Fractionnement en oxygène 18 et en deutérium entre l’eau et sa vapeur

Majoube, M.

doi:10.1051/jcp/1971681423

Cited by 1,034 publications

(746 citation statements)

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“…In addition, the different impacts on δ 18 O and salinity that occur during sea-ice formation and melting can be used to investigate freshwater contributions from this source: while salinity responds strongly to brine rejection or freshwater addition, δ 18 O is only marginally affected by either process. Under equilibrium conditions, freezing produces sea ice with an isotopic signature that is only slightly heavier than the seawater from which it derives, with the fractionation factor being of the order of 1.0026-1.0035 [33,34]. Accordingly, concurrent measurements of δ 18 O and salinity at high latitudes are useful in discerning freshwater inputs of isotopically lighter meteoric sources from isotopically heavier sea-ice melt sources [30,35,36].…”

Section: Data and Methods (A) δ 18 O As A Freshwater Tracermentioning

confidence: 99%

Freshwater fluxes in the Weddell Gyre: results from δ ¹⁸ O

Brown

Meredith

Jullion

et al. 2014

Phil. Trans. R. Soc. A.

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Full-depth measurements of δ 18 O from 2008 to 2010 enclosing the Weddell Gyre in the Southern Ocean are used to investigate the regional freshwater budget. Using complementary salinity, nutrients and oxygen data, a four-component mass balance was applied to quantify the relative contributions of meteoric water (precipitation/glacial input), sea-ice melt and saline (oceanic) sources. Combination of freshwater fractions with velocity fields derived from a box inverse analysis enabled the estimation of gyre-scale budgets of both freshwater types, with deep water exports found to dominate the budget. Surface net sea-ice melt and meteoric contributions reach 1.8% and 3.2%, respectively, influenced by the summer sampling period, and −1.7% and +1.7% at depth, indicative of a dominance of sea-ice production over melt and a sizable contribution of shelf waters to deep water mass formation. A net meteoric water export of approximately 37 mSv is determined, commensurate with local estimates of ice sheet outflow and precipitation, and the Weddell Gyre is estimated to be a region of net sea-ice production. These results constitute the first synoptic benchmarking of sea-ice and meteoric exports from the Weddell Gyre, against which future change associated with an accelerating hydrological cycle, ocean climate change and evolving Antarctic glacial mass balance can be determined.

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Section: Data and Methods (A) δ 18 O As A Freshwater Tracermentioning

confidence: 99%

Freshwater fluxes in the Weddell Gyre: results from δ ¹⁸ O

Brown

Meredith

Jullion

et al. 2014

Phil. Trans. R. Soc. A.

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“…Bowen and Wilkinson's (2002) equation has an elevation factor and the value of 10 m was used to represent low elevation modern siderite values. The third modern trend was compiled from Holocene speleothem and meteoric calcite cement values over a broad range of latitudes (22°-65° latitude; Table 1 value of the air mass water vapor is recalculated (water vapor fractionation factors of Majoube, 1971) with the mass balance equation .…”

Section: Stable Isotopesmentioning

confidence: 99%

Precipitation rates and atmospheric heat transport during the Cenomanian greenhouse warming in North America: Estimates from a stable isotope mass-balance model

Ufnar

Ludvigson

González

et al. 2008

Palaeogeography, Palaeoclimatology, Palaeoecology

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Citation for published item:fn rD hF pF nd vudvigsonD qF eF nd qonz¡ lezD vF nd qr¤ o keD hF F @PHHVA 9 re ipit tion r tes nd tmospheri he t tr nsport during the genom ni n greenhouse w rming in xorth emeri X estim tes from st le isotope m ssE l n e modelF9D l eogeogr phyD p l eo lim tologyD p l eoe ologyFD PTT @IEPAF ppF PVEQVF Further information on publisher's website: httpsXGGdoiForgGIHFIHITGjFp l eoFPHHVFHQFHQQ Publisher's copyright statement: NOTICE: this is the author's version of a work that was accepted for publication in Palaeogeography, palaeoclimatology, palaeoecology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be re ected in this document. Changes may have been made to this work since it was submitted for publication. A de nitive version was subsequently published in Palaeogeography, palaeoclimatology, palaeoecology, 266, 1 2, 27 August 2008, 10.1016/j.palaeo.2008 Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details.

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“…Craig & Gordon 1965), and differ from the values presented by Merlivat (1978).] The term e eq was calculated from the ) e e equations of Majoube (1971 ). For the term a kb , diffusion through the boundary layer, the value a k 2/3 was used (Flanagan et al 1991).…”

Section: Assessing the Péclet Effectmentioning

confidence: 99%