Methane Production and Consumption in Alaskan Arctic Lake Sediments
Methanogenesis and methane oxidation were studied in the sediments of 6 Alaskan arctic lakes during the 2010 and 2011 thaw seasons. Rates of methane production were significantly higher in shallow than in deep lake types, varying from 848 to 21791 μmol m-2 d-1 and were correlated to sedimentation ra...
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University of North Carolina at Chapel Hill
2012
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ftcarolinadr:cdr.lib.unc.edu:cf95jb869 2023-06-11T04:08:55+02:00 Methane Production and Consumption in Alaskan Arctic Lake Sediments Bretz, Kristen Alexandra Gillings School of Global Public Health, Department of Environmental Sciences and Engineering Whalen, Stephen 2012-08 https://doi.org/10.17615/yfr4-wy12 https://cdr.lib.unc.edu/downloads/tb09j597n?file=thumbnail https://cdr.lib.unc.edu/downloads/tb09j597n English eng University of North Carolina at Chapel Hill https://doi.org/10.17615/yfr4-wy12 https://cdr.lib.unc.edu/downloads/tb09j597n?file=thumbnail https://cdr.lib.unc.edu/downloads/tb09j597n http://rightsstatements.org/vocab/InC/1.0/ Masters Thesis 2012 ftcarolinadr https://doi.org/10.17615/yfr4-wy12 2023-05-28T20:42:39Z Methanogenesis and methane oxidation were studied in the sediments of 6 Alaskan arctic lakes during the 2010 and 2011 thaw seasons. Rates of methane production were significantly higher in shallow than in deep lake types, varying from 848 to 21791 μmol m-2 d-1 and were correlated to sedimentation rate and oxygen penetration depth; the data overall indicate that higher organic supply to sediments leads to greater methanogenic activity. Addition of hydrogen provided a significantly stimulating effect on methanogenesis in sediments from every lake, while other methanogenic substrates and alternate electron acceptors (NO3-, Fe3+, SO42-) had variable effects. Methane oxidation rates were much more consistent among lakes (246 μmol m-2 d-1 to 536 μmol m-2 d-1). Increased loading of nutrients and organic matter to lakes from melting permafrost along with warming sediment temperatures may stimulate methanogenesis, but based on calculated rates of CH4 diffusion to oxic sediments, methane oxidize Master of Science Master Thesis Arctic permafrost Carolina Digital Repository (UNC - University of North Carolina) Arctic Arctic Lake ENVELOPE(-130.826,-130.826,57.231,57.231) |
institution |
Open Polar |
collection |
Carolina Digital Repository (UNC - University of North Carolina) |
op_collection_id |
ftcarolinadr |
language |
English |
description |
Methanogenesis and methane oxidation were studied in the sediments of 6 Alaskan arctic lakes during the 2010 and 2011 thaw seasons. Rates of methane production were significantly higher in shallow than in deep lake types, varying from 848 to 21791 μmol m-2 d-1 and were correlated to sedimentation rate and oxygen penetration depth; the data overall indicate that higher organic supply to sediments leads to greater methanogenic activity. Addition of hydrogen provided a significantly stimulating effect on methanogenesis in sediments from every lake, while other methanogenic substrates and alternate electron acceptors (NO3-, Fe3+, SO42-) had variable effects. Methane oxidation rates were much more consistent among lakes (246 μmol m-2 d-1 to 536 μmol m-2 d-1). Increased loading of nutrients and organic matter to lakes from melting permafrost along with warming sediment temperatures may stimulate methanogenesis, but based on calculated rates of CH4 diffusion to oxic sediments, methane oxidize Master of Science |
author2 |
Gillings School of Global Public Health, Department of Environmental Sciences and Engineering Whalen, Stephen |
format |
Master Thesis |
author |
Bretz, Kristen Alexandra |
spellingShingle |
Bretz, Kristen Alexandra Methane Production and Consumption in Alaskan Arctic Lake Sediments |
author_facet |
Bretz, Kristen Alexandra |
author_sort |
Bretz, Kristen Alexandra |
title |
Methane Production and Consumption in Alaskan Arctic Lake Sediments |
title_short |
Methane Production and Consumption in Alaskan Arctic Lake Sediments |
title_full |
Methane Production and Consumption in Alaskan Arctic Lake Sediments |
title_fullStr |
Methane Production and Consumption in Alaskan Arctic Lake Sediments |
title_full_unstemmed |
Methane Production and Consumption in Alaskan Arctic Lake Sediments |
title_sort |
methane production and consumption in alaskan arctic lake sediments |
publisher |
University of North Carolina at Chapel Hill |
publishDate |
2012 |
url |
https://doi.org/10.17615/yfr4-wy12 https://cdr.lib.unc.edu/downloads/tb09j597n?file=thumbnail https://cdr.lib.unc.edu/downloads/tb09j597n |
long_lat |
ENVELOPE(-130.826,-130.826,57.231,57.231) |
geographic |
Arctic Arctic Lake |
geographic_facet |
Arctic Arctic Lake |
genre |
Arctic permafrost |
genre_facet |
Arctic permafrost |
op_relation |
https://doi.org/10.17615/yfr4-wy12 https://cdr.lib.unc.edu/downloads/tb09j597n?file=thumbnail https://cdr.lib.unc.edu/downloads/tb09j597n |
op_rights |
http://rightsstatements.org/vocab/InC/1.0/ |
op_doi |
https://doi.org/10.17615/yfr4-wy12 |
_version_ |
1768382564897128448 |