Aerosol collection by Scots pine seedlings: design and application of a wind tunnel method [airborne particles, particle size, wind speed, forest ecosystems]
1981
Wiman, B. (Lund Univ. (Sweden). Dept. of Plant Ecology)
Coniferous forests collect airborne particles (aerosols) of natural as well as anthropogenic origin. The mechanisms of such inputs of potentially ecological significance cannot be understood from aerosol physics only but must be empirically studied to add information about the role of the plant structure itself. For this purpose a wind tunnel system and analytical methods were developed to enable exposure of pine seedlings to an artificially generated aerosol. The aerosol was characterized through membrane filtering, opto-electronic particle counting and cascade impactor sampling. Distributions of aerosol mass as a function of particle size were derived from applications of the wind tunnel method using the wind speed 2.5 m/s, ca. 81% relative humidity and an aerosol mass distribution centered around 1 mu-m technique and related to the aerosol mass concentration during the exposure. Results from applications of the wind tunnel method using the wind speed 2.5 m/s, ca. 81% relative humidity and an aerosol mass distribution centered around 1 mu-m aerodynamic diameter suggest an aerosol collection efficiency of pine needles of ca. 3 - 10('4) (corresponding to a deposition velocity of 0.07 cm/s). Some implications for aerosol deposition to pine forest ecosystems are indicated.
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