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Dry Deposition of Ammonia at Environmental Concentrations on Selected Plant Species

Dry Deposition of Ammonia at Environmental Concentrations on Selected Plant Species The deposition velocity of NH3 on six plant species at environmental concentrations has been studied in a dynamic plant gas exchange reactor. The total resistance to the transport of NH3 was studied. The aerodynamic resistance was determined directly by NH3 gas absorption in aqueous solutions at environmental concentrations in a two-phase gradientless reactor modeling the transfer processes through the stomata in a leaf. The concentration of NH3 in the gas phase ranged from 50 to 1000 ppb and the temperature varied from 25 to 30°C. The results for the deposition velocity for NH3, during the day, varied from 0.3 to 1.3 cm/s. The deposition velocities at night were about one order of magnitude smaller. These results are compared with estimates from the Frdssling equation which consistently yields higher values of the same order of magnitude. To determine accurate atmospheric transport models or global budget models, a variable deposition velocity should be used to account for the diurnal and seasonal variations in the surface resistance. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of the Air Pollution Control Association Taylor & Francis

Dry Deposition of Ammonia at Environmental Concentrations on Selected Plant Species

Dry Deposition of Ammonia at Environmental Concentrations on Selected Plant Species

Journal of the Air Pollution Control Association , Volume 36 (12): 4 – Dec 1, 1986

Abstract

The deposition velocity of NH3 on six plant species at environmental concentrations has been studied in a dynamic plant gas exchange reactor. The total resistance to the transport of NH3 was studied. The aerodynamic resistance was determined directly by NH3 gas absorption in aqueous solutions at environmental concentrations in a two-phase gradientless reactor modeling the transfer processes through the stomata in a leaf. The concentration of NH3 in the gas phase ranged from 50 to 1000 ppb and the temperature varied from 25 to 30°C. The results for the deposition velocity for NH3, during the day, varied from 0.3 to 1.3 cm/s. The deposition velocities at night were about one order of magnitude smaller. These results are compared with estimates from the Frdssling equation which consistently yields higher values of the same order of magnitude. To determine accurate atmospheric transport models or global budget models, a variable deposition velocity should be used to account for the diurnal and seasonal variations in the surface resistance.

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References (18)

Publisher
Taylor & Francis
Copyright
Copyright 1986 Air & Waste Management Association
ISSN
0002-2470
DOI
10.1080/00022470.1986.10466183
Publisher site
See Article on Publisher Site

Abstract

The deposition velocity of NH3 on six plant species at environmental concentrations has been studied in a dynamic plant gas exchange reactor. The total resistance to the transport of NH3 was studied. The aerodynamic resistance was determined directly by NH3 gas absorption in aqueous solutions at environmental concentrations in a two-phase gradientless reactor modeling the transfer processes through the stomata in a leaf. The concentration of NH3 in the gas phase ranged from 50 to 1000 ppb and the temperature varied from 25 to 30°C. The results for the deposition velocity for NH3, during the day, varied from 0.3 to 1.3 cm/s. The deposition velocities at night were about one order of magnitude smaller. These results are compared with estimates from the Frdssling equation which consistently yields higher values of the same order of magnitude. To determine accurate atmospheric transport models or global budget models, a variable deposition velocity should be used to account for the diurnal and seasonal variations in the surface resistance.

Journal

Journal of the Air Pollution Control AssociationTaylor & Francis

Published: Dec 1, 1986

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