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3. Effect of circulation at early life stages of European anchovy in the Bay of Biscay from observational data and a Lagrangian approach

Author

Eusko Jaurlaritza, European Commission, Ministerio de Ciencia e Innovación (España), Manso-Narvarte, Ivan, Caballero, Ainhoa, Hernández-Carrasco, Ismael, Orfila, Alejandro, Santos Mocoroa, María, Cotano, Unai, Jordá, Gabriel, Declerck, Amandine, Delpey, Matthias, Rubio, Anna, Eusko Jaurlaritza, European Commission, Ministerio de Ciencia e Innovación (España), Manso-Narvarte, Ivan, Caballero, Ainhoa, Hernández-Carrasco, Ismael, Orfila, Alejandro, Santos Mocoroa, María, Cotano, Unai, Jordá, Gabriel, Declerck, Amandine, Delpey, Matthias, and Rubio, Anna

Abstract

Coastal circulation influences the distribution of European anchovy (Engraulis encrasicolus) at early life stages (ELS) in the Bay of Biscay (BoB). However, how this happens is not yet fully understood. In this work, further insight is provided by performing Lagrangian diagnostics based on observations of ELS anchovies' initial distributions and currents. Surface diagnostics were obtained by using high-frequency radar (HFR) currents and were applied to analyse multiyear variability and detect the coastal processes that affect the distribution. Since ELS anchovies are also located at subsurface levels, subsurface diagnostics were obtained by using currents reconstructed from HFR and ADCP observations with a reduced order optimal interpolation (ROOI) method. The analyses included transport computations as well as the analysis of flow properties by Lagrangian Coherent Structures and chlorophyll-a satellite images. Results suggest that ELS anchovies are mostly retained over the shelf and slope, and that transport patterns highly vary across different periods. Mesoscale structures such as eddies, fronts and along-slope currents within the slope and the Capbreton canyon area, as well as strong and persistent winds, could significantly impact the distribution of ELS anchovies. In some periods, the resulting distribution might be due to a combination of these processes. Circulation can also play a key role in ELS anchovy aggregation within short time scales (20 days). This work showcases the potential of observation-based approaches and emphasizes the relevance of coastal observatories for integrated studies.

Published
2024

4. Effect of circulation at early life stages of European anchovy in the Bay of Biscay from observational data and a Lagrangian approach

Author

Manso-Narvarte, Ivan, primary, Caballero, Ainhoa, additional, Hernández-Carrasco, Ismael, additional, Orfila, Alejandro, additional, Mocoroa, María Santos, additional, Cotano, Unai, additional, Jordà, Gabriel, additional, Declerck, Amandine, additional, Delpey, Matthias, additional, and Rubio, Anna, additional

Published
2023
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5. Synthesis of satellite validation results

Author

Mulet, Sandrine, Boone, Christine, Barcelo-Llull, Barbara, Zarokanellos, Nikolaos, Pascual, Ananda, Manso-Narvarte, Ivan, Caballero, Ainhoa, Rubio, Anna, Bretagnon, Marine, and Mangin, Antoine

Abstract

This report presents the results of Task 4.4: Improving the use of in situ observations for the long-term validation of satellite observations

Published
2022

7. Coastal submesoscale processes and their effect on phytoplankton distribution in the southeastern Bay of Biscay

Author

Davila, Xabier, Rubio, Anna, Artigas, Luis Felipe, Puillat, Ingrid, Manso-narvarte, Ivan, Lazure, Pascal, Caballero, Ainhoa, Davila, Xabier, Rubio, Anna, Artigas, Luis Felipe, Puillat, Ingrid, Manso-narvarte, Ivan, Lazure, Pascal, and Caballero, Ainhoa

Abstract

Submesoscale processes have a determinant role in the dynamics of oceans by transporting momentum, heat, mass, and particles. Furthermore, they can define niches where different phytoplankton species flourish and accumulate not only by nutrient provisioning but also by modifying the water column structure or active gathering through advection. In coastal areas, however, submesoscale oceanic processes act together with coastal ones, and their effect on phytoplankton distribution is not straightforward. The present study brings the relevance of hydrodynamic variables, such as vorticity, into consideration in the study of phytoplankton distribution, via the analysis of in situ and remote multidisciplinary data. In situ data were obtained during the ETOILE oceanographic cruise, which surveyed the Capbreton Canyon area in the southeastern part of the Bay of Biscay in early August 2017. The main objective of this cruise was to describe the link between the occurrence and distribution of phytoplankton spectral groups and mesoscale to submesoscale ocean processes. In situ discrete hydrographic measurements and multi-spectral chlorophyll a (chl a) fluorescence profiles were obtained in selected stations, while temperature, conductivity, and in vivo chl a fluorescence were also continuously recorded at the surface. On top of these data, remote sensing data available for this area, such as high-frequency radar and satellite data, were also processed and analysed. From the joint analysis of these observations, we discuss the relative importance and effects of several environmental factors on phytoplankton spectral group distribution above and below the pycnocline and at the deep chlorophyll maximum (DCM) by performing a set of generalized additive models (GAMs). Overall, salinity is the most important parameter modulating not only total chl a but also the contribution of the two dominant spectral groups of phytoplankton, brown and green algae groups. However, at the DCM, among

Published
2021
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12. Observational challenges for studying coastal eddies: an application case in the Bay of Biscay

Author

Rubio, Ana M., Isern-Fontanet, Jordi, Caballero, Ainhoa, Manso-Narvarte, Ivan, González-Haro, Cristina, and Turiel, Antonio

Abstract

Atlantic form Space Workshop, 23-25 January 2019, Southampton, UK.-- 16 pages, Recent work has demonstrated the recurrent presence of coastal eddies (diameter about 50 km) in the area covered by a land-based HF radar (HFR) in the SE Bay of Biscay. These eddies can persist during several weeks and play a significant role in the export of coastal rich waters towards the open ocean. The study of their surface properties at high temporal and spatial resolution is possible thanks to the continuous monitoring of surface currents within the HFR footprint area. Their observation using satellite measurements is also possible, although limited by the discontinuous coverage and resolution of the data. These rapidly evolving eddies can be detected by the altimetry; nevertheless, the low spatio-temporal resolution of the data does not always enable to map accurately the associated surface geostrophic currents. In the periods of low cloud coverage, visible and satellite IR data offer further possibilities, when combined with an appropriate theoretical framework as: the use of sequences of images to retrieve the velocity field that originated the motion of the observed tracers, or the use single SST maps to derive high-resolution surface currents using an approach based in the Surface Qua geostrophic (SQG) approximation. Lower-resolution but more repetitive maps can be constructed using microwave remote sensing data, as AMSRE SST or L-band SSS, that are not affected by the presence of clouds. Within the framework of SQG it is possible to retrieve the three-dimensional dynamics of the eddy, if environmental and dynamical conditions are the appropriate.These eddies could be more frequent than commonly thought, and thus may play a very significant role in the transport of water masses in the Atlantic. But in the absence of an extensive network of HFRs along the basin coast, this idea is speculative. The use of remote sensing maps to extract dynamic information about these coastal processes could help filling this gap. In this work, we investigate the range of application of SQG to solve and describe coastal eddies, comparing with measurements from the SE Bay of Biscay HFR and we discuss the prospect of extending this approach to the whole Atlantic coastal are

Published
2019

13. The seasonal intensification of the slope Iberian Poleward Current

Author

Rubio, Anna, Manso-Narvarte, Ivan, Caballero, Ainhoa, Corgnati, Lorenzo, Mantovani, Carlo, Reyes, Emma, Griffa, Annalisa, and Mader, Julien

Subjects
WATER CIRCULATION PATTERNS, SOUTHEASTERN BAY, SOUTHERN BAY, SE BAY, BISCAY, VARIABILITY
Abstract

not available

Published
2019

14. Copernicus Marine Service Ocean State Report, Issue 3 Introduction

Author

von Schuckmann, Karina, Le Traon, Pierre-Yves, Smith, Neville, Pascual, Ananda, Djavidnia, Samuel, Gattuso, Jean-Pierre, Gregoire, Marilaure, Nolan, Glenn, Aaboe, Signe, Aguiar, Eva, Alvarez Fanjul, Enrique, Alvera-Azcarate, Aida, Aouf, Lotfi, Barciela, Rosa, Behrens, Arno, Rivas, Maria Belmonte, Ismail, Sana Ben, Bentamy, Abderrahim, Borgini, Mireno, Brando, Vittorio E., Bensoussan, Nathaniel, Blauw, Anouk, Bryere, Philippe, Nardelli, Bruno Buongiorno, Caballero, Ainhoa, Yumruktepe, Veli Caglar, Cebrian, Emma, Chiggiato, Jacopo, Clementi, Emanuela, Corgnati, Lorenzo, de Alfonso, Marta, de Pascual Collar, Alvaro, Deshayes, Julie, Di Lorenzo, Emanuele, Dominici, Jean-Marie, Dupouy, Cecile, Drevillon, Marie, Echevin, Vincent, Eleveld, Marieke, Enserink, Lisette, Garcia Sotillo, Marcos, Garnesson, Philippe, Garrabou, Joaquim, Garric, Gilles, Gasparin, Florent, Gayer, Gerhard, Gohin, Francis, Grandi, Alessandro, Griffa, Annalisa, Gourrion, Jerome, Hendricks, Stefan, Heuze, Celine, Holland, Elisabeth, Iovino, Doroteaciro, Juza, Melanie, Kersting, Diego Kurt, Kipson, Silvija, Kizilkaya, Zafer, Korres, Gerasimos, Kouts, Mariliis, Lagemaa, Priidik, Lavergne, Thomas, Lavigne, Heloise, Ledoux, Jean-Baptiste, Legeais, Jean-Francois, Lehodey, Patrick, Linares, Cristina, Liu, Ye, Mader, Julien, Maljutenko, Ilja, Mangin, Antoine, Manso-Narvarte, Ivan, Mantovani, Carlo, Markager, Stiig, Mason, Evan, Mignot, Alexandre, Menna, Milena, Monier, Maeva, Mourre, Baptiste, Muller, Malte, Nielsen, Jacob Woge, Notarstefano, Giulio, Ocana, Oscar, Patti, Bernardo, Payne, Mark R., Peirache, Marion, Pardo, Silvia, Perez Gomez, Begona, Pisano, Andrea, Perruche, Coralie, Peterson, K. Andrew, Pujol, Marie-Isabelle, Raudsepp, Urmas, Ravdas, Michalis, Raj, Roshin P., Renshaw, Richard, Reyes, Emma, Ricker, Robert, Rubio, Anna, Sammartino, Michela, Santoleri, Rosalia, Sathyendranath, Shubha, Schroeder, Katrin, She, Jun, Sparnocchia, Stefania, Staneva, Joanna, Stoffelen, Ad, Szekely, Tanguy, Tilstone, Gavin H., Tinker, Jonathan, Tintore, Joaquin, Tranchant, Benoit, Uiboupin, Rivo, Van der Zande, Dimitry, Wood, Richard, Zabala, Mikel, Zacharioudaki, Anna, Zuberer, Frederic, Zuo, Hao, von Schuckmann, Karina, Le Traon, Pierre-Yves, Smith, Neville, Pascual, Ananda, Djavidnia, Samuel, Gattuso, Jean-Pierre, Gregoire, Marilaure, Nolan, Glenn, Aaboe, Signe, Aguiar, Eva, Alvarez Fanjul, Enrique, Alvera-Azcarate, Aida, Aouf, Lotfi, Barciela, Rosa, Behrens, Arno, Rivas, Maria Belmonte, Ismail, Sana Ben, Bentamy, Abderrahim, Borgini, Mireno, Brando, Vittorio E., Bensoussan, Nathaniel, Blauw, Anouk, Bryere, Philippe, Nardelli, Bruno Buongiorno, Caballero, Ainhoa, Yumruktepe, Veli Caglar, Cebrian, Emma, Chiggiato, Jacopo, Clementi, Emanuela, Corgnati, Lorenzo, de Alfonso, Marta, de Pascual Collar, Alvaro, Deshayes, Julie, Di Lorenzo, Emanuele, Dominici, Jean-Marie, Dupouy, Cecile, Drevillon, Marie, Echevin, Vincent, Eleveld, Marieke, Enserink, Lisette, Garcia Sotillo, Marcos, Garnesson, Philippe, Garrabou, Joaquim, Garric, Gilles, Gasparin, Florent, Gayer, Gerhard, Gohin, Francis, Grandi, Alessandro, Griffa, Annalisa, Gourrion, Jerome, Hendricks, Stefan, Heuze, Celine, Holland, Elisabeth, Iovino, Doroteaciro, Juza, Melanie, Kersting, Diego Kurt, Kipson, Silvija, Kizilkaya, Zafer, Korres, Gerasimos, Kouts, Mariliis, Lagemaa, Priidik, Lavergne, Thomas, Lavigne, Heloise, Ledoux, Jean-Baptiste, Legeais, Jean-Francois, Lehodey, Patrick, Linares, Cristina, Liu, Ye, Mader, Julien, Maljutenko, Ilja, Mangin, Antoine, Manso-Narvarte, Ivan, Mantovani, Carlo, Markager, Stiig, Mason, Evan, Mignot, Alexandre, Menna, Milena, Monier, Maeva, Mourre, Baptiste, Muller, Malte, Nielsen, Jacob Woge, Notarstefano, Giulio, Ocana, Oscar, Patti, Bernardo, Payne, Mark R., Peirache, Marion, Pardo, Silvia, Perez Gomez, Begona, Pisano, Andrea, Perruche, Coralie, Peterson, K. Andrew, Pujol, Marie-Isabelle, Raudsepp, Urmas, Ravdas, Michalis, Raj, Roshin P., Renshaw, Richard, Reyes, Emma, Ricker, Robert, Rubio, Anna, Sammartino, Michela, Santoleri, Rosalia, Sathyendranath, Shubha, Schroeder, Katrin, She, Jun, Sparnocchia, Stefania, Staneva, Joanna, Stoffelen, Ad, Szekely, Tanguy, Tilstone, Gavin H., Tinker, Jonathan, Tintore, Joaquin, Tranchant, Benoit, Uiboupin, Rivo, Van der Zande, Dimitry, Wood, Richard, Zabala, Mikel, Zacharioudaki, Anna, Zuberer, Frederic, and Zuo, Hao

Published
2019
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15. Copernicus Marine Service Ocean State Report, Issue 3

Author

von Schuckmann, Karina, Le Traon, Pierre-Yves, Smith, Neville, Pascual, Ananda, Djavidnia, Samuel, Gattuso, Jean-Pierre, Grégoire, Marilaure, Nolan, Glenn, Aaboe, Signe, Aguiar, Eva, Álvarez Fanjul, Enrique, Alvera-Azcárate, Aida, Aouf, Lotfi, Barciela, Rosa, Behrens, Arno, Belmonte Rivas, Maria, Ben Ismail, Sana, Bentamy, Abderrahim, Borgini, Mireno, Brando, Vittorio E., Bensoussan, Nathaniel, Blauw, Anouk, Bryère, Philippe, Buongiorno Nardelli, Bruno, Caballero, Ainhoa, Çağlar Yumruktepe, Veli, Cebrian, Emma, Chiggiato, Jacopo, Clementi, Emanuela, Corgnati, Lorenzo, de Alfonso, Marta, de Pascual Collar, Álvaro, Deshayes, Julie, Di Lorenzo, Emanuele, Dominici, Jean-Marie, Dupouy, Cécile, Drévillon, Marie, Echevin, Vincent, Eleveld, Marieke, Enserink, Lisette, García Sotillo, Marcos, Garnesson, Philippe, Garrabou, Joaquim, Garric, Gilles, Gasparin, Florent, Gayer, Gerhard, Gohin, Francis, Grandi, Alessandro, Griffa, Annalisa, Gourrion, Jérôme, Hendricks, Stefan, Heuzé, Céline, Holland, Elisabeth, Iovino, Doroteaciro, Juza, Mélanie, Kurt Kersting, Diego, Kipson, Silvija, Kizilkaya, Zafer, Korres, Gerasimos, Kõuts, Mariliis, Lagemaa, Priidik, Lavergne, Thomas, Lavigne, Heloise, Ledoux, Jean-Baptiste, Legeais, Jean-François, Lehodey, Patrick, Linares, Cristina, Liu, Ye, Mader, Julien, Maljutenko, Ilja, Mangin, Antoine, Manso-Narvarte, Ivan, Mantovani, Carlo, Markager, Stiig, Mason, Evan, Mignot, Alexandre, Menna, Milena, Monier, Maeva, Mourre, Baptiste, Müller, Malte, Nielsen, Jacob Woge, Notarstefano, Giulio, Ocaña, Oscar, Patti, Bernardo, Payne, Mark R., Peirache, Marion, Pardo, Silvia, Pérez Gómez, Begoña, Pisano, Andrea, Perruche, Coralie, Peterson, K. Andrew, Pujol, Marie-Isabelle, Raudsepp, Urmas, Ravdas, Michalis, Raj, Roshin P., Renshaw, Richard, Reyes, Emma, Ricker, Robert, Rubio, Anna, Sammartino, Michela, Santoleri, Rosalia, Sathyendranath, Shubha, Schroeder, Katrin, She, Jun, Sparnocchia, Stefania, Staneva, Joanna, Stoffelen, Ad, Szekely, Tanguy, Tilstone, Gavin H., Tinker, Jonathan, Tintoré, Joaquín, Tranchant, Benoît, Uiboupin, Rivo, Van der Zande, Dimitry, Wood, Richard, Woge Nielsen, Jacob, Zabala, Mikel, Zacharioudaki, Anna, Zuberer, Frédéric, Zuo, Hao, von Schuckmann, Karina, Le Traon, Pierre-Yves, Smith, Neville, Pascual, Ananda, Djavidnia, Samuel, Gattuso, Jean-Pierre, Grégoire, Marilaure, Nolan, Glenn, Aaboe, Signe, Aguiar, Eva, Álvarez Fanjul, Enrique, Alvera-Azcárate, Aida, Aouf, Lotfi, Barciela, Rosa, Behrens, Arno, Belmonte Rivas, Maria, Ben Ismail, Sana, Bentamy, Abderrahim, Borgini, Mireno, Brando, Vittorio E., Bensoussan, Nathaniel, Blauw, Anouk, Bryère, Philippe, Buongiorno Nardelli, Bruno, Caballero, Ainhoa, Çağlar Yumruktepe, Veli, Cebrian, Emma, Chiggiato, Jacopo, Clementi, Emanuela, Corgnati, Lorenzo, de Alfonso, Marta, de Pascual Collar, Álvaro, Deshayes, Julie, Di Lorenzo, Emanuele, Dominici, Jean-Marie, Dupouy, Cécile, Drévillon, Marie, Echevin, Vincent, Eleveld, Marieke, Enserink, Lisette, García Sotillo, Marcos, Garnesson, Philippe, Garrabou, Joaquim, Garric, Gilles, Gasparin, Florent, Gayer, Gerhard, Gohin, Francis, Grandi, Alessandro, Griffa, Annalisa, Gourrion, Jérôme, Hendricks, Stefan, Heuzé, Céline, Holland, Elisabeth, Iovino, Doroteaciro, Juza, Mélanie, Kurt Kersting, Diego, Kipson, Silvija, Kizilkaya, Zafer, Korres, Gerasimos, Kõuts, Mariliis, Lagemaa, Priidik, Lavergne, Thomas, Lavigne, Heloise, Ledoux, Jean-Baptiste, Legeais, Jean-François, Lehodey, Patrick, Linares, Cristina, Liu, Ye, Mader, Julien, Maljutenko, Ilja, Mangin, Antoine, Manso-Narvarte, Ivan, Mantovani, Carlo, Markager, Stiig, Mason, Evan, Mignot, Alexandre, Menna, Milena, Monier, Maeva, Mourre, Baptiste, Müller, Malte, Nielsen, Jacob Woge, Notarstefano, Giulio, Ocaña, Oscar, Patti, Bernardo, Payne, Mark R., Peirache, Marion, Pardo, Silvia, Pérez Gómez, Begoña, Pisano, Andrea, Perruche, Coralie, Peterson, K. Andrew, Pujol, Marie-Isabelle, Raudsepp, Urmas, Ravdas, Michalis, Raj, Roshin P., Renshaw, Richard, Reyes, Emma, Ricker, Robert, Rubio, Anna, Sammartino, Michela, Santoleri, Rosalia, Sathyendranath, Shubha, Schroeder, Katrin, She, Jun, Sparnocchia, Stefania, Staneva, Joanna, Stoffelen, Ad, Szekely, Tanguy, Tilstone, Gavin H., Tinker, Jonathan, Tintoré, Joaquín, Tranchant, Benoît, Uiboupin, Rivo, Van der Zande, Dimitry, Wood, Richard, Woge Nielsen, Jacob, Zabala, Mikel, Zacharioudaki, Anna, Zuberer, Frédéric, and Zuo, Hao

Published
2019

18. Copernicus Marine Service Ocean State Report, Issue 3

Author

von Schuckmann, Karina, primary, Le Traon, Pierre-Yves, additional, Smith, Neville, additional, Pascual, Ananda, additional, Djavidnia, Samuel, additional, Gattuso, Jean-Pierre, additional, Grégoire, Marilaure, additional, Nolan, Glenn, additional, Aaboe, Signe, additional, Aguiar, Eva, additional, Álvarez Fanjul, Enrique, additional, Alvera-Azcárate, Aida, additional, Aouf, Lotfi, additional, Barciela, Rosa, additional, Behrens, Arno, additional, Belmonte Rivas, Maria, additional, Ben Ismail, Sana, additional, Bentamy, Abderrahim, additional, Borgini, Mireno, additional, Brando, Vittorio E., additional, Bensoussan, Nathaniel, additional, Blauw, Anouk, additional, Bryère, Philippe, additional, Buongiorno Nardelli, Bruno, additional, Caballero, Ainhoa, additional, Çağlar Yumruktepe, Veli, additional, Cebrian, Emma, additional, Chiggiato, Jacopo, additional, Clementi, Emanuela, additional, Corgnati, Lorenzo, additional, de Alfonso, Marta, additional, de Pascual Collar, Álvaro, additional, Deshayes, Julie, additional, Di Lorenzo, Emanuele, additional, Dominici, Jean-Marie, additional, Dupouy, Cécile, additional, Drévillon, Marie, additional, Echevin, Vincent, additional, Eleveld, Marieke, additional, Enserink, Lisette, additional, García Sotillo, Marcos, additional, Garnesson, Philippe, additional, Garrabou, Joaquim, additional, Garric, Gilles, additional, Gasparin, Florent, additional, Gayer, Gerhard, additional, Gohin, Francis, additional, Grandi, Alessandro, additional, Griffa, Annalisa, additional, Gourrion, Jérôme, additional, Hendricks, Stefan, additional, Heuzé, Céline, additional, Holland, Elisabeth, additional, Iovino, Doroteaciro, additional, Juza, Mélanie, additional, Kurt Kersting, Diego, additional, Kipson, Silvija, additional, Kizilkaya, Zafer, additional, Korres, Gerasimos, additional, Kõuts, Mariliis, additional, Lagemaa, Priidik, additional, Lavergne, Thomas, additional, Lavigne, Heloise, additional, Ledoux, Jean-Baptiste, additional, Legeais, Jean-François, additional, Lehodey, Patrick, additional, Linares, Cristina, additional, Liu, Ye, additional, Mader, Julien, additional, Maljutenko, Ilja, additional, Mangin, Antoine, additional, Manso-Narvarte, Ivan, additional, Mantovani, Carlo, additional, Markager, Stiig, additional, Mason, Evan, additional, Mignot, Alexandre, additional, Menna, Milena, additional, Monier, Maeva, additional, Mourre, Baptiste, additional, Müller, Malte, additional, Nielsen, Jacob Woge, additional, Notarstefano, Giulio, additional, Ocaña, Oscar, additional, Patti, Bernardo, additional, Payne, Mark R., additional, Peirache, Marion, additional, Pardo, Silvia, additional, Pérez Gómez, Begoña, additional, Pisano, Andrea, additional, Perruche, Coralie, additional, Peterson, K. Andrew, additional, Pujol, Marie-Isabelle, additional, Raudsepp, Urmas, additional, Ravdas, Michalis, additional, Raj, Roshin P., additional, Renshaw, Richard, additional, Reyes, Emma, additional, Ricker, Robert, additional, Rubio, Anna, additional, Sammartino, Michela, additional, Santoleri, Rosalia, additional, Sathyendranath, Shubha, additional, Schroeder, Katrin, additional, She, Jun, additional, Sparnocchia, Stefania, additional, Staneva, Joanna, additional, Stoffelen, Ad, additional, Szekely, Tanguy, additional, Tilstone, Gavin H., additional, Tinker, Jonathan, additional, Tintoré, Joaquín, additional, Tranchant, Benoît, additional, Uiboupin, Rivo, additional, Van der Zande, Dimitry, additional, von Schuckmann, Karina, additional, Wood, Richard, additional, Woge Nielsen, Jacob, additional, Zabala, Mikel, additional, Zacharioudaki, Anna, additional, Zuberer, Frédéric, additional, and Zuo, Hao, additional

Published
2019
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19. Coastal mesoscale processes and their effect in phytoplankton distribution and community composition in the SE Bay of Biscay.

Author

Davila, Xabier, Rubio, Anna, Artigas, Felipe, Puillat, Ingrid, Manso-Narvarte, Ivan, Lazure, Pascal, and Caballero, Ainhoa

Subjects
EUPHOTIC zone, PHYTOPLANKTON, MIXING height (Atmospheric chemistry), REMOTE sensing, BAYS, COMMUNITIES
Abstract

Mesoscale dynamics play a major role in several ocean processes, not only in the transport of momentum, heat, mass, particles and microorganisms but also in the provisioning of nutrients into the euphotic zone. Mesoscale processes can define niches where specific phytoplankton species flourish. However, this effect is not straightforward in coastal areas, which are submitted to a more complex interplay between different oceanic processes. In this context, the ETOILE campaign surveyed the CapBreton canyon area in the South-East of Bay of Biscay in early August 2017. The main objective of this study was to link the occurrence and distribution of phytoplankton with the mesoscale ocean processes. On top of the remote sensing data available for this area, such as High Frequency radar or satellite data, in situ discrete hydrographic measurements were carried out by a CTD and a Moving Vessel Profiler. Likewise, multi-spectral fluorescence casts were performed in selected stations. Other parameters such as temperature, conductivity and in vivo multi-spectral fluorescence were also continuously recorded at surface. From our observations, we discuss on the distinct effect and importance of different factors affecting the phytoplankton distribution. Overall, salinity is the most important parameter modulating not only algae distribution but also the composition of the community in terms of spectral groups. Although below the mixed layer salinity still impacts significantly phytoplankton, vorticity comes into play and becomes the dominant factor determining both distribution and composition. The present study brings into consideration the relevance of the hydrodynamical variables in the study of phytoplankton. [ABSTRACT FROM AUTHOR]

Published
2020
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22. Three-Dimensional Reconstruction of Ocean Circulation from Coastal Marine Observations: Challenges and Methods.

Author

Manso-Narvarte, Ivan, Fredj, Erick, Jordà, Gabriel, Berta, Maristella, Griffa, Annalisa, Caballero, Ainhoa, and Rubio, Anna

Subjects
OCEAN circulation, DISCRETE cosine transforms, SUSTAINABLE development, COVARIANCE matrices, MARINE ecology
Abstract

Monitoring and investigating the dynamics of coastal currents is crucial for the development of environmentally sustainable coastal activities, in order to preserve marine ecosystems as well as to support marine and navigation safety. This need is driving the set-up of a growing number of multiplatform operational observing systems, aiming to the continuous monitoring of the coastal ocean. A significant percent of the existing observatories is today equipped with land-based High Frequency Radars (HFR), which provide real-time currents with unprecedent coverage and resolution, limited however, to the surface layer. The combination of data from HFR with complementary data from in-situ platforms providing information of the currents at subsurface layers (ADCP moorings) is investigated here to reconstruct the 3D current velocity field from in-situ observations. For this purpose, two methods based on different approaches are used. On the one hand, the Reduced Order Optimal Interpolation which is fed, in this case, with a spatial covariance matrix extracted from a realistic numerical oceanic simulation; and on the other hand, the Discrete Cosine Transform Penalized Least Square, which is a data gap-filling method based on penalized least squares regression that balances fidelity to the data and smoothness of the solution. As a proof of concept, we test the methods' skills by using emulated observations of currents, extracted from a numerical simulation (3D reference field). The test set-up emulates the real observatory scenario in the study area (south-eastern Bay of Biscay), which includes a long-range HFR and two ADCP moorings inside the HFR footprint area. Then, the reconstructed fields (outputs of the methods) are compared with the 3D reference fields. In general, the results show satisfactory 3D reconstructions with mean spatial (for each depth level) errors between 0.55-10.94 cm s-1 for the first 150 m depth. The methods perform better in well sampled areas, and although different performances between the methods are observed, both show promising skills for the computation of new operational products integrating complementary observations, broadening the applications of in-situ observational data. [ABSTRACT FROM AUTHOR]

Published
2019
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23. Joint analysis of coastal altimetry and HF radar data: observability of seasonal and mesoscale ocean dynamics in the Bay of Biscay.

Author

Manso-Narvarte, Ivan, Caballero, Ainhoa, Rubio, Anna, Dufau, Claire, and Birol, Florence

Subjects
RADAR altimetry, GEOSTROPHIC currents, MESOSCALE eddies
Abstract

Coastal HF radar systems provide operational measurements of coastal surface currents with high spatial (~ 1-5 km) and temporal (~ hourly) sampling resolution while the near continuous altimetry missions afford, from 1993 to nowadays, information of geostrophic currents in the global ocean with typical along-track and temporal sampling resolutions of > 7 km and > 9 days, respectively. During the last years, the altimetry community has made a step forward in improving these data in the coastal area, where the data present lower quality than in the open ocean. The combination of HF radar and altimetry measurements arises as a promising strategy to improve the continuous monitoring of the coastal area (e.g. by expanding the measurements made by HF radars to adjacent areas covered by the altimetry, or by validating/confirming improvements brought by specific coastal algorithms or new altimeter missions). A first step towards this combination is the comparison of both datasets in the overlapping areas. In this study, a HF radar system and two Jason-2 satellite altimetry products with different processing (CTOH and CMEMS) are compared over the period from 1 January 2009 to 24 July 2015. The results provide an evaluation of the performance of different coastal altimetry datasets within the study area and a better understanding of the ocean variability contained in the HF radar and both altimetry data sets. The variability of the radar and altimetry measurements is higher near the coast, and both observing systems detect the Iberian Poleward Current and eddies, which are the main mesoscale processes within the study area. The highest correlations between radar and altimetry (up to 0.64) take place in the slope, where the Iberian Poleward Current represents a significant part of the mesoscale variability. Besides, the use of a simple Ekman model to add the wind-induced current component to the to the altimetry-derived geostrophic currents increases the agreement between both data sets (increasing the correlation in around 10 %). [ABSTRACT FROM AUTHOR]

Published
2018
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