as pdf

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as pdf

Evaporation

• Transfer of H 2 O from liquid to vapor phase

– Diffusive process driven by

• Saturation (vapor density) gradient ~ (r s – r a )

• Aerial resistance ~ f(wind speed, temperature)

• Energy to provide latent heat of vaporization (radiation)

• Transpiration is plant mediated evaporation

– Same result (water movement to atmosphere)

• Summative process = evapotranspiration (ET)

– Dominates the fate of rainfall

• ~ 95% in arid areas

• ~ 70% for all of North America

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