Characterization of Natural Aerosol in Western Europe and Investigation of Deposition to Irregular Topography
UNIVERSITY OF MANCHESTER INST OF SCIENCE AND TECHNOLOGY (UNITED KINGDOM) DEPT OF PURE AND APPLIED PHYSICS
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Measurements have been made of the deposition of cloud droplets and dissolved chemical species to a grass moorland vegetation. Measurements of liquid water fluxes have been made by the gradient technique using Knollenberg FSS probes and by a weighing lysimeter. Deposition velocities for cloud liquid water in the range 0.1 to 0.24 gcu. m at 1.0 were close to those for momentum. The FSS probes enabled the determination of deposition velocities as a function of droplet size. It was found that the deposition velocity increased with droplet radius from 2.5 microns to 6.5 microns radius. Between 6.5 and 12.5 microns radius deposition velocities exceeded those for momentum but decreased sharply between 12.5 and 15.5 microns. In periods of thin cloud 0.1 microns evaporation from the surface occurred despite continued deposition.