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Multiple Equilibria and Oscillatory Modes in a Mid-latitude Ocean-forced Atmospheric Model : Volume 19, Issue 5 (06/09/2012)

By Deremble, B.

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Book Id: WPLBN0003973734
Format Type: PDF Article :
File Size: Pages 21
Reproduction Date: 2015

Title: Multiple Equilibria and Oscillatory Modes in a Mid-latitude Ocean-forced Atmospheric Model : Volume 19, Issue 5 (06/09/2012)  
Author: Deremble, B.
Volume: Vol. 19, Issue 5
Language: English
Subject: Science, Nonlinear, Processes
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Simonnet, E., Ghil, M., & Deremble, B. (2012). Multiple Equilibria and Oscillatory Modes in a Mid-latitude Ocean-forced Atmospheric Model : Volume 19, Issue 5 (06/09/2012). Retrieved from

Description: Florida State University, 117 N. Woodward Ave., Tallahassee, FL 32306-4320, USA. Atmospheric response to a mid-latitude sea surface temperature (SST) front is studied, while emphasizing low-frequency modes induced by the presence of such a front. An idealized atmospheric quasi-geostrophic (QG) model is forced by the SST field of an idealized oceanic QG model. First, the equilibria of the oceanic model and the associated SST fronts are computed. Next, these equilibria are used to force the atmospheric model and compute its equilibria when varying the strength of the oceanic forcing.

Low-frequency modes of atmospheric variability are identified and associated with successive Hopf bifurcations. The origin of these Hopf bifurcations is studied in detail, and connected to barotropic instability. Finally, a link is established between the model's time integrations and the previously obtained equilibria.

Multiple equilibria and oscillatory modes in a mid-latitude ocean-forced atmospheric model

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