Observing mixed layer depth, nitrate and chlorophyll concentrations in the northwestern Mediterranean: A combined satellite and NO 3 profiling floats experiment

Type Article
Date 2014-09-28
Language English
Author(s) D'Ortenzio Fabrizio1, 2, Lavigne Heloise1, 2, Besson Florent1, 2, Claustre Herve1, 2, Coppola Laurent1, 2, Garcia Nicole3, Laes-Huon Agathe4, Le Reste Serge4, Malarde Damien5, Migon Christophe1, 2, Morin Pascal6, Mortier Laurent1, 7, Poteau Antoine1, 2, Prieur Louis1, 2, Raimbault Patrick3, Testor Pierre1, 7
Affiliation(s) 1 : Univ Paris 06, Univ Paris 04, UMR 7093, LOV,Observ Oceanol, Villefranche Sur Mer, France.
2 : CNRS, UMR 7093, LOV, Observ Oceanol, Villefranche Sur Mer, France.
3 : Univ Aix Marseille 2, MIO, CNRS, Marseille, France.
4 : IFREMER, RDT, Rech & Dev Technol Elect Informat & Mesures Situ, EIM, Plouzane, France.
5 : Nke Instrumentat, Hennebont, France.
6 : IPEV, ZI Pointe Diable, Plouzane, France.
7 : Sorbonne Universités (UPMC, Université Paris 06)-CNRS-IRD-MNHN, LOCEAN, Paris, France
Source Geophysical Research Letters (0094-8276) (Amer Geophysical Union), 2014-09-28 , Vol. 41 , N. 18 , P. 6443-6451
DOI 10.1002/2014GL061020
WOS© Times Cited 48
Keyword(s) Bio-Argo, Mediterranean, mixed layer, bloom onset, nitrate concentration, ocean color satellite
Abstract Two profiling floats, equipped with nitrate concentration sensors were deployed in the northwestern Mediterranean from summer 2012 to summer 2013. Satellite ocean color data were extracted to evaluate surface chlorophyll concentration at float locations. Time series of mixed layer depths and nitrate and chlorophyll concentrations were analyzed to characterize the interplay between the physical-chemical and biological dynamics in the area. Deep convection (mixed layer depth > 1000 m) was observed in January–February, although high-nitrate surface concentrations could be already observed in December. Chlorophyll increase is observed since December, although high values were observed only in March. The early nitrate availability in subsurface layers, which is likely due to the permanent cyclonic circulation of the area, appears to drive the bloom onset. The additional nitrate supply associated to the deep convection events, although strengthening the overall nitrate uptake, seems decoupled of the December increase of chlorophyll.
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Publisher's official version 9 2 MB Open access
Auxiliary Material 5 166 KB Open access
Table S1 1 43 KB Open access
Table S2 1 47 KB Open access
Figure 1 1 37 KB Open access
Figure 2 1 28 KB Open access
Figure 3 1 26 KB Open access
Figure 4 1 23 KB Open access
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D'Ortenzio Fabrizio, Lavigne Heloise, Besson Florent, Claustre Herve, Coppola Laurent, Garcia Nicole, Laes-Huon Agathe, Le Reste Serge, Malarde Damien, Migon Christophe, Morin Pascal, Mortier Laurent, Poteau Antoine, Prieur Louis, Raimbault Patrick, Testor Pierre (2014). Observing mixed layer depth, nitrate and chlorophyll concentrations in the northwestern Mediterranean: A combined satellite and NO 3 profiling floats experiment. Geophysical Research Letters, 41(18), 6443-6451. Publisher's official version : https://doi.org/10.1002/2014GL061020 , Open Access version : https://archimer.ifremer.fr/doc/00211/32225/