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

Type Article
Date 2011
Language English
Author(s) Minghelli-Roman Audrey1, Laugier ThierryORCID2, Polidori Laurent3, Mathieu Sandrine4, Loubersac Lionel2, Gouton Pierre1
Affiliation(s) 1 : Univ Bourgogne, UMR CNRS 5158, LE2I, F-21078 Dijon, France.
2 : IFREMER, LER LR, F-34203 Sete, France.
3 : ESGT, CNAM, F-72000 Le Mans, France.
4 : Thales Alenia Space, F-06156 Cannes La Bocca, France.
Source International Journal Of Remote Sensing (0143-1161) (Taylor & Francis Ltd), 2011 , Vol. 32 , N. 4 , P. 909-923
DOI 10.1080/01431160903485794
WOS© Times Cited 10
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).
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Minghelli-Roman Audrey, Laugier Thierry, Polidori Laurent, Mathieu Sandrine, Loubersac Lionel, Gouton Pierre (2011). Satellite survey of seasonal trophic status and occasional anoxic 'malaigue' crises in the Thau lagoon using MERIS images. International Journal Of Remote Sensing, 32(4), 909-923. Publisher's official version : , Open Access version :