Soil moisture control over autumn season methane flux, arctic coastal plain of Alaska
Abstract: 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 fu...
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Language: | English |
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Online Access: | https://hdl.handle.net/10067/1022300151162165141 https://repository.uantwerpen.be/docman/irua/23ac5f/10336.pdf |
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ftunivantwerpen:c:irua:102230 2024-10-06T13:46:01+00:00 Soil moisture control over autumn season methane flux, arctic coastal plain of Alaska Sturtevant, C.S. Oechel, W.C. Zona, Donatella Kim, Y. Emerson, C.E. 2012 pdf https://hdl.handle.net/10067/1022300151162165141 https://repository.uantwerpen.be/docman/irua/23ac5f/10336.pdf eng eng info:eu-repo/semantics/altIdentifier/isi/000304049800011 info:eu-repo/semantics/altIdentifier/doi/10.5194/BG-9-1423-2012 info:eu-repo/semantics/openAccess 1726-4170 Biogeosciences Physics Chemistry Biology info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2012 ftunivantwerpen https://doi.org/10.5194/BG-9-1423-2012 2024-09-10T04:06:33Z Abstract: 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. Article in Journal/Newspaper Arctic Barrow Tundra Alaska IRUA - Institutional Repository van de Universiteit Antwerpen Arctic Biogeosciences 9 4 1423 1440 |
institution |
Open Polar |
collection |
IRUA - Institutional Repository van de Universiteit Antwerpen |
op_collection_id |
ftunivantwerpen |
language |
English |
topic |
Physics Chemistry Biology |
spellingShingle |
Physics Chemistry Biology Sturtevant, C.S. Oechel, W.C. Zona, Donatella Kim, Y. Emerson, C.E. Soil moisture control over autumn season methane flux, arctic coastal plain of Alaska |
topic_facet |
Physics Chemistry Biology |
description |
Abstract: 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. |
format |
Article in Journal/Newspaper |
author |
Sturtevant, C.S. Oechel, W.C. Zona, Donatella Kim, Y. Emerson, C.E. |
author_facet |
Sturtevant, C.S. Oechel, W.C. Zona, Donatella Kim, Y. Emerson, C.E. |
author_sort |
Sturtevant, C.S. |
title |
Soil moisture control over autumn season methane flux, arctic coastal plain of Alaska |
title_short |
Soil moisture control over autumn season methane flux, arctic coastal plain of Alaska |
title_full |
Soil moisture control over autumn season methane flux, arctic coastal plain of Alaska |
title_fullStr |
Soil moisture control over autumn season methane flux, arctic coastal plain of Alaska |
title_full_unstemmed |
Soil moisture control over autumn season methane flux, arctic coastal plain of Alaska |
title_sort |
soil moisture control over autumn season methane flux, arctic coastal plain of alaska |
publishDate |
2012 |
url |
https://hdl.handle.net/10067/1022300151162165141 https://repository.uantwerpen.be/docman/irua/23ac5f/10336.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Barrow Tundra Alaska |
genre_facet |
Arctic Barrow Tundra Alaska |
op_source |
1726-4170 Biogeosciences |
op_relation |
info:eu-repo/semantics/altIdentifier/isi/000304049800011 info:eu-repo/semantics/altIdentifier/doi/10.5194/BG-9-1423-2012 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/BG-9-1423-2012 |
container_title |
Biogeosciences |
container_volume |
9 |
container_issue |
4 |
container_start_page |
1423 |
op_container_end_page |
1440 |
_version_ |
1812174370617950208 |