Validation of heat fluxes over the tropical atlantic: CPTEC coupled ocean-atmosphere model and observations / Validação dos fluxos de calor sobre o atlântico tropical: modelo acoplado oceano-atmosfera do CPTEC e observações

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

The goal of this work is to infer the importance of surface heat fluxes, estimated by several methods, in the determination of the Sea Surface Temperature (SST) fields in the tropical Atlantic using a set of general circulation ocean model Modular Ocean Model 3 (MOM 3) simulations and a Centro de Previsão de Tempo e Estudos Climáticos (CPTEC) coupled ocean-atmosphere model simulation. Initially the goals and motivations for the accomplishment of this work as well as a bibliographical revision about the variability of the Tropical Atlantic Ocean and its influence in the South American climate are presented. Comparative analyses between the observed solar short wave radiation time series of the Pilot Research Moored Array in the Tropical Atlantic (PIRATA) buoys and estimatives made from satellite images using the radiative transfer model Global Radiation version 1.2 (GL1.2) developed at the CPTEC and the model based on the International Satellite Cloud Climatology Project (ISCCP) data produced by the University of Maryland under the PATHFINDER program, as well as the National Centers for Environmetal Prediction - National Center for Atmospheric Research Reanalyses (NCEP-NCAR) and European Centre for Medium-Range Forecasts European Reanalyses 40 (ECMWF ERA40) reanalyses fields are performed. The radiative transfer models based on ISCCP imagery and the GL1.2 have shown higher correlations with the PIRATA buoys time series when comparing with the reanalysis fields. An oceanic and coupled numerical simulations study, using observed dynamic and thermodynamic forcing fields for the general circulation ocean model are also presented. Finally it is made a comparison between the SST and surface heat flux fields obtained from the numerical simulations over the tropical Atlantic and the observed National Oceanic & Atmospheric Administration (NOAA) Optimum Interpolation Sea Surface Temperature Analysis (OI SST) data and Comprehensive Ocean-Atmosphere Data Set (COADS) surface fluxes. The net heat flux has shown a significant error reduction for the simulations using solar radiation fields based on satellite estimates and/or the heat flux parametrization. The CPTEC coupled oceanatmosphere model presented smaller error magnitude in SST and heat fluxes comparing to the oceanic simulation forced by reanalysis fields only, except over the central basin, where the higher magnitude is probably related to lags in wind intensification and heat transport deficiencies in the oceanic component. In the conclusion a discussion about the comparative analysis is made and some suggestions of future researches are presented.

ASSUNTO(S)

sea surface temperature (sst) acoplamento meteorologia meteorology heat flux temperatura da superfície do mar (tsm) atlantic ocean oceano atlântico coupling interação oceano-atmosfera modular ocean model fluxo de calor air sea interactions

ACESSO AO ARTIGO

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