Climate Change Research


Evaluation of extreme precipitation indices performance based on NEX-GDDP downscaling data over China

WANG Qian-Zhi1, 2, LIU Kai1, 2, WANG Ming1, 2   

  1. 1 State Key Laboratory of Earth Surface Processes and Resources Ecology, Beijing Normal University,Beijing 100875, China;
    2 Academy of Disaster Reduction and Emergency Management,Faculty of Geographical Science,Beijing Normal University, Beijing 100875, China
  • Received:2020-11-02 Revised:2021-03-04 Online:2021-08-27 Published:2021-08-27

Abstract: Taking the grid daily precipitation data (CN05.1) observed by China surface meteorological stations from 1986 to 2005 as the observation data, the performance of 21 global climate models were evaluated based on the high-resolution downscaling daily dataset NASA Earth Exchange/Global Daily Downscaled Projections (NEX-GDDP) with the resolution of 0.25° (~25 km×25 km). Six intensity indices, annual maximum daily precipitation (RX1D), the largest consecutive precipitation for five days (RX5D), total wet-day precipitation (PRCPTOT), simple daily precipitation intensity (SDII), cumulative precipitation in the 95 and 99 quantiles (R95p, R99p), and five frequency indices, heavy rain days (R50), cumulative precipitation days in the 95 and 99 quantiles (R95T, R99T), consecutive wet days (CWD), consecutive dry days (CDD), were selected for evaluation. The results show that: (1) It is difficult for models to capture the linear variation of extreme precipitation indices. Even for the best performance model, GFDL-ESM2G, only 45% of the simulated indices present the positive correlation with the observation. (2) The performance of models on the climatological means is better. CSIRO-MK3-6-0, NorESM1-M and MRI-CGCM3 have better performance on the intensity indices. Inmcm4, IPSL-CM5A-MR and MIROC5 have better performance on the frequency indices. The three best synthetical performance models are CSIRO-MK3-6-0, inmcm4 and MRI-CGCM3. (3) Considering the performance of 11 extreme precipitation indices in the climatological means and trend, GFDL-ESM2G, CSIRO-MK3-6-0 and Access1-0 have relatively higher performance.

Key words: NEX-GDDP, China, Extreme precipitation, Models evaluation

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