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dc.contributor.author
Smith, John N.
dc.contributor.author
Karcher, Michael
dc.contributor.author
Casacuberta, Núria
dc.contributor.author
Williams, William J.
dc.contributor.author
Kenna, Tim
dc.contributor.author
Smethie Jr., William M.
dc.date.accessioned
2021-04-16T14:11:05Z
dc.date.available
2021-04-04T07:14:22Z
dc.date.available
2021-04-16T14:11:05Z
dc.date.issued
2021-03
dc.identifier.issn
0148-0227
dc.identifier.issn
2169-9275
dc.identifier.other
10.1029/2020JC016740
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/477409
dc.description.abstract
129I measurements on samples collected during GEOTRACES oceanographic missions in the Arctic Ocean in 2015 have provided the first synoptic 129I sections across the Eurasian, Canada, and Makarov Basins. During the 1990s, increased discharges of 129I from European nuclear fuel reprocessing plants produced a large, tracer spike whose passage through the Arctic Ocean has been followed by 129I time series measurements over the past 25 years. Elevated 129I levels measured over the Lomonosov and Alpha‐Mendeleyev Ridges in 2015 were associated with tracer labeled, Atlantic‐origin water bathymetrically steered by the ridge systems through the central Arctic while lower 129I levels were evident in the more poorly ventilated basin interiors. 129I levels of 200–400 × 107 at/l measured in intermediate waters had increased by a factor of 10 in 2015 compared to 1994–1996 owing to the circulation of the 1990s, 129I input spike. Comparisons of 129I distributions between the mid‐1990s and 2015 delineate large scale circulation changes that occurred during the shift from a positive Arctic Oscillation and a cyclonic circulation regime in the mid‐1990s to anticyclonic circulation in 2015. The latter is characterized by a broadened Beaufort Gyre in the upper ocean, a weakened boundary current and partial mid‐depth, AW flow reversal in the southern Canada Basin. Tracer 129I simulations using the applied circulation model, NAOSIM, agree with both historical 129I results and recent GEOTRACES data sets, thereby supporting the present interpretation of the relationship of changes in arctic circulation to shifts in climate indices revealed by tracer 129I distributions. © 2021 American Geophysical Union
en_US
dc.language.iso
en
en_US
dc.publisher
American Geophysical Union
en_US
dc.title
A Changing Arctic Ocean: How Measured and Modeled 129I Distributions Indicate Fundamental Shifts in Circulation Between 1994 and 2015
en_US
dc.type
Journal Article
dc.date.published
2021-02-12
ethz.journal.title
Journal of Geophysical Research: Oceans
ethz.journal.volume
126
en_US
ethz.journal.issue
3
en_US
ethz.journal.abbreviated
J. geophys. res. Ocean.
ethz.pages.start
e2020JC016740
en_US
ethz.size
21 p.
en_US
ethz.grant
A new multitracer approach in Oceanography: combining U-236 with conventional anthropogenic radionuclides in the Arctic and Atlantic Oceans
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Washington, DC
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02350 - Dep. Umweltsystemwissenschaften / Dep. of Environmental Systems Science::02721 - Inst. f. Biogeochemie u. Schadstoffdyn. / Inst. Biogeochem. and Pollutant Dynamics::09755 - Casacuberta Arola, Núria / Casacuberta Arola, Núria
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02350 - Dep. Umweltsystemwissenschaften / Dep. of Environmental Systems Science::02721 - Inst. f. Biogeochemie u. Schadstoffdyn. / Inst. Biogeochem. and Pollutant Dynamics::09755 - Casacuberta Arola, Núria / Casacuberta Arola, Núria
ethz.grant.agreementno
154805
ethz.grant.agreementno
154805
ethz.grant.fundername
SNF
ethz.grant.fundername
SNF
ethz.grant.funderDoi
10.13039/501100001711
ethz.grant.funderDoi
10.13039/501100001711
ethz.grant.program
Ambizione
ethz.grant.program
Ambizione
ethz.date.deposited
2021-04-04T07:14:27Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Metadata only
en_US
ethz.rosetta.installDate
2021-04-16T14:11:15Z
ethz.rosetta.lastUpdated
2024-02-02T13:31:53Z
ethz.rosetta.versionExported
true
ethz.COinS
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