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. ORCID: https://orcid.org/0000-0002-6263-6341; 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. https://doi.org/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 |
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Digital Object Identifier (DOI): | https://doi.org/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 |
UKCEH and CEH Sections/Science Areas: | Billett (to November 2013) |
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 +0 (UTC) |
URI: | https://nora.nerc.ac.uk/id/eprint/4001 |
Available Versions of this Item
- Estimate of annual NH3 dry deposition to a fumigated ombrotrophic bog using concentration-dependent deposition velocities. (deposited 22 Oct 2008 12:42) [Currently Displayed]
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