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Original Research Papers

Interaction of equatorial waves through resonance with the diurnal cycle of tropical heating

Authors:

Carlos F. M. Raupp ,

Department of Atmospheric Sciences, Institute of Astronomy, Geophysics and Atmospheric Sciences, University of Sao Paulo, São Paulo/SP; Institute for Theoretical Physics, UNESP – Sao Paulo State University, P.O. Box 70532-2, São Paulo, SP, 01156-970, BR
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Pedro L. Silva Dias

Department of Atmospheric Sciences, Institute of Astronomy, Geophysics and Atmospheric Sciences, University of Sao Paulo, São Paulo/SP, BR
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Abstract

In this work, a new theoretical mechanism is presented in which equatorial Rossby and inertio-gravity wave modes may interact with each other through resonance with the diurnal cycle of tropical deep convection.We have adopted the two-layer incompressible equatorial primitive equations forced by a parametric heating that roughly represents deep convection activity in the tropical atmosphere. The heat source was parametrized in the simplest way according to the hypothesis that it is proportional to the lower-troposphere moisture convergence, with the background moisture state functionmimicking the structure of the ITCZ. In this context, we have investigated the possibility of resonant interaction between equatorially trapped Rossby and inertio-gravity modes through the diurnal cycle of the background moisture state function. The reduced dynamics of a single resonant duo shows that when this diurnal variation is considered, a Rossby wave mode can undergo significant amplitude modulations when interacting with an inertio-gravity wave mode, which is not possible in the context of the resonant triad non-linear interaction. Therefore, the results suggest that the diurnal variation of the ITCZ can be a possible dynamical mechanism that leads the Rossby waves to be significantly affected by high frequency modes.

How to Cite: Raupp, C.F.M. and Silva Dias, P.L., 2010. Interaction of equatorial waves through resonance with the diurnal cycle of tropical heating. Tellus A: Dynamic Meteorology and Oceanography, 62(5), pp.706–718. DOI: http://doi.org/10.1111/j.1600-0870.2010.00463.x
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  Published on 01 Jan 2010
 Accepted on 27 Apr 2010            Submitted on 5 Aug 2009

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