Measurements of cloud water deposition on vegetation using a lysimeter and a flux gradient technique

D. FOWLER, A. P. MORSE, M. W. GALLAGHER, T. W. CHOULARTON

Research output: Contribution to journalArticlepeer-review

Abstract

Vertical gradients in wind velocity and liquid water content (LWC) provided cloud deposition fluxes of typically 10 mg m-2 s-1 and deposition velocities (vg) in the range 21 to 39 mm s-1 for droplets with a number mean radius in the range 6 to 7 μm. In these conditions, the aerodynamic resistance provided the major limitation to deposition rates contributing 60% of the overall transfer resistance. Simultaneous measurements of net water exchange between the atmosphere and the ground using a lysimeter showed that the bulk of the water (typically 80%) was deposited as a vapour flux onto frozen soil within the lysimeter. The measurements show that cloud water deposition at Great Dun Fell (altitude 847 m asl) may increase annual wet deposited SO4 2-, NO3 -, H+ and NH4 + by 12%, but if such high altitude sites were afforested, the increase would be 44%. -from Authors

Original languageEnglish
Pages (from-to)285-293
Number of pages9
Journal Tellus. Series B: Chemical and Physical Meteorology
Volume42 B
Issue number3
DOIs
Publication statusPublished - 1 Jan 1990

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