Modeling atmospheric CO<sub>2</sub> concentration profiles and fluxes above sloping terrain at a boreal site
CO<sub>2</sub> 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 measu...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2006-01-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | http://www.atmos-chem-phys.net/6/303/2006/acp-6-303-2006.pdf |
| _version_ | 1811316731701886976 |
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| author | T. Aalto J. Hatakka U. Karstens M. Aurela T. Thum A. Lohila |
| author_facet | T. Aalto J. Hatakka U. Karstens M. Aurela T. Thum A. Lohila |
| author_sort | T. Aalto |
| collection | DOAJ |
| description | CO<sub>2</sub> 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 CO<sub>2</sub> 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 CO<sub>2</sub> input from model lateral boundaries dominated in both cases. Daily variation in the CO<sub>2</sub> assimilation rate was clearly seen in the CO<sub>2</sub> 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. |
| first_indexed | 2024-04-13T11:54:41Z |
| format | Article |
| id | doaj.art-21bb747395bf44fca57864d53d83fce4 |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-04-13T11:54:41Z |
| publishDate | 2006-01-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-21bb747395bf44fca57864d53d83fce42022-12-22T02:47:56ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242006-01-0162303314Modeling atmospheric CO<sub>2</sub> concentration profiles and fluxes above sloping terrain at a boreal siteT. AaltoJ. HatakkaU. KarstensM. AurelaT. ThumA. LohilaCO<sub>2</sub> 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 CO<sub>2</sub> 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 CO<sub>2</sub> input from model lateral boundaries dominated in both cases. Daily variation in the CO<sub>2</sub> assimilation rate was clearly seen in the CO<sub>2</sub> 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.http://www.atmos-chem-phys.net/6/303/2006/acp-6-303-2006.pdf |
| spellingShingle | T. Aalto J. Hatakka U. Karstens M. Aurela T. Thum A. Lohila Modeling atmospheric CO<sub>2</sub> concentration profiles and fluxes above sloping terrain at a boreal site Atmospheric Chemistry and Physics |
| title | Modeling atmospheric CO<sub>2</sub> concentration profiles and fluxes above sloping terrain at a boreal site |
| title_full | Modeling atmospheric CO<sub>2</sub> concentration profiles and fluxes above sloping terrain at a boreal site |
| title_fullStr | Modeling atmospheric CO<sub>2</sub> concentration profiles and fluxes above sloping terrain at a boreal site |
| title_full_unstemmed | Modeling atmospheric CO<sub>2</sub> concentration profiles and fluxes above sloping terrain at a boreal site |
| title_short | Modeling atmospheric CO<sub>2</sub> concentration profiles and fluxes above sloping terrain at a boreal site |
| title_sort | modeling atmospheric co sub 2 sub concentration profiles and fluxes above sloping terrain at a boreal site |
| url | http://www.atmos-chem-phys.net/6/303/2006/acp-6-303-2006.pdf |
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