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Evaluation of the stomatal conductance formulation in the EMEP ozone deposition model for Picea Abies

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JournalAtmospheric Environment
DatePublished - May 2004
Issue number15
Volume38
Number of pages9
Pages (from-to)2339-2348
Original languageEnglish

Abstract

It is widely acknowledged that the possible impacts of ozone on forest trees are more closely related to ozone flux through the stomata than to external ozone exposure. However, the application of the flux approach on a European scale requires the availability of appropriate models, such as the European Monitoring and Evaluation Programme (EMEP) ozone deposition model, for estimating ozone flux and cumulative ozone uptake. Within this model stomatal conductance is the key variable, since it determines the amount of ozone absorbed by the leaves. This paper describes the suitability of the existing EMEP ozone deposition model parameterisation and formulation to represent stomatal behaviour determined from field measurements on adult Norway spruce (Picea abies (L.) Karst.) trees in the Central European Alps. Parameters affecting maximum stomatal conductance (e.g. seasonal phenology, needle position, needle age, nutrient deficiency and ozone itself) and stomatal response functions to temperature, irradiance, vapour pressure deficit, and soil water content are investigated. Finally, current limitations and possible alterations of the EMEP model will be discussed with respect to spatial scales of available input data for future flux modelling. (C) 2004 Elsevier Ltd. All rights reserved.

    Research areas

  • ozone uptake, EMEP O-3 deposition model, stomata, season, temperature, irradiance, water vapour pressure deficit, OPEN-TOP CHAMBERS, LONG-TERM EXPOSURE, GAS-EXCHANGE RESPONSE, CURRENT-YEAR NEEDLES, NORWAY SPRUCE, L KARST, NONSTOMATAL LIMITATION, NET PHOTOSYNTHESIS, LEAF CONDUCTANCE, DIFFERENT AGES

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