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Original Research Papers

Formula for a baroclinic adjustment theory of climate

Authors:

Isabella Bordi,

Department of Physics, University of Rome ‘L a Sapienza’, Piazzale AldoMoro 2, 00185 Rome, IT
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Alessandro Dell’Aquila,

Department of Physics, University of Rome ‘L a Sapienza’, Piazzale AldoMoro 2, 00185 Rome, IT
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Antonio Speranza,

Department of Physics, University of Rome ‘L a Sapienza’, Piazzale AldoMoro 2, 00185 Rome, IT
About Antonio
On leave of absence from the Department of Mathematics and Physics, University of Camerino, Camerino, Italy.
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Alfonso Sutera

Department of Physics, University of Rome ‘L a Sapienza’, Piazzale AldoMoro 2, 00185 Rome, IT
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Abstract

Recently, a theory relating baroclinic neutrality and mid latitudes tropopause height has been proposed. However, GCM results have shown that the dependence of the theory on external parameters is not consistent with that displayed by these numerical experiments. In the present paper we suggest an analytic formula for baroclinic adjustment to the neutrality of Eady waves through tropopause modification. This formula extends considerably the above mentioned theory by taking into account both a simple representation of the stratosphere and the topography. These modifications alter the tropopause condition for a baroclinically neutral state and its sensitivity to the external parameters. In particular, the topography introduces a dependence on the tropospheric vertical wind shear of the neutrality condition. This feature is notpresent in other models that assume a background state with a zero potential vorticity gradient in the troposphere. We show, furthermore, that the modified neutrality condition has sensitivities that may resemble those displayed by GCM simulations, with respect to the parameters defining the background flow.

How to Cite: Bordi, I., Dell’Aquila, A., Speranza, A. and Sutera, A., 2002. Formula for a baroclinic adjustment theory of climate. Tellus A: Dynamic Meteorology and Oceanography, 54(3), pp.260–272. DOI: http://doi.org/10.3402/tellusa.v54i3.12143
  Published on 01 Jan 2002
 Accepted on 3 Dec 2001            Submitted on 6 Mar 2001

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