Landscape-level controls on dissolved carbon flux from diverse catchments of the circumboreal
Author Posting. © American Geophysical Union, 2012. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Global Biogeochemical Cycles 26 (2012): GB0E02, doi:10.1029/2012GB004299. While much of the di...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/5407 2023-05-15T15:15:47+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. 2012-08-21 application/pdf text/plain https://hdl.handle.net/1912/5407 en_US eng American Geophysical Union https://doi.org/10.1029/2012GB004299 Global Biogeochemical Cycles 26 (2012): GB0E02 https://hdl.handle.net/1912/5407 doi:10.1029/2012GB004299 Global Biogeochemical Cycles 26 (2012): GB0E02 doi:10.1029/2012GB004299 Arctic Bicarbonate Dissolved organic carbon Permafrost Article 2012 ftwhoas https://doi.org/10.1029/2012GB004299 2022-05-28T22:58:38Z Author Posting. © American Geophysical Union, 2012. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Global Biogeochemical Cycles 26 (2012): GB0E02, doi:10.1029/2012GB004299. 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 HCO3−. 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. Funding for this work was provided through NSF-OPP-0229302 and NSF-OPP-0732985. Additional support to S.E.T. was provided ... Article in Journal/Newspaper Arctic permafrost Yukon Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Arctic Yukon Global Biogeochemical Cycles 26 4 n/a n/a |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Arctic Bicarbonate Dissolved organic carbon Permafrost |
spellingShingle |
Arctic Bicarbonate Dissolved organic carbon Permafrost 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 |
Arctic Bicarbonate Dissolved organic carbon Permafrost |
description |
Author Posting. © American Geophysical Union, 2012. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Global Biogeochemical Cycles 26 (2012): GB0E02, doi:10.1029/2012GB004299. 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 HCO3−. 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. Funding for this work was provided through NSF-OPP-0229302 and NSF-OPP-0732985. Additional support to S.E.T. was provided ... |
format |
Article in Journal/Newspaper |
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 |
American Geophysical Union |
publishDate |
2012 |
url |
https://hdl.handle.net/1912/5407 |
geographic |
Arctic Yukon |
geographic_facet |
Arctic Yukon |
genre |
Arctic permafrost Yukon |
genre_facet |
Arctic permafrost Yukon |
op_source |
Global Biogeochemical Cycles 26 (2012): GB0E02 doi:10.1029/2012GB004299 |
op_relation |
https://doi.org/10.1029/2012GB004299 Global Biogeochemical Cycles 26 (2012): GB0E02 https://hdl.handle.net/1912/5407 doi:10.1029/2012GB004299 |
op_doi |
https://doi.org/10.1029/2012GB004299 |
container_title |
Global Biogeochemical Cycles |
container_volume |
26 |
container_issue |
4 |
container_start_page |
n/a |
op_container_end_page |
n/a |
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1766346130651611136 |