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dc.contributor.author
Keskitalo, Kirsi H.
dc.contributor.author
Bröder, Lisa
dc.contributor.author
Jong, Dirk
dc.contributor.author
Zimov, Nikita
dc.contributor.author
Davydova, Anna
dc.contributor.author
Davydov, Sergei
dc.contributor.author
Tesi, Tommaso
dc.contributor.author
Mann, Paul J.
dc.contributor.author
Haghipour, Negar
dc.contributor.author
Eglinton, Timothy I.
dc.contributor.author
Vonk, Jorien E.
dc.date.accessioned
2022-05-04T13:00:17Z
dc.date.available
2022-03-07T07:47:36Z
dc.date.available
2022-05-04T13:00:17Z
dc.date.issued
2022-03
dc.identifier.issn
1748-9326
dc.identifier.issn
1748-9318
dc.identifier.other
10.1088/1748-9326/ac4f8d
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/535677
dc.identifier.doi
10.3929/ethz-b-000535677
dc.description.abstract
Major Arctic rivers are undergoing changes due to climate warming with higher discharge and increased amounts of solutes and organic carbon (OC) draining into rivers and coastal seas. Permafrost thaw mobilizes previously frozen OC to the fluvial network where it can be degraded into greenhouse gases and emitted to the atmosphere. Degradation of OC during downstream transport, especially of the particulate OC (POC), is however poorly characterized. Here, we quantified POC degradation in the Kolyma River, the largest river system underlain with continuous permafrost, during 9–15 d whole-water incubations (containing POC and dissolved OC—DOC) during two seasons: spring freshet (early June) and late summer (end of July). Furthermore, we examined interactions between dissolved and particulate phases using parallel incubations of filtered water (only DOC). We measured OC concentrations and carbon isotopes (δ13C, Δ14C) to define carbon losses and to characterize OC composition, respectively. We found that both POC composition and biodegradability differs greatly between seasons. During summer, POC was predominantly autochthonous (47%–95%) and degraded rapidly (∼33% loss) whereas freshet POC was largely of allochthonous origin (77%–96%) and less degradable. Gains in POC concentrations (up to 31%) were observed in freshet waters that could be attributed to flocculation and adsorption of DOC to particles. The demonstrated DOC flocculation and adsorption to POC indicates that the fate and dynamics of the substantially-sized DOC pool may shift from degradation to settling, depending on season and POC concentrations—the latter potentially acting to attenuate greenhouse gas emissions from fluvial systems. We finally note that DOC incubations without POC present may yield degradation estimates that do not reflect degradation in the in situ river conditions, and that interaction between dissolved and particulate phases may be important to consider when determining fluvial carbon dynamics and feedbacks under a changing climate.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
IOP Publishing
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.subject
permafrost
en_US
dc.subject
Arctic
en_US
dc.subject
degradation rate
en_US
dc.subject
carbon isotopes
en_US
dc.subject
adsorption
en_US
dc.subject
flocculation
en_US
dc.title
Seasonal variability in particulate organic carbon degradation in the Kolyma River, Siberia
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
dc.date.published
2022-02-21
ethz.journal.title
Environmental Research Letters
ethz.journal.volume
17
en_US
ethz.journal.issue
3
en_US
ethz.journal.abbreviated
Environ. Res. Lett.
ethz.pages.start
034007
en_US
ethz.size
15 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Bristol
en_US
ethz.publication.status
published
en_US
ethz.date.deposited
2022-03-07T07:48:20Z
ethz.source
WOS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2022-05-04T13:00:24Z
ethz.rosetta.lastUpdated
2022-05-04T13:00:24Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
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