Quantifying dry NH3 deposition to an ombrotrophic bog from an automated NH3 field release system

Leith, Ian; Sheppard, Lucy; Fowler, David; Cape, Neil; Jones, Matthew; Crossley, Alan; Hargreaves, Ken J; Tang, Yuk; Theobald, Mark; Sutton, Mark. 2004 Quantifying dry NH3 deposition to an ombrotrophic bog from an automated NH3 field release system. Water, Air and Soil Pollution: Focus, 4 (6). 207-218.

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Providing an accurate estimate of the dry component of N deposition to low N background, semi-natural habitats, such as bogs and upland moors dominated by Calluna vulgaris is difficult, but essential to relate nitrogen deposition to effects in these communities. To quantify the effects of NH3 inputs to moorland vegetation growing on a bog at a field scale, a field release NH3 fumigation system was established at Whim Moss (Scottish Borders) in 2002. Gaseous NH3 from a line source was released along of a 60 m transect, when meteorological conditions (wind speed >2.5 m s-1 and wind direction in the sector 180–215°) were met, thereby providing a profile of decreasing NH3 concentration with distance from the source. In a complementary study, using a NH3 flux chamber system, the relationships between NH3 concentrations and cuticular resistances were quantified for a range of NH3 concentrations and micrometeorological conditions for moorland vegetation. Cuticular resistances increased with NH3 concentration from 11 s m-1 at 3.0 g m-3 to 30 s m-1 at 30 g m-3. The NH3 concentration data and the concentration-dependent canopy resistance are used to calculate NH3 deposition taking into account leaf surface wetness. The implications of using an NH3 concentration-dependent cuticular resistance and the importance for refining critical loads are discussed

Item Type: Publication - Article
Digital Object Identifier (DOI):
Programmes: CEH Programmes pre-2009 publications > Biogeochemistry > BG02 Recovery from acidification and eutrophication
UKCEH and CEH Sections/Science Areas: Billett (to November 2013)
ISSN: 0049-6979
Additional Keywords: ammonia, bog, concentration, cuticular resistance, field release, nitrogen, wet and dry deposition
NORA Subject Terms: Meteorology and Climatology
Ecology and Environment
Earth Sciences
Atmospheric Sciences
Date made live: 20 May 2009 08:42 +0 (UTC)

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