Météo-France invites application for a postdoctoral position on the topic of "Remote sensing of Sargassum macroalgae".
Location: France, Brittany, Lannion
The postdoctoral position is to join the CEMS team of the CNRM laboratory (http://www.umr-
cnrm.fr/). CNRM is the research laboratory of Météo-France (the French meteorological service) and
contributes through the CEMS team to the observation of ocean, atmosphere and cloud through
spaceborne remote sensing techniques.
In the last decade, Sargassum (brown algae) proliferation has become a major concern in the West
Indies region with significant impacts on public health, environment and local economy. So much so that
Météo-France has been commissioned by the French Ministry for the Ecological and Inclusive Transition
to provide operational bulletins of Sargassum stranding forecasts to the authorities of the French Islands
in the West Indies. From a scientific point of view, there are two main aspects to achieve this request:
Sargassum detection using satellite remote sensing techniques and trajectory forecasting using a drift
model. The postdoctoral position offered is focussed on the detection aspect.
Satellite remote sensing methods already exist for Sargassum detection, they are based on spectral
indices using visible to near infrared bands available on medium to high resolution sensors currently flying
on a number of satellites for instance MODIS on board Aqua and Terra, OLCI on board Sentinel-3A and
3B or MSI on board Sentinel-2A and 2B.
The objective of the open position is to scientifically contribute to seting up the future operational service
of Sagassum detection at Meteo-France. This includes several tasks:
1. Implement and verify existing algorithm to compute relevant indices (including algorithm
correction) and understand their limitations in the context of forecasting the stranding of
2. Carry out research to improve the current methodologies: attention will focus on false detections
and misses of Sargassum raft (due to cloud coverage mostly).
3. Carry out research to adapt the methodologies to other sensors if relevant.
More information on the proposition and how to apply:
SAUX PICART Stéphane, PhD
Météo-France - CNRS, CNRM UMR3589
Centre d’Études en Météorologie Satellitaire
Satellite Meteorology Research Center
Avenue de Lorraine
22307 Lannion cedex, France
tel : +33 (0)2 96 05 67 07
fax : +33 (0)2 96 05 67 37