Estimation of Extinction Coefficients at 3.75 and 11.00 Micrometers from Satellite Measurements at 0.63 and 0.86 Micrometer

摘要

A method for estimating extinction coefficients in the near-infrared and intermediate infrared wavelengths from satellite measurements in the visible was developed. Five tests were devised to examine the limits and sensitivity of the model. The first test studied the error inherent in the retrieval of the parameters which are needed to describe the distribution of atmospheric particles and are direct inputs for the calculation of extinction at 3.75 and 11.00 micrometers. Also studied were errors associated with uncertainties in the extinction values, uncertainties in relative humidity values, deviations of particle size distribution from the model and effects of high winds on the aerosol distribution. Results indicate that the biggest error results when wind generated aerosols change the particle size distribution especially at radii larger than 2 micrometers. Keywords: Visible, infrared, extinction, aerosols, satellite, techniques.