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Stratocumulus parameter retrieval using MODIS nighttime imagery: a theoretical approach

This work is a preliminary study of the viability of retrieving macro physical and micro physical cloud parameters from nighttime radiances provided by MODIS sensor, onboard Terra spacecraft. It is based on the analysis of the sensitivity of every MODIS IR band to each of the parameters that describe the different layers composing the earth-cloud-atmosphere system. IN order to make this analysis, an atmospheric radiative transfer model that makes use of the discrete ordinates method DISORT is employed. Multiple simulations are performed for a great variety of clouds and atmospheric conditions, taking into account the main absorbers in each band. As a first result, the more adequate bands for our purpose are select and, using these channels, the proposed method extracts the parameters characterizing the different layers through a numerical inversion of the radiative model based on an evolutionary method for solving optimization problems called scatter search. In addition, a sensitivity analysis is carried out in order to estimate the impact on the retrieved values of the uncertainties in model inputs and assumptions.