气象学报2017，Vol.75Issue(4)：581-595,15.DOI:10.11676/qxxb2017.042
厄尔尼诺年西北太平洋异常反气旋的年际变化特征及其影响
摘要
Abstract
The inter-annual variation of the western North Pacific anomalous anticyclone (WNPAC) during El Nio years was investigated based on a variety of air-sea datasets during the period of 1901 to 2000, and its impact on East Asian climate was also discussed.Results show that there are two main spatiotemporal modes for the WNPAC based on empirical orthogonal function (EOF) analysis, i.e., the first mode as its intensity variation and the second mode as its position variation.During the El Nio mature phase in winter, the WNPAC intensity is highly correlated with sea surface temperature anomalies (SSTAs) over the equatorial central-eastern Pacific and the West Pacific (WP) teleconnection pattern at 500 hPa, while its position is highly related to SSTAs over the western North Pacific and Arctic Oscillation (AO).In the subsequent spring season after the El Nio mature phase, the intensity of WNPAC is also highly correlated with SSTAs over the equatorial Atlantic in addition to its high correlation with SSTAs over the equatorial central-eastern Pacific and WP teleconnection pattern in winter, while its position is greatly influenced by SSTAs over the western North Pacific and WP teleconnection pattern.In the subsequent early summer, the intensity of WNPAC is highly related to SSTAs over the northwestern and southwestern Indian Ocean and East Asia-Pacific (EAP) teleconnection pattern.Results further indicate that the inter-annual variations of both the WNPAC intensity and position have great impacts on precipitation over East Asia during El Nio mature winter and subsequent spring and early summer.Additionally, the intensity of the WNPAC is also highly negatively correlated with the occurrence frequency of tropical cyclone over the western North Pacific during the early summer, i.e., the stronger the WNPAC intensity is, the fewer the number of tropical cyclone is, and vice versa.关键词
厄尔尼诺/西北太平洋异常反气旋/太平洋西部型/北极涛动/东亚-太平洋型Key words
El Ni(n)o/WNPAC/WP/AO/EAP分类
天文与地球科学引用本文复制引用
李慧敏,徐海明,李智玉..厄尔尼诺年西北太平洋异常反气旋的年际变化特征及其影响[J].气象学报,2017,75(4):581-595,15.基金项目
国家自然科学基金项目(41575077、41490643)、江苏省333高层次人才培养工程(BRA2015290). （41575077、41490643）
