安徽农业科学2017，Vol.45Issue(17)：166-169,4.
拉萨市极端气候变异特征及环流机制分析
Analysis on Variation Characteristics of Extreme Climate in Lhasa City and Its Circulation Mechanism
摘要
Abstract
Using the daily maximal and minimal temperature data in Lhasa station from 1961 to 2014,extremely temperature index system was established,the variation law of extreme high temperature and extreme low temperature in Lhasa City and its correlation with circulation were analyzed by the statistics and wavelet analysis method.The results showed that the variation characteristics of extremely high temperature had no significant change at a rate of 4.778 ℃/10 a.But there had a significant increase for extreme low temperature index at a rate of 10.622 ℃/10 a.From the frequency of occurrence,the frequency of extreme high temperature showed an increasing trend,and the frequency of extreme low temperature showed a decreasing trend.From the interdecadal perspective,the extreme high temperature index increased obviously after 1980s,that had been in the high value area in 1990s and nearly 10 years.Extreme low temperature index reduced significantly after 1980s,it was suggested that the extreme low temperature with the trend of warming.The extremely temperature had quasi oscillation period of 30 years during 1970s,but there had been decreased after 1980s.The extremely high temperature in summer had a significant correlation with the Pacific subtropical high index and Asia polar vortex area index,but it had a negative correlation with India-Burma trough.The extremely low temperature in winter had a significant correlation with Pacific subtropical high index and Asia polar vortex area index.关键词
极端气温/变异特征/环流机制/相关系数/小波分析Key words
Extreme temperature/Variation characteristics/Circulation mechanism/Correlation coefficient/Wavelet analysis分类
农业科技引用本文复制引用
高佳佳,杜军,次仁央宗,次旺顿珠..拉萨市极端气候变异特征及环流机制分析[J].安徽农业科学,2017,45(17):166-169,4.基金项目
国家科技部公益性行业科研专项(GYHY201306029). （GYHY201306029）
