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dc.contributor.authorMacGilchrist, G. A.
dc.contributor.authorJohnson, H. L.
dc.contributor.authorLique, C.
dc.contributor.authorMarshall, D. P.
dc.identifier.citationMacGilchrist , G A , Johnson , H L , Lique , C & Marshall , D P 2021 , ' Demons in the North Atlantic : variability of deep ocean ventilation ' , Geophysical Research Letters , vol. 48 , no. 9 , e2020GL092340 .
dc.identifier.otherORCID: /0000-0003-1409-8937/work/121754025
dc.descriptionG. A. MacGilchrist is supported through NSF’s Southern Ocean Carbon and Climate Observations and Modeling (SOCCOM) Project under the NSF Award PLR-1425989, with additional support from NOAA and NASA. HJ and DM were supported by the UK Natural Environment Research Council OSNAP project (NE/K010948/1). C. Lique was supported by the project MEDLEY funded by JPI Climate and JPI Oceans, under the agreement ANR-19-JPOC-0001. The hindcast was carried out within the European Drakkar project.en
dc.description.abstractTranslation of atmospheric forcing variability into the ocean interior via ocean ventilation is an important aspect of transient climate change. On a seasonal timescale in the subtropics, this translation is mediated by a so-called "Demon" that prevents access to all except late-winter mixed-layer water. Here, we use an eddy-permitting numerical circulation model to investigate a similar process operating on longer (interannual) timescales in the subpolar North Atlantic. We find that variations in atmospheric forcing are mediated in their translation to the ocean interior, with year-to-year changes in the late-winter mixed layer depth being the critical factor. The signature of persistent strong atmospheric forcing driving deep mixed layers is preferentially ventilated to the interior when the forcing is ceased. Susceptibility to this effect depends on the location and density of subduction-with the rate at which newly ventilated water escapes its region of subduction being the crucial factor.
dc.relation.ispartofGeophysical Research Lettersen
dc.subjectDense water formationen
dc.subjectLabrador Seaen
dc.subjectNorth Atlanticen
dc.subjectOcean mixed layeren
dc.subjectOcean ventilationen
dc.subjectGE Environmental Sciencesen
dc.subjectSDG 13 - Climate Actionen
dc.titleDemons in the North Atlantic : variability of deep ocean ventilationen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews. School of Earth & Environmental Sciencesen
dc.description.statusPeer revieweden

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