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CO2 fluxes and concentrations were simulated in the planetary boundarylayer above subarctic hilly terrain using a three dimensional model. Themodel solves the transport equations in the local scale and includes avegetation sub-model. A WMO/GAW background concentration measurement siteand an ecosystem flux measurement site are located inside the modeled regionat a hilltop and above a mixed boreal forest, respectively. According tomodel results, the concentration measurement at the hill site wasrepresentative for continental background. However, this was not the casefor the whole model domain. Concentration at few meters above activevegetation represented mainly local variation. Local variation becameinseparable from the regional signal at about 60-100 m above ground. Flowover hills changed profiles of environmental variables and height ofinversion layer, however CO2 profiles were more affected by upwind landuse than topography. The hill site was above boundary layer during night andinside boundary layer during daytime. The CO2 input from model lateralboundaries dominated in both cases. Daily variation in the CO2assimilation rate was clearly seen in the CO2 profiles. Concentrationdifference between the hill site and the forest site was about 5ppm duringafternoon according to both model and measurements. The average modeled fluxto the whole model region was about 40% of measured and modeled localflux at the forest site

Modeling atmospheric CO&lt;sub&gt;2&lt;/sub&gt; concentration profiles and fluxes above sloping terrain at a boreal site

Modeling atmospheric CO<sub>2</sub> concentration profiles and fluxes above sloping terrain at a boreal site