Landscape-level controls on dissolved carbon flux from diverse catchments of the circumboreal

While much of the dissolved organic carbon (DOC) within rivers is destined for mineralization to CO2, a substantial fraction of riverine bicarbonate (HCO3-) flux represents a CO2 sink, as a result of weathering processes that sequester CO2 as HCO 3-. We explored landscape-level controls on DOC and H...

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Published in:Global Biogeochemical Cycles
Main Authors: Tank, Suzanne E., Frey, Karen E., Striegl, Robert G., Raymond, Peter A., Holmes, Robert M., McClelland, James W., Peterson, Bruce J.
Format: Text
Language:unknown
Published: Clark Digital Commons 2012
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Online Access:https://commons.clarku.edu/faculty_geography/230
https://doi.org/10.1029/2012GB004299
https://commons.clarku.edu/context/faculty_geography/article/1229/viewcontent/GeogFacWorks_Frey_Landscape_2012.pdf
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spelling ftclarkuniv:oai:commons.clarku.edu:faculty_geography-1229 2023-09-05T13:22:26+02:00 Landscape-level controls on dissolved carbon flux from diverse catchments of the circumboreal Tank, Suzanne E. Frey, Karen E. Striegl, Robert G. Raymond, Peter A. Holmes, Robert M. McClelland, James W. Peterson, Bruce J. 2012-01-01T08:00:00Z application/pdf https://commons.clarku.edu/faculty_geography/230 https://doi.org/10.1029/2012GB004299 https://commons.clarku.edu/context/faculty_geography/article/1229/viewcontent/GeogFacWorks_Frey_Landscape_2012.pdf unknown Clark Digital Commons https://commons.clarku.edu/faculty_geography/230 doi:10.1029/2012GB004299 https://commons.clarku.edu/context/faculty_geography/article/1229/viewcontent/GeogFacWorks_Frey_Landscape_2012.pdf Geography bicarbonate biogeochemistry Boreal Kingdom carbon dioxide carbon fixation carbon flux carbon sequestration carbon sink catchment chemical weathering dissolved organic carbon mineralization multivariate analysis permafrost runoff spatial analysis sulfate Hydrology text 2012 ftclarkuniv https://doi.org/10.1029/2012GB004299 2023-08-14T06:16:31Z While much of the dissolved organic carbon (DOC) within rivers is destined for mineralization to CO2, a substantial fraction of riverine bicarbonate (HCO3-) flux represents a CO2 sink, as a result of weathering processes that sequester CO2 as HCO 3-. We explored landscape-level controls on DOC and HCO3- flux in subcatchments of the boreal, with a specific focus on the effect of permafrost on riverine dissolved C flux. To do this, we undertook a multivariate analysis that partitioned the variance attributable to known, key regulators of dissolved C flux (runoff, lithology, and vegetation) prior to examining the effect of permafrost, using riverine biogeochemistry data from a suite of subcatchments drawn from the Mackenzie, Yukon, East, and West Siberian regions of the circumboreal. Across the diverse catchments that we study, controls on HCO3- flux were near-universal: runoff and an increased carbonate rock contribution to weathering (assessed as riverwater Ca:Na) increased HCO3- yields, while increasing permafrost extent was associated with decreases in HCO3-. In contrast, permafrost had contrasting and region-specific effects on DOC yield, even after the variation caused by other key drivers of its flux had been accounted for. We used ionic ratios and SO4 yields to calculate the potential range of CO2 sequestered via weathering across these boreal subcatchments, and show that decreasing permafrost extent is associated with increases in weathering-mediated CO2 fixation across broad spatial scales, an effect that could counterbalance some of the organic C mineralization that is predicted with declining permafrost. © 2012. American Geophysical Union. All Rights Reserved. Text permafrost Yukon Clark University: Clark Digital Commons Yukon Global Biogeochemical Cycles 26 4
institution Open Polar
collection Clark University: Clark Digital Commons
op_collection_id ftclarkuniv
language unknown
topic bicarbonate
biogeochemistry
Boreal Kingdom
carbon dioxide
carbon fixation
carbon flux
carbon sequestration
carbon sink
catchment
chemical weathering
dissolved organic carbon
mineralization
multivariate analysis
permafrost
runoff
spatial analysis
sulfate
Hydrology
spellingShingle bicarbonate
biogeochemistry
Boreal Kingdom
carbon dioxide
carbon fixation
carbon flux
carbon sequestration
carbon sink
catchment
chemical weathering
dissolved organic carbon
mineralization
multivariate analysis
permafrost
runoff
spatial analysis
sulfate
Hydrology
Tank, Suzanne E.
Frey, Karen E.
Striegl, Robert G.
Raymond, Peter A.
Holmes, Robert M.
McClelland, James W.
Peterson, Bruce J.
Landscape-level controls on dissolved carbon flux from diverse catchments of the circumboreal
topic_facet bicarbonate
biogeochemistry
Boreal Kingdom
carbon dioxide
carbon fixation
carbon flux
carbon sequestration
carbon sink
catchment
chemical weathering
dissolved organic carbon
mineralization
multivariate analysis
permafrost
runoff
spatial analysis
sulfate
Hydrology
description While much of the dissolved organic carbon (DOC) within rivers is destined for mineralization to CO2, a substantial fraction of riverine bicarbonate (HCO3-) flux represents a CO2 sink, as a result of weathering processes that sequester CO2 as HCO 3-. We explored landscape-level controls on DOC and HCO3- flux in subcatchments of the boreal, with a specific focus on the effect of permafrost on riverine dissolved C flux. To do this, we undertook a multivariate analysis that partitioned the variance attributable to known, key regulators of dissolved C flux (runoff, lithology, and vegetation) prior to examining the effect of permafrost, using riverine biogeochemistry data from a suite of subcatchments drawn from the Mackenzie, Yukon, East, and West Siberian regions of the circumboreal. Across the diverse catchments that we study, controls on HCO3- flux were near-universal: runoff and an increased carbonate rock contribution to weathering (assessed as riverwater Ca:Na) increased HCO3- yields, while increasing permafrost extent was associated with decreases in HCO3-. In contrast, permafrost had contrasting and region-specific effects on DOC yield, even after the variation caused by other key drivers of its flux had been accounted for. We used ionic ratios and SO4 yields to calculate the potential range of CO2 sequestered via weathering across these boreal subcatchments, and show that decreasing permafrost extent is associated with increases in weathering-mediated CO2 fixation across broad spatial scales, an effect that could counterbalance some of the organic C mineralization that is predicted with declining permafrost. © 2012. American Geophysical Union. All Rights Reserved.
format Text
author Tank, Suzanne E.
Frey, Karen E.
Striegl, Robert G.
Raymond, Peter A.
Holmes, Robert M.
McClelland, James W.
Peterson, Bruce J.
author_facet Tank, Suzanne E.
Frey, Karen E.
Striegl, Robert G.
Raymond, Peter A.
Holmes, Robert M.
McClelland, James W.
Peterson, Bruce J.
author_sort Tank, Suzanne E.
title Landscape-level controls on dissolved carbon flux from diverse catchments of the circumboreal
title_short Landscape-level controls on dissolved carbon flux from diverse catchments of the circumboreal
title_full Landscape-level controls on dissolved carbon flux from diverse catchments of the circumboreal
title_fullStr Landscape-level controls on dissolved carbon flux from diverse catchments of the circumboreal
title_full_unstemmed Landscape-level controls on dissolved carbon flux from diverse catchments of the circumboreal
title_sort landscape-level controls on dissolved carbon flux from diverse catchments of the circumboreal
publisher Clark Digital Commons
publishDate 2012
url https://commons.clarku.edu/faculty_geography/230
https://doi.org/10.1029/2012GB004299
https://commons.clarku.edu/context/faculty_geography/article/1229/viewcontent/GeogFacWorks_Frey_Landscape_2012.pdf
geographic Yukon
geographic_facet Yukon
genre permafrost
Yukon
genre_facet permafrost
Yukon
op_source Geography
op_relation https://commons.clarku.edu/faculty_geography/230
doi:10.1029/2012GB004299
https://commons.clarku.edu/context/faculty_geography/article/1229/viewcontent/GeogFacWorks_Frey_Landscape_2012.pdf
op_doi https://doi.org/10.1029/2012GB004299
container_title Global Biogeochemical Cycles
container_volume 26
container_issue 4
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