Low‐frequency waves in the Ligurian Sea during December 1977

Crépon, Michel; Wald, Lucien; Monget, Jean‐Marie

doi:10.1029/jc087ic01p00595

Cited by 78 publications

(43 citation statements)

References 4 publications

(4 reference statements)

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“…The meander length scales are in good agreement with those of previous satellite observations. However, phase velocities of the instabilities are slower than those inferred from observations (Crépon et al, 1982, Flexas et al, 2002. The mesoscale circulation is very intense in the Catalannorth Balearic Sea.…”

Section: Discussionmentioning

confidence: 67%

“…9a and b is ∼3-5 cm/s. This value is low compared with that inferred from early winter observations of sea-surface temperature (SST; Crépon et al, 1982) and velocity measurements (Flexas et al, 2002). However, the phase speed of the baroclinic waves is very sensitive to the vertical velocity shear (Tang, 1975) and to the model's vertical discretisation (Griffiths et al, 2000).…”

Section: The Gulf Of Lions (93mentioning

confidence: 57%

“…9). This range of spatial scales has been observed by Crépon et al (1982) in the Ligurian Sea and by Flexas et al (2002) in the Gulf of Lions. The phase velocity estimated from Figs.…”

Section: The Gulf Of Lions (93mentioning

confidence: 73%

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Simulation and analysis of the mesoscale circulation in the northwestern Mediterranean Sea

Échevin¹,

Crépon²,

Mortier³

2003

Ann. Geophys.

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Abstract. The large-scale and mesoscale circulation of the northwestern Mediterranean Sea are simulated with an eddyresolving primitive-equation regional model (RM) of 1/16 • resolution embedded in a general circulation model (GM) of the Mediterranean Sea of 1/8 • resolution. The RM is forced by a monthly climatology of heat fluxes, precipitation and wind stress. The GM, which uses the same atmospheric forcing, provides initial and boundary conditions for the RM.Analysis of the RM results shows that several realistic features of the large-scale and mesoscale circulation are evident in this region. The mean cyclonic circulation is in good agreement with observations. Mesoscale variability is intense along the coasts of Sardinia and Corsica, in the Gulf of Lions and in the Catalan Sea. The length scales of the Northern Current meanders along the Provence coast and in the Gulf of Lions' shelf are in good agreement with observations. Winter Intermediate Water is formed along most of the north-coast shelves, between the Gulf of Genoa and Cape Creus. Advection of this water by the mean cyclonic circulation generates a complex eddy field in the Catalan Sea. Intense anticyclonic eddies are generated northeast of the Balearic Islands. These results are in good agreement with mesoscale activity inferred from satellite altimetric data. This work demonstrates the feasibility of a downscaling system composed of a general-circulation, a regional and a coastal model, which is one of the goals of the Mediterranean Forecasting System Pilot Project.

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Section: Discussionmentioning

confidence: 67%

Section: The Gulf Of Lions (93mentioning

confidence: 57%

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Simulation and analysis of the mesoscale circulation in the northwestern Mediterranean Sea

Échevin¹,

Crépon²,

Mortier³

2003

Ann. Geophys.

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“…Millot (1990); Estournel et al (2003);Petrenko (2003) and review paper Millot (1999). In the winter, the LPC has been shown to be baroclinically unstable, with rapid variations in its position: the periods are of a few days to 20 days (Crépon et al, 1982). All these processes imply that a correct modeling of the GoL requires to take into account all scales, from small to large, in a full 3-D model.…”

Section: Study Areamentioning

confidence: 99%

Study of the combined effects of data assimilation and grid nesting in ocean models – application to the Gulf of Lions

Vandenbulcke¹,

Barth

Rixen

et al. 2006

Ocean Sci.

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Abstract. Modern operational ocean forecasting systems routinely use data assimilation techniques in order to take observations into account in the hydrodynamic model. Moreover, as end users require higher and higher resolution predictions, especially in coastal zones, it is now common to run nested models, where the coastal model gets its opensea boundary conditions from a low-resolution global model. This configuration is used in the "Mediterranean Forecasting System: Towards environmental predictions" (MFSTEP) project. A global model covering the whole Mediterranean Sea is run weekly, performing 1 week of hindcast and a 10-day forecast. Regional models, using different codes and covering different areas, then use this forecast to implement boundary conditions. Local models in turn use the regional model forecasts for their own boundary conditions. This nested system has proven to be a viable and efficient system to achieve high-resolution weekly forecasts. However, when observations are available in some coastal zone, it remains unclear whether it is better to assimilate them in the global or local model. We perform twin experiments and assimilate observations in the global or in the local model, or in both of them together. We show that, when interested in the local models forecast and provided the global model fields are approximately correct, the best results are obtained when assimilating observations in the local model.

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“…The detection principle is based on the collection of Cherenkov photons induced by relativistic charged particles, produced in neutrino interactions, using a 3D-array of about 900 Photo-Multiplier Tubes (PMTs) sensitive to single photo-electrons (Amram et al, 2002). Each PMT together with electronics is One of potential processes is the Northern Current (NC; Millot, 1999), which flows counter-clockwise along the boundary slopes of the Ligurian and Provençal subbasins and which is driven by buoyancy forces affected by rotation (Crépon et al, 1982;1989). It is a few tens of km wide and it shows a marked seasonal variability.…”

Section: Introductionmentioning

confidence: 99%

Acoustic and optical variations during rapid downward motion episodes in the deep north-western Mediterranean Sea

Haren

Taupier‐Letage

Aguilar

et al. 2011

Deep Sea Research Part I: Oceanographic Research Papers

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Low‐frequency waves in the Ligurian Sea during December 1977

Cited by 78 publications

References 4 publications

Simulation and analysis of the mesoscale circulation in the northwestern Mediterranean Sea

Simulation and analysis of the mesoscale circulation in the northwestern Mediterranean Sea

Study of the combined effects of data assimilation and grid nesting in ocean models – application to the Gulf of Lions

Acoustic and optical variations during rapid downward motion episodes in the deep north-western Mediterranean Sea

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