CO2
profiles were simulated in the atmospheric boundary layer above sloping terrain
using a three dimensional transport model coupled with a vegetation sub-model.
WMO/GAW concentration monitoring site and ecosystem flux measurement site were
located inside the modeled region at the top of a hill and at boreal forest,
respectively. According to model results, the concentration measurement at hill
site was representative for continental background. However, concentration at few
meters above active vegetation represented mainly local variation.
Concentration difference between hill site and forest site was about 5 ppm
during afternoon according to both model and measurements. The hill site was
above boundary layer during night and inside boundary layer during daytime. The
regional CO2 signal dominated in both cases. The average flux to the
whole model region was about 40 % of the local flux at the forest site.
Author: T. Aalto, J. Hatakka, M. Aurela, T. Thum and A. Lohila (tuula dot aalto at fmi dot fi)
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