ANALYSIS OF THE OCEAN-ATMOSPHERE COUPLING AT THE SYNOPTIC SCALE ALONG 33 °S ON 19 AND 20 JUNE 2012
Keywords:Marine atmospheric boundary layer. Ocean-atmosphere interaction. Rio Grande do Sul continental shelf. Heat fluxes. Oceanographic fronts.
The southern coast of Brazil is marked during winter by the presence of an oceanographic front between the Brazil Current (BC) and the Brazilian Coastal Current (BCC). The BC/BCC oceanographic front imprints intense thermal gradients between the cold (BCC) waters of the continental shelf and the warm (BC) waters of the deep ocean. This work analyses, for the first time in the known literature, the ocean-atmosphere coupling using observational data taken by ship during 19-20 June 2012 along a transect off the coast of RS State, Brazil. During the period when the data were collected, a cold (post-frontal) air mass penetrated the study region causing an elevation of the atmospheric pressure and a diminution of the air temperature. Data from radiosondes launched in both sides of the oceanographic front indicate an atmospheric boundary layer thicker and more turbulent above the BC in respect to the BCC. The heat fluxes were positive along the entire transect although presenting a big variation in magnitude. Simultaneos in situ observations of both oceanographic and meteorological parameters are necessary for the understanding of the coupled ocean-atmosphere system, having primal importance for the weather prediction.
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