The variation of terrestrial water storage in north China based on GRACE gravity satellite
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Abstract:
The variation of terrestrial water storage from 2003 to 2013 was analyzed using GRACE( Gravity Recovery And Climate Experiment) satellite data and then compared with CPC( Climate Prediction Center) , GLDAS( Global Land Data Assimilation System) hydrological models in North China. The correlation coefficients of GRACE, CPC and GLDAS are 0. 679 and 0. 817, respectively, while GRACE has a str onger correlation with GLDAS. The results showed that: terrestrial water storage and groundwater decreased at a rate of - 1. 8 km3 / a and - 1. 3 km3/ s from 2003 to 2013 after deducting surface water as a whole. It's worth noting that the variation of groundwater presented different stages: increased from 2003 to 2004 and declined from 2005 to 2013, the downward trend had slowed since 2010. GRACE and hydrological models showed that equivalent water height was significantly smaller than the long-term average in 2006 and 2009. The month corresponding to the GRACE maximum was unusual in the two years, compared with the results of the National Bureau of Statistics o f China, the total water resources, surface waterresources, and groundwater resources in the valley area, which corresponded to the natural disasters occurred in those two years.
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