Modeling the dynamic chemical interactions of atmospheric ammonia and other trace gases with measured leaf surface wetness in a managed grassland canopy

Burkhardt, J.; Flechard, C.R.; Gresens, F.; Mattsson, M.E.; Jongejan, P.A.C.; Erisman, J.W.; Weidinger, T.; Mészáros, R.; Nemitz, E.; Sutton, M.A.. 2008 Modeling the dynamic chemical interactions of atmospheric ammonia and other trace gases with measured leaf surface wetness in a managed grassland canopy. Biogeosciences Discussions, 5. 2505-2539. 10.5194/bgd-5-2505-2008

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Abstract/Summary

Ammonia exchange fluxes between grassland and the atmosphere were modeled on the basis of stomatal compensation points and leaf surface chemistry, and compared with measured fluxes during the GRAMINAE intensive measurement campaign in spring 2000 near Braunschweig, Germany. Leaf wetness and dew chemistry in grassland were measured together with ammonia fluxes and apoplastic NH4+ and H+ concentration, and the data were used to apply, validate and further develop an existing model of leaf surface chemistry and ammonia exchange. The leaf surface water storage was calculated from measured leaf wetness data using an exponential parameterisation. The measurement period was divided into three phases: a relatively wet phase followed by a dry phase in the first week before the grass was cut, and a second drier week after the cut. While the first two phases were mainly characterised by ammonia deposition and occasional short emission events, regular events of strong ammonia emissions were observed during the post-cut period. A single-layer resistance model including dynamic cuticular and stomatal exchange could describe the fluxes well before and after the cut, but unrealistically high stomatal compensation points were needed after the cut in order to match measured fluxes. Significant improvements were obtained when a second layer was introduced into the model, to account for the large additional ammonia source inherent in the leaf litter at the bottom of the grass canopy.

Item Type:	Article
Identification Number/DOI:	10.5194/bgd-5-2505-2008
Programmes:	CEH Programmes pre-2009 publications > Biogeochemistry
CEH Sections:	Billett
Additional Information:	Full text access available via the Official URL link. Open access journal.
NORA Subject Terms:	Atmospheric Sciences
Date made live:	17 May 2010 15:19
URI:	http://nora.nerc.ac.uk/id/eprint/9465

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