Boundary-Layer Meteorology

, Volume 71, Issue 3, pp 235–245 | Cite as

Relation between equilbrium evaporation and the saturation pressure budget

  • Alan K. Betts


The limiting surface Bowen ratios are calculated which maintain mixed-layer saturation pressure and relative humidity, both with and without boundary-layer entrainment. The equations are formally the same as those of Culf (1994) for equilibrium evaporation, but differ numerically because the coefficients are calculated at the mixed-layer saturation temperature (at the lifting condensation level) rather than at the surface temperature. The diurnal cycle over land is used to illustrate the value of these constraints.


Evaporation Relative Humidity Surface Temperature Diurnal Cycle Saturation Temperature 
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Copyright information

© Kluwer Academic Publishers 1994

Authors and Affiliations

  • Alan K. Betts
    • 1
  1. 1.PittsfordUSA

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