Northern hemisphere winter circulation associated with the North Atlantic Oscillation and stratospheric polar‐night jet
Northern hemisphere winter circulation associated with the North Atlantic Oscillation and stratospheric polar‐night jet
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与北大西洋涛动和平流层极夜急流相关的北半球冬季环流
DOI：
10.1029/1999gl900016
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发表时间：
1999
影响因子：
5.2
通讯作者：
Hiromasa Yoshimura
中科院分区：
文献类型：
--
作者：
K. Kodera;H. Koide;Hiromasa Yoshimura
本文研究了冬季大气环流的年际变化，其特征是500 hPa高度场和850 hPa温度场与北大西洋涛动（NAO）和平流层极地夜间急流（PNJ）有关。结果表明，与NAO指数相关的冬季大气环流可分为两种不同的变率模态。一种是区域性模态，其特征是大西洋地区500 hPa高度距平场的纬向偶极子型。另一个则具有更明显的纬向结构，在北方更广阔的区域上延伸，这也与平流层下部的极夜急流有关。欧亚大陆东部近地面气温与上述半球变率模态的关系比区域NAO更密切。
The interannual variability of the atmospheric winter circulation as characterized by the geopotential height at 500 hPa and temperature at 850 hPa, associated with the North Atlantic Oscillation (NAO) and stratospheric polar night jet (PNJ) is examined. It is suggested that the wintertime atmospheric circulation related to the NAO index can be separated into two different modes of variability. One is a regional mode, characterized by a meridional dipole type pattern in the 500 hPa geopotential height anomaly field over the Atlantic region. The other, having more zonal structure, extends over wider region of the northern hemisphere; this is also related to the lower stratospheric polar night jet. Air temperature near the surface over the eastern part of the Eurasian continent is more closely correlated with the above‐mentioned hemispheric mode of variability than the regional NAO.