A tendency equation for evaporation over a convective boundary layer

Research output: Chapter in Book/Report/Conference proceedingAbstract

Abstract

A tendency equation for evaporation in a growing convective boundary layer (CBL) is derived. This derivation allows for a process-based decomposition in which each involved land-atmosphere feedback accounts for one term in the equation. Therefore, the influence of entrainment processes on evaporation can be quantified and separated from other land-atmosphere feedbacks. An expression for equilibrium evaporation is derived from the tendency equation and it is investigated how the magnitude of the equilibrium evaporation and the involved time scales depend on the land-atmosphere feedbacks. It is shown that entrainment can enhance the equilibrium evaporation significantly. In addition, the relative enhancement explains very well the characteristic Priestley-Taylor coefficient of 1.26 over well-watered surfaces. Entrainment increases the characteristic time scale of the system if the evaporation exceed
Original languageEnglish
Title of host publicationEMS Annual Meeting Abstracts, Eighth Annual Meeting of the European Meteorological Society, Amsterdam, 29 September-3 October 2008
PublisherEMS
PagesA-00148
Publication statusPublished - 2008
EventEighth Annual Meeting of the European Meteorological Society -
Duration: 29 Sep 20083 Oct 2008

Conference

ConferenceEighth Annual Meeting of the European Meteorological Society
Period29/09/083/10/08

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    van Heerwaarden, C. C., & Vilà-Guerau de Arellano, J. (2008). A tendency equation for evaporation over a convective boundary layer. In EMS Annual Meeting Abstracts, Eighth Annual Meeting of the European Meteorological Society, Amsterdam, 29 September-3 October 2008 (pp. A-00148). EMS.