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Mechanisms of Evaporation from Soil with a Dry Surface by Tetsuo Kobayashi; Wenjun He; Hideyuki Nagai is a Environmental Science article available to read on EtoBox.

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Evaporation from bare soil proceeds in three stages as the soil surface dries. The formation of a dry surface layer (DSL), where water moves only in the vapour phase, is the most remarkable and symbolic feature of the last stage, and the following phenomena, observed recently, seem to be closely related to it: (a) humidity inversion across the soil surface. Water vapour density increases sharply from just under the dry surface to just above it in the daytime on ®ne days; (b) humidity inversion in the surface boundary layer. The mixing ratio of water vapour increases with height, at least, in the 1 to 20 m layer in desert areas on ®ne days; (c) countergradient ̄ow of water vapour. Evaporation occurs from soil with a dry surface under the humidity inversion conditions, so that water vapour is transported against its density gradient near the surface in the daytime on ®ne days. A hypothesis is proposed to explain these phenomena, such that hot, dry soil surfaces produce dry air, or the humidity inversion and make the water vapour moving upwards in the DSL go through the surface against its density gradient by thermal diusion. The hot, dry air which is made and trapped in the uppermos

Who reads Mechanisms of Evaporation from Soil with a Dry Surface?

Author

Tetsuo Kobayashi; Wenjun He; Hideyuki Nagai

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0885-6087)

Published

1998

Language

EN

Field

Environmental Science (Physical Sciences)