Terrestrial water variations in the North China Plain revealed by the GRACE mission  

作　　者：SU XiaoLi PING JinSong YE QiXin 

机构地区：[1]Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China [2]Shanghai Center for Satellite Remote-sensing and Application, Shanghai 201100, China [3]Graduate University of Chinese Academy of Sciences, Beijing 100049, China

出　　处：《Science China Earth Sciences》2011年第12期1965-1970,共6页中国科学（地球科学英文版）

基　　金：supported by National High Technology Program of China (Grant No. 2010AA12206);National Natural Science Foundation of China (Grant No. 10973031)

摘　　要：Using eight years of time-variant gravity measurements from the GRACE gravity satellite mission, we estimate monthly terrestrial water storage variations in the North China Plain between August 2002 and August 2010. We find that during this period, the water storage is not constant but accelerate at a rate of -1.1 cm/yr over time. The study confirms that the relatively long-term trend of water storage in the North China Plain (by 13-point moving average) is consistent well with that by linear fitting. Two hydrological models, CPC and GLDAS, are adopted in calculating surface water variations, with results indicating that they agree with those of GRACE. Furthermore, rates of -0.6 cm/yr for surface water variations and -0.5 cm/yr for groundwater variations are found in the North China Plain during the study period. Decrease of rainfall and the groundwater over-exploitation are possibly the main causes for groundwater depletion in the North China Plain. The results will be helpful for better understanding climatic changes and provide reference for the management of water resources and the establishment of policies on preventing and alleviating natural hazards.Using eight years of time-variant gravity measurements from the GRACE gravity satellite mission, we estimate monthly terrestrial water storage variations in the North China Plain between August 2002 and August 2010. We find that during this pe- riod, the water storage is not constant but accelerate at a rate of-1.1 cm/yr over time. The study confirms that the relatively long-term trend of water storage in the North China Plain （by 13-point moving average） is consistent well with that by linear fitting. Two hydrological models, CPC and GLDAS, are adopted in calculating surface water variations, with results indicating that they agree with those of GRACE. Furthermore, rates of -0.6 cm/yr for surface water variations and -0.5 cm/yr for groundwater variations are found in the North China Plain during the study period. Decrease of rainfall and the groundwater over-exploitation are possibly the main causes for groundwater depletion in the North China Plain. The results will be helpful for better understanding climatic changes and provide reference for the management of water resources and the establishment of policies on preventing and alleviating natural hazards.

关 键 词：GRACE gravity measurements GROUNDWATER the North China Plain 

分 类 号：P223[天文地球—大地测量学与测量工程] S512.11[天文地球—测绘科学与技术]