Analysis of evaporative fraction diurnal behaviour - IRD - Institut de recherche pour le développement Access content directly
Journal Articles Agricultural and Forest Meteorology Year : 2007

Analysis of evaporative fraction diurnal behaviour


Experimental studies indicate that evaporative fraction (EF), the ratio between the latent heat flux and the available energy at the land surface, is a normalized diagnostic that is nearly constant during daytime under fair weather conditions (so-called daytime self preservation). This study examines this observation and investigates contributions to the variability of EF due to environmental factors (air temperature, solar incoming radiation, wind velocity, soil water content or leaf area index). It is shown here that the phase difference between soil heat flux and net radiation needs to be characterized fully in application models that invoke EF daytime self-preservation. Further conditions under which the diurnally constant EF assumption can hold are also discussed.
Fichier principal
Vignette du fichier
007_Gentine_AFM.pdf (1.65 Mo) Télécharger le fichier
Origin Files produced by the author(s)

Dates and versions

ird-00389121 , version 1 (28-05-2009)



P. Gentine, D. Entekhabi, Ghani Chehbouni, Gilles Boulet, Benoît Duchemin. Analysis of evaporative fraction diurnal behaviour. Agricultural and Forest Meteorology, 2007, 143 (1), pp.13-29. ⟨10.1016/j.agrformet.2006.11.002⟩. ⟨ird-00389121⟩
2014 View
1006 Download



Gmail Mastodon Facebook X LinkedIn More