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Remotely sensed seasonal dynamics of phytoplankton in the Ligurian Sea in 1997-1999

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Nezlin, NP Lacroix, G. Kostianoy, AG Djenidi, S

[1] Remotely sensed data and a one-dimensional hydrophysical model were used to study the seasonal dynamics of surface plant pigments concentration in the Ligurian-Provencal basin. The variations of phytoplankton biomass were estimated from the observations of the Coastal Zone Color Scanner ( 1978 - 1986) and Sea-viewing Wide Field-of-view Sensor (SeaWiFS) ( September 1997 to October 1999) radiometers. The factors of physical environment analyzed included remotely sensed sea surface temperature ( from advanced very high resolution radiometers), wind, air temperature, and atmospheric precipitation. The Geohydrodynamics and Environment Research (GHER) model was used to explain the observed correlations between the physical forcing and the response of phytoplankton biomass. The general pattern of phytoplankton seasonal dynamics was typical to subtropical areas: maximum biomass during cold season from October to April and low biomass during summer months. The intensity of winter/spring bloom significantly varied during different years. The correlation was revealed between the summer/autumn air temperature contrast ( expressed as the difference between the air temperatures in August and in November) and the maximum monthly averaged surface chlorophyll concentration during the subsequent winter/spring bloom. The features of seasonal dynamics of phytoplankton are regulated by the physical impacts influencing water stratification. The difference between two seasonal cycles ( from September 1997 to October 1999) illustrates the response of phytoplankton growth to local meteorological conditions. In March - April 1999 the vernal bloom was much more pronounced; it resulted from deeper winter cooling and more intensive winter convection. Heating of surface water layer, wind mixing, and freshwater load with rains and river discharge either stimulate or depress the development of phytoplankton, depending on what limiting environmental factor ( light or nutrient limitation) prevailed.

Document type Article de périodique (Journal article) – Article de recherche
Publication date 2004
Language Anglais
Journal information "Journal of Geophysical Research" - Vol. 109, no. C7 (2004)
Peer reviewed yes
Publisher Amer Geophysical Union (Washington)
issn 0148-0227
Publication status Publié
Affiliation UCL
Keywords SeaWiFS ; seasonal dynamics ; Ligurian Sea
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Bibliographic reference Nezlin, NP ; Lacroix, G. ; Kostianoy, AG ; Djenidi, S. Remotely sensed seasonal dynamics of phytoplankton in the Ligurian Sea in 1997-1999. In: Journal of Geophysical Research, Vol. 109, no. C7 (2004)
Permanent URL http://hdl.handle.net/2078.1/40072