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A kinematic mechanism for positive feedback between synoptic eddies and NAO

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摘要

A kinematic mechanism for the positive feedback between the North Atlantic Oscillation (NAO) and synoptic eddies are depicted based on observational data analyses.Using three-point resealed covariance statistics of bandpass-filtered (2-8 days) synoptic eddy fields, we examined observed eddy structure changes associated with wintermeanNAO anomalous flow. It is demonstrated that the NAO flow anomalies systematically deform the structures of recurring synoptic eddies to generate seasonal-mean eddyvorticity flux anomalies predominately directed to the lefthand side of the NAO flow anomalies. These anomalous eddy-vorticity fluxes converge into the cyclonic center anddiverge from the anticyclonic center of the anomalous NAO flow, and thus enhance the NAO flow.

著录项

  • 来源
    《Geophysical Research Letters》 |2009年第11期|L11709:1-L11709:5|共5页
  • 作者单位

    Visiting professor at Department of Meteorology, School of Ocean and Earth Sciences and Technology, University of Hawai'i,Honolulu, Hawaii, USA.;

    Laboratory for Climate Studies, National Climate Center, China Meteorological Administration, Beijing, China.;

    Korca Ocean Research and Development Institute, Ansan, South Korea.Department of Meteorology, School of Ocean and Earth Sciences and Technology, University of Hawai'i, Honolulu, Hawaii, USA.School of Earth and Environment Sciences, Seoul National University,Seoul, South Korea.;

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  • 原文格式 PDF
  • 正文语种 英语
  • 中图分类 地球物理学;
  • 关键词

    observational; systematically; converge;

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