| Abstract from DBPedia | The Bowen ratio is used to describe the type of heat transfer for a surface that has moisture. Heat transfer can either occur as sensible heat (differences in temperature without evapotranspiration) or latent heat (the energy required during a change of state, without a change in temperature). The Bowen ratio is generally used to calculate heat lost (or gained) in a substance; it is the ratio of energy fluxes from one state to another by sensible heat and latent heating respectively. The ratio 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.ボーエン比（ボーエンひ、英語: Bowen ratio）とは、を表す指標である。天文学者アイラ・ボーエンに由来する。 （sensible heat flux）を、（latent heat flux）を（は水の蒸発時に必要な潜熱、は水の蒸発量）とすると、ボーエン比は以下のように表される。 一般にボーエン比は乾燥地域で大きくなり、湿潤地域や水域で小さくなる。乾燥地域では水分の蒸発量が小さく、潜熱フラックスの値が小さくなるため顕熱フラックスが大きくなる傾向にある。一方、湿潤地域では潜熱フラックスの値が大きくなる。 (Source: http://dbpedia.org/resource/Bowen_ratio) |
