Using HSB sensor to retrieval precipitable water and rainfall / Um estudo sobre o uso do sensor HSB na estimativa da água precipitável e da precipitação

AUTOR(ES)
DATA DE PUBLICAÇÃO

2004

RESUMO

This work exploits the capability of the Humidity Sensor Brazil (HSB) channel in retrieving Integrated Water Vapor Content and estimating precipitation. The data analyses of this study have been carried out in two stages: firstly using simulations of the HSB channel brightness temperatures from RTTOV and Kummerow radiative models, and secondly, using data from the RaCCI/LBA experiment in Rondônia, during the months of September and October 2002. The results show the potential of 183 ± 1, 3 e 7 GHz channels in retrieving upper tropospheric water vapor for clear sky or low level cloud cover. The estimated integrated water vapor content in the atmosphere using HSB channels was compromised due to the absence of troposphere low level information, where most of the water vapor is concentrated. The 150 GHz channel, which has the maximum peak of its function weight next the surface, is strongly influenced by the surface emissivity. The analyses of precipitation estimation show that it is possible to fit a precipitation curve as a function of brightness temperature and find significant correlation among theses two variables. The 150 GHz channel is the best HSB channel to derive precipitation; however, its signal is weak when high rain rates are present. Nevertheless, the 150 GHz and 183 ± 7 GHz channels are appropriated to deduce rainfall from low rain rate situation.

ASSUNTO(S)

modelos de transferência radiativa hbs microwaves frequences remote sensing meterologia estimativa de precipitação freqüências de microondas radiative transfer models rainfall estimates sensoriamento remoto meteorology

ACESSO AO ARTIGO

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