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Contraction of Westward-travelling Nonlocal Modons Due to the Vorticity Filament Emission : Volume 9, Issue 3/4 (30/11/-0001)

By Berson, D.

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Book Id: WPLBN0004020024
Format Type: PDF Article :
File Size: Pages 15
Reproduction Date: 2015

Title: Contraction of Westward-travelling Nonlocal Modons Due to the Vorticity Filament Emission : Volume 9, Issue 3/4 (30/11/-0001)  
Author: Berson, D.
Volume: Vol. 9, Issue 3/4
Language: English
Subject: Science, Nonlinear, Processes
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
-0001
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Kizner, Z., & Berson, D. (-0001). Contraction of Westward-travelling Nonlocal Modons Due to the Vorticity Filament Emission : Volume 9, Issue 3/4 (30/11/-0001). Retrieved from http://hawaiilibrary.net/


Description
Description: Department of Physics, Bar-Ilan University, Ramat-Gan 52900, Israel. Long-term evolution of westward-travelling non-local modons on the β-plane, i.e. dipolar vortices imbedded in slowly damping Rossby wave fields, is studied numerically. In the framework of the nondivergent (barotropic) model, two stages of the evolution are observed. At the first stage (for about 30 synoptic periods), the parameters and the form of the vortex practically remain constant, whereas at the second stage, vorticity filaments are emitted. Due to the filamentation, the vortex core contracts, the potential vorticity peaks of the vortex pair get closer, and the modon speeds up. In the divergent (equivalent-barotropic) model, nonlocal modons and the Lamb modon (that has no wave field outside the dipolar core) evolve much more slowly, essentially preserving the initial shape and propagation speed until about 100 synoptic periods.

Summary
Contraction of westward-travelling nonlocal modons due to the vorticity filament emission

 

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