近50年青藏高原地面气温变化的区域特征分析  

Analyese on Regional Characteristics of Temperature Changes over Qinghai-Xizang Plateau in Recent 50 Years

作　　者：周宁芳[1] 秦宁生[2] 屠其璞[3] 李栋梁[4] 

机构地区：[1]南京大学大气科学系,江苏南京210093 [2]青海省气候资料中心,青海西宁810001 [3]南京信息工程大学资源环境与城乡规划系,江苏南京210044 [4]中国科学院寒区旱区环境与工程研究所,甘肃兰州730000

出　　处：《高原气象》2005年第3期344-349,共6页Plateau Meteorology

基　　金：中国科学院知识创新工程重大项目(KZCX1SW04);科技部社会公益研究项目(2001DIB10085)共同资助

摘　　要：青藏高原地面气温与其上空500hPa温度有着密切的关系,基于这种关系,重建得到青藏高原1950—2000年连续、可靠的台站地面月平均气温序列。利用重建后的地面月平均气温资料,对青藏高原年及各季节平均气温的变化进行区域划分,分析了近50年青藏高原全年及各季节气温变化的区域特征。结果表明,青藏高原的年、春、夏、秋季与冬季平均气温变化区域分别可以划分为4个区、2个区、4个区、5个区和4个区。青藏高原近50年气温总体上升,但同时存在明显的区域性和季节性差异,大部分区域的平均气温变化和高原总体升温相似,春季和冬季升温明显,特别是春季和冬季的Ⅰ区。夏、秋季升温趋势不明显,夏季Ⅰ区与秋季Ⅲ区还表现出较小的降温趋势,降温幅度分别为-0.26℃和-0.11℃。According to the good relationship between the surface air temperature and 500 hPa temperature over Qinghai-Xizang Plateau(QXP), the sequence of continuous and reliable monthly mean surface air temperature over QXP in 1950_2000 were reestablished. Again according to the REOF analyses of the data of the subregions of mean air temperature change for year, spring, summer, autumn and winter were divided into four, two, three, five, and four sub-regions respectirely. The results show that there are obvious regional and seasonal differences over QXP in the recent 50 years. Overall the surface air temperature over QXP in recent 50 years raise, but there are obvious regional and seasonal differences. The changes of mean air temperature in the most of sub-regions are similar to those whole over Plateau, but the temperature warming in spring and winter are more obvious, especially in sub-region I and in spring and winter; howerer the warming in summer and autumn are not so obvious, even there are some cooling occurring, particularly in sub-region I in summer and sub-regions Ⅲ in autumn, their temperature are decreased by -0.26℃ and -0.11℃ respectively.

关 键 词：青藏高原 地面气温重建 气温的REOF分区 温度变化的区域特征 

分 类 号：P423.3[天文地球—大气科学及气象学]