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GEOPHYSICAL RESEARCH LETTERS, VOL. 33, L18703, doi:10.1029/2006GL026380, 2006

Global influence of the Northern Hemisphere second mode of the zonal average of the zonal wind

Jie Song

Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Science, Beijing, China


Wen Zhou

Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Science, Beijing, China


Jing Pan

Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Science, Beijing, China


Chongyin Li

Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Science, Beijing, China


Abstract

The authors examine the impact of two zonal wind modes in the northern hemisphere (Northern Annular Mode, NAM, and the second zonal wind mode) on the global domain during the normal (non-El Niño/Southern Oscillation, ENSO) northern winter from 1981–2002. It is found that both modes are in association with tropical zonal wind anomalies, but only the second zonal wind mode has significant linkage with the Southern Annular Mode (SAM), particularly leading about 6–19 days. This kind of linkage can also be found in extended datasets but only evident since 1974.

Received 24 March 2006; accepted 4 August 2006; published 23 September 2006.

Index Terms: 1610 Global Change: Atmosphere (0315, 0325); 1616 Global Change: Climate variability (1635, 3305, 3309, 4215, 4513); 3319 Atmospheric Processes: General circulation (1223).

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Citation: Song, J., W. Zhou, J. Pan, and C. Li (2006), Global influence of the Northern Hemisphere second mode of the zonal average of the zonal wind, Geophys. Res. Lett., 33, L18703, doi:10.1029/2006GL026380.