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| Titel |
Methane and carbon dioxide fluxes and their regional scalability for the European Arctic wetlands during the MAMM project in summer 2012 |
| VerfasserIn |
S. J. O'Shea, G. Allen, M. W. Gallagher, K. Bower, S. M. Illingworth, J. B. A. Muller, B. T. Jones, C. J. Percival, S. J.-B. Bauguitte, M. Cain, N. Warwick, A. Quiquet, U. Skiba, J. Drewer, K. Dinsmore, E. G. Nisbet, D. Lowry, R. E. Fisher, J. L. France, M. Aurela, A. Lohila, G. Hayman, C. George, D. B. Clark, A. J. Manning, A. D. Friend, J. Pyle |
| 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 ; 14, no. 23 ; Nr. 14, no. 23 (2014-12-10), S.13159-13174 |
| Datensatznummer |
250119230
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| Publikation (Nr.) |
 copernicus.org/acp-14-13159-2014.pdf |
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| Zusammenfassung |
| Airborne and ground-based measurements of methane (CH4), carbon dioxide
(CO2) and boundary layer thermodynamics were recorded over the
Fennoscandian landscape (67–69.5° N, 20–28° E) in
July 2012 as part of the MAMM (Methane and other greenhouse gases in the
Arctic: Measurements, process studies and Modelling) field campaign.
Employing these airborne measurements and a simple boundary layer box model,
net regional-scale (~ 100 km) fluxes were calculated to be
1.2 ± 0.5 mg CH4 h−1 m−2 and −350 ± 143 mg CO2 h−1 m−2. These airborne fluxes were found to be relatively
consistent with seasonally averaged surface chamber (1.3 ± 1.0 mg CH4 h−1 m−2) and eddy covariance
(1.3 ± 0.3 mg CH4 h−1 m−2 and
−309 ± 306 mg CO2 h−1 m−2) flux measurements in the local area. The internal consistency of
the aircraft-derived fluxes across a wide swath of Fennoscandia coupled with
an excellent statistical comparison with local seasonally averaged
ground-based measurements demonstrates the potential scalability of such
localised measurements to regional-scale representativeness. Comparisons were
also made to longer-term regional CH4 climatologies from the JULES
(Joint UK Land Environment Simulator) and HYBRID8 land surface models within
the area of the MAMM campaign. The average hourly emission flux output for
the summer period (July–August) for the year 2012 was 0.084 mg CH4 h−1 m−2 (minimum 0.0 and
maximum 0.21 mg CH4 h−1 m−2) for the JULES model and 0.088 mg CH4 h−1 m−2
(minimum 0.0008 and maximum 1.53 mg CH4 h−1 m−2) for
HYBRID8. Based on these observations both models were found to significantly
underestimate the CH4 emission flux in this region, which was linked to
the under-prediction of the wetland extents generated by the models. |
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