1961-2017年西藏主要农区夏季气温变化特征  

Characteristics of Summer Temperature Changes in Main Agricultural Areas of Tibet from 1961 to 2017

作　　者：赤曲 周顺武[1] 孙阳 假拉 多典洛珠 CHI Qu;ZHOU Shunwu;SUN Yang;JIA La;DUO Dianluozhu(Nanjing University of Information Science ＆ Technology,Nanjing 210044,China;Meteorological Observatory of Tibet Autonomous Region,Lhasa 850000,China;Lhasa Meteorology Bureau,Lhasa 850000,China)

机构地区：[1]南京信息工程大学,南京210044 [2]西藏自治区气象台,拉萨850000 [3]西藏自治区拉萨市气象台,拉萨850000

出　　处：《高原山地气象研究》2018年第3期23-28,共6页Plateau and Mountain Meteorology Research

基　　金：国家自然科学基金项目(41175081);西藏自然区重点科技计划(XZ201703-GA-01)

摘　　要：根据近57a(1961～2017年)西藏主要农区4个站(拉萨、日喀则、泽当和江孜)夏季(6～8月)的月平均气温资料,通过统计诊断方法分析了该地区夏季气温变化特征,并探讨了气温变化与同期西藏高原指数的关系。结果表明:(1)在全球变暖的大背景下,近57a,西藏主要农区夏季气温存在显著的增暖趋势(增温率约为0. 32℃/10a)。(2)该地区夏季气温存在明显的年际变化,普遍具有准3a的周期振荡;夏季气温在2004年发生了显著的气候突变。(3)该地区夏季气温与同期西藏高原指数之间存在显著的正相关关系,两者的年际变化特征和长期趋势变化基本一致。表明当高原及周围500hPa位势高度异常偏低(高)时,西藏主要农区夏季气温异常偏低(高)。Based on the monthly mean temperature data of 4 meteorological stations （Lhasa, Shigatse, Zedang and Jiangzi） in main agricultural areas of Tibet in recent 57a （1961 -2017） in summer, the characteristics of the summer temperature change in these areas were analyzed using the statistical diagnosis method, with the relationship between the temperature variation and the Tibetan plateau index in the same period explored. The results showthat ： （ 1 ） With the global warming, the summet temperature in main agricultural areas of Tibet has been undergoing significant warming trend in the past 67a （ the wamling rate is about 0.32/10a）. （2） A striking interannual variation of summer temperature in these areas was fbund, which is quasi - three - year periodic oscillation. In addition, the summer temperature has a distinct climate change in 2004. （3） Furthermore, there is a significant positive correlation existing in summer temperature and the Tibet plateau index in the same period, with the characteristics of interannual change basically identical to the long - term trend changes in the areas, which indicates that the temperature in summer in the main agricultural areas of Tibet is extremely low （high） when the 500hPa geopotential height in the plateau and the surrounding areas is extremely low （high）.

关 键 词：西藏主要农区 夏季 气温 变化趋势 突变 

分 类 号：P462.6[天文地球—大气科学及气象学]