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| Titel |
Modeling atmospheric CO2 concentration profiles and fluxes above sloping terrain at a boreal site |
| VerfasserIn |
T. Aalto, J. Hatakka, U. Karstens, M. Aurela, T. Thum, A. Lohila |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 6, no. 2 ; Nr. 6, no. 2 (2006-02-03), S.303-314 |
| Datensatznummer |
250003409
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| Publikation (Nr.) |
 copernicus.org/acp-6-303-2006.pdf |
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| Zusammenfassung |
| CO2 fluxes and concentrations were simulated in the planetary boundary
layer above subarctic hilly terrain using a three dimensional model. The
model solves the transport equations in the local scale and includes a
vegetation sub-model. A WMO/GAW background concentration measurement site
and an ecosystem flux measurement site are located inside the modeled region
at a hilltop and above a mixed boreal forest, respectively. According to
model results, the concentration measurement at the hill site was
representative for continental background. However, this was not the case
for the whole model domain. Concentration at few meters above active
vegetation represented mainly local variation. Local variation became
inseparable from the regional signal at about 60-100 m above ground. Flow
over hills changed profiles of environmental variables and height of
inversion layer, however CO2 profiles were more affected by upwind land
use than topography. The hill site was above boundary layer during night and
inside boundary layer during daytime. The CO2 input from model lateral
boundaries dominated in both cases. Daily variation in the CO2
assimilation rate was clearly seen in the CO2 profiles. Concentration
difference between the hill site and the forest site was about 5ppm during
afternoon according to both model and measurements. The average modeled flux
to the whole model region was about 40% of measured and modeled local
flux at the forest site. |
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