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A general rule for synoptic-eddy feedback onto low-frequency flow

Abstract

In this study, scale interaction between synoptic eddies and low-frequency flow is investigated. It is demonstrated here that there is a general rule, the “left-hand rule”, that describes synoptic eddy feedback onto low-frequency flow. The rule is that low-frequency anomalies systematically stir and deform the transient eddies in such a way that the irrotational eddy-vorticity fluxes are directed preferentially about 90° toward the left-hand side of the low-frequency flow; thus this eddy feedback plays a positive role in maintaining and prolonging low-frequency flow under the stormy atmosphere. Similarly, we show that the irrotational eddy-temperature and moisture fluxes are also directed preferentially about 90° toward the left-hand side of the low-frequency flow in the northern hemisphere. The eddy-temperature fluxes and their vertical structure play a positive role in reinforcing the low-frequency flow in the low levels. The moisture fluxes play a role in enhancing low-frequency flow by providing eddy-induced moisture convergence and divergence.

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Acknowledgments

This work was supported by NSF grants ATM-702 0652145 and ATM-0650552 and NOAA grants GC01-229. J.-S. Kug 703 is supported by KORDI (PE98417, PP00720). I.-S. Kang was supported by the second stage of the Brain Korea 21 Project.

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Correspondence to Jong-Seong Kug.

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Kug, JS., Jin, FF., Park, J. et al. A general rule for synoptic-eddy feedback onto low-frequency flow. Clim Dyn 35, 1011–1026 (2010). https://doi.org/10.1007/s00382-009-0606-8

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  • DOI: https://doi.org/10.1007/s00382-009-0606-8

Keywords

  • Moisture Flux
  • Transient Eddy
  • Eddy Flux
  • Cyclonic Flow
  • Synoptic Eddy