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Controls on the 14C...
Controls on the 14C Content of Dissolved and Particulate Organic Carbon Mobilized Across the Mackenzie River Basin, Canada
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- Campeau, Audrey (författare)
- Uppsala universitet,Luft-, vatten- och landskapslära,Swedish Univ Agr Sci, Dept Forest Ecol & Management, Umeå, Sweden.
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- Soerensen, Anne L. (författare)
- Stockholms universitet,Naturhistoriska riksmuseet,Enheten för miljöforskning och övervakning,Institutionen för miljövetenskap och analytisk kemi,Swedish Museum of Natural History, Sweden,Stockholm Univ, Dept Environm Sci & Analyt Chem, Stockholm, Sweden.;Swedish Museum Nat Hist, Dept Environm Res & Monitoring, Stockholm, Sweden.
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- Martma, T (författare)
- Tallinn University of Technology,Tallinn Univ Technol, Dept Geol, Tallinn, Estonia.
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- Åkeblom, Staffan (författare)
- Statist Sweden, Stat Cent Byran SCB, Stockholm, Sweden.
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- Zdanowicz, Christian, 1966- (författare)
- Uppsala universitet,Luft-, vatten- och landskapslära
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(creator_code:org_t)
- AMER GEOPHYSICAL UNION, 2020
- 2020
- Engelska.
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Ingår i: Global Biogeochemical Cycles. - : AMER GEOPHYSICAL UNION. - 0886-6236 .- 1944-9224. ; 34:12
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https://nrm.diva-por... (primary) (Raw object)
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https://doi.org/10.1...
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https://uu.diva-port... (primary) (Raw object)
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The Mackenzie River Basin (MRB) delivers large quantities of organic carbon (OC) into the Arctic Ocean, with significant implications for the global C budgets and ocean biogeochemistry. The amount and properties of OC in the Mackenzie River's delta have been well monitored in the last decade, but the spatial variability in OC sources transported by its different tributaries is still unclear. Here we present new data on the radiocarbon (14C) content of dissolved and particulate OC (Δ14C‐DOC and Δ14C‐POC) across the mainstem and major tributaries of the MRB, comprising 19 different locations, to identify factors controlling spatial patterns in riverine OC sources. The Δ14C‐DOC and Δ14C‐POC varied across a large range, from −179.9‰ to 62.9‰, and −728.8‰ to −9.0‰, respectively. Our data reveal a positive spatial coupling between the Δ14C of DOC and POC across the MRB, whereby the most 14C‐depleted waters were issued from the mountainous west bank of the MRB. This 14C‐depleted DOC and POC likely originates from a combination of petrogenic sources, connected with the presence of kerogens in the bedrock, and biogenic sources, mobilized by thawing permafrost. Our analysis also reveals intriguing relationships between Δ14C of DOC and POC with turbidity, water stable isotope ratio and catchment elevation, indicating that hydrology and geomorphology are key to understanding riverine OC sources in this landscape. A closer examination of the specific mechanisms giving rise to these relationships is recommended. For now, this study provides a road map of the key OC sources in this rapidly changing river basin.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Annan geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Other Earth and Related Environmental Sciences (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geokemi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geochemistry (hsv//eng)
Nyckelord
- arctic rivers
- dissolved organic carbon
- particulate organic carbon
- radiocarbon
- Man and the environment
- Naturmiljö och människan
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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