Analysis of Meteorological Variables in Dianzhong Region in Recent 51 Years

ZHENG Yijia1,2, MIAO Yucong1, LIU Shuhua1,†, HE Ping3,†, WANG Shu1

ACTA Scientiarum Naturalium Universitatis Pekinensis - - Contents -

1. Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing 100871; 2. Zhejiang Meteorological Observatory, Hangzhou 310017; 3. The College of Geography and Tourism Management, Chuxiong Normal University, Chuxiong 675000; † Correponding authors, E- mail: lshuhua@pku. edu. cn ( LIU Shuhua), heping@cxtc. edu. cn ( HE Ping)

Abstract To understand the climate change in Dianzhong region, Yunnan Province, the near-surface observations from 1963 to 2013 in four cities (i.e. Kunming, Chuxiong, Yuxi, and Qujing) were analyzed. Significant warming trend was found in the past 51 years in all the four cites. Comparing the warming trend in different seasons, it was found that the warming rate was fastest in winter. The warming phenomenon was most significant in Kunming, which might be relevant to the urbanization there in the past decades. The annual precipitation presented a slightly decreasing trend. The precipitation increased in the dry seasons (spring and winter), while decreased in the wet seasons (summer and autumn). In the four cities, the decrease of precipitation was most significant in Kunming, while it was slight in Chuxiong. In addition, the decrease of relative humidity was found, and the different between the seasons is not huge. The correlations between different meteorological variables can also be found through the

16‒ wavelet analysis. It was found that the 36-year cycle of temperature was relevant to that of relative humidity, and the 32 years cycle of relative humidity was also related to that of precipitation in Dianzhong region. Key words Dianzhong region; morlet wavelet; statistical analysis; climate change

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