Search

Your search keyword '"R. Somavilla"' showing total 4 results
Start Over Author "R. Somavilla" Topic bay
4 results on '"R. Somavilla"'

1. Temperature and salinity variability in the south-eastern corner of the Bay of Biscay (NE Atlantic)

Author

R. Somavilla, C. Rodríguez, César González-Pola, and Alicia Lavín

Subjects
Work (thermodynamics), Advection, Mixed layer, Temperature salinity diagrams, Aquatic Science, Oceanography, Salinity, Heat exchanger, Environmental science, Medio Marino, Entrainment (chronobiology), Bay, Centro Oceanográfico de Gijón, Ecology, Evolution, Behavior and Systematics
Abstract

Temperature- and salinity-balance equations together with a one-dimensional model are used in this work to investigate the governing processes of the surface temperature and salinity variability at low and high frequencies in the southern Bay of Biscay. We found that the temporal evolution of mixed layer temperature is dominated by its seasonal cycle, mostly explained through a vertical balance (80–90%) that is mostly driven by air–sea heat exchange and contributed by entrainment, while horizontal advection plays a secondary role (≤ 12%). A substantial imbalance can be noticed in spring, which surprisingly strongly diminishes from 2003 onward, coinciding with apparent shifts in surface heat flow. The uncertainties of the air–sea heat fluxes and the advective and entrainment terms seem to be responsible for the imbalance of the temperature budget. On the contrary, the interannual variability dominates over the seasonal cycle of mixed layer salinity, and advection accounts for more than 70% of the budget terms, with the sum of vertical processes playing a secondary role. The different contributions of air–sea exchanges on temperature and salinity (heat vs. freshwater) are the ultimate cause of the different patterns observed for both of the parameters.

Published
2013
Full Text
View/download PDF

2. Freshwater from the Bay of Biscay shelves in 2009

Author

Jacqueline Boutin, A. Lavin, C. Rodríguez, Pascal Lazure, Antonio Lourenço, J. Rolland, Fabienne Gaillard, Gilles Reverdin, Stéphanie Louazel, Anna Rubio, Pierre Testor, Francois Batifoulier, Louis Marié, Francesco d'Ovidio, Julien Mader, Yves Bozec, Jérôme Chanut, Guillaume Charria, Nicolas Martin, Pierre Blouch, Franck Dumas, R. Somavilla, Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN), Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Couplage physique-biogéochimie-carbone (PHYBIOCAR), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), Échanges dans la couche de surface : des pôles aux tropiques (SURF), Développement Instrumental et Techniques Marines (DITM), CHImie Marine (CHIM), Adaptation et diversité en milieu marin (AD2M), Station biologique de Roscoff [Roscoff] (SBR), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Station biologique de Roscoff [Roscoff] (SBR), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique hydrodynamique et sédimentaire (DYNECO/PHYSED), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Centre Militaire d'Océanographie, Service Hydrographique et Océanographique de la Marine (SHOM), Ministère de la Défense-Ministère de la Défense, Mercator Océan, Société Civile CNRS Ifremer IRD Météo-France SHOM, Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique hydrodynamique et sédimentaire (PHYSED), Dynamiques des Écosystèmes Côtiers (DYNECO), and Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)

Subjects
0106 biological sciences, Salinity, Centro Oceanográfico de Santander, 010504 meteorology & atmospheric sciences, [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph], [SDE.MCG]Environmental Sciences/Global Changes, [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph], Aquatic Science, Oceanography, 01 natural sciences, Deep sea, Cape, 14. Life underwater, Altimeter, Medio Marino, Ecology, Evolution, Behavior and Systematics, 0105 earth and related environmental sciences, Canyon, geography, geography.geographical_feature_category, Plateau, Cross-slope exchanges, Continental shelf, 010604 marine biology & hydrobiology, 6. Clean water, Shelf circulation, Ocean monitoring, Bay, Geology
Abstract

In April – November 2009, surface salinity data provide a good coverage of most of the south-east Bay of Biscay and nearby Aquitaine/Armorican shelves. By late April most of the shelf, in particular south of 46°N, is covered by a fresh surface layer amounting to a fresh water volume of 49·10 9 m 3 . At that time, a moderate amount of fresh water has spread over the Landes Plateau. By mid-June, this shelf water penetrates over the Cape Ferret Canyon north of the Landes Plateau. By mid-July, it is found west of the Landes Plateau to at least 4°W, with an estimated fresh-water content of 11 – 14·10 9 m 3 . Drifters deployed on June 17 in the Cape Ferret Canyon, or later on the shelves, con fi rm the spreading of shelf fresh-water over the deep ocean. Lagrangian tracking using altimetric products, also con fi rms the transport by a quasi-stationary circulation. Operational numerical simula- tions (PREVIMER, IBI, HYCOM) display this spread of the freshwater, but in different areas. In particular, all have some fresh water escaping westward near the coast in the Basque region, which is not observed. Later in the summer season, the fresh water spreads westward to south-westward and along the shelf break to at least 5.5°W in late September.

Published
2013
Full Text
View/download PDF

3. Large changes in the hydrographic structure of the Bay of Biscay after the extreme mixing of winter 2005

Author

Simon A. Josey, C. Rodríguez, R. Somavilla, César González-Pola, Ricardo Sánchez, and Alicia Lavín

Subjects
Atmospheric Science, Centro Oceanográfico de Santander, Mixed layer, Soil Science, Stratification (water), Aquatic Science, Oceanography, Water column, Geochemistry and Petrology, Earth and Planetary Sciences (miscellaneous), Marine ecosystem, Medio Marino, Earth-Surface Processes, Water Science and Technology, Isopycnal, Ecology, Paleontology, Forestry, Geophysics, Space and Planetary Science, Climatology, Hydrography, Thermocline, Bay, Geology
Abstract

The extremely cold and dry winter of 2005 in southwestern Europe caused a profound transformation of the upper ocean hydrographic structure of the Bay of Biscay area, making it completely different from the previous decade. The strong local winter cooling resulted in the highest density flux estimated since the 1960s. The extreme buoyancy loss triggered the mixed layer to reach unprecedented depths affecting directly the level of local modal waters that are usually unconnected to air-sea interaction. The water column just below the climatological average mixed layer entered in a process of quick cooling that compensated in 2 years the 0.5°C gained in the period 1994–2004. Enhanced by a pronounced precipitation deficit the event caused concurrently a downward salt injection that made deeper levels of East North Atlantic Central Water begin a process of warming by isopycnal change, something never observed during the 1990s. As an overall result, the stratification of the upper permanent thermocline was dramatically reduced. The observed cold low stratification anomaly had a substantial spatial extent and remained for 2 years below the seasonal thermocline development, constituting a typical case of the reemergence mechanism, but was abruptly interrupted in the warmest winter on record of 2007. In addition to the hydrographic changes, the winter 2005 event had a notable effect on the marine ecosystem., Sí

Published
2009
Full Text
View/download PDF

4. The Spanish Institute of Oceanography (IEO) Coastal Observing System at the southern Bay of Biscay, new real-time development: The ocean-meteorological AGL Buoy

Author

M. Ruiz-Villareal, R. Somavilla, A. Lavin, C. Rodríguez, D. Cano, J.L. Arteche, and IEEE

Subjects
Sea surface temperature, Oceanography, Mediterranean sea, Buoy, Climatology, Ocean chemistry, Ocean current, Labrador Sea Water, Hydrography, Bay, Geology
Abstract

From 1991, shelf and slope waters of the Southern Bay of Biscay are regularly sampled in a monthly hydrographical line north of Santander to a maximum depth of 1000m, as part of the IEO Radiales project. From 2003, a deep hydrological standard sections (part of the VACLAN project) is occupied twice a year extending the Santander section 90 miles offshore. Measurements include CTDO2, nutrients and currents from vessel-mounted ADCP and LADCP. The data base in the area hold by IEO is complemented with a current meters line moored in 2003 at 43deg48'N, 3deg 47'W sampling temperature, salinity and currents at the core of Central, Mediterranean and Labrador Sea water. On June 2007, an ocean-meteorological Buoy was moored at the Santander Section, 22 miles north of Santander at about 2850m depth, to complete the ocean information with the ocean-atmosphere interaction. The Santander section and AGL Buoy data highlight that heat and salt show a quite different behaviour in terms of their balance in the upper layers of the Bay of Biscay. At interannual and seasonal timescales temperature is mainly determined by the atmospheric forcing while salinity is more closely linked to advection processes. Finally, a severe storm developed in the Bay of Biscay on January 24, 2009 is described. The AGL buoy registered an individual maximum wave of 26.1m, the largest ever recorded by the Spanish buoy Networks.

Published
2009

Catalog

Books, media, physical & digital resources
See catalog results