Abstract:A new GLDAS_NOAH_M.2.1 land water model and its old version of GLDAS_NOAH_M.001 from January 2003 and June 2016, totally 162 months, are investigated here with GRACE satellite gravimetry observations to study soil moisture and total mass change in the Qinghai-Tibet plateau. Our result shows that GLDAS_NOAH_M.2.1 has an improved precision in simulating soil moisture change. Here, 6 study regions are divided and in each region these three data sets are used to estimate mass changes, whose correlation coefficient and periodic terms are derived. Compared with GLDAS_NOAH_M.001, GLDAS_NOAH_M.2.1 has a better performance in correlation with GRACE in terms of periodic variations. The correlation between GLDAS_NOAH_M.001 and GRACE is very poor in northern Tibet, while GLDAS_NOAH_M.2.1 has improved this condition. In terms of secular mass change, GLDAS_NOAH_M.2.1 brings a difference at the order of -6.4~4.5 Gt/a in different regions and a total different of -10.4 Gt/a in the main part of Qinghai-Tibet plateau.
QIAN An,YI Shuang,SUN Guangtong et al. GLDAS_NOAH_M.2.1 Hydrological Model and Its Application Analysis in the Qinghai-Tibet Plateau[J]. jgg, 2018, 38(3): 254-259.