Testing of models of stomatal ozone fluxes with field measurements in a mixed Mediterranean forest

TitoloTesting of models of stomatal ozone fluxes with field measurements in a mixed Mediterranean forest
Tipo di pubblicazioneArticolo su Rivista peer-reviewed
Anno di Pubblicazione2013
AutoriFares, S., Matteucci G., G. Mugnozza Scarascia, Morani A., Calfapietra C., Salvatori E., Fusaro L., Manes F., and Loreto F.
RivistaAtmospheric Environment
Parole chiavearticle, atmosphere, atmosphere-biosphere interaction, Atmospheric chemistry, atmospheric deposition, atmospheric modeling, atmospheric plume, biosphere, canopy, Canopy level, Castelporziano, chemistry, Cities, coniferous tree, controlled study, correlation, Correlation analysis, deciduous tree, Deposition, Eddy covariance, Eddy covariance technique, Environmental parameter, Environmental parameters, Field campaign, Field measurement, field study, forest, forest ecosystem, forestry, Forests, Fruits, Gasphase, GPP, humidity, Italy, Lazio, Mediterranean, Mediterranean environment, Mediterranean forest, Mediterranean Sea, mixed forest, model test, Model-based OPC, net primary production, nonhuman, oak, Ozone, Ozone flux, Ozone layer, Parameters, pine, Pinus pinea, plant stoma, priority journal, Quercus, Quercus ilex, Quercus suber, relative humidity, Risk assessment, Roma [Lazio], Southern Europe, Stomatal conductance, Total ozone, troposphere, Tropospheric ozone, Urban areas, Vegetation

Mediterranean forests close to urban areas are exposed to polluted plumes loaded with tropospheric ozone. This is the case of Castelporziano Estate, a 6000 ha Mediterranean forest 25 km from Rome downtown on the coast of the Mediterranean Sea. In September 2011 we started an intensive field campaign aimed at investigating ozone deposition from a mixed Mediterranean forest, mainly composed by Quercus suber, Quercus ilex, Pinus pinea. Measurements at canopy level with the eddy covariance technique were supported by a vegetation survey and the measurement of all environmental parameters which allowed to calculate stomatal ozone fluxes. Leaf-level measurements were used to parameterize models to calculate stomatal conductance based on a Jarvis-type and Ball-Berry approach. We show changes in magnitude of ozone fluxes from a warm (September) to a cold period (October-December). Stomatal component explained almost the totality of ozone fluxes during the cold days, but contributed only up to 50% to total ozone deposition during warm days, suggesting that other sinks (e.g. chemistry in the gas-phase) play a major role. Modeled stomatal ozone fluxes based on a Jarvis-type approach (DO3SE) correlated with measured fluxes better than using a Ball-Berry approach. A third model based on a modified Ball-Berry equation was proposed to account for the non-linear dependency of stomatal conductance on relative humidity. This research will help the development of metrics for ozone-risk assessment and advance our understanding of mixed Mediterranean forests in biosphere-atmosphere exchange. © 2012 Elsevier Ltd.


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