Atmospheric Chemistry and Physics, vol. 6, issue 5 (2006) pp. 1267-1274
Monoterpene fluxes have been measured over an 11 month period from June 2003 to April 2004. During all seasons ambient air temperature was the environmental factor most closely related to the measured emission rates. The monoterpene flux was modeled using a basal emission rate multiplied by an exponential function of a temperature, following the typical practice for modelling temperature dependent biogenic emissions. A basal emission of 1.0 mu mol h(-1) m(-2) (at 30 degrees C, based on leaf area) and a temperature dependence (beta) of 0.12 degrees C-1 reproduced measured summer emissions well but underestimated spring and winter measured emissions by 60-130%. The total annual monoterpene emission may be underestimated by similar to 50% when using a model optimized to reproduce monoterpene emissions in summer. The long term dataset also reveals an indirect connection between non-stomatal ozone and monoterpene flux beyond the dependence on temperature that has been shown for both fluxes.
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