A kinematic mechanism for positive feedback between synoptic eddies and NAO

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Atmospheric Processes: General Circulation (1223), Global Change: Climate Dynamics (0429, 3309), Global Change: Climate Variability (1635, 3305, 3309, 4215, 4513), Oceanography: General: Climate And Interannual Variability (1616, 1635, 3305, 3309, 4513), Atmospheric Processes: Climate Change And Variability (1616, 1635, 3309, 4215, 4513)

Scientific paper

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 rescaled covariance statistics of band-pass-filtered (2-8 days) synoptic eddy fields, we examined observed eddy structure changes associated with winter-mean NAO anomalous flow. It is demonstrated that the NAO flow anomalies systematically deform the structures of recurring synoptic eddies to generate seasonal-mean eddy-vorticity flux anomalies predominately directed to the left-hand side of the NAO flow anomalies. These anomalous eddy-vorticity fluxes converge into the cyclonic center and diverge from the anticyclonic center of the anomalous NAO flow, and thus enhance the NAO flow.

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