Arctic Permafrost Thawing Enhances Sulfide Oxidation
Permafrost degradation is altering biogeochemical processes throughout the Arctic. Thaw-induced changes in organic matter transformations and mineral weathering reactions are impacting fluxes of inorganic carbon (IC) and alkalinity (ALK) in Arctic rivers. However, the net impact of these changing fl...
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Online Access: | https://doi.org/10.1029/2022GB007644 http://knowledge.uchicago.edu/record/9798 |
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ftunichicagoknow:oai:uchicago.tind.io:9798 2024-01-14T10:03:05+01:00 Arctic Permafrost Thawing Enhances Sulfide Oxidation Kemeny, Preston Cosslett Li, Gen K. Douglas, Madison Berelson, William Chadwick, Austin J. Dalleska, Nathan F. Lamb, Michael P. Larsen, William Magyar, John S. Rollins, Nick E. Rowland, Joel Smith, M. Isabel Torres, Mark A. Webb, Samuel M. Fischer, Woodward W. West, A. Joshua 2023-11-22T00:37:19Z https://doi.org/10.1029/2022GB007644 http://knowledge.uchicago.edu/record/9798 eng eng https://knowledge.uchicago.edu/record/9798/files/Arctic-Permafrost-Thawing-Enhances-Sulfide-Oxidation.pdf https://knowledge.uchicago.edu/record/9798/files/2022gb007644-sup-0002-data%20set%20si-s01.xlsx https://knowledge.uchicago.edu/record/9798/files/2022gb007644-sup-0001-supporting%20information%20si-s01.pdf doi:https://doi.org/10.1029/2022GB007644 http://knowledge.uchicago.edu/record/9798 http://knowledge.uchicago.edu/record/9798 Text 2023 ftunichicagoknow https://doi.org/10.1029/2022GB007644 2023-12-17T17:49:22Z Permafrost degradation is altering biogeochemical processes throughout the Arctic. Thaw-induced changes in organic matter transformations and mineral weathering reactions are impacting fluxes of inorganic carbon (IC) and alkalinity (ALK) in Arctic rivers. However, the net impact of these changing fluxes on the concentration of carbon dioxide in the atmosphere (pCO 2 ) is relatively unconstrained. Resolving this uncertainty is important as thaw-driven changes in the fluxes of IC and ALK could produce feedbacks in the global carbon cycle. Enhanced production of sulfuric acid through sulfide oxidation is particularly poorly quantified despite its potential to remove ALK from the ocean-atmosphere system and increase pCO 2 , producing a positive feedback leading to more warming and permafrost degradation. In this work, we quantified weathering in the Koyukuk River, a major tributary of the Yukon River draining discontinuous permafrost in central Alaska, based on water and sediment samples collected near the village of Huslia in summer 2018. Using measurements of major ion abundances and sulfate (SO 4 2- ) sulfur ( 34 S/ 32 S) and oxygen ( 18 O/ 16 O) isotope ratios, we employed the MEANDIR inversion model to quantify the relative importance of a suite of weathering processes and their net impact on pCO 2 . Calculations found that approximately 80% of SO 4 2- in mainstem samples derived from sulfide oxidation with the remainder from evaporite dissolution. Moreover, 34 S/ 32 S ratios, 13 C/ 12 C ratios of dissolved IC, and sulfur X-ray absorption spectra of mainstem, secondary channel, and floodplain pore fluid and sediment samples revealed modest degrees of microbial sulfate reduction within the floodplain. Weathering fluxes of ALK and IC result in lower values of pCO 2 over timescales shorter than carbonate compensation (∼10 4 yr) and, for mainstem samples, higher values of pCO 2 over timescales longer than carbonate compensation but shorter than the residence time of marine SO 4 2- (∼10 7 yr). Furthermore, the ... Text Arctic Arctic permafrost Yukon river Alaska Yukon Knowledge@UChicago (University of Chicago) Arctic Yukon Huslia ENVELOPE(8.315,8.315,62.614,62.614) Global Biogeochemical Cycles 37 11 |
institution |
Open Polar |
collection |
Knowledge@UChicago (University of Chicago) |
op_collection_id |
ftunichicagoknow |
language |
English |
description |
Permafrost degradation is altering biogeochemical processes throughout the Arctic. Thaw-induced changes in organic matter transformations and mineral weathering reactions are impacting fluxes of inorganic carbon (IC) and alkalinity (ALK) in Arctic rivers. However, the net impact of these changing fluxes on the concentration of carbon dioxide in the atmosphere (pCO 2 ) is relatively unconstrained. Resolving this uncertainty is important as thaw-driven changes in the fluxes of IC and ALK could produce feedbacks in the global carbon cycle. Enhanced production of sulfuric acid through sulfide oxidation is particularly poorly quantified despite its potential to remove ALK from the ocean-atmosphere system and increase pCO 2 , producing a positive feedback leading to more warming and permafrost degradation. In this work, we quantified weathering in the Koyukuk River, a major tributary of the Yukon River draining discontinuous permafrost in central Alaska, based on water and sediment samples collected near the village of Huslia in summer 2018. Using measurements of major ion abundances and sulfate (SO 4 2- ) sulfur ( 34 S/ 32 S) and oxygen ( 18 O/ 16 O) isotope ratios, we employed the MEANDIR inversion model to quantify the relative importance of a suite of weathering processes and their net impact on pCO 2 . Calculations found that approximately 80% of SO 4 2- in mainstem samples derived from sulfide oxidation with the remainder from evaporite dissolution. Moreover, 34 S/ 32 S ratios, 13 C/ 12 C ratios of dissolved IC, and sulfur X-ray absorption spectra of mainstem, secondary channel, and floodplain pore fluid and sediment samples revealed modest degrees of microbial sulfate reduction within the floodplain. Weathering fluxes of ALK and IC result in lower values of pCO 2 over timescales shorter than carbonate compensation (∼10 4 yr) and, for mainstem samples, higher values of pCO 2 over timescales longer than carbonate compensation but shorter than the residence time of marine SO 4 2- (∼10 7 yr). Furthermore, the ... |
format |
Text |
author |
Kemeny, Preston Cosslett Li, Gen K. Douglas, Madison Berelson, William Chadwick, Austin J. Dalleska, Nathan F. Lamb, Michael P. Larsen, William Magyar, John S. Rollins, Nick E. Rowland, Joel Smith, M. Isabel Torres, Mark A. Webb, Samuel M. Fischer, Woodward W. West, A. Joshua |
spellingShingle |
Kemeny, Preston Cosslett Li, Gen K. Douglas, Madison Berelson, William Chadwick, Austin J. Dalleska, Nathan F. Lamb, Michael P. Larsen, William Magyar, John S. Rollins, Nick E. Rowland, Joel Smith, M. Isabel Torres, Mark A. Webb, Samuel M. Fischer, Woodward W. West, A. Joshua Arctic Permafrost Thawing Enhances Sulfide Oxidation |
author_facet |
Kemeny, Preston Cosslett Li, Gen K. Douglas, Madison Berelson, William Chadwick, Austin J. Dalleska, Nathan F. Lamb, Michael P. Larsen, William Magyar, John S. Rollins, Nick E. Rowland, Joel Smith, M. Isabel Torres, Mark A. Webb, Samuel M. Fischer, Woodward W. West, A. Joshua |
author_sort |
Kemeny, Preston Cosslett |
title |
Arctic Permafrost Thawing Enhances Sulfide Oxidation |
title_short |
Arctic Permafrost Thawing Enhances Sulfide Oxidation |
title_full |
Arctic Permafrost Thawing Enhances Sulfide Oxidation |
title_fullStr |
Arctic Permafrost Thawing Enhances Sulfide Oxidation |
title_full_unstemmed |
Arctic Permafrost Thawing Enhances Sulfide Oxidation |
title_sort |
arctic permafrost thawing enhances sulfide oxidation |
publishDate |
2023 |
url |
https://doi.org/10.1029/2022GB007644 http://knowledge.uchicago.edu/record/9798 |
long_lat |
ENVELOPE(8.315,8.315,62.614,62.614) |
geographic |
Arctic Yukon Huslia |
geographic_facet |
Arctic Yukon Huslia |
genre |
Arctic Arctic permafrost Yukon river Alaska Yukon |
genre_facet |
Arctic Arctic permafrost Yukon river Alaska Yukon |
op_source |
http://knowledge.uchicago.edu/record/9798 |
op_relation |
https://knowledge.uchicago.edu/record/9798/files/Arctic-Permafrost-Thawing-Enhances-Sulfide-Oxidation.pdf https://knowledge.uchicago.edu/record/9798/files/2022gb007644-sup-0002-data%20set%20si-s01.xlsx https://knowledge.uchicago.edu/record/9798/files/2022gb007644-sup-0001-supporting%20information%20si-s01.pdf doi:https://doi.org/10.1029/2022GB007644 http://knowledge.uchicago.edu/record/9798 |
op_doi |
https://doi.org/10.1029/2022GB007644 |
container_title |
Global Biogeochemical Cycles |
container_volume |
37 |
container_issue |
11 |
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1788058074976616448 |