Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

Full text
Author(s):
Raupp, Carlos F. M. [1] ; Dias, Pedro L. Silva [1]
Total Authors: 2
Affiliation:
[1] Univ Sao Paulo, Dept Atmospher Sci, Inst Astron Geophys & Atmospher Sci, Sao Paulo - Brazil
Total Affiliations: 1
Document type: Journal article
Source: TELLUS SERIES A-DYNAMIC METEOROLOGY AND OCEANOGRAPHY; v. 62, n. 5, p. 706-718, OCT 2010.
Web of Science Citations: 4
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 function mimicking 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. (AU)

FAPESP's process: 06/53606-0 - Interaction between atmospheric equatorial waves through resonance with wet convection
Grantee:Carlos Frederico Mendonça Raupp
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 09/11643-4 - Multi-scale interactions in the atmosphere
Grantee:Carlos Frederico Mendonça Raupp
Support Opportunities: Research Grants - Young Investigators Grants