Left-hand rule for synoptic eddy feedback on low-frequency flow

Details Left-hand rule for synoptic eddy feedback on low-frequency flow Left-hand rule for synoptic eddy feedback on low-frequency flow

Mar 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3605709k&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 5, CiteID L05709

Physics

Geophysics

13

Atmospheric Processes: Climate Change And Variability (1616, 1635, 3309, 4215, 4513), Nonlinear Geophysics: Self-Organization, Atmospheric Processes: General Circulation (1223), Global Change: Climate Dynamics (0429, 3309), Global Change: Climate Variability (1635, 3305, 3309, 4215, 4513)

Scientific paper

In this study, scale interaction between synoptic eddies and low-frequency flow is investigated. The synoptic eddy feedback is a key process in sustaining the low-frequency flow. We show clear evidence using NCEP reanalysis data that there is a general underlying rule-the ``left-hand rule'', governing the synoptic eddy feedback onto low-frequency flow. This rule states that eddy-vorticity fluxes are directed preferentially about 90 degrees toward their left-hand side, so that they converge into cyclonic flow and diverge from anticyclonic flow. Therefore, the eddy vorticity flux plays a positive role in reinforcing low-frequency flow.

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