Estimativa de emissividade da superficie continental a partir de dados de satelite em microondas / Microwave land surface emissivities estimated from SSM/I observations

AUTOR(ES)
DATA DE PUBLICAÇÃO

1999

RESUMO

Microwave emissivities of land surface were estimated from the Special Sensor Microwave/Imager (SSM/I) observations using the 19 and 85 GHz channels, and surface skin temperature data derived from the Tiros Operacional Vertical Sounder (TOVS). The atmospheric contribution was calculated from simulations of the Atmospheric Transmission at Millimetric and submillimetric wavelengths (ATM) model. The microwave emissivities over Brazil were estimated for July and December, 1997, using the Radiative Transfer Equation (RTE). The emissivity polarization difference was performed to verify the land surface roughness patterns. The results show that the regional patterns and the vegetation seasonal changes retrieved from the land surface emissivities are compatible with the large scale topography and vegetation distributions. Thus, the estimation of the microwave emissivities of land surface may be used to retrieve some atmospheric parameters (clouds) and monitor the land surface (for instance, vegetation and floods)m.

ASSUNTO(S)

emissividade radiacao polarizada microondas transferencia radiadiativa rugosidade da superficie meteorologia por satelite temperatura da superficie continental

ACESSO AO ARTIGO

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