Josephine Ras
Analytical Engineer (2001-present)
Contact information:
Phone: +33 (0)4 93 76 38 75
Fax: +33 (0)4 93 76 37 39
M.Sc. Oceanography (1998-1999)
University of Southampton, Southampton, United Kingdom
Dissertation topic: Primary production modelling from ocean colour satellite data: a practical study on the Mediterranean sea
Maitrise Sciences de l'environnement marin (1997-1998)
Université de Bordeaux I, Bordeaux, France
Licence Science de la Terre (1996-1997)
Université de Bordeaux I, Bordeaux, France
Diplome de Technicien Supérieur de la mer (DTSM) (1994-1996)
INTECHMER (CNAM), Cherbourg, France
Research interests:
Marine analytical chemistry, High Performance Liquid Chromatography (HPLC) applied to the analysis of phytoplankton pigments (chlorophylls, carotenoids), HPLC method development (pigments, bacteriochlorophylls and mycosporine amino acids), particulate absorption.


  • Mayot, N., D’Ortenzio, F., Uitz, J. Gentili, B., Ras, J., Vellucci, V., Golbol, M., Antoine, D. and H. Claustre (2017), Influence of the phytoplankton community structure on the spring and annual primary production in the North-Western Mediterranean Sea, Journal of Geophysical Research, 10.1002/2016JC012668
  • Roesler, C., J. Uitz, J, Claustre, H., Boss, E., Xing, X., Organelli, E., Briggs, N., Bricaud, A., Schmechtig, C., Poteau, A., D’Ortenzio, F., Ras, J., Drapeau, S., Haëntjens, N. and M. Barbieux (2017), Recommendations for obtaining unbiased chlorophyll estimates fromin situ chlorophyll fluorometers: A global analysis of WET Labs ECOsensors, Limnology and Oceanography methods, doi: 10.1002/lom3.10185
  • 2015

  • Sauzede, R., Claustre, H., Jamet, C., Uitz, J., Ras, J., Mignot, A. and F. D'Ortenzio (2015). Retrieving the vertical distribution of chlorophyll a concentration and phytoplankton community composition from in situ fluorescence profiles: A method based on a neural network with potential for global-scale applications. Journal of Geophysical Research, 119, doi:10.1002/2014JC010355 (Get PDF Reprint)
  • 2014

  • Chase, A., Boss, E., Zaneveld, R., Bricaud, A., Claustre, H., Ras, J., Dall'Olmo, G., and T. Westberry. Decomposition of in situ particulate absorption spectra. Methods in Oceanography, (Get PDF Reprint)
  • 2013

  • Boss, E, M. Picheral, T. Leeuw, A. Chase, E. Karsenti, G. Gorsky, L. Taylor, W. Slade, J. Ras and ,H. Claustre (2013). The characteristics of particulate absorption, scattering and attenuation coefficients in the surface ocean; Contribution of the Tara Oceans expedition. Methods in Oceanography, (Get PDF Reprint).
  • Peloquin, J., C. Swan, N. Gruber, M. Vogt, H. Claustre, J. Ras, J. Uitz, R. Barlow, M. Behrenfeld, R. Bidigare, H. Dierssen, G. Ditullio, E. Fernandez, C. Gallienne, S. Gibb, R. Goericke, L. Harding, E. Head, P. Holligan, S. Hooker, D. Karl, M. Landry, R. Letelier, C. A. Llewellyn, M. Lomas, M. Lucas, A. Mannino, J.-C. Marty, B. G. Mitchell, F. Muller-Karger, N. Nelson, C. O'Brien, B. Prezelin, D. Repeta, W. O. Smith Jr., D. Smythe-Wright, R. Stumpf, A. Subramaniam, K. Suzuki, C. Trees, M. Vernet, N. Wasmund, and S. Wright. The MAREDAT global database of high performance liquid chromatography marine pigment measurements. Earth System Science Data, 5, 109–123, 2013 (Get PDF Reprint)
  • 2012

  • Xing, X., Claustre, H., Blain, S., D'Ortenzio, F., Antoine, D., Ras, J., Guinet, C. (2012). Quenching correction for in vivo chlorophyll fluorescence acquired by autonomous platforms: A case study with instrumented elephant seals in the Kerguelen region (Southern Ocean). Limnology and Oceanography Methods, 10, 483-495. (Get PDF reprint)
  • 2011

  • Belviso, S., I. Masotti, A. Tagliabue, L. Bopp, P. Brockmann, C. Fichot, G. Caniaux, L. Prieur, J. Ras, J. Uitz, H. Loisel, D. Desailly, S. Alvain, N. Kasamatsu, and M. Fukuchi (2011), DMS dynamics in the most oligotrophic subtropical zones of the global ocean, Biogeochemistry, DOI 10.1007/s10533-011-9648-1. (Get PDF Reprint)
  • Crombet, Y., Leblanc, K. Quéguiner, B., Moutin, T., Rimmelin, P., Ras, J., Claustre, H., Leblond, N., Oriol, L. and M. Pujo-Pay (2011). Deep silicon maxima in the stratified oligotrophic Mediterranean Sea. Biogeosciences, 8, 459–475. (Acess to paper on line)
  • Loisel, H., V. Vantrepotte, K. Norkvist, X.Mériaux, M. Kheireddine, J. Ras, M. Pujo-Pay, Y. Combet, K. Leblanc, G. Dall’Olmo, R. Mauriac, D. Dessailly and T. Moutin (2011). Characterization of the bio-optical anomaly and diurnal variability of particulate matter, as seen from scattering and backscattering coefficients, in ultra-oligotrophic eddies of the Mediterranean Sea, Biogeosciences, 8, 3295–3317. (Acess to paper on line). doi:10.5194/bg-8-3295-2011.
  • Mignot, A., Claustre, H., F. D'Ortenzio, F., Xing, X, Poteau, A. and J. Ras (2011). From the shape of the vertical profile of in vivo fluorescence to Chlorophyll-a concentration. Biogeosciences, 8, 2391–2406, doi:10.5194/bg-8-2391-2011 (Get PDF Reprint)
  • 2010

  • Bricaud, A., Babin, M., Claustre, H., Ras, J. and F. Tieche (2010). Light absorption properties and absorption budget of South East Pacific waters. Journal of Geophysical Research, VOL. 115, C08009, doi:10.1029/2009JC005517. (Get PDF Reprint)
  • 2009

  • Uitz, J., H. Claustre, N. Garcia, F.B. Griffiths, J. Ras and V. Sandroni (2009). A phytoplankton class-specific primary production model applied to the Kerguelen Islands region (Southern Ocean). Deep-Sea Research I, doi:10.1016/j.dsr.2008.11.006.
  • 2008

  • Obernosterer, I., Catala, P., Lami, R., Caparros, J., Ras, J., Bricaud, A., Dupuy, C., Van Wambeke, F. and P. Lebaron (2008). Biochemical characteristics and bacterial community structure of the sea surface microlayer in the South Pacific Ocean. Biogeosciences, 5, 693-705 Access to paper on line
  • Ras, J, Uitz, J, and H. Claustre (2008). Spatial variability of phytoplankton pigment distributions in the Subtropical South Pacific Ocean: comparison between in situ and modelled data. Biogeosciences, 5, 353-369 Access to paper on line
  • 2007

  • Chazottes, A., Crepon, M., Bricaud, A., Ras, J. and S. Thiria (2007). Statistical analysis of absorption spectra of phytoplankton and of pigment concentrations observed during three POMME cruises using a neural network clustering method. Applied Optics, 46 (18), 3790-3799. (Get PDF Reprint)
  • Dolan, J., M. E. Ritchie, M.E. and J. J. Ras (2007). The "neutral" community structure of planktonic herbivores, tintinnid ciliates of the microzooplankton, across the SE Tropical Pacific Ocean. Biogeosciences , 4, 297-310, (Access to paper on line)
  • Fishwick J.R., Aiken, J., Barlow, R., Sessions, H., Bernard, S., Ras, J. (2007). Functional relationships and bio-optical properties derived from phytoplankton pigments, optical and photosynthetic parameters; a case study of the Benguela ecosystem. Journal of the Marine Biological Association of the United Kingdom, 86(6), 1267-1280.
  • Lami, R., Cottrell, M.T., Ras, J., Ulloa, O., Obernosterer, I., Claustre, H., Kirchman, D.L. and P. Lebaron (2007). High Abundances of Aerobic Anoxygenic Photosynthetic Bacteria in the South Pacific Ocean. Applied Environemental Microbiology, July 2007, 4198-4205, doi:10.1128/AEM.02652-06 (Get PDF Reprint).
  • Morel, A., Gentili, B., Claustre, H., Babin, M., Bricaud, A., Ras, J., and F. Tieche (2007) Optical properties of the "clearest" natural waters, Limnology and Oceanography, 52(1), 217-229 (Get PDF Reprint).
  • 2006

  • Aiken, J. , J. R. Fishwick, S. Lavender, R. Barlow, G. F. Moore, H. Sessions, S. Bernard, J. Ras, and N. J. Hardman-Mountford (2006). Validation of MERIS reflectance and chlorophyll during the BENCAL cruise October, 2002: preliminary validation of new demonstration products for phytoplankton functional types and photosynthetic parameters. International Journal of Remote Sensing, 28, 497-516. (Get PDF Reprint)
  • Antoine, D. M. Chami, H. Claustre, F. D'Ortenzio, A. Morel, G. Bécu, B. Gentili, F. Louis, J. Ras, E. Roussier, A.J. Scott, D. Tailliez, S. B. Hooker, P. Guevel, J.-F. Desté, C. Dempsey and D. Adams. 2006, BOUSSOLE : a joint CNRS-INSU, ESA, CNES and NASA Ocean Color Calibration And Validation Activity. NASA Technical memorandum N° 2006 - 214147, 61 pp. (Get PDF Reprint).
  • Marie D., Zhu F., Balague V., Ras J., Vaulot D. Eukaryotic picoplankton communities of the Mediterranean Sea in summer assessed by molecular approaches (DGGE, TTGE, QPCR). FEMS Microbiology Ecology,55, 403-415. (Get PDF Reprint)
  • Morel, A., Gentili, B., Chami, M., and J. Ras (2006) Bio-optical properties of high chlorophyll Case 1 waters, and of yellow-substance- dominated Case 2 waters. Deep-Sea Research I, 53, 1439-1559 (Get PDF Reprint)
  • 2005

  • Bonnet S ., C. Guieu, J. Chiaverini, J. Ras, A. Stock (2005), Impact of atmospheric inputs on the autotrophic communities in a low nutrient low chlorophyll system, Limnology and Oceanography, 50(6), 1810-1819 (Get PDF Reprint)
  • Claustre, H., Babin, M., Merien, D., Ras, J., Prieur, L., Dallot, S., Prasil, O., Dousova, H. and T. Moutin (2005). Towards a taxon-specific parameterization of bio-optical models of primary production a case study in the North Atlantic. Journal of Geophysical Research, 110, (C07S12, doi:10.1029/2004JC002634). (Get PDF Reprint)
  • Leblanc K., Leynaert A., Fernandez C.I., Rimmelin P., Moutin T., Raimbault P., Ras J., Quéguiner B. A seasonal study of diatom dynamics in the North Atlantic during the POMME experiment (2001): evidence for Si limitation of the spring bloom. Journal of Geophysical Research, 110, No. C7, C07S14, doi:10.1029/2004JC002621. (Get PDF Reprint)
  • Maixandeau, A., Lefèvre, D., Fernandez, C., Sempéré, R., Fukuda-Sohrin, R., Ras, J., Van Wambeke, F., Caniaux, G. and B. Quéguiner. Mesoscale and seasonal variability of community production and respiration in the NE Atlantic Ocean. Deep-Sea Research I, 52, 1663-1676 (Get PDF Reprint)
  • Thyssen M., Lefèvre D., Caniaux G., Ras J., Fernandez C.I., Denis M. (2005). Spatial distribution of heterotrophic bacteria in the Northeast Atlantic (POMME area study) during spring 2001. Journal of Geophysical Research, 110, C07S16, doi:10.1029/2004JC002670 (Get PDF Reprint)
  • 2004

  • Blain, S., Guieu, C., Claustre, H., Ras, J., Leblanc, K., Moutin, T., Quéguiner, B. and G. Sarthou (2004). Availability of iron for phytoplankton in the north-east Atlantic Ocean. Limnology and Oceanography, 49, 2095-2104 (Get PDF Reprint)
  • Bricaud, A., Claustre, H., Ras, J. and K. Oubelkheir (2004). Natural variability of phytoplankton absorption in oceanic waters: influence of the size structure of algal populations. Journal of Geophysical Research, 109, C11010, doi:10.1029/2004JC002419 (Get PDF Reprint)
  • Claustre, H., Hooker, S.B., Van Heukelem, Berthon, J.-F., Barlow, R., Ras, J., Sessions, H., Targa, C., Thomas, C.S., van der Linde, D. and J.-C. Marty (2004). An intercomparison of HPLC phytoplankton methods using in situ samples: Application to remote sensing and database activities. Marine Chemistry, 85, 41-61 (Get PDF Reprint)
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