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...
Published in: | Journal of Geophysical Research: Biogeosciences |
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ftuglasgow:oai:eprints.gla.ac.uk:135999 2023-05-15T14:50:57+02:00 Low photolability of yedoma permafrost dissolved organic carbon Stubbins, Aron Mann, Paul J. Powers, Leanne Bittar, Thais B. Dittmar, Thorsten McIntyre, Cameron P. Eglinton, Timothy I. Zimov, Nikita Spencer, Robert G.M. 2017-01 text http://eprints.gla.ac.uk/135999/ http://eprints.gla.ac.uk/135999/7/135999.pdf en eng American Geophysical Union http://eprints.gla.ac.uk/135999/7/135999.pdf Stubbins, A., Mann, P. J., Powers, L., Bittar, T. B., Dittmar, T., McIntyre, C. P. <http://eprints.gla.ac.uk/view/author/34583.html> , Eglinton, T. I., Zimov, N. and Spencer, R. G.M. (2017) Low photolability of yedoma permafrost dissolved organic carbon. Journal of Geophysical Research: Biogeosciences <http://eprints.gla.ac.uk/view/journal_volume/Journal_of_Geophysical_Research=3A_Biogeosciences.html>, 122(1), pp. 200-211. (doi:10.1002/2016JG003688 <http://dx.doi.org/10.1002/2016JG003688>) Articles PeerReviewed 2017 ftuglasgow https://doi.org/10.1002/2016JG003688 2020-01-10T01:19:00Z 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 University of Glasgow: Enlighten - Publications Arctic Kolyma ENVELOPE(161.000,161.000,69.500,69.500) Journal of Geophysical Research: Biogeosciences 122 1 200 211 |
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Open Polar |
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University of Glasgow: Enlighten - Publications |
op_collection_id |
ftuglasgow |
language |
English |
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 J. Powers, Leanne Bittar, Thais B. Dittmar, Thorsten McIntyre, Cameron P. Eglinton, Timothy I. Zimov, Nikita Spencer, Robert G.M. |
spellingShingle |
Stubbins, Aron Mann, Paul J. Powers, Leanne Bittar, Thais B. Dittmar, Thorsten McIntyre, Cameron P. Eglinton, Timothy I. Zimov, Nikita Spencer, Robert G.M. Low photolability of yedoma permafrost dissolved organic carbon |
author_facet |
Stubbins, Aron Mann, Paul J. Powers, Leanne Bittar, Thais B. Dittmar, Thorsten McIntyre, Cameron P. Eglinton, Timothy I. Zimov, Nikita Spencer, Robert G.M. |
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 |
American Geophysical Union |
publishDate |
2017 |
url |
http://eprints.gla.ac.uk/135999/ http://eprints.gla.ac.uk/135999/7/135999.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 |
http://eprints.gla.ac.uk/135999/7/135999.pdf Stubbins, A., Mann, P. J., Powers, L., Bittar, T. B., Dittmar, T., McIntyre, C. P. <http://eprints.gla.ac.uk/view/author/34583.html> , Eglinton, T. I., Zimov, N. and Spencer, R. G.M. (2017) Low photolability of yedoma permafrost dissolved organic carbon. Journal of Geophysical Research: Biogeosciences <http://eprints.gla.ac.uk/view/journal_volume/Journal_of_Geophysical_Research=3A_Biogeosciences.html>, 122(1), pp. 200-211. (doi:10.1002/2016JG003688 <http://dx.doi.org/10.1002/2016JG003688>) |
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 |
_version_ |
1766322003769294848 |