【摘要】 通过对中国西南地区1951~2000年的平均气温、日最高气温、日最低气温随时间变化特征的分析发现:在全球气候变暖的背景下,西南地区年平均气温、年平均日最高气温、年平均日最低气温自20世纪80年代中期以来呈升温态势,在1998年达到50年来最高值;中国西南地区近50年来日最高气温呈降温态势,其年际变化大于平均气温和日最低气温;日最高气温的下降对平均气温影响大;日最低气温总体上呈升温态势,冬季1月升温比夏季7月显著;冬季气温在80年代为暖期;夏季气温在50年代为暖期。更多还原

【Abstract】 Based on the data of mean temperature,daily minimum temperature and daily maximum temperature in Southwest China from 1951 to 2000,characteristics of temperature variations are analyzed.The results show that the mean temperature,the daily maximum temperature and the daily minimum temperature annually all increased after the mid 1980s and the peak temperature occurred in 1998.During the last 50 years,the daily maximum temperature shows a decreasing trend.The annual variation of daily maximum temperature is larger than that of the mean temperature and also the daily minimum temperature.The decrease of daily maximum temperature has obvious influence on the mean temperature.The daily minimum temperature shows an increasing trend,and the increasing trend of temperature is much more obvious in winter than in summer.Warm period of summer and winter occurred respectively in 1950s and in 1980s.更多还原