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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 25, issue 8
Ann. Geophys., 25, 1735–1744, 2007
https://doi.org/10.5194/angeo-25-1735-2007
© Author(s) 2007. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 25, 1735–1744, 2007
https://doi.org/10.5194/angeo-25-1735-2007
© Author(s) 2007. This work is distributed under
the Creative Commons Attribution 3.0 License.

  29 Aug 2007

29 Aug 2007

An observational study of the evolution of the atmospheric boundary-layer over Cabo Frio, Brazil

S. H. Franchito1, V. Brahmananda Rao1, T. O. Oda2, and J. C. Conforte1 S. H. Franchito et al.
  • 1Centro de Previsão de Tempo e Estudos Climáticos, CPTEC/INPE Instituto Nacional de Pesquisas Espaciais, INPE CP 515, 12245-970, São José dos Campos, SP, Brazil
  • 2Instituto de Estudos do Mar Almirante Paulo Moreira Rua Kioto, 253, 28930-000, Arraial do Cabo – RJ – Brazil

Abstract. The effect of coastal upwelling on the evolution of the atmospheric boundary layer (ABL) in Cabo Frio (Brazil) is investigated. 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. During the austral winter, due to the higher SSTs observed near the coast, the ABL is less stable compared with that in the austral summer. Due to warming, a mixed layer is observed during the day. The observed vertical profiles of the zonal winds show that the easterlies at low levels are stronger in the austral summer, indicating that the upwelling modulates the sea-breeze signal, thus confirming model simulations.

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