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Contact Admin. Upwelling regime off the Cabo Frio region in Brazil and impact on acoustic propagation. This work introduces a description of the complex upwelling regime off the Cabo Frio region in Brazil and shows that ocean modeling, based on the feature-oriented regional modeling system FORMS technique, can produce reliable predictions of sound speed fields for the corresponding shallow water environment.
This work also shows, through the development of simulations, that the upwelling regime can be responsible for the creation of shadow coastal zones, in which the detection probability is too low for an acoustic source to be detected. The development of the FORMS technique and its validation with real data, for the particular region of coastal upwelling off Cabo Frio , reveals the possibility of a sustainable and reliable forecast system for the corresponding variable in space and time underwater acoustic environment.
An observational study of the evolution of the atmospheric boundary-layer over Cabo Frio , Brazil. Directory of Open Access Journals Sweden. For this purpose, radiosounding data collected in two experiments made during the austral summer upwelling case and austral winter no upwelling case are analysed. The results show that during the austral summer, cold waters that crop up near the Cabo Frio coast favour the formation of an atmospheric stable layer, which persists during the upwelling episode.
Due to the low SSTs, the descending branch of the sea-breeze circulation is located close to the coast, inhibiting the development of a mixed layer mainly during the day.
At night, with the reduction of the land-sea thermal contrast the descending motion is weaker, allowing a vertical mixing. The stable ABL favours the formation of a low level jet, which may also contribute to the development of a nocturnal atmospheric mixed layer.