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  Global soil-biogenic NOx emissions and the role of canopy processes

Ganzeveld, L. N., Lelieveld, J., Dentener, F. J., Krol, M. C., Bouwman, A. J., & Roelofs, G. J. (2002). Global soil-biogenic NOx emissions and the role of canopy processes. Journal of Geophysical Research, 107(D16): 4298. doi:10.1029/2001JD001289.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0014-90C2-0 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0014-90C3-E
Genre: Journal Article
Alternative Title : J. Geophys. Res.

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 Creators:
Ganzeveld, L. N.1, Author              
Lelieveld, J.1, Author              
Dentener, F. J., Author
Krol, M. C., Author
Bouwman, A. J., Author
Roelofs, G. J., Author
Affiliations:
1Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826285              

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Free keywords: atmosphere-biosphere exchanges; oxidized nitrogen; dry deposition; biogenic emissions; canopy reduction factor; global-scale modeling
 Abstract: [1] Soils are an important though uncertain source of oxidized nitrogen (NOx)to the atmosphere. One of the main uncertainties in the source estimates is the role of the canopy interactions between NOx emissions, dry deposition, turbulence, and chemistry. Previous studies, in which only dry deposition has been considered, indicate a reduction of about 50% of the globally emitted NOx by soils. We have implemented a multilayer trace gas exchange model in a chemistry general circulation model to explicitly calculate the role of canopy interactions in regulating the effective NOx emissions to the atmosphere. Our new NOx emission algorithm interactively calculates a global soil emission flux of about 12 Tg N yr(-1). For a sensitivity analysis we have also included a fixed global soil NOx emissions inventory of about 21 Tg N yr(-1). It appears that the enhancement of NOx and O-3 concentrations in response to the soil emission flux is suppressed by the compensating effect of dry deposition. For sites that are exposed to relatively large emission fluxes, our multilayer and the previously used big leaf approach, which does not consider canopy interactions, calculate similar surface NOx fluxes. This confirms the validity of the big leaf approach for most polluted regions at midlatitudes. However, for relatively pristine sites in the subtropics and tropics, where NOx is a limiting factor in ozone and hydroxyl chemistry, there are distinct differences between the multilayer and big leaf NOx surface fluxes. This justifies the use of more comprehensive atmosphere-biosphere exchange descriptions in global models.

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Language(s): eng - English
 Dates: 2002-08-27
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 18178
ISI: 000180327900004
DOI: 10.1029/2001JD001289
 Degree: -

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Title: Journal of Geophysical Research
  Alternative Title : J. Geophys. Res.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 107 (D16) Sequence Number: 4298 Start / End Page: - Identifier: ISSN: 0747-7309