Method to estimate the emissivity from NOAA-AVHRR channel 3 in order to extract a distribution of effective droplet radius of stratocumulus clouds

Fernando Rosa; Felix Herrera; Juan C. Perez; Albano Gonzalez

doi:10.1117/12.332708

14 December 1998 Method to estimate the emissivity from NOAA-AVHRR channel 3 in order to extract a distribution of effective droplet radius of stratocumulus clouds

Fernando Rosa, Felix Herrera, Juan C. Perez, Albano Gonzalez

Author Affiliations +

Proceedings Volume 3495, Satellite Remote Sensing of Clouds and the Atmosphere III; (1998) https://doi.org/10.1117/12.332708
Event: Remote Sensing, 1998, Barcelona, Spain

Abstract

In this work, a method to estimate the emissivity distribution is developed for stratocumulus clouds paying special attention to water vapor over these clouds. The main aim is to obtain an approximate distribution of effective radius for optically thick stratocumulus clouds. This method is based on night imagery obtained from the NOAA-AVHRR IR channels, and an atmospheric radiative transfer model that makes use of the discrete ordinate method called DISORT. We have solved the problem of the local estimation, for the Canary Islands, of the influence of the water vapor over the stratocumulus level. Finally we associate the emissivity distribution with the distribution of the droplet effective radius. This allows us to estimate a unique effective radius for the cloud taking advantage of statistic in the image in order to avoid the non-monotonous behavior of emissivity with the droplet effective radius in the 3.7 micrometers band. The results are compared with satellite data from NOAA-14.

Citation Download Citation

Fernando Rosa, Felix Herrera, Juan C. Perez, and Albano Gonzalez "Method to estimate the emissivity from NOAA-AVHRR channel 3 in order to extract a distribution of effective droplet radius of stratocumulus clouds", Proc. SPIE 3495, Satellite Remote Sensing of Clouds and the Atmosphere III, (14 December 1998); https://doi.org/10.1117/12.332708

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