气候变化领域集成服务门户(CCPortal): Persistent, Depth-Intensified Mixing During The Western Mediterranean Transition's Initial Stages

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DOI	10.1029/2020JC016535
	Persistent, Depth-Intensified Mixing During The Western Mediterranean Transition's Initial Stages
	Piñeiro S.; González-Pola C.; Fernández-Díaz J.M.; Naveira-Garabato A.C.; Sánchez-Leal R.; Puig P.; Salat J.; Balbin R.
发表日期	2021
ISSN	21699275
卷号	126 期号:2
英文摘要	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. © 2020. American Geophysical Union. All Rights Reserved.
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186464
作者单位	Centro Oceanográfico de Baleares, Instituto Español de Oceanografía, Palma, Spain; Centro Oceanográfico de Gijón, Instituto Español de Oceanografía, Gijón, Spain; Department of Physics, Universidad de Oviedo, Oviedo, Spain; University of Southampton, National Oceanography Centre, Ocean and Earth Science, Southampton, United Kingdom; Centro Oceanográfico de Cádiz, Instituto Español de Oceanografía, Cádiz, Spain; Institut de Ciències del Mar, Consejo Superior de Investigaciones Científicas, Barcelona, Spain
推荐引用方式 GB/T 7714	Piñeiro S.,González-Pola C.,Fernández-Díaz J.M.,et al. Persistent, Depth-Intensified Mixing During The Western Mediterranean Transition's Initial Stages[J],2021,126(2).
APA	Piñeiro S..,González-Pola C..,Fernández-Díaz J.M..,Naveira-Garabato A.C..,Sánchez-Leal R..,...&Balbin R..(2021).Persistent, Depth-Intensified Mixing During The Western Mediterranean Transition's Initial Stages.Journal of Geophysical Research: Oceans,126(2).
MLA	Piñeiro S.,et al."Persistent, Depth-Intensified Mixing During The Western Mediterranean Transition's Initial Stages".Journal of Geophysical Research: Oceans 126.2(2021).