青藏高原东部夏季降水凝结潜热变化特征分析  

Analysis on Variation Characteristics of Latent Heat over Eastern Tibetan Plateau in Summer

作　　者：曹毅[1] 范广洲[1,2] 赖欣[1] 华维[1] 张永莉[1] 

机构地区：[1]成都信息工程大学大气科学学院高原大气与环境四川省重点实验室,四川成都610225 [2]南京信息工程大学气象灾害预报预警与评估协同创新中心,江苏南京210044

出　　处：《成都信息工程学院学报》2015年第6期593-599,共7页Journal of Chengdu University of Information Technology

基　　金：国家自然科学基金资助项目(41275079;41405069;41305077)

摘　　要：为了解高原东部夏季降水凝结潜热的基本情况和变化特征,利用青藏高原东部93个站点1961~2013年逐月降水资料计算夏季降水凝结潜热,采用经验正交分解法、小波分析和M-K检验等进行分析研究。得到以下结论：青藏高原东部降水凝结潜热呈现由东南向西北递减的分布,存在2条东南-西北向的大值脊,其间的低值区基本与高原河谷位置重合。EOF分析得到最主要的模态为东北-西南反向型。区域平均的时间序列显示53年青藏高原东部平均夏季降水凝结潜热呈略微减少的趋势,但不同区域的变化趋势存在差异。高原东部平均降水潜热值在70年代初存在一次突变。降水凝结潜热气候倾向率分布表明潜热值原本就大的区域53年来值变得更大,高原河谷区则在减少。In order to learn about the basic situation of precipitation latent heat of eastern Tibetan Plateau,latent heat is calculated by using precipitation data of 93 stations in eastern Tibetan Plateau from 1961 to 2013. Researching by using EOF analysis,wavelet analysis,Mann-Kendall test,etc,the results as follows. latent heat decreas from the southeast to the northwest. There are two high value ridges extend from southeast to the northwest. The low value region between them coincides with the plateau valley. The most important model presented by EOF is southwest-northeast reverse pattern. Regional average time series of latent heat reveals a slight decreasing tendency during the past 53 years. However,the trends are different in subareas. It seems that a mutation exists in early 1970 s. The distribution of latent heat climatic trend rate shows that latent heat in high value area become larger during 53 years,and the value of plateau valley area is decreas.

关 键 词：大气科学 气候变化 青藏高原 凝结潜热 降水潜热 

分 类 号：P468[天文地球—大气科学及气象学]