Methane and Carbon Dioxide Dynamics in Arctic Lake Sediments
Rising global temperatures are expected to increase concentrations of greenhouse gases emitted by northern latitudes within the current century. The impact of global warming on Arctic lacustrine systems is generally unknown, although recent studies have examined fluxes of carbon dioxide (CO₂) and me...
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ftunivarizona:oai:repository.arizona.edu:10150/579063 2023-05-15T12:59:38+02:00 Methane and Carbon Dioxide Dynamics in Arctic Lake Sediments Freitas, Nancy Louise Curry, Joan 2015 http://hdl.handle.net/10150/579063 en_US eng The University of Arizona. http://hdl.handle.net/10150/579063 Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author. text Electronic Thesis 2015 ftunivarizona 2020-06-14T08:13:10Z Rising global temperatures are expected to increase concentrations of greenhouse gases emitted by northern latitudes within the current century. The impact of global warming on Arctic lacustrine systems is generally unknown, although recent studies have examined fluxes of carbon dioxide (CO₂) and methane (CH₄) produced in ebullition events. Few studies have investigated the added impact of atmospheric warming on lake sediments, which produce CO₂ and CH₄ through microbial decomposition and diffusive loss in the water column. To better understand carbon emission scenarios at elevated temperatures, sediment samples from Abisko, Sweden were analyzed for CO₂ and CH₄ production rates through incubation studies, and for concentrations of dissolved inorganic carbon (DIC) and dissolved CH₄ in sediment and porewater. Results showed that room temperature incubations emitted concentrations of CO₂ and CH₄ up to five times greater than those emitted by +5°C incubations. Furthermore, documented peat emissions were one to two orders of magnitude lower than the lake sediment incubation emissions reported in this paper. This study provides some of the first point source microbial emissions by lake sediment depth, and highlights that northern latitude sediments could have unprecedented effects on current spatial and temporal projections of Arctic warming. Thesis Abisko Arctic Global warming The University of Arizona: UA Campus Repository Abisko ENVELOPE(18.829,18.829,68.349,68.349) Arctic Arctic Lake ENVELOPE(-130.826,-130.826,57.231,57.231) |
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Open Polar |
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The University of Arizona: UA Campus Repository |
op_collection_id |
ftunivarizona |
language |
English |
description |
Rising global temperatures are expected to increase concentrations of greenhouse gases emitted by northern latitudes within the current century. The impact of global warming on Arctic lacustrine systems is generally unknown, although recent studies have examined fluxes of carbon dioxide (CO₂) and methane (CH₄) produced in ebullition events. Few studies have investigated the added impact of atmospheric warming on lake sediments, which produce CO₂ and CH₄ through microbial decomposition and diffusive loss in the water column. To better understand carbon emission scenarios at elevated temperatures, sediment samples from Abisko, Sweden were analyzed for CO₂ and CH₄ production rates through incubation studies, and for concentrations of dissolved inorganic carbon (DIC) and dissolved CH₄ in sediment and porewater. Results showed that room temperature incubations emitted concentrations of CO₂ and CH₄ up to five times greater than those emitted by +5°C incubations. Furthermore, documented peat emissions were one to two orders of magnitude lower than the lake sediment incubation emissions reported in this paper. This study provides some of the first point source microbial emissions by lake sediment depth, and highlights that northern latitude sediments could have unprecedented effects on current spatial and temporal projections of Arctic warming. |
author2 |
Curry, Joan |
format |
Thesis |
author |
Freitas, Nancy Louise |
spellingShingle |
Freitas, Nancy Louise Methane and Carbon Dioxide Dynamics in Arctic Lake Sediments |
author_facet |
Freitas, Nancy Louise |
author_sort |
Freitas, Nancy Louise |
title |
Methane and Carbon Dioxide Dynamics in Arctic Lake Sediments |
title_short |
Methane and Carbon Dioxide Dynamics in Arctic Lake Sediments |
title_full |
Methane and Carbon Dioxide Dynamics in Arctic Lake Sediments |
title_fullStr |
Methane and Carbon Dioxide Dynamics in Arctic Lake Sediments |
title_full_unstemmed |
Methane and Carbon Dioxide Dynamics in Arctic Lake Sediments |
title_sort |
methane and carbon dioxide dynamics in arctic lake sediments |
publisher |
The University of Arizona. |
publishDate |
2015 |
url |
http://hdl.handle.net/10150/579063 |
long_lat |
ENVELOPE(18.829,18.829,68.349,68.349) ENVELOPE(-130.826,-130.826,57.231,57.231) |
geographic |
Abisko Arctic Arctic Lake |
geographic_facet |
Abisko Arctic Arctic Lake |
genre |
Abisko Arctic Global warming |
genre_facet |
Abisko Arctic Global warming |
op_relation |
http://hdl.handle.net/10150/579063 |
op_rights |
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author. |
_version_ |
1766067653011570688 |