Influência das oscilações subinerciais na variabilidade de temperatura na plataforma continental sudeste do Brasil

Abstract

The impact of subinertial waves originated from cold fronts on the variability of sea temperature in Southeast Brazilian Continental Shelf was investigated through two numerical simulations with high spatial resolution. In order to evaluate the behavior of these waves with and without in uence of frontal systems, the experiments were con gured with daily (Experiment 1) and monthly (Experiment 2) atmospheric forcing respectively. In each simulation was avaliated a typical and an extreme event previously selected and characterized. In general, a tendency to ocean cooling on the surface and into greater depths along the propagation of the oscillations for NE was observed in both experiments, mainly in Expt.1. In this experiment was observed the decline in Sea Surface Temperature (SST) of up to 0.2 ◦C/day during the typical event and up to 0.6 ◦C/day on inner continental shelf during the extreme event. The cooling e ect was mitigated after Ilha Bela, except in extreme event when the temperature decline spreads to Cabo Frio. The greatest contribution in heat conservation equation was the vertical advective term in Experiment 1 and the horizontal advective term in Experiment 2, indicating the greater in uence of the interaction in the ocean-atmosphere boundary layer and of the wave propagation respectively. The largest negative contribution in the total surface heat ux balance was associated with the lower incidence of solar radiation in the typical event and with turbulent heat uxes, especially latent heat, in the extreme event. In the typical and extreme events selected, the heat transfer from the ocean to the atmosphere was observed to be about 20 W/m2 and 220 W/m2 respectively.