Analysis of Spatiotemporal Variation Characteristics of Extreme Climate Index in Yunnan Province from 1959 to 2015

Abstract

Abstract:

With the increase in greenhouse gas concentrations， extreme climate events have become increasingly prominent. Plateau and mountainous areas are sensitive and fragile regions affected by climate change. Based on the daily temperature and precipitation data of 116 meteorological stations in Yunnan Province， the Mann-Kendall test and Sen slope estimation were used to analyze the spatiotemporal variation characteristics of extreme climate indexes in Yunnan Province from 1959 to 2015. The results showed that all nine extreme temperature indexes had significantly changed， with extreme warm indexes showing a significant increase and extreme cold indexes showing a significant decrease. The decline rate of frost days （FD） in northwest and central Yunnan was significantly higher than other areas， and multiple extreme temperature indexes in the central part of Honghe Prefecture and the western part of Pu'er City showed a higher rate of change than other areas. Only the consecutive wet days （CWD） index among the eight extreme precipitation indexes passed the significance test at the level of 0.05， and the changes in the other indexes were not significant. The total annual precipitation decreased， while the amount of intense precipitation （R95pTOT） and extremely intense precipitation （R99pTOT） increased， indicating a trend towards more concentrated and intense precipitation. There was low consistency in spatial variation， and most stations did not show significant trends. Multiple extreme precipitation indexes in the central part of Honghe Prefecture， the western part of Pu'er City， and the southwestern part of Dehong Prefecture showed significant decrease， indicating a trend toward drought in these regions.

Key words: font-family:", ">extreme climate indexfont-family:宋体, ">, font-family:", ">spatiotemporal variation characteristicsfont-family:宋体, ">, font-family:", "> Yunnan Province

CLC Number:

Zhu Zhanpeng, Li Zhongmu.

Analysis of Spatiotemporal Variation Characteristics of Extreme Climate Index in Yunnan Province from 1959 to 2015 [J]. Journal of Dali University, 2023, 8(6): 52-60.

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