Satellite survey of seasonal trophic status and occasional anoxic 'malaigue' crises in the Thau lagoon using MERIS images

Audrey Minghelli-Roman 1, 2 Thierry Laugier 3 Laurent Polidori 4 Séverine Mathieu 5 Lionel Loubersac 6 Pierre Gouton 1
1 Le2i - Laboratoire Electronique, Informatique et Image [UMR6303]
2 SIIM - Signal et Image
LIS - Laboratoire d'Informatique et Systèmes
3 LER-LR - Laboratoire Environnement Ressources
4 GeF - Laboratoire Géomatique et foncier
5 III-V Lab - Alcatel-Thalès III-V lab
6 LER/MPL - Laboratoire Laboratoire Environnement Ressources Morbihan Pays de Loire
Abstract : The Thau lagoon, located in southern France, suffers episodically from anoxic crises locally known as 'malaigue'. Such crises mostly occur under warm conditions, low winds leading to a strong eutrophication of the lagoon. The development of a sulphur bacterium sometimes gives locally to the waters a 'milky turquoise' appearance and leads to shellfish mortality. One of the indicators of the eutrophication status of the lagoon can be surveyed by the chlorophyll product provided by remote sensing images such as Medium Resolution Imaging Spectrometer (MERIS). In this paper we compare chl2 (or algal2) estimations provided by MERIS level 2 products and the ground measurements of chlorophyll a concentrations in water and we propose a linear correction of the chl2 MERIS product. The corrected chl2 estimations obtained over four years are analysed to understand the seasonal evolution of the trophic status of the Thau lagoon. We also study the influence of the anoxic crises of summers 2003 and 2006 on the chl2 estimations and we find a strong correlation between chl2 and the oxygen percentage at 1 m depth (0.70 for measurements in summers 2003 and 2006).
Document type :
Journal articles
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https://hal.archives-ouvertes.fr/hal-01859046
Contributor : Audrey Minghelli <>
Submitted on : Tuesday, August 21, 2018 - 3:47:00 PM
Last modification on : Tuesday, January 21, 2020 - 1:53:14 AM

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Audrey Minghelli-Roman, Thierry Laugier, Laurent Polidori, Séverine Mathieu, Lionel Loubersac, et al.. Satellite survey of seasonal trophic status and occasional anoxic 'malaigue' crises in the Thau lagoon using MERIS images. International Journal of Remote Sensing, Taylor & Francis, 2011, 32 (4), pp.909-923. ⟨hal-01859046⟩

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