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dc.contributor.authorZannoni, Daniele
dc.contributor.authorSteen-Larsen, Hans Christian
dc.contributor.authorPeters, A.J.
dc.contributor.authorWahl, Sonja
dc.contributor.authorSodemann, Harald
dc.contributor.authorSveinbjörnsdóttir, A.E.
dc.date.accessioned2022-12-14T14:58:30Z
dc.date.available2022-12-14T14:58:30Z
dc.date.created2022-11-30T15:10:05Z
dc.date.issued2022
dc.identifier.issn2169-897X
dc.identifier.urihttps://hdl.handle.net/11250/3037770
dc.description.abstractOcean isotopic evaporation models, such as the Craig-Gordon model, rely on the description of nonequilibrium fractionation factors that are, in general, poorly constrained. To date, only a few gradient-diffusion type measurements have been performed in ocean settings to test the validity of the commonly used parametrization of nonequilibrium isotopic fractionation during ocean evaporation. In this work, we present 6 months of water vapor isotopic observations collected from a meteorological tower located in the northwest Atlantic Ocean (Bermuda) with the objective of estimating nonequilibrium fractionation factors (k, ‰) for ocean evaporation and their wind speed dependency. The Keeling Plot method and Craig-Gordon model combination were sensitive enough to resolve nonequilibrium fractionation factors during evaporation resulting into mean values of k18 = 5.2 ± 0.6‰ and k2 = 4.3 ± 3.4‰. Furthermore, we evaluate the relationship between k and 10-m wind speed over the ocean. Such a relationship is expected from current evaporation theory and from laboratory experiments made in the 1970s, but observational evidence is lacking. We show that (a) in the observed wind speed range [0–10 m s−1], the sensitivity of k to wind speed is small, in the order of −0.2‰ m−1 s for k18, and (b) there is no empirical evidence for the presence of a discontinuity between smooth and rough wind speed regime during isotopic fractionation, as proposed in earlier studies. The water vapor d-excess variability predicted under the closure assumption using the k values estimated in this study is in agreement with observations over the Atlantic Ocean.en_US
dc.language.isoengen_US
dc.publisherAmerican Geophysical Unionen_US
dc.rightsNavngivelse 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/deed.no*
dc.titleNon-Equilibrium Fractionation Factors for D/H and 18O/16O During Oceanic Evaporation in the North-West Atlantic Regionen_US
dc.typeJournal articleen_US
dc.typePeer revieweden_US
dc.description.versionpublishedVersionen_US
dc.rights.holderCopyright 2022 the authorsen_US
dc.source.articlenumbere2022JD037076en_US
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode2
dc.identifier.doi10.1029/2022JD037076
dc.identifier.cristin2086017
dc.source.journalJournal of Geophysical Research (JGR): Atmospheresen_US
dc.identifier.citationJournal of Geophysical Research (JGR): Atmospheres. 2022, 127 (21), e2022JD037076.en_US
dc.source.volume127en_US
dc.source.issue21en_US


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Navngivelse 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Navngivelse 4.0 Internasjonal