北半球冬季WA遥相关型影响东亚初夏季风的可能途径

Possible way of the effect of WA teleconnection pattern on the early summer monsson over eastern Asia

通过 SVD和滞后相关分析 ,研究了北半球冬季 WA遥相关型与后期初夏东亚季风的联系及可能的影响途径。结果表明 ,北半球冬季 WA型与东亚初夏季风存在密切的联系 ,其影响东亚初夏季风的过程可概述为 :在北半球冬季 ,WA型强弱可引起西北大西洋海温异常 ,由于海温具有很好的持续性 ,这种海温异常可一直持续到春季和初夏 6月份 ;而春季和初夏 6月份 ,北大西洋海温异常又反过来对大气环流产生影响 ,引起欧亚中高纬大气环流异常 ,特别是初夏 6月西北欧以及乌拉尔山和鄂霍茨克海附近的大气环流的异常 。

In the context of the SVD and lagged correlation analysis, the relationship betw een the WA pattern in the northern hemisphere winter and the early summer monsoo n over eastern Asia and the possible way in association with the former and the latter are conducted. Results show that the early summer monsoon over eastern As ia is closely related to the WA teleconnection pattern and the possible way in c ombination with the WA pattern and early summer monsoon over eastern Asia can be described as follows: The winter WA pattern produces northwest Atlantic SSTA do minantly by dint of sea-air interaction on a local basis, which lasts till spri ng and early summer and causes,in turn, the anomaly of the atmospheric circulati ons in the NW Europe to the Urals and Okhotsk sea, thereby exerting effect on th e east Asian monsoon in early summer.