Controls on Ebullition in Alaskan Peatlands Following Permafrost Degradation
Degradation of permafrost in peatlands can convert forested peat plateaus to inundated collapse bogs. Due to increased unfrozen soil carbon stocks and more saturated conditions, collapse bogs can potentially be large emitters of methane. Using a network of bubble traps permanently installed in peat,...
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2012
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ftcanadathes:oai:collectionscanada.gc.ca:OGU.10214/3861 2023-05-15T17:54:53+02:00 Controls on Ebullition in Alaskan Peatlands Following Permafrost Degradation Klapstein, Sara Jane Turetsky, Merritt R 2012-07-24 http://hdl.handle.net/10214/3861 en eng http://hdl.handle.net/10214/3861 Permafrost Carbon Methane Greenhouse gas flux Ebullition Thesis 2012 ftcanadathes 2013-11-23T23:01:28Z Degradation of permafrost in peatlands can convert forested peat plateaus to inundated collapse bogs. Due to increased unfrozen soil carbon stocks and more saturated conditions, collapse bogs can potentially be large emitters of methane. Using a network of bubble traps permanently installed in peat, I tested several hypotheses about controls on ebullition in collapse bogs with varying time since thaw in interior Alaska. Ebullition increased during the growing season, likely due to increased substrate availability and warmer soils. Bubbles were found primarily in shallow peat layers, and were dominated by modern carbon. Ebullition hot spots were associated with high sedge density throughout the collapse sites. Episodic ebullition occurred during atmospheric pressure changes. Overall, my study demonstrated that permafrost thaw in peatlands will result in methane emissions through ebullition that include both young and old carbon, contradictory to the generally accepted paradigm; that ebullition in peatlands is solely a surface process. Thesis Peat permafrost Alaska Theses Canada/Thèses Canada (Library and Archives Canada) |
institution |
Open Polar |
collection |
Theses Canada/Thèses Canada (Library and Archives Canada) |
op_collection_id |
ftcanadathes |
language |
English |
topic |
Permafrost Carbon Methane Greenhouse gas flux Ebullition |
spellingShingle |
Permafrost Carbon Methane Greenhouse gas flux Ebullition Klapstein, Sara Jane Controls on Ebullition in Alaskan Peatlands Following Permafrost Degradation |
topic_facet |
Permafrost Carbon Methane Greenhouse gas flux Ebullition |
description |
Degradation of permafrost in peatlands can convert forested peat plateaus to inundated collapse bogs. Due to increased unfrozen soil carbon stocks and more saturated conditions, collapse bogs can potentially be large emitters of methane. Using a network of bubble traps permanently installed in peat, I tested several hypotheses about controls on ebullition in collapse bogs with varying time since thaw in interior Alaska. Ebullition increased during the growing season, likely due to increased substrate availability and warmer soils. Bubbles were found primarily in shallow peat layers, and were dominated by modern carbon. Ebullition hot spots were associated with high sedge density throughout the collapse sites. Episodic ebullition occurred during atmospheric pressure changes. Overall, my study demonstrated that permafrost thaw in peatlands will result in methane emissions through ebullition that include both young and old carbon, contradictory to the generally accepted paradigm; that ebullition in peatlands is solely a surface process. |
author2 |
Turetsky, Merritt R |
format |
Thesis |
author |
Klapstein, Sara Jane |
author_facet |
Klapstein, Sara Jane |
author_sort |
Klapstein, Sara Jane |
title |
Controls on Ebullition in Alaskan Peatlands Following Permafrost Degradation |
title_short |
Controls on Ebullition in Alaskan Peatlands Following Permafrost Degradation |
title_full |
Controls on Ebullition in Alaskan Peatlands Following Permafrost Degradation |
title_fullStr |
Controls on Ebullition in Alaskan Peatlands Following Permafrost Degradation |
title_full_unstemmed |
Controls on Ebullition in Alaskan Peatlands Following Permafrost Degradation |
title_sort |
controls on ebullition in alaskan peatlands following permafrost degradation |
publishDate |
2012 |
url |
http://hdl.handle.net/10214/3861 |
genre |
Peat permafrost Alaska |
genre_facet |
Peat permafrost Alaska |
op_relation |
http://hdl.handle.net/10214/3861 |
_version_ |
1766162742118449152 |