亚洲冬季地表气温与北半球海平面气压场的关系  

Relation between the Winter Surface Air Temperature Fields in Asia and the Northern Hemisphere Sea Level Pressure

作　　者：任菊章[1] 琚建华[1] 赵刚[1] 

机构地区：[1]云南大学东南亚气侯与环境研究中心,昆明650091

出　　处：《气候与环境研究》2003年第4期436-442,共7页Climatic and Environmental Research

基　　金：国家重点基础研究发展规划项目"我国重大气侯灾害形成机理和预测研究" (G1 9980 490 0 )资助

摘　　要：利用NCEP资料对 1 949～ 1 999年间的地表气温进行经验正交函数分解 (EOF) ,得到的前两个模态均表明 ,2 0世纪 70年代中期以后 ,在两个模态迭加的情况下 ,亚洲大部分区域冬季气温升高 ,增暖明显 ,发生了显著的年代际变化。奇异值分解 (SVD)冬季亚洲地表气温和北半球海平面气压场得到的结果说明 ,北极涛动对亚洲冬季气温的年代际变化有显著影响 ,其次北太平洋海平面气压与陆地海平面气压的反相分布可能对亚洲冬季气温的年际变化有影响。Muti-scale winter (December-February) surface air temperature (SAT) variability in Asia and its long-term link to the Northern Hemisphere(NH) sea level pressure (SLP) variability are studied for the period of 1949～1999. Firstly, the dominant spatial and temporal patterns of surface air temperature anomaly are studied by empirical orthogonal function (EOF) analysis. EOF1 and EOF2 show a sudden shift over Asia in the middle 1970s. The mean SAT over Asia was increasing since the 1970s by the superimposed impact of EOF1 and EOF2. Secondly, to understand the long-term SAT variability that is link to NH SLP variability, the singular value decomposition (SVD) analysis for the two fields is carried out. SVD1 exhibits the so-called Arctic Oscillation (AO) winter circulation pattern. This model shows that the interdecadal variability of SAT over Asia can be attributed to NH SLP effects results. SVD2 exhibits the inverse phase between SLP in the northern Pacific and SLP in Asia. This mode shows the main cause of the SAT interannual variability over Asia.

关 键 词：地表气温 海平面气压 北极涛动 年代际变化 气压场 

分 类 号：P448[天文地球—大气科学及气象学]