Patterns and isotopic composition of greenhouse gases under ice in lakes of interior Alaska
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 seaso...
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Online Access: | https://doi.org/10.1088/1748-9326/abb493 https://doaj.org/article/c4a7e1ed9ceb40a196e73cc809e0f93f |
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ftdoajarticles:oai:doaj.org/article:c4a7e1ed9ceb40a196e73cc809e0f93f 2023-09-05T13:17:43+02:00 Patterns and isotopic composition of greenhouse gases under ice in lakes of interior Alaska Madeline O’Dwyer David E Butman Robert G Striegl Mark M Dornblaser Kimberly P Wickland Catherine D Kuhn Matthew J Bogard 2020-01-01T00:00:00Z https://doi.org/10.1088/1748-9326/abb493 https://doaj.org/article/c4a7e1ed9ceb40a196e73cc809e0f93f EN eng IOP Publishing https://doi.org/10.1088/1748-9326/abb493 https://doaj.org/toc/1748-9326 doi:10.1088/1748-9326/abb493 1748-9326 https://doaj.org/article/c4a7e1ed9ceb40a196e73cc809e0f93f Environmental Research Letters, Vol 15, Iss 10, p 105016 (2020) boreal lake CO2 CH4 winter stable isotopes Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 article 2020 ftdoajarticles https://doi.org/10.1088/1748-9326/abb493 2023-08-13T00:37:16Z 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 Directory of Open Access Journals: DOAJ Articles Arctic Boreal Lake ENVELOPE(-127.670,-127.670,58.802,58.802) Yukon Environmental Research Letters 15 10 105016 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
boreal lake CO2 CH4 winter stable isotopes Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 |
spellingShingle |
boreal lake CO2 CH4 winter stable isotopes Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 Madeline O’Dwyer David E Butman Robert G Striegl Mark M Dornblaser Kimberly P Wickland Catherine D Kuhn Matthew J Bogard Patterns and isotopic composition of greenhouse gases under ice in lakes of interior Alaska |
topic_facet |
boreal lake CO2 CH4 winter stable isotopes Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Madeline O’Dwyer David E Butman Robert G Striegl Mark M Dornblaser Kimberly P Wickland Catherine D Kuhn Matthew J Bogard |
author_facet |
Madeline O’Dwyer David E Butman Robert G Striegl Mark M Dornblaser Kimberly P Wickland Catherine D Kuhn Matthew J Bogard |
author_sort |
Madeline O’Dwyer |
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 |
https://doi.org/10.1088/1748-9326/abb493 https://doaj.org/article/c4a7e1ed9ceb40a196e73cc809e0f93f |
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, Vol 15, Iss 10, p 105016 (2020) |
op_relation |
https://doi.org/10.1088/1748-9326/abb493 https://doaj.org/toc/1748-9326 doi:10.1088/1748-9326/abb493 1748-9326 https://doaj.org/article/c4a7e1ed9ceb40a196e73cc809e0f93f |
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_ |
1776198782442012672 |