estudo numérico da interação entre convecção rasa e radiação com ênfase no ciclo diurno do balanço de energia à superfície na amazônia a numeric study of the interaction between shallow convection and radiation with emphasis in the diurnal cycle of the surface energy budget in amazonia
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ID: 240269
2009
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Abstract
Estuda-se neste artigo o efeito da convecção rasa no ciclo diurno do balanço de energia à superfície na Amazônia. O enfoque foi dado ao papel do sombreamento, devido aos cúmulos rasos na configuração do forçamento convectivo à superfície. Um esquema para o cálculo da cobertura de cúmulos rasos foi implementado no modelo BRAMS. Foram executados dois experimentos: um com convecção rasa e sem interação com a radiação, e o segundo com convecção rasa e interação com a radiação. Os resultados mostraram que a consideração da interação entre convecção rasa e radiação produz simulações mais realistas. Isso foi mais pronunciado por volta do meio-dia local e início da tarde, quando os cúmulos rasos estão com sua atividade máxima. Os fluxos e a cobertura foram bastante sensíveis às variações no forçamento radiativo. Apesar da melhoria da qualidade dos fluxos, do ponto de vista qualitativo, ficou evidente a deficiência do modelo em representar esses fluxos nas primeiras e últimas horas do ciclo diurno.
The effect of shallow convection on the diurnal cycle of the surface energy budget is investigated. Focus is on the role of the cloud shading on the establishment of the surface convective forcing. A scheme for calculating the shallow cumulus cover was implemented in the BRAMS atmospheric model. Two sets of experiments were performed: in the first experiment, the model had no interaction between shallow convection and radiation, and in the second type of experiment shallow convection interacts with radiation. Results show that the consideration of the interaction between shallow cumulus and radiation leads to more realistic simulations. This is more pronounced around the local noon and early afternoon, when the shallow cumulus activity reaches a maximum. The surface fluxes and the cumulus cover were very sensitive to the variations in the radiative forcing. Even though, from a qualitative viewpoint, there is an improvement on the quality of the simulated fluxes, it became evident a model flaw in representing these fluxes during the first hours of the diurnal cycle.
The effect of shallow convection on the diurnal cycle of the surface energy budget is investigated. Focus is on the role of the cloud shading on the establishment of the surface convective forcing. A scheme for calculating the shallow cumulus cover was implemented in the BRAMS atmospheric model. Two sets of experiments were performed: in the first experiment, the model had no interaction between shallow convection and radiation, and in the second type of experiment shallow convection interacts with radiation. Results show that the consideration of the interaction between shallow cumulus and radiation leads to more realistic simulations. This is more pronounced around the local noon and early afternoon, when the shallow cumulus activity reaches a maximum. The surface fluxes and the cumulus cover were very sensitive to the variations in the radiative forcing. Even though, from a qualitative viewpoint, there is an improvement on the quality of the simulated fluxes, it became evident a model flaw in representing these fluxes during the first hours of the diurnal cycle.
| Reference Key |
souza2009revistaestudo
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| Authors | ;Enio Pereira de Souza;Zilurdes Fonseca Lopes;Taciana Lima Araujo |
| Journal | Applied microbiology and biotechnology |
| Year | 2009 |
| DOI |
10.1590/S0102-77862009000200005
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