A Numerical Study of the Effects of Coastline Geometry on Wind-Induced Upwelling in the Gulf of Lions

Hua, Bach Lien; Thomasset, François

doi:10.1175/1520-0485(1983)013<0678:ansote>2.0.co;2

Cited by 31 publications

(22 citation statements)

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“…Millot (1979Millot ( , 1990 listed six different cells commonly observed by satellite data in the GoL, which appear during continental winds (Mistral or Tramontane). Using a twolayer model, Hua and Thomasset (1983) were able to relate the different cell locations to the specific geometry of the coastline. The upwelling cells in the eastern and the northern GoL were shown to be the consequence of the favorable direction of the Mistral and the Tramontane, respectively.…”

Section: Upwellingsmentioning

confidence: 99%

“…On the north-western coast, the Valras upwelling is present on the satellite image, including an elongated feature resembling a southward filament, associated with a patch of warmer water in the south (3.25°E, 42.9 N). Hua and Thomasset (1983) suggested that the elongation of the upwelling was associated with an anticyclonic eddy in the western part of the GoL. However, they were not able to reproduce such a feature through their idealized modeling and pointed out the lack of spatial and temporal variability in the applied wind stress.…”

Section: Upwellingsmentioning

confidence: 99%

“…Accordingly, the main hydrodynamic features of the GoL result from interactions with the atmosphere: summer up-and downwellings (Hua and Thomasset 1983;Millot 1979), inertial oscillations (Petrenko 2003;Millot and Crepon 1981), dense water formation and cascading in winter (Ulses et al 2008;Béranger et al 2010), and mesoscale eddy activity (Rubio et al 2009a;Hu et al 2009;Allou et al 2010;Garreau et al 2011).…”

Section: Introductionmentioning

confidence: 99%

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Influence of high-resolution wind forcing on hydrodynamic modeling of the Gulf of Lions

Schaeffer

Garreau²,

Molcard³

et al. 2011

Ocean Dynamics

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The impact of the choice of high-resolution atmospheric forcing on ocean summertime circulation in the Gulf of Lions (GoL; Mediterranean Sea) is evaluated using three different datasets: AROME (2.5 km, 1 h), ALADIN (9.5 km, 3 h), and MM5 (9 km, 3 h). A shortterm ocean simulation covering a 3-month summer period was performed on a 400-m configuration of the GoL. The main regional features of both wind and oceanic dynamics were well-reproduced by all three atmospheric models. Yet, at smaller scales and for specific hydrodynamic processes, some differences became apparent. Inertial oscillations and mesoscale variability were accentuated when highresolution forcing was used. Sensitivity tests suggest a predominant role for spatial rather than temporal resolution of wind. The determinant influence of wind stress curl was evidenced, both in the representation of a mesoscale eddy structure and in the generation of a specific upwelling cell in the north-western part of the gulf.

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Section: Upwellingsmentioning

confidence: 99%

Section: Upwellingsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of high-resolution wind forcing on hydrodynamic modeling of the Gulf of Lions

Schaeffer

Garreau²,

Molcard³

et al. 2011

Ocean Dynamics

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“…The westward drift of the maturing food chain may favour higher trophic level organisms, suitable to sperm whale feeding, in the Gulf of Lions. Furthermore, northwesterly wind gales are common in the Gulf of Lions, even during summer, which generate coastal upwelling in this area (Hua & Thomasset 1983, Johns et al 1992, as well as vertical mixing linked to the complex canyon topography. Hence, several factors might contribute to high sperm whale abundance in this part of the western basin.…”

Section: Regional Variation In Sperm Whale Relative Abundancementioning

confidence: 99%

Distribution and relative abundance of sperm whales in the Mediterranean Sea

Gannier¹,

Drouot²,

Goold³

2002

Mar. Ecol. Prog. Ser.

104

132

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“…The SCD values range from −1.10 −4 s −1 to 1.10 −4 s −1 . A strong upwelling activity has been already reported in this region (Hua and Thomasset 1983;Millot 1990). Figure 3c shows the norm of the vector speed difference, VSD, between the VRM (u VRM , v VRM ) and the original (u, v) current fields according to:…”

Section: Vectorial Reconstruction Methods In the Gulf Of Lionsmentioning

confidence: 99%

Characterization of ocean surface current properties from single site HF/VHF radar

2011

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Surface current mapping from HF/VHF coastal radars traditionally requires at least two distant sites. Vector velocities are estimated by combining the radial velocity components measured by the radars. In many circumstances (e.g., failures, interferences, logistics constraints), such a combination is not possible by lack of data from one station. Two methods are evaluated to get information on surface circulation from a single site radar: the Vectorial Reconstruction Method (VRM) for current vector mapping and the Vortex Identification Method (VIM) for detecting eddy-like structures. The VRM assumes a non-divergent horizontal surface current, and the VIM analyzes radial velocities and their radial and orthoradial gradients. These two methods are tested on modeled and measured data sets in the Northwestern Mediterranean Sea where both high-resolution ocean circulation model and radar campaigns are available. The VRM performance is strongly limited by the divergence-free hypothesis which was not satisfied in our real data. The VIM succeeded in detection of vortex in the Gulf of Lions and from an operating single site radar located on the Provence coasts in summer

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A Numerical Study of the Effects of Coastline Geometry on Wind-Induced Upwelling in the Gulf of Lions

Cited by 31 publications

References 0 publications

Influence of high-resolution wind forcing on hydrodynamic modeling of the Gulf of Lions

Influence of high-resolution wind forcing on hydrodynamic modeling of the Gulf of Lions

Distribution and relative abundance of sperm whales in the Mediterranean Sea

Characterization of ocean surface current properties from single site HF/VHF radar

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