Modeling the surface-atmosphere exchange of ammonia

Wichink Kruit, R.J.; van Pul, W.A.J.; Sauter, F.J.; van den Broek, M.; Nemitz, E.; Sutton, M.A.; Krol, M.; Holtslag, A.A.M.. 2010 Modeling the surface-atmosphere exchange of ammonia. Atmospheric Environment, 44 (7). 945-957. 10.1016/j.atmosenv.2009.11.049

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New parameterizations for surface–atmosphere exchange of ammonia are presented for application in atmospheric transport models and compared with parameterizations of the literature. The new parameterizations are based on a combination of the results of three years of ammonia flux measurements over a grassland canopy (dominated by Lolium perenne and Poa trivialis) near Wageningen, the Netherlands and existing parameterizations from literature. First, a model for the surface–atmosphere exchange of ammonia that includes the concentration at the external leaf surface is derived and validated. Second, a parameterization for the stomatal compensation point (expressed as Γs, the ratio of [NH4+]/[H+] in the leaf apoplast) that accounts for the observed seasonal variation is derived from the measurements. The new, temperature-dependent Γs describes the observed seasonal behavior very well. It is noted, however, that senescence of plants and field management practices will also influence the seasonal variation of Γs on a shorter timescale. Finally, a relation that links Γs to the atmospheric pollution level of the location through the ‘long-term’ NH3 concentration in the air is proposed.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1016/j.atmosenv.2009.11.049
Programmes: CEH Topics & Objectives 2009 - 2012 > Biogeochemistry > BGC Topic 2 - Biogeochemistry and Climate System Processes > BGC - 2.1 - Quantify & model processes that control the emission, fate and bioavailability of pollutants
CEH Topics & Objectives 2009 - 2012 > Biogeochemistry > BGC Topic 1 - Monitoring and Interpretation of Biogeochemical and Climate Changes > BGC - 1.1 - Monitor concentrations, fluxes, physico-chemical forms of current and emerging pollutants ...
CEH Sections: Billett (to November 2013)
ISSN: 1352-2310
Additional Keywords: ammonia, dry deposition, compensation point, resistance analogue, atmospheric transport model
NORA Subject Terms: Atmospheric Sciences
Date made live: 27 Apr 2010 13:20

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