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PhD position in Mediterranean Mercury Modeling, LSCE & MIO, France


The Laboratory of Climate and Environmental Sciences (LSCE, Paris, France) and the Mediterranean Institute of Oceanography (MIO, Marseilles, France) are offering a

PhD Position

Topic: Modeling the biogeochemical mercury cycle in the Mediterranean Sea.

Starting on October 1st 2018

Job Description / Duties

The Mediterranean Sea is under the influence of anthropogenic emissions and changing climate, both affecting the biogeochemical mercury cycle. This oligotrophic basin, limited by macronutrients (P, N), mainly receives supply via atmospheric deposition, upwelling of deep waters and rivers.

The PhD objective is to investigate the impact of climate change and atmospheric forcing on the Mediterranean Sea and its marine biogeochemistry. The strategy is based on the use and analysis of 3D atmospheric and oceanic models, especially the regional coupled NEMOMed-PISCES model that simulates the dynamics and biogeochemical cycles of the Mediterranean at high resolution (1/12°). This study is part of the national MISTRALS and the international GEOTRACES programs.

Firstly, we will study the evolution of the biogeochemical cycling according to different IPCC climate change scenarios. We will simulate the response of the changes in forcing (temperature, circulation), nutrient supply (atmospheric dust deposition, rivers), and nutrient redistribution (circulation) on primary production, and the first trophic levels (phyto- and zooplankton). The numerical modeling efforts will be supported by recently acquired in situ observations, including a Saharan dust event, aduring the 2017 GEOTRACES PEACETIME cruise.

Secondly, we will attempt to simulate for the first time the complex biogeochemical cycle of mercury (Hg), resolving all Hg species (MMHg, DMHg, Hg°, Hg2+, pHg, pMMHg) in the Mediterranean Sea. Mercury is global pollutant and a neurotoxin with a serious health risk for humans, mainly via the consumption of marine fish. Anthropogenic Hg emissions have largely altered natural Hg levels. Bacteria feeding on sinking marine organic matter in the mesopelagic zone are thought to produce the toxic methylmercury species (MMHg) that bioaccumulates along the marine trophic chain to harmful levels. The direct links of anthropogenic Hg emissions and changing climate to marine fish Hg levels, and ultimately human exposure remain ill-understood.

The Mediterranean Sea is one of the best covered areas in terms of observational Hg data (Cossa et al. 1991, 1994, 1997, 2017a,b, Horvat et al. 2003, 2005, Kotnik et al. 2007, 2009, Heimbürger et al. 2010). The data comprises over 800 data points and the new data acquired during the 2017 GEOTRACES PEACETIME cruise added another 200 data points. The wealth of observational Hg data and the well-studied circulation and biogeochemistry (MERMEX group, 2011) make the Mediterranean Sea the ideal place to implement marine biogeochemical models (Ayache et al., 2016).

The PhD student will based at the Laboratoire du Sciences du Climat et d’Environnement (LSCE) and collaborate intensely with the Mediterranean Institute of Oceanography (MIO) in Marseilles, France. S/he will help with the validation and interpretation of all acquired data and be in charge of the implementation of the data into numerical models. The PhD student will be lead author of at least 2 publications. Although the data for PhD project is already acquired, the student will be given the opportunity to learn about the observational aspects, ultra-trace clean techniques, participate to field campaigns.

Qualification

A qualification comparable to a Master's degree or Diploma in (chemical) oceanography, environmental chemistry, or related field is required. Experience in programming and numerical modeling is a requirement, and notations in marine biogeochemistry are desirable. An essential requirement for selection for the PhD projects is a top-quality MSc or equivalent 5 year degree. We also expect good English language skills.

Applications including a letter of motivation, CV and contact details of 3 referees should be sent to jean-claude.dutay@lsce.ipsl.fr and lars-eric.heimburger@mio.osupytheas.fr as a single pdf file, using as subject "MED Hg modeling".

Dr. Jean-Claude Dutay
SCE, IPSL/CEA, UVSQ, CNRS, University Paris-Saclay, Gif sur Yvette, France

Dr. Lars-Eric Heimbürger
Mediterranean Institute of Oceanography, Aix Marseille University, CNRS/INSU, Université de Toulon, IRD, UM 110, 13288, Marseille, France

Evaluation will close end of April.

References

Ayache, M., J. C. Dutay, T. Arsouze, S. Révillon, J. Beuvier and C. Jeandel (2016). "High-resolution neodymium characterization along the Mediterranean margins and modelling of εNd distribution in the Mediterranean basins." Biogeosciences 13(18): 5259-5276.

Cossa, D., B. Averty and N. Pirrone (2009). "The origin of methylmercury in open Mediterranean waters." Limnology and Oceanography 54(3): 837-844.

Cossa, D. and M. Coquery, Eds. (2005). The Mediterranean Mercury Anomaly, a Geochemical or a Biological Issue. The Mediterranean Sea. Berlin-Heidelberg, Springer.

Cossa, D., X. Durrieu de Madron, J. Schäfer, S. Guédron, N. Marusczak, S. Castelle and J.-J. Naudin (2017). "Sources and exchanges of mercury in the waters of the Northwestern Mediterranean margin." Progress in Oceanography.

Cossa, D., X. Durrieu de Madron, J. Schäfer, L. Lanceleur, S. Guédron, R. Buscail, B. Thomas, S. Castelle and J.-J. Naudin (2017). "The open sea as the main source of methylmercury in the water column of the Gulf of Lions (Northwestern Mediterranean margin)." Geochimica et Cosmochimica Acta 199(Supplement C): 222-237.

Cossa, D. and J.-M. Martin (1991). "Mercury in the Rhône delta and adjacent marine areas." Marine Chemistry 36(1–4): 291-302.

Cossa, D., J. M. Martin and J. Sanjuan (1994). "Dimethylmercury Formation in the Alboran Sea." Marine Pollution Bulletin 28(6): 381-384.

Cossa, D., J. M. Martin, K. Takayanagi and J. Sanjuan (1997). "The distribution and cycling of mercury species in the western Mediterranean." Deep-Sea Research II 44(3-4): 721-740.

Durrieu de Madron, X., C. Guieu, R. Sempéré, P. Conan, D. Cossa, F. D’Ortenzio, C. Estournel, F. Gazeau, C. Rabouille, L. Stemmann, S. Bonnet, F. Diaz, P. Koubbi, O. Radakovitch, M. Babin, M. Baklouti, C. Bancon-Montigny, S. Belviso, N. Bensoussan, B. Bonsang, I. Bouloubassi, C. Brunet, J. F. Cadiou, F. Carlotti, M. Chami, S. Charmasson, B. Charrière, J. Dachs, D. Doxaran, J. C. Dutay, F. Elbaz-Poulichet, M. Eléaume, F. Eyrolles, C. Fernandez, S. Fowler, P. Francour, J. C. Gaertner, R. Galzin, S. Gasparini, J. F. Ghiglione, J. L. Gonzalez, C. Goyet, L. Guidi, K. Guizien, L. E. Heimbürger, S. H. M. Jacquet, W. H. Jeffrey, F. Joux, P. Le Hir, K. Leblanc, D. Lefèvre, C. Lejeusne, R. Lemé, M. D. Loÿe-Pilot, M. Mallet, L. Méjanelle, F. Mélin, C. Mellon, B. Mérigot, P. L. Merle, C. Migon, W. L. Miller, L. Mortier, B. Mostajir, L. Mousseau, T. Moutin, J. Para, T. Pérez, A. Petrenko, J. C. Poggiale, L. Prieur, M. Pujo-Pay, V. Pulido, P. Raimbault, A. P. Rees, C. Ridame, J. F. Rontani, D. Ruiz Pino, M. A. Sicre, V. Taillandier, C. Tamburini, T. Tanaka, I. Taupier-Letage, M. Tedetti, P. Testor, H. Thébault, B. Thouvenin, F. Touratier, J. Tronczynski, C. Ulses, F. Van Wambeke, V. Vantrepotte, S. Vaz and R. Verney (2011). "Marine ecosystems’ responses to climatic and anthropogenic forcings in the Mediterranean." Progress in Oceanography 91(2): 97-166.

Heimbürger, L. E., D. Cossa, J.-C. Marty, C. Migon, B. Averty, A. Dufour and J. Ras (2010). "Methylmercury distributions in relation to the presence of nano- and picophytoplankton in an oceanic water column (Ligurian Sea, North-western Mediterranean)." Geochimica Et Cosmochimica Acta 74(19): 5549-5559.

Horvat, M., J. Kotnik, M. Logar, V. Fajon, T. Zvonaric and N. Pirrone (2003). "Speciation of mercury in surface and deep-sea waters in the Mediterranean Sea." Atmospheric Environment 37(Supplement 1): 93-108.

Kotnik, J., M. Horvat, E. Tessier, N. Ogrinc, M. Monperrus, D. Amouroux, V. Fajon, D. Gibicar, S. Zizek, F. Sprovieri and N. Pirrone (2007). "Mercury speciation in surface and deep waters of the Mediterranean Sea." Marine Chemistry 107(1): 13-30.

Graduate student positions – Trace metal biogeochemistry – Texas A&M Oceanography

The Fitzsimmons Lab in trace metal biogeochemistry in the Department of Oceanography at Texas A&M University seeks creative and motivated graduate students at the Masters and/or PhD level to join the lab in Fall 2018. Our research explores the distribution, physicochemical speciation, and isotope ratios of trace metals in seawater in order to better understand the cycling and biological usage of essential micronutrient and contaminant metals in the oceans. We are a sea-going group, collecting our samples on research cruises and then analyzing them back in the laboratory. Our primary analytical tool is inductively coupled plasma mass spectrometry (ICP-MS), which is housed in the Williams Radiogenic Laboratory in the College of Geosciences at Texas A&M.

Potential research projects include (but are not limited to) 1) processes controlling distributions of dissolved and colloidal metals on the U.S. GEOTRACES Pacific Meridional cruise; 2) the development of x-ray synchrotron methods to explore the physicochemical speciation of colloidal iron in marine and coastal waters; 3) the measurement of toxic heavy metals transport to coastal Texas waters in Galveston Bay and the Gulf of Mexico; and 4) the measurement of iron stable isotope ratios in seawater to gain knowledge of the source and/or processes modulating metal distributions in the oceans (Antarctic and Pacific samples). Opportunities for participation in oceanographic cruises will be available and encouraged.

Students should have a strong background in one or more of the following disciplines: chemistry, biogeochemistry, oceanography, and/or earth science. Strong chemistry skills, excellent written and oral communication in English, and enthusiasm are required. Experience on oceanographic research cruises, in clean labs, and/or with ICP-MS is desirable.

**Application process**

Interested and qualified candidates should send an email describing their motivation and research interests along with a CV to Dr. Jessica Fitzsimmons <jessfitzsimmons@gmail.com>. Formal graduate applications to Texas A&M Oceanography are due January 1st, 2018. Financial support for graduate students is available from research assistantships, teaching assistantships, and university fellowships. Application to outside funding sources is also encouraged.

*About Texas A&M Oceanography*

Texas A&M University is a top-100 university located in College Station, TX, between the metropolitan cities of Austin and Houston, TX. It is a land-, sea-, and space-grant university with a dynamic and international community of 172,000 people situated on 5200 acres of land. Oceanography graduate faculty are housed primarily in College Station, with associated scientists and graduate students also on the Galveston campus. The more than 30 faculty and 60 graduate students in Oceanography sail across the world to learn more about the ocean’s physical, geological, chemical and biological properties. The academic curriculum emphasizes an interdisciplinary approach to discovering the connection between the oceans’ past, present, and future. Research ranges from monitoring the hypoxic levels and algal blooms of the Texas Gulf Coast to the understanding the influence of climate change on the fragile ecosystems of the Arctic and Antarctic. The department also maintains close ties with the Geochemical and Environmental Research Group (GERG), which is an applied research group that serves to link academic education and research to the real-world needs of government and industry. GERG expertise includes buoy design, fabrication, deployment, ocean monitoring and modeling, as well as environmental contaminant assessments of soil, water, air and organisms. The Oceanography department also works closely with the rest of the Texas A&M College of Geosciences, which includes the Departments of Atmospheric Sciences, Geology and Geophysics, and Geography, the Berg-Hughes Center for Petroleum Sedimentary Systems, the Integrated Ocean Discovery Program (IODP), and Texas Sea Grant. Altogether this School includes >100 research faculty, >200 research and administrative staff, and >350 graduate students.

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