Atmos. Chem. Phys. Discuss., 10, 21721-21790, 2010
www.atmos-chem-phys-discuss.net/10/21721/2010/
doi:10.5194/acpd-10-21721-2010
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
The Chemistry of Atmosphere-Forest Exchange (CAFE) Model – Part 1: Model description and characterization
G. M. Wolfe1,2 and J. A. Thornton2
1Department of Chemistry, University of Washington, Seattle, WA, USA
2Department of Atmospheric Sciences, University of Washington, Seattle, WA, USA

Abstract. We present the Chemistry of Atmosphere-Forest Exchange (CAFE) model, a vertically-resolved 1-D chemical transport model designed to probe the details of near-surface reactive gas exchange. CAFE integrates all key processes, including turbulent diffusion, emission, deposition and chemistry, throughout the forest canopy and mixed layer. It is the first model of its kind to incorporate the Master Chemical Mechanism (MCM) and a suite of reactions for the oxidation of monoterpenes and sesquiterpenes, providing a more comprehensive description of the oxidative chemistry occurring within and above the forest. We use CAFE to simulate a young Ponderosa pine forest in the Sierra Nevada, CA. Utilizing meteorological constraints from the BEARPEX-2007 field campaign, we assess the sensitivity of modeled fluxes to parameterizations of diffusion, laminar sublayer resistance and radiation extinction. To characterize the general chemical environment of this forest, we also present modeled mixing ratio profiles of biogenic hydrocarbons, hydrogen oxides and reactive nitrogen. The vertical profiles of these species demonstrate a range of structures and gradients that reflect the interplay of physical and chemical processes within the forest canopy, which can influence net exchange.

Citation: Wolfe, G. M. and Thornton, J. A.: The Chemistry of Atmosphere-Forest Exchange (CAFE) Model – Part 1: Model description and characterization, Atmos. Chem. Phys. Discuss., 10, 21721-21790, doi:10.5194/acpd-10-21721-2010, 2010.
 
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