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by Webmaster Legos last modified Nov 25, 2019 03:37 PM


Postdoc position at LEGOS – Mercator Ocean (Toulouse, France) on Sargassum seasonal forecast


Before 2010, pelagic Sargassum spp. bloomed preferentially in the Sargasso Sea and in the northwestern tropical Atlantic. They are now found in large quantities on the coasts of the Lesser Antilles, Central America, Brazil and West Africa. Satellite imagery reveals that these strandings come from colossal quantities of algae drifting from the central tropical Atlantic between 0 and 10°N, disconnected from the known seeding regions.

Modeling and forecasting the Sargassum strandings is essential for designing effective integrated risk management strategies, and corresponds to a strong and pressing demand from the civil society. This operational challenge concerns both event forecasts (i.e. on a one-week scale) and long-term forecasts (one to several months). While many efforts have been made for short-term forecast, initiatives for reliable long-term forecasting are very scarce and face several scientific obstacles.

The successful candidate will implement a seasonal and mechanistic forecast of the large scale Sargassum distribution over the Tropical Atlantic with a few months in advance. This will rely on the development and skill assessment of a physical-biogeochemical (based on NEMO-PISCES models) seasonal forecast at 1/4o horizontal resolution and the integration of a Sargassum drift and growth in the seasonal prevision.The regional NEMO-PISCES model configuration of the Tropical Atlantic has already been developed at LEGOS.

The successful candidate will share his time between LEGOS ( and Mercator Ocean ( This work will be carried out in a highly collaborative framework involving researchers working on Sargassum physiology and Sargassum teledetection from space (MIO, LIS, LEMAR).

Applicants should have a PhD in physical or biogeochemical oceanography (defended less than 5 years ago) or other similar fields of study. A background in numerical modelling would be a plus and an interest in multidisciplinary approach is necessary. Good programming skills (especially FORTRAN90, Python) are required.
Interested candidates should send their CV, a letter explaining their motivation for the position to: Julien Jouanno (, Marie Helene Radenac () and Yann Drillet ().

The postdoc, funded by IRD (Institut de Recherche pour le Développement), is expected to start between November and December 2019. Review of applications will be made until theposition is filled. The contract will cover a period of one year and will be extended for one year depending on progress.


Postdoc Position at LEGOS (Toulouse, France) on Flow-Topography Interactions in the Gulf of Guinea



As part of the TRIATLAS European project on « South and Tropical Atlantic climate-based marine ecosystem prediction for sustainable management » (, we seek a postdoc candidate to conduct a research work on regional ocean dynamics in the Gulf of Guinea, mostly through numerical modelling.

The Gulf of Guinea is located in the Eastern Tropical Atlantic Ocean. It is a region characterized by strong seasonal ocean dynamics related to the West-African monsoon, large river discharges (Congo, Niger), known or expected flow-topography interactions (capes, islands), unusual coastal upwelling dynamics (off Côte d’Ivoire, Ghana) and overlooked mesoscale variability. All these processes can affect biological productivity.

The successful candidate will study the  interactions of the regional ocean circulation with the equatorial islands of Sao Tomé and Principe, by comparing available high-resolution (1/12°) NEMO regional simulations with and without islands, and preparing complementary simulations to test the sensitivity of other forcings (wind, rivers, tides) to the topography. In particular, the impact of islands will be analyzed in terms of mesoscale eddies generation, and possibly of biogeochemistry by adapting existing coupled NEMO-PISCES physical-biogeochemical simulations.

Applicants should have a PhD in physical oceanography. A background in numerical modeling, good programming skills in Matlab/Python and Fortran are required. An interest in multidisciplinary approach is necessary, and knowledge in biogeochemistry would be appreciated.

Interested candidates should send their CV, a letter explaining their motivations for the position, the name and contact email of 2 references to : Gael Alory (), Isabelle Dadou () and Julien Jouanno ().  

The postdoc, funded by IRD (Institut de Recherche pour le Développement), is expected to start in early 2020. Monthly gross salary will be in the 2500-3100 € range depending on the applicant's experience. Review of applications will be made until the position is filled. The contract will cover a period of 21 months.

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