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Source: EPA, User’s Guide for the AERMOD Meteorological Preprocessor (AERMET) , http://www.epa.gov/ttn/scram/metobsdata_procaccprogs.htm#aermet . November 2004, 

The Bowen ratio, an indicator of surface moisture, is the ratio of the sensible heat flux to the latent heat flux. Although the Bowen ratio can have significant diurnal variation, it is used to determine the planetary boundary layer parameters for convective conditions Table D - 3 ( Bowen Ratio for Various Land Uses ) provides typical Bowen Ratio for a variety of land uses and moisture conditions. A typical airport environment has a Bowen Ratio of 2.0 but it varies by season and surface moisture conditions. 

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