大气科学2012，Vol.36Issue(2)：374-384,11.DOI:10.3878/j.issn.1006-9895.2011.11055
北大西洋涛动位相转换的数值研究
A Numerical Study of the Phase Transition of the North Atlantic Oscillation
摘要
Abstract
Using a nonlinear quasi-geostrophic barotropic model, the paper investigates numerically how the spatial pattern of synoptic scale waves and the westerly wind strength affect the phase transition of the North Atlantic Oscillation (NAO) , and the role played by the large-scale topography. It is found that the weak basic westerly wind is favorable for the westward shift of the downstream large-scale system, favoring the transition of the NAO from positive (negative) phase into negative (positive) phase. It is noted that when the synoptic scale waves are stronger and concentrated in a wider region, the NAO event can transform more easily from the negative phase into positive phase; when the synoptic scale waves are stronger and shift northward, the NAO can transform more easily from the positive into negative phase. In the presence of a large scale topography, the number of the cases in which the NAO transforms from positive (negative) phase to negative (positive) phase is reduced.关键词
北大西洋涛动(NAO)/位相转换/数值研究/天气尺度波/西风气流Key words
North Atlantic Oscillation (NAO)/ phase transition/ numerical study/ synoptic scale waves/ westerly wind strength分类
天文与地球科学引用本文复制引用
李忠燕,罗德海..北大西洋涛动位相转换的数值研究[J].大气科学,2012,36(2):374-384,11.基金项目
国家自然科学基金资助项目41075042,中国科学院“百人计划”资助项目y163011 （）
