Mesoscale subduction at the Almeria–Oran front

Allen, John T.; Smeed, David A.; Tintoré, Joaquı́n; Ruiz, Simón

doi:10.1016/s0924-7963(01)00062-8

Cited by 62 publications

(66 citation statements)

References 46 publications

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“…This large structure had associated vertical velocities (diagnosed using the Omega equation) of ~1 m day -1 (Ruiz et al 2009c), which is in agreement with previous studies in the area for similar-sized eddies (Tintoré et al 1991). For smaller-sized structures visible in the analysis (eddy diameter <100 km), vertical velocities can reach values of about 40 to 50 m day -1 (Gomis et al 2001, Allen et al 2001). …”

Section: Mesoscale and Sub-mesoscale Processes: Physical And Biogeochsupporting

confidence: 90%

New technologies for marine research: five years of glider activities at IMEDEA

Ruiz¹,

Garau²,

Martínez-Ledesma³

et al. 2012

Sci. Mar.

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SUMMARY: This paper summarizes the glider activities carried out in the last 5 years by the IMEDEA Department of Marine Technologies, Operational Oceanography and Sustainability (TMOOS). TMOOS has been operating gliders in the Western Mediterranean Sea since 2006 and has set-up electronic and maintenance laboratories in order to establish a key glider port in the area. Twenty-two glider missions have been performed to date and over 17000 hydrographic and biogeochemical profiles collected. TMOOS is using gliders for operational, technological and scientific objectives. Studies of path planning analysis and adaptive sampling for gliders in combination with other platforms have been undertaken and new methodologies have been developed to process data from gliders. Thus far, IMEDEA gliders have contributed to the better understanding of mesoscale processes in the upper ocean, including the coupling between the physical and biogeochemical process of the marine ecosystem and, in combination with remote sensing observations, high-resolution glider data has enabled advances in new methodologies to improve coastal altimetry. Gliders have also proved to be important platforms for the development of operational oceanography tools and useful vehicles on which to test and implement new sensors for ocean monitoring.Keywords: Autonomous underwater vehicles, ocean observing system, upper ocean mesoscale processes, Balearic Sea. RESUMEN: Nuevas tecNologías para la iNvestigacióN mariNa: 5 años de actividades de gliders eN el imedea.-Este artículo resume las actividades de gliders llevadas a cabo en los últimos 5 años en el Departamento de Tecnologías Marinas, Oceanografía Operacional y Sostenibilidad (TMOOS) del IMEDEA. El departamento TMOOS realiza misiones con gliders en el Mediterráneo occidental desde el año 2006. Se han creado nuevos laboratorios de electrónica y de mantenimiento con el fin de establecer un 'glider-port' clave en esta zona del Mediterráneo. Se han realizado veintidos misiones que han supuesto la adquisición de un total de 17.000 perfiles hidrográficos y biogeoquímicos. El TMOOS usa los planeadores submarinos con fines operacionales, tecnológicos y científicos. Se han realizado estudios sobre planificación de rutas y muestreo adaptativo de gliders en combinación con otras plataformas y se han desarrollado nuevas metodologías para el procesado de los datos. Los planeadores han contribuido a una mejor comprensión de los procesos de mesoescala de la capa superficial del océano, incluyendo el acoplamiento de procesos físicos y bio-geoquímicos de los ecosistemas marinos. Combinando observaciones de alta resolución de gliders y de satélites se ha avanzado en el desarrollo de nuevas metodologías para mejorar la altimetría costera. Además, los planeadores también han demostrado ser una plataforma ideal para la oceanografía operacional y en la que se pueden probar e implementar nuevos sensores para la monitorización de los océanos.Palabras clave: vehículos autónomos submarinos, sistemas observación océano, procesos me...

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Section: Mesoscale and Sub-mesoscale Processes: Physical And Biogeochsupporting

confidence: 90%

New technologies for marine research: five years of glider activities at IMEDEA

Ruiz¹,

Garau²,

Martínez-Ledesma³

et al. 2012

Sci. Mar.

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“…Across a frontal zone, it is in the pycnocline where we expect the most effective isopycnal transport to occur. It is therefore intuitive to map physical and biological properties on the 27.75 σ 0 surface if our goal is to look at transports driven by instability (Allen et al 2001a;Allen et al 2005) (Fig. 5) rather than the contrast between large-scale water masses (Allen and Smeed 1996).…”

Section: Observational Analysesmentioning

confidence: 99%

“…If we were to assume that phytoplankton can be considered passive with respect to the three-dimensional fluid motions (Fielding et al 2001), then it is instructive to look at proxies for the observation of phytoplankton on isopycnal surfaces (Allen et al 2001a). Mapping fluorescence yield on the 27.75 σ 0 surface (Fig.…”

Section: Observational Analysesmentioning

confidence: 99%

Marine algae are ‘taught’ the basics of angular momentum

Allen

2017

Ocean Dynamics

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Advanced modelling studies and high-resolution observations have shown that flows related to instability of the mesoscale (~1-10 km scale) may provide both the fertilisation mechanism for nutrient-depleted (oligotrophic) surface waters and a subduction mechanism for the rapid export of phytoplankton biomass to the deep ocean. Here, a detailed multidisciplinary analysis of the data from an example high-resolution observational campaign is presented. The data provide direct observations of the transport of phytoplankton through baroclinic instability. Furthermore, the data confirm that this transport is constrained by the requirement to conserve angular momentum, expressed in a stratified water column as the conservation of potential vorticity. This constraint is clearly seen to produce long thin filaments of phytoplankton populations strained out along isopycnal vorticity annuli associated with mesoscale frontal instabilities.

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“…As illustrated in Figure 1, such a few-weeks period roughly corresponds to the time an eddy is over the mooring. In addition to the fact that these values are O(100) times larger than the mesoscale subduction velocities in near-surface layers [Allen et al, 2001], it must be emphasised that they are observed in the deep (2000 -2400 m).…”

Section: Resultsmentioning

confidence: 96%

Fast deep sinking in Mediterranean eddies

Haren¹,

Millot²,

Taupier‐Letage³

2006

Geophysical Research Letters

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[1] Large (up to 0.03 m s À1 ) downward vertical water velocities (w) are observed using yearlong moored ADCP at $2400 m in the deep Mediterranean Sea's Algerian basin. Once every 2 -3 months, jwj rapidly increases to O(0.01 ± 0.002 m s À1 ) before slowly decreasing during a few weeks, in association with the passage of mesoscale eddies formed nearby. These amplitudes of negative w are O(100) times larger than those commonly linked to mesoscale eddies near the surface (subduction), and O(10) times larger than settling velocities for marine snow. Our observations suggest that mesoscale eddies, which are important for biological productivity near the surface, can also convect nearly fresh material down to the bottom ($3000 m there) within a few days. Citation: van Haren, H., C. Millot, and I. Taupier-Letage (2006), Fast deep sinking in Mediterranean eddies, Geophys. Res. Lett., 33, L04606,

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Mesoscale subduction at the Almeria–Oran front

Cited by 62 publications

References 46 publications

New technologies for marine research: five years of glider activities at IMEDEA

New technologies for marine research: five years of glider activities at IMEDEA

Marine algae are ‘taught’ the basics of angular momentum

Fast deep sinking in Mediterranean eddies

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