Biological lability of terrestrial DOM increases CO2 outgassing across Arctic shelves
Arctic shelf seas receive greater quantities of river runoff than any other ocean region and are experiencing increased freshwater loads and associated terrestrial matter inputs since recent decades. Amplified terrestrial permafrost thaw and coastal erosion is exposing previously frozen organic matt...
Published in: | Biogeochemistry |
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2022
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Online Access: | https://epic.awi.de/id/eprint/57162/ https://epic.awi.de/id/eprint/57162/1/Polimene_s10533-022-00961-5.pdf https://doi.org/10.1007/s10533-022-00961-5 https://hdl.handle.net/10013/epic.f7f0e7da-aaeb-4afe-8d61-7cc025af3ada |
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ftawi:oai:epic.awi.de:57162 2024-05-19T07:33:25+00:00 Biological lability of terrestrial DOM increases CO2 outgassing across Arctic shelves Polimene, Luca Torres, Ricardo Powley, Helen Bedington, Michael Juhls, Bennet Palmtag, Juri Strauss, Jens Mann, Paul James 2022 application/pdf https://epic.awi.de/id/eprint/57162/ https://epic.awi.de/id/eprint/57162/1/Polimene_s10533-022-00961-5.pdf https://doi.org/10.1007/s10533-022-00961-5 https://hdl.handle.net/10013/epic.f7f0e7da-aaeb-4afe-8d61-7cc025af3ada unknown https://epic.awi.de/id/eprint/57162/1/Polimene_s10533-022-00961-5.pdf Polimene, L. , Torres, R. , Powley, H. , Bedington, M. , Juhls, B. orcid:0000-0002-5844-6318 , Palmtag, J. , Strauss, J. orcid:0000-0003-4678-4982 and Mann, P. J. (2022) Biological lability of terrestrial DOM increases CO2 outgassing across Arctic shelves , Biogeochemistry, 160 (3), pp. 289-300 . doi:10.1007/s10533-022-00961-5 <https://doi.org/10.1007/s10533-022-00961-5> , hdl:10013/epic.f7f0e7da-aaeb-4afe-8d61-7cc025af3ada EPIC3Biogeochemistry, 160(3), pp. 289-300, ISSN: 0168-2563 Article isiRev 2022 ftawi https://doi.org/10.1007/s10533-022-00961-5 2024-04-23T23:38:07Z Arctic shelf seas receive greater quantities of river runoff than any other ocean region and are experiencing increased freshwater loads and associated terrestrial matter inputs since recent decades. Amplified terrestrial permafrost thaw and coastal erosion is exposing previously frozen organic matter, enhancing its mobilization and release to nearshore regions. Changing terrestrial dissolved organic matter (terr-DOM) loads and composition may alter shelf primary productivity and respiration, ultimately affecting net regional CO2 air–sea fluxes. However, the future evolution of Arctic Ocean climate feedbacks are highly dependent upon the biological degradability of terr-DOM in coastal waters, a factor often omitted in modelling studies. Here, we assess the sensitivity of CO2 air–sea fluxes from East Siberian Arctic Shelf (ESAS) waters to changing terr-DOM supply and degradability using a biogeochemical model explicitly accounting for bacteria dynamics and shifting terr-DOM composition. We find increasing terr-DOM loads and degradability trigger a series of biogeochemical and ecological processes shifting ESAS waters from a net sink to a net source of CO2, even after accounting for strengthening coastal productivity by additional land-derived nutrients. Our results suggest that future projected inputs of labile terr-DOM from peat and permafrost thaw may strongly increase the CO2 efflux from the Arctic shelf sea, causing currently unquantified positive feedback to climate change. Article in Journal/Newspaper Arctic Arctic Arctic Ocean Climate change permafrost Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Biogeochemistry 160 3 289 300 |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
unknown |
description |
Arctic shelf seas receive greater quantities of river runoff than any other ocean region and are experiencing increased freshwater loads and associated terrestrial matter inputs since recent decades. Amplified terrestrial permafrost thaw and coastal erosion is exposing previously frozen organic matter, enhancing its mobilization and release to nearshore regions. Changing terrestrial dissolved organic matter (terr-DOM) loads and composition may alter shelf primary productivity and respiration, ultimately affecting net regional CO2 air–sea fluxes. However, the future evolution of Arctic Ocean climate feedbacks are highly dependent upon the biological degradability of terr-DOM in coastal waters, a factor often omitted in modelling studies. Here, we assess the sensitivity of CO2 air–sea fluxes from East Siberian Arctic Shelf (ESAS) waters to changing terr-DOM supply and degradability using a biogeochemical model explicitly accounting for bacteria dynamics and shifting terr-DOM composition. We find increasing terr-DOM loads and degradability trigger a series of biogeochemical and ecological processes shifting ESAS waters from a net sink to a net source of CO2, even after accounting for strengthening coastal productivity by additional land-derived nutrients. Our results suggest that future projected inputs of labile terr-DOM from peat and permafrost thaw may strongly increase the CO2 efflux from the Arctic shelf sea, causing currently unquantified positive feedback to climate change. |
format |
Article in Journal/Newspaper |
author |
Polimene, Luca Torres, Ricardo Powley, Helen Bedington, Michael Juhls, Bennet Palmtag, Juri Strauss, Jens Mann, Paul James |
spellingShingle |
Polimene, Luca Torres, Ricardo Powley, Helen Bedington, Michael Juhls, Bennet Palmtag, Juri Strauss, Jens Mann, Paul James Biological lability of terrestrial DOM increases CO2 outgassing across Arctic shelves |
author_facet |
Polimene, Luca Torres, Ricardo Powley, Helen Bedington, Michael Juhls, Bennet Palmtag, Juri Strauss, Jens Mann, Paul James |
author_sort |
Polimene, Luca |
title |
Biological lability of terrestrial DOM increases CO2 outgassing across Arctic shelves |
title_short |
Biological lability of terrestrial DOM increases CO2 outgassing across Arctic shelves |
title_full |
Biological lability of terrestrial DOM increases CO2 outgassing across Arctic shelves |
title_fullStr |
Biological lability of terrestrial DOM increases CO2 outgassing across Arctic shelves |
title_full_unstemmed |
Biological lability of terrestrial DOM increases CO2 outgassing across Arctic shelves |
title_sort |
biological lability of terrestrial dom increases co2 outgassing across arctic shelves |
publishDate |
2022 |
url |
https://epic.awi.de/id/eprint/57162/ https://epic.awi.de/id/eprint/57162/1/Polimene_s10533-022-00961-5.pdf https://doi.org/10.1007/s10533-022-00961-5 https://hdl.handle.net/10013/epic.f7f0e7da-aaeb-4afe-8d61-7cc025af3ada |
genre |
Arctic Arctic Arctic Ocean Climate change permafrost |
genre_facet |
Arctic Arctic Arctic Ocean Climate change permafrost |
op_source |
EPIC3Biogeochemistry, 160(3), pp. 289-300, ISSN: 0168-2563 |
op_relation |
https://epic.awi.de/id/eprint/57162/1/Polimene_s10533-022-00961-5.pdf Polimene, L. , Torres, R. , Powley, H. , Bedington, M. , Juhls, B. orcid:0000-0002-5844-6318 , Palmtag, J. , Strauss, J. orcid:0000-0003-4678-4982 and Mann, P. J. (2022) Biological lability of terrestrial DOM increases CO2 outgassing across Arctic shelves , Biogeochemistry, 160 (3), pp. 289-300 . doi:10.1007/s10533-022-00961-5 <https://doi.org/10.1007/s10533-022-00961-5> , hdl:10013/epic.f7f0e7da-aaeb-4afe-8d61-7cc025af3ada |
op_doi |
https://doi.org/10.1007/s10533-022-00961-5 |
container_title |
Biogeochemistry |
container_volume |
160 |
container_issue |
3 |
container_start_page |
289 |
op_container_end_page |
300 |
_version_ |
1799471511032037376 |