西双版纳地区近45年来气候变化特征

Characteristics of Climate Change in Recent 45 Years in Xishuanbanna

根据云南省西双版纳州景洪市气象站1961年1月至2005年1月的气温及降水资料,分析了西双版纳近45年来的气候变化特征,得出近45年来西双版纳年降水量呈下降趋势(-20.72 mm/10a),夏季降水量减少较明显(-24.28 mm/10a),春季降水量却呈上升趋势(11.18 mm/10a);年平均气温呈上升趋势(0.262℃/10a),四季气温也呈上升趋势,尤其是冬季变暖最明显(0.483℃/10a);年极端低温的上升趋势(0.545℃/10a)远远大于年极端高温的下降趋势(-0.088℃/10a)。以20世纪70年代末为界将近45年西双版纳气候分为冷、暖两个阶段,前为冷期,后为暖期。

A analysis is made of climate change in recent 45 years by means of the temperature and precipitation data from 1961 to 2005 of the Jinghong meteorological station. The results indicate that the precipitation showed a decreasing trend （-20. 72 mm per 10 years）; summer precipitation decreased obviously （-24.28 mm per 10 years） ; spring precipitation had an increasing trend （11.18 mm per 10 years） ; annual mean temperature showed an inreasing trend （0. 262 ℃ per 10 years）, especially in winter （0. 483 ℃ per 10 years）. The increasing trend of annual extreme low temperature （0. 545 ℃ per 10 years） is more obvious than the decreasing trend of annual extreme high temperature （-0. 088 ℃ per 10 years）. The recent 45 years in Xishuanbanna can be divided into cold and warm periods.