Aquatic biomass is a major source to particulate organic matter export in large Arctic rivers
Arctic rivers provide an integrated signature of the changing landscape and transmit signals of change to the ocean. Here, we use a decade of particulate organic matter (POM) compositional data to deconvolute multiple allochthonous and autochthonous pan-Arctic and watershed-specific sources. Constra...
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Online Access: | http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10041151/ http://www.ncbi.nlm.nih.gov/pubmed/36913572 https://doi.org/10.1073/pnas.2209883120 |
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ftpubmed:oai:pubmedcentral.nih.gov:10041151 2023-10-09T21:48:03+02:00 Aquatic biomass is a major source to particulate organic matter export in large Arctic rivers Behnke, Megan I. Tank, Suzanne E. McClelland, James W. Holmes, Robert M. Haghipour, Negar Eglinton, Timothy I. Raymond, Peter A. Suslova, Anya Zhulidov, Alexander V. Gurtovaya, Tatiana Zimov, Nikita Zimov, Sergey Mutter, Edda A. Amos, Edwin Spencer, Robert G. M. 2023-03-13 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10041151/ http://www.ncbi.nlm.nih.gov/pubmed/36913572 https://doi.org/10.1073/pnas.2209883120 en eng National Academy of Sciences http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10041151/ http://www.ncbi.nlm.nih.gov/pubmed/36913572 http://dx.doi.org/10.1073/pnas.2209883120 Copyright © 2023 the Author(s). Published by PNAS. https://creativecommons.org/licenses/by-nc-nd/4.0/This article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND) (https://creativecommons.org/licenses/by-nc-nd/4.0/) . Proc Natl Acad Sci U S A Physical Sciences Text 2023 ftpubmed https://doi.org/10.1073/pnas.2209883120 2023-09-17T00:41:24Z Arctic rivers provide an integrated signature of the changing landscape and transmit signals of change to the ocean. Here, we use a decade of particulate organic matter (POM) compositional data to deconvolute multiple allochthonous and autochthonous pan-Arctic and watershed-specific sources. Constraints from carbon-to-nitrogen ratios (C:N), δ(13)C, and Δ(14)C signatures reveal a large, hitherto overlooked contribution from aquatic biomass. Separation in Δ(14)C age is enhanced by splitting soil sources into shallow and deep pools (mean ± SD: −228 ± 211 vs. −492 ± 173‰) rather than traditional active layer and permafrost pools (−300 ± 236 vs. −441 ± 215‰) that do not represent permafrost-free Arctic regions. We estimate that 39 to 60% (5 to 95% credible interval) of the annual pan-Arctic POM flux (averaging 4,391 Gg/y particulate organic carbon from 2012 to 2019) comes from aquatic biomass. The remainder is sourced from yedoma, deep soils, shallow soils, petrogenic inputs, and fresh terrestrial production. Climate change-induced warming and increasing CO(2) concentrations may enhance both soil destabilization and Arctic river aquatic biomass production, increasing fluxes of POM to the ocean. Younger, autochthonous, and older soil-derived POM likely have different destinies (preferential microbial uptake and processing vs. significant sediment burial, respectively). A small (~7%) increase in aquatic biomass POM flux with warming would be equivalent to a ~30% increase in deep soil POM flux. There is a clear need to better quantify how the balance of endmember fluxes may shift with different ramifications for different endmembers and how this will impact the Arctic system. Text Arctic Climate change permafrost PubMed Central (PMC) Arctic Proceedings of the National Academy of Sciences 120 12 |
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PubMed Central (PMC) |
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ftpubmed |
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English |
topic |
Physical Sciences |
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Physical Sciences Behnke, Megan I. Tank, Suzanne E. McClelland, James W. Holmes, Robert M. Haghipour, Negar Eglinton, Timothy I. Raymond, Peter A. Suslova, Anya Zhulidov, Alexander V. Gurtovaya, Tatiana Zimov, Nikita Zimov, Sergey Mutter, Edda A. Amos, Edwin Spencer, Robert G. M. Aquatic biomass is a major source to particulate organic matter export in large Arctic rivers |
topic_facet |
Physical Sciences |
description |
Arctic rivers provide an integrated signature of the changing landscape and transmit signals of change to the ocean. Here, we use a decade of particulate organic matter (POM) compositional data to deconvolute multiple allochthonous and autochthonous pan-Arctic and watershed-specific sources. Constraints from carbon-to-nitrogen ratios (C:N), δ(13)C, and Δ(14)C signatures reveal a large, hitherto overlooked contribution from aquatic biomass. Separation in Δ(14)C age is enhanced by splitting soil sources into shallow and deep pools (mean ± SD: −228 ± 211 vs. −492 ± 173‰) rather than traditional active layer and permafrost pools (−300 ± 236 vs. −441 ± 215‰) that do not represent permafrost-free Arctic regions. We estimate that 39 to 60% (5 to 95% credible interval) of the annual pan-Arctic POM flux (averaging 4,391 Gg/y particulate organic carbon from 2012 to 2019) comes from aquatic biomass. The remainder is sourced from yedoma, deep soils, shallow soils, petrogenic inputs, and fresh terrestrial production. Climate change-induced warming and increasing CO(2) concentrations may enhance both soil destabilization and Arctic river aquatic biomass production, increasing fluxes of POM to the ocean. Younger, autochthonous, and older soil-derived POM likely have different destinies (preferential microbial uptake and processing vs. significant sediment burial, respectively). A small (~7%) increase in aquatic biomass POM flux with warming would be equivalent to a ~30% increase in deep soil POM flux. There is a clear need to better quantify how the balance of endmember fluxes may shift with different ramifications for different endmembers and how this will impact the Arctic system. |
format |
Text |
author |
Behnke, Megan I. Tank, Suzanne E. McClelland, James W. Holmes, Robert M. Haghipour, Negar Eglinton, Timothy I. Raymond, Peter A. Suslova, Anya Zhulidov, Alexander V. Gurtovaya, Tatiana Zimov, Nikita Zimov, Sergey Mutter, Edda A. Amos, Edwin Spencer, Robert G. M. |
author_facet |
Behnke, Megan I. Tank, Suzanne E. McClelland, James W. Holmes, Robert M. Haghipour, Negar Eglinton, Timothy I. Raymond, Peter A. Suslova, Anya Zhulidov, Alexander V. Gurtovaya, Tatiana Zimov, Nikita Zimov, Sergey Mutter, Edda A. Amos, Edwin Spencer, Robert G. M. |
author_sort |
Behnke, Megan I. |
title |
Aquatic biomass is a major source to particulate organic matter export in large Arctic rivers |
title_short |
Aquatic biomass is a major source to particulate organic matter export in large Arctic rivers |
title_full |
Aquatic biomass is a major source to particulate organic matter export in large Arctic rivers |
title_fullStr |
Aquatic biomass is a major source to particulate organic matter export in large Arctic rivers |
title_full_unstemmed |
Aquatic biomass is a major source to particulate organic matter export in large Arctic rivers |
title_sort |
aquatic biomass is a major source to particulate organic matter export in large arctic rivers |
publisher |
National Academy of Sciences |
publishDate |
2023 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10041151/ http://www.ncbi.nlm.nih.gov/pubmed/36913572 https://doi.org/10.1073/pnas.2209883120 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Climate change permafrost |
genre_facet |
Arctic Climate change permafrost |
op_source |
Proc Natl Acad Sci U S A |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10041151/ http://www.ncbi.nlm.nih.gov/pubmed/36913572 http://dx.doi.org/10.1073/pnas.2209883120 |
op_rights |
Copyright © 2023 the Author(s). Published by PNAS. https://creativecommons.org/licenses/by-nc-nd/4.0/This article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND) (https://creativecommons.org/licenses/by-nc-nd/4.0/) . |
op_doi |
https://doi.org/10.1073/pnas.2209883120 |
container_title |
Proceedings of the National Academy of Sciences |
container_volume |
120 |
container_issue |
12 |
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1779311069718642688 |