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Título:	Persistent, depth-intensified mixing during the Western Mediterranean Transition's initial stages
Autor:	Piñeiro, Safo; González-Pola, César; Fernández-Díaz, Julio Manuel; Naveira-Garabato, A.C.; Sánchez-Leal, Ricardo Félix; Puig, Pere CSIC ORCID; Salat, Jordi CSIC ORCID; Balbín, Rosa
Palabras clave:	Medio Marino Centro Oceanográfico de Baleares Western Mediterranean Transition Deep-ocean mixing Vertical diffusion Deep water renewal
Fecha de publicación:	18-feb-2021
Citación:	Journal of Geophysical Research-Oceans, 126. 2021: e2020JC016535-e2020JC016535
Resumen:	© 2020. American Geophysical Union. All Rights Reserved. Major deep-convection activity in the northwestern Mediterranean during winter 2005 triggered the formation of a complex anomalous deep-water structure that substantially modified the properties of the Western Mediterranean deep layers. Since then, evolution of this thermohaline structure, the so-called Western Mediterranean Transition (WMT), has been traced through a regularly sampled hydrographic deep station located on the outer continental slope of Minorca Island. A rapid erosion of the WMT's near-bottom thermohaline signal was observed during 2005–2007. The plausible interpretation of this as local bottom-intensified mixing motivates this study. Here, the evolution of the WMT structure through 2005–2007 is reproduced by means of a one-dimensional diffusion model including double-diffusive mixing that allows vertical variation of the background mixing coefficient and includes a source term to represent the lateral advection of deep-water injections from the convection area. Using an optimization algorithm, a best guess for the depth-dependent background mixing coefficient is obtained for the study period. WMT evolution during its initial stages is satisfactorily reproduced using this simple conceptual model, indicating that strong depth-intensified mixing (K ∞ (z) ≈ 22 × 10−4 m2 s−1; z ⪆ 1,400 dbar) is a valid explanation for the observations. Extensive hydrographic and current observations gathered over the continental slope of Minorca during winter 2018, the first deep-convective winter intensively sampled in the region, provide evidence of topographically localized enhanced mixing concurrent with newly formed dense waters flowing along-slope toward the Algerian sub-basin. This transport-related boundary mixing mechanism is suggested to be a plausible source of the water-mass transformations observed during the initial stages of the WMT off Minorca.
Descripción:	Piñeiro, S., González-Pola, C., Fernández-Díaz, J. M., Naveira-Garabato, A. C., Sánchez-Leal, R., Puig, P., et al. (2021). Persistent, depth-intensified mixing during the Western Mediterranean Transition's initial stages. Journal of Geophysical Research: Oceans, 126, e2020JC016535. https://doi.org/10.1029/2020JC016535. © 2020. American Geophysical Union. All Rights Reserved.
Versión del editor:	https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020JC016535
URI:	http://hdl.handle.net/10261/317860
DOI:	10.1029/2020JC016535
ISSN:	0148-0227
Aparece en las colecciones:	(IEO) Artículos