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Water Vapor Pressure Model for Cloud Vertical Structure Detection in Tropical Region

A new method using water vapor pressure (WVP) from a radiosonde profile to determine the cloud vertical structure for the tropical region is proposed in this paper. This includes both the cloud base height and the cloud occurrences at different levels in the atmosphere. Our study shows that the presence of clouds depends on the following criterion: the measured WVP is larger than the critical WVP at the same level. The applicable level is found to be within the range of 300-12 000 m. The estimated cloud vertical structure using the proposed method is compared with the Salonen and Uppala (SU) model, the ceilometer data, and two kinds of meteorological observation data, namely, SYNOP and METAR. The proposed model shows a higher accuracy level of prediction of the cloud vertical structure as compared with the existing SU model.