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Article Dans Une Revue Global Biogeochemical Cycles Année : 2012

Estimates of phytoplankton class-specific and total primary production in the Mediterranean Sea from satellite ocean color observations

Résumé

An approach that combines a recently developed procedure for improved estimation of surface chlorophyll a concentration (Chl surf) from ocean color and a phytoplankton class-specific bio-optical model was used to examine primary production in the Mediterranean Sea. Specifically, this approach was applied to the 10 year time series of satellite Chl surf data from the Sea-viewing Wide Field-of-view Sensor. We estimated the primary production associated with three major phytoplankton classes (micro, nano, and picophytoplankton), which also yielded new estimates of the total primary production (P tot). These estimates of P tot (e.g., 68 g C m À2 yr À1 for the entire Mediterranean basin) are lower by a factor of $2 and show a different seasonal cycle when compared with results from conventional approaches based on standard ocean color chlorophyll algorithm and a non-class-specific primary production model. Nanophytoplankton are found to be dominant contributors to P tot (43-50%) throughout the year and entire basin. Micro and picophytoplankton exhibit variable contributions to P tot depending on the season and ecological regime. In the most oligotrophic regime, these contributions are relatively stable all year long with picophytoplankton ($32%) playing a larger role than microphytoplankton ($22%). In the blooming regime, picophytoplankton dominate over microphytoplankton most of the year, except during the spring bloom when microphytoplankton (27-38%) are considerably more important than picophytoplankton (20-27%).
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hal-03137464 , version 1 (10-02-2021)

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Julia Uitz, Dariusz Stramski, Bernard Gentili, Fabrizio d'Ortenzio, Hervé Claustre. Estimates of phytoplankton class-specific and total primary production in the Mediterranean Sea from satellite ocean color observations. Global Biogeochemical Cycles, 2012, 26 (2), pp.n/a-n/a. ⟨10.1029/2011GB004055⟩. ⟨hal-03137464⟩
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