Patterns and isotopic composition of greenhouse gases under ice in lakes of interior Alaska
Abstract Arctic and boreal lake greenhouse gas emissions (GHG) are an important component of regional carbon (C) budgets. Yet the magnitude and seasonal patterns of lake GHG emissions are poorly constrained, because sampling is limited in these remote landscapes, particularly during winter and shoul...
Published in: | Environmental Research Letters |
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crioppubl:10.1088/1748-9326/abb493 2024-09-30T14:31:36+00:00 Patterns and isotopic composition of greenhouse gases under ice in lakes of interior Alaska O’Dwyer, Madeline Butman, David E Striegl, Robert G Dornblaser, Mark M Wickland, Kimberly P Kuhn, Catherine D Bogard, Matthew J National Aeronautics and Space Administration University of Washington U.S. Geological Survey 2020 http://dx.doi.org/10.1088/1748-9326/abb493 https://iopscience.iop.org/article/10.1088/1748-9326/abb493 https://iopscience.iop.org/article/10.1088/1748-9326/abb493/pdf https://iopscience.iop.org/article/10.1088/1748-9326/abb493/ampdf unknown IOP Publishing http://creativecommons.org/licenses/by/4.0 https://iopscience.iop.org/info/page/text-and-data-mining Environmental Research Letters volume 15, issue 10, page 105016 ISSN 1748-9326 journal-article 2020 crioppubl https://doi.org/10.1088/1748-9326/abb493 2024-09-09T05:46:04Z Abstract Arctic and boreal lake greenhouse gas emissions (GHG) are an important component of regional carbon (C) budgets. Yet the magnitude and seasonal patterns of lake GHG emissions are poorly constrained, because sampling is limited in these remote landscapes, particularly during winter and shoulder seasons. To better define patterns of under ice GHG content (and emissions potential at spring thaw), we surveyed carbon dioxide (CO 2 ) and methane (CH 4 ) concentrations and stable isotopic composition during winter of 2017 in 13 lakes in the arid Yukon Flats Basin of interior Alaska, USA. Partial pressures of CO 2 and CH 4 ranged over three orders of magnitude, were positively correlated, and CO 2 exceeded CH 4 at all but one site. Shallow, organic matter-rich lakes located at lower elevations tended to have the highest concentrations of both gases, though CH 4 content was more heterogeneous and only abundant in oxygen-depleted lakes, while CO 2 was negatively correlated to oxygen content. Isotopic values of CO 2 spanned a narrow range (−10‰ to −23‰) compared to CH 4 , which ranged over 50‰ (−19‰ to −71‰), indicating CH 4 source pathways and sink strength varied widely between lakes. Miller-Tans and Keeling plots qualitatively suggested two groups of lakes were present; one with isotopically enriched source CH 4 possibly more dominated by acetoclastic methanogenesis, and one with depleted signatures suggesting a dominance of the hydrogenotrophic production. Overall, regional lake differences in winter under ice GHG content appear to track landscape position, oxygen, and organic matter content and composition, causing patterns to vary widely even within a relatively small geographic area of interior Alaska. Article in Journal/Newspaper Arctic Alaska Yukon IOP Publishing Arctic Boreal Lake ENVELOPE(-127.670,-127.670,58.802,58.802) Yukon Environmental Research Letters 15 10 105016 |
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IOP Publishing |
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crioppubl |
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unknown |
description |
Abstract Arctic and boreal lake greenhouse gas emissions (GHG) are an important component of regional carbon (C) budgets. Yet the magnitude and seasonal patterns of lake GHG emissions are poorly constrained, because sampling is limited in these remote landscapes, particularly during winter and shoulder seasons. To better define patterns of under ice GHG content (and emissions potential at spring thaw), we surveyed carbon dioxide (CO 2 ) and methane (CH 4 ) concentrations and stable isotopic composition during winter of 2017 in 13 lakes in the arid Yukon Flats Basin of interior Alaska, USA. Partial pressures of CO 2 and CH 4 ranged over three orders of magnitude, were positively correlated, and CO 2 exceeded CH 4 at all but one site. Shallow, organic matter-rich lakes located at lower elevations tended to have the highest concentrations of both gases, though CH 4 content was more heterogeneous and only abundant in oxygen-depleted lakes, while CO 2 was negatively correlated to oxygen content. Isotopic values of CO 2 spanned a narrow range (−10‰ to −23‰) compared to CH 4 , which ranged over 50‰ (−19‰ to −71‰), indicating CH 4 source pathways and sink strength varied widely between lakes. Miller-Tans and Keeling plots qualitatively suggested two groups of lakes were present; one with isotopically enriched source CH 4 possibly more dominated by acetoclastic methanogenesis, and one with depleted signatures suggesting a dominance of the hydrogenotrophic production. Overall, regional lake differences in winter under ice GHG content appear to track landscape position, oxygen, and organic matter content and composition, causing patterns to vary widely even within a relatively small geographic area of interior Alaska. |
author2 |
National Aeronautics and Space Administration University of Washington U.S. Geological Survey |
format |
Article in Journal/Newspaper |
author |
O’Dwyer, Madeline Butman, David E Striegl, Robert G Dornblaser, Mark M Wickland, Kimberly P Kuhn, Catherine D Bogard, Matthew J |
spellingShingle |
O’Dwyer, Madeline Butman, David E Striegl, Robert G Dornblaser, Mark M Wickland, Kimberly P Kuhn, Catherine D Bogard, Matthew J Patterns and isotopic composition of greenhouse gases under ice in lakes of interior Alaska |
author_facet |
O’Dwyer, Madeline Butman, David E Striegl, Robert G Dornblaser, Mark M Wickland, Kimberly P Kuhn, Catherine D Bogard, Matthew J |
author_sort |
O’Dwyer, Madeline |
title |
Patterns and isotopic composition of greenhouse gases under ice in lakes of interior Alaska |
title_short |
Patterns and isotopic composition of greenhouse gases under ice in lakes of interior Alaska |
title_full |
Patterns and isotopic composition of greenhouse gases under ice in lakes of interior Alaska |
title_fullStr |
Patterns and isotopic composition of greenhouse gases under ice in lakes of interior Alaska |
title_full_unstemmed |
Patterns and isotopic composition of greenhouse gases under ice in lakes of interior Alaska |
title_sort |
patterns and isotopic composition of greenhouse gases under ice in lakes of interior alaska |
publisher |
IOP Publishing |
publishDate |
2020 |
url |
http://dx.doi.org/10.1088/1748-9326/abb493 https://iopscience.iop.org/article/10.1088/1748-9326/abb493 https://iopscience.iop.org/article/10.1088/1748-9326/abb493/pdf https://iopscience.iop.org/article/10.1088/1748-9326/abb493/ampdf |
long_lat |
ENVELOPE(-127.670,-127.670,58.802,58.802) |
geographic |
Arctic Boreal Lake Yukon |
geographic_facet |
Arctic Boreal Lake Yukon |
genre |
Arctic Alaska Yukon |
genre_facet |
Arctic Alaska Yukon |
op_source |
Environmental Research Letters volume 15, issue 10, page 105016 ISSN 1748-9326 |
op_rights |
http://creativecommons.org/licenses/by/4.0 https://iopscience.iop.org/info/page/text-and-data-mining |
op_doi |
https://doi.org/10.1088/1748-9326/abb493 |
container_title |
Environmental Research Letters |
container_volume |
15 |
container_issue |
10 |
container_start_page |
105016 |
_version_ |
1811636061568237568 |