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Estimate of annual NH3 dry deposition to a fumigated ombrotrophic bog using concentration-dependent deposition velocities

Cape, J. N.; Jones, M. R.; Leith, I. D.; Sheppard, L. J.; van Dijk, N.; Sutton, M. A.; Fowler, D.. 2008 Estimate of annual NH3 dry deposition to a fumigated ombrotrophic bog using concentration-dependent deposition velocities. Atmospheric Environment, 42 (27). 6637-6646. 10.1016/j.atmosenv.2008.04.027

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Abstract/Summary

Estimates of the dry deposition of ammonia (NH3) gas in a field fumigation experiment on an ombrotrophic bog have been made using the inferential technique, with measured wind speed at 2 m, and air concentrations at two heights above the vegetation. The parameters for a concentration-dependent surface resistance term have been derived from flux measurements over the same vegetation in a chamber study, separating stomatal from non-stomatal resistances. Annual NH3-N deposition in each of the 4 years 2003-2006 was estimated to increase from 3.0 ± 0.2 kg N ha-1y-1 in ambient air, with an NH3 concentration at 0.5 m above the canopy of 0.7 μg m-3, to 50-70 kg N ha-1y-1 where annual average air concentrations were 70-90 μg m-3 and concentrations during fumigation were up to 1600 μg m-3. The equivalent deposition velocities (at z=0.5 m) were 0.016 m s-1 in ambient air and 0.003 m s-1 at 100 μg m-3. The differences between annual deposition estimates made from independent air concentration data at 0.1 m and 0.5 m above the canopy were small for distances more than 10 m from the source, after vertical mixing was complete. Over 4 years (2003 to 2006) and at 8 sampling points more than 10 m from the NH3 source, the mean difference between the dry deposition estimates, using NH3 concentrations measured independently at 0.1 m and 0.5 m above the canopy, was 2%. Use of a constant surface resistance, with no concentration dependence, as commonly used in inferential models of dry deposition, would have predicted deposition up to 8 times too large.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1016/j.atmosenv.2008.04.027
Programmes: CEH Programmes pre-2009 publications > Biogeochemistry > BG01 Measuring and modelling trace gas, aerosol and carbon > BG01.1 UK nitrogen and sulphur compounds
CEH Programmes pre-2009 publications > Biogeochemistry > BG02 Recovery from acidification and eutrophication
CEH Sections: Billett
ISSN: 1352-2310
Additional Information. Not used in RCUK Gateway to Research.: The definitive version of this document is available at www.elsevier.com
Additional Keywords: surface resistance, dry deposition, ammonia, field release, point source
NORA Subject Terms: Agriculture and Soil Science
Ecology and Environment
Atmospheric Sciences
Date made live: 22 Oct 2008 12:42
URI: http://nora.nerc.ac.uk/id/eprint/4001

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