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Impact of an intrusion by the Northern Current on the biogeochemistry in the eastern Gulf of Lion, NW Mediterranean ArchiMer
Ross, Oliver N.; Fraysse, Marion; Pinazo, Christel; Pairaud, Ivane.
We present the results from the RHOMA2011-LEG2 campaign that took place in the eastern Gulf of Lion from 7 to 17 Oct 2011 and combine them with remote sensing observations and results from a 3D coupled hydrodynamic-biogeochemical model to study an intrusion event of the Northern Current (NC) onto the continental shelf in the Gulf of Lion (NW Mediterranean). Our analysis shows that during the intrusion, the previously upwelled nutrient-rich water present on the shelf is replaced by warmer and mostly oligotrophic NC water within a matter of 2–3 days. This has a marked impact on the local biogeochemistry in the Gulf with pre-intrusion Chl-a concentrations in the surface layer of over 0.5 mg m−3 dropping to near the detection limit within less than 72 h. The...
Tipo: Text Palavras-chave: Northern Current; Gulf of Lion; Intrusion; Continental shelf; Biogeochemical modelling; Regime shift.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00302/41359/40644.pdf
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Mesoscale slope current variability in the Gulf of Lions. Interpretation of in-situ measurements using a three-dimensional model ArchiMer
Andre, Gael; Garreau, Pierre; Fraunie, Philippe.
The ECOLOPHY experiments aimed at investigating physical exchanges between coastal and open sea. They were carried out in June and December 2005 over the shelf-break in the North-eastern part of the Gulf of Lions (Northwestern Mediterranean Sea). This area is considered to be the generation zone for the eddy and meandering structures of the Northern Current (NC). The objective of the present work is to examine mesoscale variability of this coastal slope current in the light of available data. Numerical modeling is used to support the field data analysis. ADCP current measurements over a one-year period show that mesoscale activity is maximal in late winter, correlating with the seasonal variability of the NC and, also, partly with local winds, Measured...
Tipo: Text Palavras-chave: Numerical modeling; Mesoscale variability; Slope Current; Northern Current; Gulf of Lions; Northwestern Mediterranean Sea.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6461.pdf
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The penetration of the Northern Current over the Gulf of Lions (Mediterranean) as a downscaling problem ArchiMer
Auclair, F; Marsaleix, P; Estournel, C.
Coastal shelf models suffer from the difficulty of specifying both the initial field and the external circulation at the open boundary. Only basin scale models can have the right space-time variability to routinely provide such information. Do facto, such models have however a coarser resolution than the coastal model and the downscaling of the circulation to the high resolution grid is biased. Indeed the models are not necessarily based on the same physics and the interactions of the general circulation with the topography, in particular over the shelf break region, arc generally not correctly represented on the large-scale grid. Studying the response of the Northern Current to the atmospheric forcing in the region of Marseille (France) and its...
Tipo: Text Palavras-chave: Courant Nord; Golfe du Lion; Initialisation variationnelle; Cascade d’échelles; Talus continental; Northern Current; Gulf of Lions; Variational initialization; Downscaling; Continental shelf break.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/00322/43330/42897.pdf
Registros recuperados: 3
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