77 Response in sea surface temperature (SST) in a model of oceanic mixing layer coupled to BRAMS

Tuesday, 10 July 2012
St. George (Westin Copley Place)
Ana Cristina Pinto de Almeida Palmeira, Brazilian Naval Directorate of Hydrography and Navigation, NiterĂ³i, Rio de Janeiro, Brazil; and R. D. Camargo and R. M. D. J. P. Palmeira

In order to contribute to the understanding of the processes of ocean-atmosphere interaction that occur in the Southwest Atlantic, this study aims to compare the evolution of SST (Sea Surface Temperature) provided by a constant mask to another resulting from the variation of the thickness of the Oceanic Mixed Layer (OML) arising out of the ocean circulation model HYCOM (Hybrid circulation model), noting the importance of variation of OML in the surface heat fluxes under the influence of different weather patterns. This model achieved a good correlation with the data collected from XBT (temperature and depth of the OML), serving as a good indicator for comparisons.

For this purpose, we used a simplified model of OML, inserted a sub-rotine of BRAMS (Brasilian Regional Atmospheric System), to assess the variation in active SST (modified by OML) at each time step and the variation of fluxes of latent and sensible heat in air-sea interface and investigate the physical mechanisms involved. The OML modeled by BRAMS was characterized by narrowing during the atmospheric trajectories of cyclones, but has not indicated a significant deepening of the rear following the cyclone. There was a narrowing of the average standard of active OML, probably due to the absence of the term TKE (Turbulent Kinetic Energy) by the current shear.

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