Controls on methane released through ebullition in peatlands affected by permafrost degradation
Permafrost thaw in peat plateaus leads to the flooding of surface soils and the formation of collapse scar bogs, which have the potential to be large emitters of methane (CH4) from surface peat as well as deeper, previously frozen, permafrost carbon (C). We used a network of bubble traps, permanentl...
Main Authors: | , , , , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
eScholarship, University of California
2014
|
Subjects: | |
Online Access: | https://escholarship.org/uc/item/7pk481z7 |
id |
ftcdlib:oai:escholarship.org/ark:/13030/qt7pk481z7 |
---|---|
record_format |
openpolar |
spelling |
ftcdlib:oai:escholarship.org/ark:/13030/qt7pk481z7 2023-05-15T16:37:05+02:00 Controls on methane released through ebullition in peatlands affected by permafrost degradation Klapstein, SJ Turetsky, MR McGuire, AD Harden, JW Czimczik, CI Xu, X Chanton, JP Waddington, JM 418 - 431 2014-01-01 application/pdf https://escholarship.org/uc/item/7pk481z7 unknown eScholarship, University of California qt7pk481z7 https://escholarship.org/uc/item/7pk481z7 CC-BY CC-BY Journal of Geophysical Research: Biogeosciences, vol 119, iss 3 CH4 bubbles thermokarst carbon radiocarbon collapse scar Geophysics article 2014 ftcdlib 2021-06-20T14:23:05Z Permafrost thaw in peat plateaus leads to the flooding of surface soils and the formation of collapse scar bogs, which have the potential to be large emitters of methane (CH4) from surface peat as well as deeper, previously frozen, permafrost carbon (C). We used a network of bubble traps, permanently installed 20cm and 60cm beneath the moss surface, to examine controls on ebullition from three collapse bogs in interior Alaska. Overall, ebullition was dominated by episodic events that were associated with changes in atmospheric pressure, and ebullition was mainly a surface process regulated by both seasonal ice dynamics and plant phenology. The majority (>90%) of ebullition occurred in surface peat layers, with little bubble production in deeper peat. During periods of peak plant biomass, bubbles contained acetate-derived CH4 dominated (>90%) by modern C fixed from the atmosphere following permafrost thaw. Post-senescence, the contribution of CH4 derived from thawing permafrost C was more variable and accounted for up to 22% (on average 7%), in the most recently thawed site. Thus, the formation of thermokarst features resulting from permafrost thaw in peatlands stimulates ebullition and CH4 release both by creating flooded surface conditions conducive to CH4 production and bubbling as well as by exposing thawing permafrost C to mineralization. ©2014. American Geophysical Union. All Rights Reserved. Article in Journal/Newspaper Ice Peat permafrost Thermokarst Alaska University of California: eScholarship |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
CH4 bubbles thermokarst carbon radiocarbon collapse scar Geophysics |
spellingShingle |
CH4 bubbles thermokarst carbon radiocarbon collapse scar Geophysics Klapstein, SJ Turetsky, MR McGuire, AD Harden, JW Czimczik, CI Xu, X Chanton, JP Waddington, JM Controls on methane released through ebullition in peatlands affected by permafrost degradation |
topic_facet |
CH4 bubbles thermokarst carbon radiocarbon collapse scar Geophysics |
description |
Permafrost thaw in peat plateaus leads to the flooding of surface soils and the formation of collapse scar bogs, which have the potential to be large emitters of methane (CH4) from surface peat as well as deeper, previously frozen, permafrost carbon (C). We used a network of bubble traps, permanently installed 20cm and 60cm beneath the moss surface, to examine controls on ebullition from three collapse bogs in interior Alaska. Overall, ebullition was dominated by episodic events that were associated with changes in atmospheric pressure, and ebullition was mainly a surface process regulated by both seasonal ice dynamics and plant phenology. The majority (>90%) of ebullition occurred in surface peat layers, with little bubble production in deeper peat. During periods of peak plant biomass, bubbles contained acetate-derived CH4 dominated (>90%) by modern C fixed from the atmosphere following permafrost thaw. Post-senescence, the contribution of CH4 derived from thawing permafrost C was more variable and accounted for up to 22% (on average 7%), in the most recently thawed site. Thus, the formation of thermokarst features resulting from permafrost thaw in peatlands stimulates ebullition and CH4 release both by creating flooded surface conditions conducive to CH4 production and bubbling as well as by exposing thawing permafrost C to mineralization. ©2014. American Geophysical Union. All Rights Reserved. |
format |
Article in Journal/Newspaper |
author |
Klapstein, SJ Turetsky, MR McGuire, AD Harden, JW Czimczik, CI Xu, X Chanton, JP Waddington, JM |
author_facet |
Klapstein, SJ Turetsky, MR McGuire, AD Harden, JW Czimczik, CI Xu, X Chanton, JP Waddington, JM |
author_sort |
Klapstein, SJ |
title |
Controls on methane released through ebullition in peatlands affected by permafrost degradation |
title_short |
Controls on methane released through ebullition in peatlands affected by permafrost degradation |
title_full |
Controls on methane released through ebullition in peatlands affected by permafrost degradation |
title_fullStr |
Controls on methane released through ebullition in peatlands affected by permafrost degradation |
title_full_unstemmed |
Controls on methane released through ebullition in peatlands affected by permafrost degradation |
title_sort |
controls on methane released through ebullition in peatlands affected by permafrost degradation |
publisher |
eScholarship, University of California |
publishDate |
2014 |
url |
https://escholarship.org/uc/item/7pk481z7 |
op_coverage |
418 - 431 |
genre |
Ice Peat permafrost Thermokarst Alaska |
genre_facet |
Ice Peat permafrost Thermokarst Alaska |
op_source |
Journal of Geophysical Research: Biogeosciences, vol 119, iss 3 |
op_relation |
qt7pk481z7 https://escholarship.org/uc/item/7pk481z7 |
op_rights |
CC-BY |
op_rightsnorm |
CC-BY |
_version_ |
1766027385418809344 |