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干旱区地理 ›› 2018, Vol. 41 ›› Issue (3): 459-471.

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Assessing the applicability of different sources of precipitation data in Aksu River Basin on south slope of Tianshan Mountains

BIAN Wei1,2, CHEN Ya-ning1, LI Zhi1, LI Yu-peng1,2, JIAO Wei1,2, ZHANG Qi-fei1,2   

  1. 1 State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and geography, Chinese Academy of Sciences, Urumqi 830011, Xingjiang, China;
    2 University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2018-01-20 Revised:2018-04-05 Online:2018-05-25

Abstract: Precipitation is an important part of the hydrothermal cycle and climate change research. The accuracy of the precipitation data will affect directly the study on hydrological process at the watershed scale. This paper takes Aksu River Basin, Xinjiang, China, a typical basin on the southern slope of Tianshan Mountains as the research object, based on the observed precipitation data from 2000 to 2015. Firstly, it was interpolated into the grid data with ANUSPLINE interpolation method; then selecting the typical sites, two kinds of grid data sets corresponding to the precipitation of the site were extracted. Finally, by using Pearson correlation coefficient, root mean square error and relative deviation, the applicability of two representative precipitation data sets(TRMM, Tropical Rainfall Measuring Mission and GLDAS, Global Land Data Assimilation System) in Aksu River Basin is compared. The results show as follows:(1) The overall performance of the TRMM3B43 data in Aksu River Basin is better than that of GLDAS-2.(2)The accuracy of the two data sets hits their best at the monthly scale, and the correlation coefficients were 0.938 and 0.901 respectively, and it passes the significance test of 0.01; at the seasonal scale, the fitting of TRMM3B43 data is better than GLDAS-2 data, the spatial consistency for both data sets was good. But both of them show the tendency of overestimating the precipitation in the cold season and underestimating the precipitation in the warm season; at the annual scale, the two data sets show poor performance.(3)In terms of spatial distribution, two data sets can reflect the precipitation pattern which showed a descending trend from northwest to southeast in Aksu River Basin. The two data sets achieved better results for the plain areas than for mountainous areas. They underestimated the precipitation in high altitude and overestimated precipitation in low altitude. This study is of great significance to understand the spatial distribution of precipitation in the basin, to carry out reasonable water resources allocation and runoff simulation of watershed.

Key words: Aksu River Basin, precipitation data, accuracy assessment, spatial and temporal distribution

CLC Number: 

  • P332