Arid Zone Research ›› 2020, Vol. 37 ›› Issue (1): 74-85.

Previous Articles     Next Articles

Spatiotemporal Variation and Effect of Extreme Precipitation in Inner Mongolia in Recent 60 Years

MA Ai-hua1, YUE Da-peng1, ZHAO Jing-bo1, 2, HU Qian1   

  1. 1. School of Geography and Tourism, Shaanxi Normal University, Xi’an 710119,Shaanxi, China;
    2. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710075,Shaanxi,China

  • Received:2019-01-29 Revised:2019-06-05 Online:2020-01-15 Published:2020-01-15

Abstract: This study was based on the daily precipitation data from 41 meteorological stations in Inner Mongolia from 1958 to 2017. The 9 extreme precipitation indices suggested by WMO, liner trend method, Kriging interpolation, Mann-Kendall test, Morlet wavelet analysis and principle component analysis were used to study the spatiotemporal and periodic changes of extreme precipitation and its disasters in Inner Mongolia. The results showed that a drying trend occurred in Inner Mongolia in recent 60 years, especially in the 1960s and the beginning of this century. Spatially, the extreme precipitation indices were holistically in a decrease trend from the eastern and western parts to the central area, and their low values occurred in Jining, Huhhot, Tongliao and Xin Barag Right Banner. A mutation of the extreme precipitation indices occurred in 1995, and after that these indices were in a slight reduction. There were the 3-5 a, 14-17 a and about 20 a periodic changes of extreme precipitation indices. There were the high correlations between the extreme precipitation indices and the annual precipitation except CDD. The change of extreme precipitation in Inner Mongolia resulted in the drought and wind disasters, grassland desertification and reduction of flood and low temperature disasters in the study area. Suitable measures should be taken to prevent and control drought and wind disasters.

Key words: extreme precipitation, spatiotemporal variation, precipitation mutation, periodic law, Inner Mongolia