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Choi, YS, Ho, CH (2009). Validation of cloud property retrievals from MTSAT-1R imagery using MODIS observations. INTERNATIONAL JOURNAL OF REMOTE SENSING, 30(22), 5935-5958.

A cloud property retrieval algorithm optimized for five channels (centred at 0.6, 3.7, 6.7, 10.8, and 12.0 mu m) has been explored for application to onboard meteorological radiometers on geostationary satellites; however, its validity remains to be established. Here, we present validation results for the cloud properties retrieved by the developed algorithm from the full-disk imagery of the Multi-functional Transport Satellite (MTSAT-1R) for August 2006. The considered cloud properties include cloud phase (CP), cloud optical thickness (COT), effective radius (ER) and cloud top pressure (CTP). Their one-month averages, daily variations, and respective collocated values are compared with the Moderate Resolution Imaging Spectroradiometer cloud data. Our validation results show that an additional 6.7 mu m brightness temperature test in CP retrieval identifies water and ice phases that may be overlooked in the 10.8- and 12.0-mu m bands. Our method to extract cloud-reflected radiances at the 0.6- and 3.7-mu m bands contributes to the accuracy of the COT for values between 5 and 60, and the ER for values less than 40 mu m. Estimating high-cloud top pressure from the radiance ratio in the 6.7- and 10.8-mu m bands remarkably reduces (by up to 70%) large uncertainties in the CTP, which may be found in the presence of high thin cirrus clouds.



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