement, with evidence of basin saturation at approximately 73 mm in the equivalent water column at the annual and semi-annual time scales.
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| 关 键 词： | 卫星任务 河流域 储量变化 GRACE卫星 热带降雨测量卫星 陆面数据同化系统 水槽 均方根误差 |
| 收稿时间： | 10 December 2012 |
Estimating water storage changes and sink terms in Volta Basin from satellite missions |
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| Vagner G. FERREIRA Samuel Ato ANDAM-AKORFULXiu-feng HE Ru-ya XIAO.Estimating water storage changes and sink terms in Volta Basin from satellite missions[J].Water Science and Engineering,2014,7(1):5-16. |
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| Authors: | Vagner G FERREIRA Samuel Ato ANDAM-AKORFUL Xiu-feng HE Ru-ya XIAO |
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| Affiliation: | [1]School of Earth Sciences and Engineering, Hohai University, Nanjing 210098, P. R. China [2]Department of Geomatic Engineering, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana [3]Institute of Satellite Navigation and Spatial Information Systems, Hohai University, Nanjing 210098, P. R. China |
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| Abstract: | The insufficiency of distributed in situ hydrological measurements is a major challenge for hydrological studies in many regions of the world. Satellite missions such as the Gravity Recovery and Climate Experiment (GRACE) and the Tropical Rainfall Measurement Mission (TRMM) can be used to improve our understanding of water resources beyond surface water in poorly gauged basins. In this study we combined GRACE and TRMM to investigate monthly estimates of evaporation plus runoff (sink terms) using the water balance equation for the period from January 2005 to December 2010 within the Volta Basin. These estimates have been validated by comparison with time series of sink terms (evaporation plus surface and subsurface runoff) from the Global Land Data Assimilation System (GLDAS). The results, for the period under consideration, show strong agreement between both time series, with a root mean square error (RMSE) of 20.2 mm/month (0.67 mm/d) and a correlation coefficient of 0.85. This illustrates the ability of GRACE to predict hydrological quantities, e.g. evaporation, in the Volta Basin. The water storage change data from GRACE and precipitation data from TRMM all show qualitative agreement, with evidence of basin saturation at approximately 73 mm in the equivalent water column at the annual and semi-annual time scales. |
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| Keywords: | equivalent water column ＂ evaporation ＂ GLDAS GRACE ＂ hydro-geodesy TRMM |
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