Estimation of extinction coefficients at 3.75 and 11.00 um from satellite measurements at 0.63 and 0.86 um.
Garcia de Quevedo, Margarita
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A method for estimating extinction coefficients in the near-infrared and 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 2.75 and 11.00 µm. 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 µm. The error reaches 82% for prediction at 11.00 µm at 60% relative humidity. The smallest error, less than 7% for all variations, is associated with the retrieval technique itself. Errors up to 25% in the estimated values for both the marine and rural models. Results indicate that the rural model at high values of relative humidity is affected the most with an error of 31% at a RH of 95% at 11.00 µm. Negative deviations in the marine particle size distribution give rise to large errors for ƛ = 11.00 µm. For 20% deviation, the error can be as high as 41%. The error decreases accordingly as the percent deviation is reduced.
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