Low photolability of yedoma permafrost dissolved organic carbon
Vast stores of arctic permafrost carbon that have remained frozen for millennia are thawing, releasing ancient dissolved organic carbon (DOC) to arctic inland waters. Once in arctic waters, DOC can be converted to CO2 and emitted to the atmosphere, accelerating climate change. Sunlight-driven photor...
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ftunivnorthumb:oai:nrl.northumbria.ac.uk:28983 2023-05-15T14:50:55+02:00 Low photolability of yedoma permafrost dissolved organic carbon Stubbins, Aron Mann, Paul Powers, Leanne Bittar, Thais Dittmar, Thorsten McIntyre, Cameron Eglinton, Timothy Zimov, Nikita Soencer, Robert 2016-02-09 text https://nrl.northumbria.ac.uk/id/eprint/28983/ https://doi.org/10.1002/2016JG003688 https://nrl.northumbria.ac.uk/id/eprint/28983/1/799574_1_unknown_upload_4415062_4hzwp6.pdf en eng Wiley-Blackwell https://nrl.northumbria.ac.uk/id/eprint/28983/1/799574_1_unknown_upload_4415062_4hzwp6.pdf Stubbins, Aron, Mann, Paul, Powers, Leanne, Bittar, Thais, Dittmar, Thorsten, McIntyre, Cameron, Eglinton, Timothy, Zimov, Nikita and Soencer, Robert (2016) Low photolability of yedoma permafrost dissolved organic carbon. Journal of Geophysical Research: Biogeosciences, 122 (1). ISSN 2169-8961 F800 Physical and Terrestrial Geographical and Environmental Sciences Article PeerReviewed 2016 ftunivnorthumb https://doi.org/10.1002/2016JG003688 2022-09-25T06:04:52Z Vast stores of arctic permafrost carbon that have remained frozen for millennia are thawing, releasing ancient dissolved organic carbon (DOC) to arctic inland waters. Once in arctic waters, DOC can be converted to CO2 and emitted to the atmosphere, accelerating climate change. Sunlight-driven photoreactions oxidize DOC, converting a portion to CO2 and leaving behind a photomodified pool of dissolved organic matter (DOM). Samples from the Kolyma River, its tributaries, and streams draining thawing yedoma permafrost were collected. Irradiation experiments and radiocarbon dating were employed to assess the photolability of ancient permafrost-DOC in natural and laboratory generated samples containing a mix of modern and ancient DOC. Photolabile DOC was always modern, with no measurable photochemical loss of ancient permafrost-DOC. However, optical and ultrahigh resolution mass spectrometric measurements revealed that both modern river DOM and ancient permafrost-DOM were photomodified during the irradiations, converting aromatic compounds to less conjugated compounds. These findings suggest that although sunlight-driven photoreactions do not directly mineralize permafrost-DOC, photomodification of permafrost-DOM chemistry may influence its fate and ecological functions in aquatic systems. Article in Journal/Newspaper Arctic Climate change kolyma river permafrost Northumbria University, Newcastle: Northumbria Research Link (NRL) Arctic Kolyma ENVELOPE(161.000,161.000,69.500,69.500) Journal of Geophysical Research: Biogeosciences 122 1 200 211 |
institution |
Open Polar |
collection |
Northumbria University, Newcastle: Northumbria Research Link (NRL) |
op_collection_id |
ftunivnorthumb |
language |
English |
topic |
F800 Physical and Terrestrial Geographical and Environmental Sciences |
spellingShingle |
F800 Physical and Terrestrial Geographical and Environmental Sciences Stubbins, Aron Mann, Paul Powers, Leanne Bittar, Thais Dittmar, Thorsten McIntyre, Cameron Eglinton, Timothy Zimov, Nikita Soencer, Robert Low photolability of yedoma permafrost dissolved organic carbon |
topic_facet |
F800 Physical and Terrestrial Geographical and Environmental Sciences |
description |
Vast stores of arctic permafrost carbon that have remained frozen for millennia are thawing, releasing ancient dissolved organic carbon (DOC) to arctic inland waters. Once in arctic waters, DOC can be converted to CO2 and emitted to the atmosphere, accelerating climate change. Sunlight-driven photoreactions oxidize DOC, converting a portion to CO2 and leaving behind a photomodified pool of dissolved organic matter (DOM). Samples from the Kolyma River, its tributaries, and streams draining thawing yedoma permafrost were collected. Irradiation experiments and radiocarbon dating were employed to assess the photolability of ancient permafrost-DOC in natural and laboratory generated samples containing a mix of modern and ancient DOC. Photolabile DOC was always modern, with no measurable photochemical loss of ancient permafrost-DOC. However, optical and ultrahigh resolution mass spectrometric measurements revealed that both modern river DOM and ancient permafrost-DOM were photomodified during the irradiations, converting aromatic compounds to less conjugated compounds. These findings suggest that although sunlight-driven photoreactions do not directly mineralize permafrost-DOC, photomodification of permafrost-DOM chemistry may influence its fate and ecological functions in aquatic systems. |
format |
Article in Journal/Newspaper |
author |
Stubbins, Aron Mann, Paul Powers, Leanne Bittar, Thais Dittmar, Thorsten McIntyre, Cameron Eglinton, Timothy Zimov, Nikita Soencer, Robert |
author_facet |
Stubbins, Aron Mann, Paul Powers, Leanne Bittar, Thais Dittmar, Thorsten McIntyre, Cameron Eglinton, Timothy Zimov, Nikita Soencer, Robert |
author_sort |
Stubbins, Aron |
title |
Low photolability of yedoma permafrost dissolved organic carbon |
title_short |
Low photolability of yedoma permafrost dissolved organic carbon |
title_full |
Low photolability of yedoma permafrost dissolved organic carbon |
title_fullStr |
Low photolability of yedoma permafrost dissolved organic carbon |
title_full_unstemmed |
Low photolability of yedoma permafrost dissolved organic carbon |
title_sort |
low photolability of yedoma permafrost dissolved organic carbon |
publisher |
Wiley-Blackwell |
publishDate |
2016 |
url |
https://nrl.northumbria.ac.uk/id/eprint/28983/ https://doi.org/10.1002/2016JG003688 https://nrl.northumbria.ac.uk/id/eprint/28983/1/799574_1_unknown_upload_4415062_4hzwp6.pdf |
long_lat |
ENVELOPE(161.000,161.000,69.500,69.500) |
geographic |
Arctic Kolyma |
geographic_facet |
Arctic Kolyma |
genre |
Arctic Climate change kolyma river permafrost |
genre_facet |
Arctic Climate change kolyma river permafrost |
op_relation |
https://nrl.northumbria.ac.uk/id/eprint/28983/1/799574_1_unknown_upload_4415062_4hzwp6.pdf Stubbins, Aron, Mann, Paul, Powers, Leanne, Bittar, Thais, Dittmar, Thorsten, McIntyre, Cameron, Eglinton, Timothy, Zimov, Nikita and Soencer, Robert (2016) Low photolability of yedoma permafrost dissolved organic carbon. Journal of Geophysical Research: Biogeosciences, 122 (1). ISSN 2169-8961 |
op_doi |
https://doi.org/10.1002/2016JG003688 |
container_title |
Journal of Geophysical Research: Biogeosciences |
container_volume |
122 |
container_issue |
1 |
container_start_page |
200 |
op_container_end_page |
211 |
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1766321969863589888 |