关键词: 云南高原, 楚雄市, 气温, 降水, 变化特征

Abstract: Based on the data of temperature and precipitation in Chuxiong City from 1971 to 2020, the variation characteristics of temperature and precipitation in Chuxiong City during this period are analyzed. The results show that the annual average temperature in Chuxiong City has fluctuated and increased in recent 50 years, with a significant upward trend since 1987. In recent 50 years, the temperature is the highest in summer and the lowest in winter. The highest temperature appears in June（21.6℃）, and the lowest temperature appears in January（9.2℃）. The temperature has periodic oscillation in different scales. The first main cycle is a 30a time scale, which has experienced five stages of alternating changes. The isoline from 2013 to 2020 is not closed, and the temperature is expected to continue to rise in the next few years; In the past 50 years, the precipitation fluctuated obviously and showed a downward trend, and the precipitation in the year mainly falls from May to October. In the dry season, from November to April, the precipitation in Chuxiong City was less. The maximum precipitation (154.7 mm) was registered in July and the minimum (8.1 mm) in February. Wavelet analysis has identified a main 32-year cycle in which the precipitation has experienced an alternating change of increase and decrease in five stages. Moreover, the isoline in 2013-2020 is not closed. So it is predicted that the precipitation will increase in the next few years, and the precipitation suddenly changed in 1983; The temperature and precipitation in Chuxiong City are unevenly distributed throughout the year. In different periods of rain and heat, the highest temperature appears in June, while the highest precipitation appears in July, with maximum precipitation falling one month behind the maximum temperature.

Key words: Yunnan Plateau, Chuxiong City, temperature, precipitation, change characteristic