青藏高原近50年来气温变化特征的研究

Analyses on Variety Characteristics of Temperature in Qinghai-Tibet Plateau in Recent 50 Years

通过对我国青藏高原地区 ,195 1～ 2 0 0 0年的年平均气温、日最高气温、日最低气温随时间变化规律的分析发现 :青藏高原近 5 0年来年平均气温、日最高气温、日最低气温随时间均呈增温态势 ;日最低气温的增温比日最高气温的增温更显著 ;2 0世纪 90年代以来气温明显偏高 ;但也有新的特点即 :一月份日最高气温进入 90年代不但没有变暖这反而是降底的 ;80年代后期年平均气温、日最高气温、日最低气温发生了显著的变暖突变。

This paper is mainly studied temperature change on the Qinghai-Tibet plateau area and analysed the features of the daily minimum temperature as well as the daily maximum temperature and the daily minimum temperature in the Qinghai-Tibet plateau area in 1951～2000.This paper has achieved some conclusions:the daily mean temperature, the daily maximum temperature and the daily minimum temperature all increased in recent 50 years in Qinghai-Tibet plateau area. The increasing speed of daily minimum temperature is faster than that of the daily maximum temperature. The temperature in 1990s is apparently higher than that in the former period and the main new feature in 1990s is that the January daily maximum temperature does not get warmer but colder. There is abrupt changes in the daily mean temperature, the daily maximum temperature, the daily minimum temperature in 1980s.