Absorption of solar radiation by water vapor in the atmosphere. Part I: a comparison between selected parameterizations and reference results

We investigate the impacts of an improved atmospheric absorption on radiative fluxes, atmospheric circulation and hydrological cycle for long-term GCM integrations. For these runs we use the operational version of the CPTEC AGCM and its enhanced version with a new solar radiation scheme. There is an 8% increase in the annual mean global average atmospheric absorption in the enhanced integration as compared with the operational model integration. The extra absorption is due to gases (0.5%), water vapor continuum (1.5%) and background aerosols (6%), which were not considered in the operational solar radiation scheme. The model overestimation of DJF precipitation over the SPCZ and SACZ regions is reduced by 0.5-1.0 mm day −1 and over the northern hemisphere storm tracks region by 0.5 mm day −1 . In the monthly time scale, the changes on the precipitation distribution over the SACZ region are found to be much larger ± 2-3mm day −1 . INPE ePrint: sid.inpe.br/mtc-m17@80/2007/11.26.12.45 v1 2007 1

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Impacts of a New Solar Radiation Parameterization on the CPTEC AGCM Climatological Features

Barbosa

Тарасова

Cavalcanti

2008

Journal of Applied Meteorology and Climatology

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Absorption of solar radiation by water vapor in the atmosphere. Part I: a comparison between selected parameterizations and reference results

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Impacts of a New Solar Radiation Parameterization on the CPTEC AGCM Climatological Features

Impacts of a New Solar Radiation Parameterization on the CPTEC AGCM Climatological Features

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