Ammonia deposition near hot spots: processes, models and monitoring methods

Loubet, Benjamin; Asman, Willem A. H.; Theobald, Mark; Hertel, Ole; Tang, Sim Y.; Robin, Paul; Hassouna, Melynda; Dammgen, Ulrich; Genermont, Sophie; Cellier, Pierre; Sutton, Mark A ORCID: 2006 Ammonia deposition near hot spots: processes, models and monitoring methods. [Other] In: UNECE Expert Workshop on Ammonia, Edinburgh, 4-6 December 2006. United Nations Economic Commission for Europe.

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Atmospheric reduced nitrogen (NHx) mainly originates from hot spots, which can be considered as intensive area or point sources. A large fraction of the emitted NHx may be recaptured by the surrounding vegetation, hence reducing the contribution of these hot spots to long-range transport of NHx. This paper reviews the processes leading to local recapture of NHx near hot spots as well as existing models and monitoring methods. The existing models range from research models to more operational models that can be coupled with long-range transport model provided the necessary information on emissions is available. Local recapture of NH3 ranges from 2% to 60% within 2 km of a hot-spot and it is sensitive to source height, atmospheric stability, wind speed, structure of the surrounding canopies, as well as stomatal absorption, which mainly depends on green leaf area index and stomatal NH3 compensation point of vegetation, and finally, cuticular deposition, which depends primarily on vegetation wetness. The main uncertainties and limitations on NHx recapture models and monitoring techniques are discussed.

Item Type: Publication - Conference Item (Other)
Programmes: CEH Programmes pre-2009 publications > Biogeochemistry
UKCEH and CEH Sections/Science Areas: _ Atmospheric Sciences
Additional Information. Not used in RCUK Gateway to Research.: Background Document for Working Group 3
Additional Keywords: NH3, ammonia, NH4+, ammonium, reduced nitrogen, local scale, dispersion, trans-boundary pollution
NORA Subject Terms: Ecology and Environment
Atmospheric Sciences
Date made live: 04 Oct 2007 11:33 +0 (UTC)

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