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SPARSE CANOPY SYMPOSIUM INTRODUCTION

Mixture of Time Scales in Evaporation

Desorption and Self-Similarity of Energy Fluxes

^a St. Anthony Falls Lab., Dep. of Civil Engineering, Univ. of Minnesota, Minneapolis, MN USA
^b Dep. of Geography and Environmental Eng., The Johns Hopkins Univ., Baltimore, MD USA
^c Dep. of Civil Eng., Texas A&M, College Station, TX USA
^d Dep. of Civil Engineering, TU-Graz, Graz, Austria

mbparlange{at}jhu.edu

The time evolution of evaporation from a bare soil, over a 9-d period following irrigation, is described by a combination of daily and hourly drying patterns. From the second day, the daily evaporation shows a second stage of drying that can be described as a desorptive process (evaporation proportional to (t - t_o)^-1/2, where t is time in days and t_o is the day when the second stage starts). The short time (hourly) evaporation rate can be modeled on the basis of a type of self-similarity in the energy balance components. Combining the evaporative flux behavior at the two time scales, desorption at the daily timescale and self-similarity for the diurnal variations, a robust description of evaporation for drying land surfaces is obtained. This approach is tested using accurate measurements of the different components of the energy balance at the soil surface, obtained at 20-min intervals. The model accurately describes the time evolution of the evaporative flux and could be used for the disaggregation of daily or weekly evaporation into hourly values.

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