Julia Uitz
Research scientist (2012-present)
Contact information:
Phone: +33 (0)4 93 76 38 73
Fax: +33 (0)4 93 76 37 39
PhD in Biogeochemical Oceanography (2002-2006)
Université de la Méditerranée, Marseille, France
Laboratoire d’Océanographie de Villefranche, France
Dissertation topic: Structure of phytoplankton communities and photophysiological properties in the open ocean: Parameterization in view of applications to ocean color
M.Sc. Marine Environment Sciences (2001-2002)
Université de la Méditerranée, Marseille, France
Laboratoire d’Océanographie de Villefranche, France
Dissertation topic: Distribution of the phytoplankton biomass in the world’s oceans: Analysis of a HPLC pigment database
Employment record:
Post-doc (2007-2011)
Scripps Institution of Oceanography, University of California, San Diego, USA
Project 1: Temporal dynamics in the size distribution of biological particles (with a focus on colloids) and response of seawater optical properties.
Project 2: Assessing the biodiversity of phytoplankton communities from satellite and in situ optical measurements in the world’s oceans.
Research interests:
My research focuses on oceanic phytoplankton, community composition, and associated carbon fluxes over a broad range of timescales in the world’s open oceans and in several regions of particular biogeochemical interest. For this purpose I am particularly interested in utilizing and developing new approaches based on remote and in situ biological and optical measurements. These include primarily HPLC biomarker pigments, remote sensing of ocean color, inherent and apparent optical properties, bio-optical profiling floats.


  • Mayot, N., D’Ortenzio, F., Uitz, J. Gentili, B., Ras, J., Vellucci, V., Golbol, M., Antoine, D. and H. Claustre, Influence of the phytoplankton community structure on the spring and annual primary production in the North-Western Mediterranean Sea, Journal of Geophysical Research
  • Organelli, E., Claustre, H., Bricaud, A., Barbieux, M., Uitz, J., D’Ortenzio, F. and G. Dall’Olmo, Bio-optical anomalies in the world’s oceans: an investigation on the diffuse light attenuation coefficients derived from Biogeochemical Argo float measurements. Journal of Geophysical Research
  • 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, Challenges of and
    recommendations for absolute calibration of in situ fluorometers for assessing global phytoplankton
    distributions. Limnology and Oceanography methods,
  • 2016

  • Sauzede, R., H. Claustre, J. Uitz , C. Jamet, G. Dall'Olmo, F. D'Ortenzio, B. Gentili , A. Poteau and C. Schmechtig. A neural network-based method for merging ocean color and Argo data to extend surface bio-optical properties to depth: Retrieval of the particulate backscattering coefficient. Journal of Geophysical Research, 121, doi:10.1002/2015JC011408. (Get PDF Reprint)
  • 2015

  • Guidi, L., L. Legendre, G. Reygondeau, J. Uitz, L. Stemmann, S. A. Henson (2015). A new look at ocean carbon remineralization for estimating deepwater sequestration, Global Biogeochemical Cycles, 29, 1044–1059, doi:10.1002/2014GB005063.(Get PDF Reprint)
  • Legendre L., R.B. Rivkin, M. Weinbauer, L. Guidi, J. Uitz (2015). The microbial carbon pump concept: Potential biogeochemical significance in the globally changing ocean. Progress in Oceanography, doi: 10.1016/j.pocean.2015.01.008. (Get PDF Reprint).
  • 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)
  • Sauzede, R., Lavigne, H., Claustre, H., Uitz, J., Schmechtig, C., D'Ortenzio, F., Guinet, C. and S. Pesant (2015). Vertical distribution of chlorophyll a concentration and phytoplankton community composition from in situ fluorescence profiles: a first database for the global ocean. Earth System Science Data, www.earth-syst-sci-data.net/7/1/2015/, doi:10.5194/essd-7-1-2015 (Get PDF Reprint)
  • Stramski, D., R. A. Reynolds, S. Kaczmarek, J. Uitz, G. Zheng (2015). Correction of pathlength amplification in the filter-pad technique for measurements of particulate absorption coefficient in the visible spectral region, Applied Optics, 54, 6763-6782, doi: 10.1364/AO.54.006763.(Get PDF Reprint)
  • Uitz J., D. Stramski, R.A. Reynolds, J. Dubranna (2015). Assessing phytoplankton community composition from hyperspectral measurements of phytoplankton absorption coefficient and remote-sensing reflectance in open-ocean environments, Remote Sensing of Environment, 171, 58-74, doi:10.1016/j.rse.2015.09.027. (Get PDF Reprint)
  • 2014

  • Brewin R.J., Sathyendranath S. , Bricaud A., Ciotti A., Devred E., Hirata T., Kostadinov T., Loisel H., Mouw C.B., Uitz J. (2014) Chapter 4 - Detection of phytoplankton size structure by remote sensing. In: Sathyendranath S (ed), IOCCG Report Number 15, Phytoplankton Functional Types from Space, Dartmouth, Nova Scotia, Canada, 71-100.
  • Mignot, A., Claustre, H., Uitz, J., Poteau, A., D'Ortenzio, F. and X. Xing (2014) Understanding the seasonal dynamics of phytoplankton biomass and DCM in oligotrophic environments: a Bio-Argo float investigation. Global Biogeochemical Cycles, DOI: 10.1002/2013GB004781 (Get PDF reprint)
  • Xing, X., Claustre, H., Uitz, J., Mignot, A., Poteau, A. and H. Wang (2014). Seasonal Evolutions of Bio-optical Properties and Their Inter-relationships Observed by Bio-Argo Floats in the Sub-polar North Atlantic, Journal of Geophysical Research - Ocean, 119, doi:10.1002/2014JC010189. (Get PDF Reprint)
  • 2013

  • Organelli, E. , A. Bricaud, D. Antoine and J. Uitz (2013). Multivariate approach for the retrieval of phytoplankton size structure from measured light absorption spectra in the Mediterranean Sea (BOUSSOLE site). Applied Optics, 52, 2257-2273. (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 www.earth-syst-sci-data.net/5/109/2013/ (Get PDF Reprint)
  • 2012

  • Alvain, S., V. Vantrepotte, J. Uitz, L. Duforêt-Gaurier (2012). Use of global satellite observations to collect information in marine ecology, In Sensors for ecology: Towards integrated knowledge of ecosystems, J.-F. Le Galliard, J.-M. Guarini, and F. Gaill [Eds], CNRS, Institut Ecologie et Environnement, France, pp. 227-242. (Get PDF reprint)
  • Uitz, J., D. Stramski, B. Gentili, F. D'Ortenzio, and H. Claustre (2012), Estimates of phytoplankton class-specific and total primary production in the Mediterranean Sea from satellite ocean color observations, Global Biogeochemical Cycles, 26, GB2024, doi:10.1029/2011GB004055. (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)
  • Brewin, R.J.W., N.J. Hartman-Mountford, S.J. Lavender, D.E. Raitsos, T. Hirata, J. Uitz, E. Devred, A. Bricaud, A.M. Ciotti and B. Gentili (2011). An intercomparison of bio-optical techniques for detecting dominant phytoplankton size class from satellite remote sensing. Remote Sensing of Environment, 115, 325–339. (Get PDF Reprint)
  • Saba V.S., M.A. M. Friedrichs, D.Antoine, R.A. Armstrong, I.Asanuma, M.J. Behrenfeld, A.M. Ciotti, M.Dowell, N. Hoepffner, K.J. W. Hyde, J. Ishizaka, T. Kameda, J. Marra, F. Mélin, A. Morel, J.O’Reilly, M. Scardi, W.O. Smith Jr., T.J. Smyth, S. Tang, J. Uitz, K. Waters, T.K. Westberry, 2011, An evaluation of ocean color model estimates of marine primary productivity in coastal and pelagic regions across the globe, Biogeosciences, 8, 489–503. (Get PDF Reprint)
  • 2010

  • Claustre, H., Bishop, J., Boss, E., Stewart, B., Berthon, J.-F., Coatanoan, C., Johnson, K., Lotiker, A., Ulloa, O., Perry, M.-J., D'Ortenzio, F., Hembise Fanton D’Andon, O. & J. Uitz (2010). "Bio-Optical Profiling Floats as New Observational Tools for Biogeochemical and Ecosystem Studies: Potential Synergies with Ocean Color Remote Sensing." in Proceedings of OceanObs’09: Sustained Ocean Observations and Information for Society (Vol. 2), Venice, Italy, 21-25 September 2009, Hall, J., Harrison, D.E. & Stammer, D., Eds., ESA Publication WPP-306, doi:10.5270/OceanObs09.cwp.17 (Get PDF reprint)
  • Saba V.S., M A. M. Friedrichs, M.E. Carr, D. Antoine , R. A. Armstrong, I. Asanuma, O. Aumont, N.R. Bates, M.J. Behrenfeld , V. Bennington, L.Bopp, J.Bruggeman, E.T. Buitenhuis, M.J. Church, A.M. Ciotti, S.C. Doney, M.Dowell, J.Dunne, S.Dutkiewicz , W.Gregg, N.Hoepffner, K.J. W. Hyde, J.Ishizaka , T. Kameda, D.M. Karl, I.Lima, M.W. Lomas, J.Marra , G.A. McKinley, F.Mélin, J. K.Moore, A.Morel, J.O’Reilly , B. Salihoglu, M. Scardi, T.J. Smyth, S.Tang, J.Tjiputra, J. Uitz , M.Vichi, K.Waters, T.K. Westberry and A.Yool (2010). The challenges of modeling depth-integrated marine primary productivity over multiple decades: A case study at BATS and HOT, Global Biogeochemical Cycles, 24, GB3020, doi:10.1029/2009GB003655. (Get PDF Reprint)
  • Uitz, J., Claustre, H., Gentili, B. and D. Stramski (2010). Phytoplankton class-specific primary production in the world’s oceans: Seasonal and interannual variability from satellite observations. Global Biogeochemical Cycles, Vol. 24, No. 3, GB3016, doi: 10.1029/2009GB003680. (Get PDF Reprint)
  • Uitz, J., D. Stramski, A.-C. Baudoux, R. A. Reynolds, V. M. Wright, J. Dubranna, and F. Azam (2010), Variations in the optical properties of a particle suspension associated with viral infection of marine bacteria, Limnology and Oceanography, 55(6), 2317-2330. (Get PDF Reprint)
  • 2009

  • Liu, H., Probert, I., Uitz, J., Claustre, H., Aris-Brosou,S., Frada, M., Not, F. and C. de Vargas (2009). Haptophyta rule the waves: Extreme oceanic biodiversity in non-calcifying prymnesiophytes explains the 19-Hex paradox. Proceedings of the National Academy of Science, doi/10.1073/pnas.0905841106 (Get PDF Reprint) (sup. material)
  • 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

  • Belviso, S., L. Bopp, J. Mosseri, M. Tedetti, N. Garcia, B. Griffiths, F. Joux, I. Obernosterer, J. Uitz, and M. J. W. Veldhuis (2008). Effect of natural iron fertilisation on the distribution of DMS and DMSP in the Indian sector of the Southern Ocean, Deep-Sea Research Part Ii-Topical Studies in Oceanography, 55(5-7), 893-900.
  • Brussaard, C. P. D., K. R. Timmermans, J. Uitz, and M. J. W. Veldhuis (2008), Virioplankton dynamics and virally induced phytoplankton lysis versus microzooplankton grazing southeast of the Kerguelen (Southern Ocean), Deep-Sea Research II, 55(5-7): 752-765. (Get PDF Reprint)
  • 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
  • Silió-Calzada, A., Bricaud, A., Uitz, J. and B. Gentili (2008). Estimation of new primary production in the Benguela upwelling area, using ENVISAT satellite data and a model dependant on the phytoplankton community size structure. Journal of Geophysical Research, 113, C11023, doi:10.1029/2007JC004588, (Get PDF Reprint).
  • Timmermans, K. R., H. J. van der Woerd, M. R. Wernand, M. Sligting, J. Uitz, and H. J. W. de Baar (2008), In situ and remote-sensed chlorophyll fluorescence as indicator of the physiological state of phytoplankton near the Isles Kerguelen (Southern Ocean), Polar Biology, 31(5), 617-628.
  • Uitz, J., Huot, Y., Bruyant, F., Babin, M. and H. Claustre (2008) Relating phytoplankton photophysiological properties to community structure on large scale, Limnology and Oceanography, 53(2), 614-630 (Get PDF Reprint).
  • 2007

  • Blain S., B. Quéguiner, L. K. Armand, S. Belviso, B. Bombled, L. Bopp, A. Bowie, C. Brunet, C. P. D. Brussaard, F. Carlotti, U. Christaki, A. Corbière, I. Durand, F. Ebersbach, J. L. Fuda, N. Garcia, L. Gerringa, F. B. Griffiths, C. Guigue, C. Guillerm, S. Jacquet, C. Jeandel, P. Laan, D. Lefèvre, C. Lomonaco, A. Malits, J. Mosseri, I. Obernosterer, Y. H. Park, M. Picheral, P. Pondaven, T. Remenyi, V. Sandroni, G. Sarthou, N. Savoye, L. Scouarnec, M. Souhaut, D. Thuiller, K. R. Timmermans, T. W. Trull, J. Uitz, P. van-Beek, M. J. W. Veldhuis, D. Vincent, E. Viollier, L. Vong, and T. Wagener (2007), Impact of natural iron fertilization on carbon sequestration in the Southern Ocean, Nature, 446: 1070-1075. (Get PDF Reprint).
  • 2006

  • Uitz, J., Claustre, H., Morel, A., Hooker, S. (2006). Vertical distribution of phytoplankton communities in open ocean: an assessment based on surface chlorophyll . Journal of Geophysical Research, 111, (C08005, doi:10.1029/2005JC003207).(Get PDF Reprint).
  • 2005

  • Le Quéré, C. S. P. Harrison, I. C. Prentice, E. T. Buitenhuis, O. Aumont, L. Bopp, H. Claustre, L. Cotrim da Cunha, R. Geider, X. Giraud, C. Klaas, K. E. Kohfeld, L. Legendre, M. Manizza, T. Platt, R. B. Rivkin, S. Sathyendranath, J. Uitz, A. J. Watson and D. Wolf-Gladrow (2005). Ecosystem dynamics based on plankton functional types for global ocean biogeochemistry models, Global Change Biology, 11, 2016–2040, doi: 10.1111/j.1365-2486.2005.01004.x (Get PDF Reprint)
  • Maixandeau, A.,Lefèvre, D.,Karayanni, H.,Christaki, U.,Van wambeke, F.,Thyssen, M.,Denis, M.,Fernández i., F.,Uitz, J.,Leblanc, K. and B. Quéguiner (2005). Microbial community production, respiration, and structure of the microbial food web of an ecosystem in the northeastern Atlantic Ocean. Journal of Geophysical research, 110, C07S17, doi:10.1029/2004JC00269 (Get PDF Reprint)
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