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| Titel |
Soil moisture control over autumn season methane flux, Arctic Coastal Plain of Alaska |
| VerfasserIn |
C. S. Sturtevant, W. C. Oechel, D. Zona, Y. Kim, C. E. Emerson |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 9, no. 4 ; Nr. 9, no. 4 (2012-04-17), S.1423-1440 |
| Datensatznummer |
250006951
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| Publikation (Nr.) |
 copernicus.org/bg-9-1423-2012.pdf |
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| Zusammenfassung |
| Accurate estimates of annual budgets of methane (CH4) efflux in arctic
regions are severely constrained by the paucity of non-summer measurements.
Moreover, the incomplete understanding of the ecosystem-level sensitivity of
CH4 emissions to changes in tundra moisture makes prediction of future
CH4 release from the Arctic extremely difficult. This study addresses
some of these research gaps by presenting an analysis of eddy covariance and
chamber measurements of CH4 efflux and supporting environmental
variables during the autumn season and associated beginning of soil
freeze-up at our large-scale water manipulation site near Barrow, Alaska
(the Biocomplexity Experiment). We found that the autumn season CH4
emission is significant (accounting for 21–25% of the average growing
season emission), and that this emission is mostly controlled by the
fraction of inundated landscape, atmospheric turbulence, and the decline in
unfrozen water during the period of soil freezing. Drainage decreased autumn
CH4 emission by a factor of 2.4 compared to our flooded treatment.
Flooding slowed the soil freezing process which has implications for
extending elevated CH4 emissions longer into the winter season. |
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