Pollution transfer to moor by occult deposition

Abstract

The flux of fog droplets to a moor (elevation 330 m) in central England, measured by the fluxprofile technique, was usually less than 15 mg m⁻²s⁻¹. On average, turbulent deposition accounted for a third of this flux. The total flux depended on properties of the fog (droplet size and liquid water concentration) rather than parameters of eddy transfer (friction velocity or turbulent deposition velocity). The annual deposits of acidity, nitrogen (as nitrate) and sulphur were estimated to. be 7, 50 and 80 mg m⁻², respectively. Occult deposition of sulphur represented only 1.5% of the total (dry plus wet) deposition to the moor.