近55 a内蒙古极端降水指数时空变化特征

doi:10.13866/j.azr.2019.04.21

Abstract

Abstract: Nine extreme precipitation indices recommended by the Climate Change Monitoring and Index Expert Group (ETCCDI) were selected.The Sen’s slope,the Mann-Kendall nonparametric statistical test and Geostatistical Analyst methods were used to study the spatiotemporal variation of these indices based on the daily precipitation data from 100 meteorological stations in Inner Mongolia from 1960 to 2014.The results showed that the average extreme precipitation indices of the study area were in a decrease trend in varying degrees,and their interannual fluctuations were significant.Their interannual trends in the subareas were different,that is,in the eastern area,the wet days (NW) was in an increase trend,and other indices were in a decrease trend,among which the continuous drying index (CDD) was in a significant decrease trend (P<0.05); in the central area,all the extreme precipitation indices were in a decrease trend,and the reduction of total annual precipitation was more obvious; in the western area,the continuous wetness index (CWD),heavy precipitation (R95),monthly maximum 1-day precipitation (Rx1day),and monthly maximum consecutive 5-day precipitation (Rx5day) were in a decrease trend,and other indices were in an increase trend.Viewing from the spatial distribution of the change trend of extreme precipitation indices,the regional difference was significant.The stations with a general decrease trend of these indices were mainly distributed in the eastern and central areas of Inner Mongolia,and those with an increase trend were mainly distributed in the northeastern and western parts of Inner Mongolia.

Key words: extreme precipitation, spatiotemporal distribution, Mann-Kendall test, change trend, Inner Mongolia

CHUN Lan, QIN Fu-ying, BAO Lu, NA Yin-tai, BAO Yu-hai, BAO Shan-hu. Spatiotemporal Variation of Extreme Precipitation Indices in Inner Mongolia in Recent 55 Years[J].Arid Zone Research, 2019, 36(4): 963-972.

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Spatiotemporal Variation of Extreme Precipitation Indices in Inner Mongolia in Recent 55 Years

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