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Bowen ratioA Bowen ratio is the ratio of energy fluxes from one medium to another by sensible and latent heating respectively. It is calculated by the equation
Additional recommended knowledgewhere Qh is sensible heating and Qe is latent heating. The quantity was named by Harald Sverdrup after Ira Sprague Bowen (1898–1973), an astrophysicist whose theoretical work on evaporation to air from water bodies made first use of it, and it is used most commonly in meteorology and hydrology. In this context, when the magnitude of B is less than one, a greater proportion of the available energy at the surface is passed to the atmosphere as latent heat than as sensible heat, and the converse is true for values of B greater than one. As , however, B becomes unbounded making the Bowen ratio a poor choice of variable for use in formulae, especially for arid surfaces. For this reason the evaporative fraction is sometimes a more appropriate choice of variable representing the relative contributions of the turbulent energy fluxes to the surface energy budget. The Bowen ratio is related to the evaporative fraction, EF, through the equation,
References
Categories: Thermodynamics | Atmospheric thermodynamics |
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Bowen_ratio". A list of authors is available in Wikipedia. |