Analysis of evaporative fraction diurnal behaviour

Abstract : 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.
Document type :
Journal articles
Complete list of metadatas

Cited literature [52 references]  Display  Hide  Download

https://hal.ird.fr/ird-00389121
Contributor : Dominique Bruel <>
Submitted on : Thursday, May 28, 2009 - 11:22:46 AM
Last modification on : Friday, October 11, 2019 - 8:22:25 PM
Long-term archiving on : Thursday, June 10, 2010 - 8:02:07 PM

File

007_Gentine_AFM.pdf
Files produced by the author(s)

Identifiers

Collections

Citation

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

Share

Metrics

Record views

1484

Files downloads

651