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Theses

Étude de la distribution des principaux groupes de
phytoplancton par télédétection satellitaire:
Développement de la méthode PHYSAT à partir des données GeP&CO et application à l'archive SEAWIFS entre 1998 et 2004.

Abstract : Phytoplankton plays an important role in the carbon cycle in the ocean. Ocean color sensors allow for more than 20 years a quasi-daily monitoring of the surface concentration in phytoplankton. These data are used to quantify the “ocean biological pump” of carbon. However, the efficiency of this « biological pump » strongly depends on the phytoplankton group present in surface waters. Distinguishing dominant phytoplankton groups from remote sensing was thus one of the major challenges of ocean color at the beginning of my PhD.
During my PhD, I used an empirical approach to derive relationship between SeaWiFS spectral measurements and dominant phytoplankton groups by using a large set of quantitative inventories of phytoplankton pigments collected during GeP&CO cruises between France and New Caledonia (10/1999 - 07/2002). I have shown that four major phytoplankton groups, ie. Haptophytes, Prochlorococcus, Synechococcus-like cyanobacteria and diatoms can be detected from their spectral signatures and that three additional ones can also likely be detected (Trichodesmiums, Phaeocystis, Coccolithophorids). This classification, named PHYSAT, has been applied to all daily SeaWiFS data from 1997 to 2004. These results bring for the first time information about the space and time distribution of main phytoplankton groups at the global scale.
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https://tel.archives-ouvertes.fr/tel-00157372
Contributor : Severine Alvain <>
Submitted on : Tuesday, June 26, 2007 - 10:03:18 AM
Last modification on : Monday, November 16, 2020 - 1:10:06 PM
Long-term archiving on: : Monday, September 24, 2012 - 10:30:10 AM

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Séverine Alvain. Étude de la distribution des principaux groupes de
phytoplancton par télédétection satellitaire:
Développement de la méthode PHYSAT à partir des données GeP&CO et application à l'archive SEAWIFS entre 1998 et 2004.. Climatologie. Université Paris-Diderot - Paris VII, 2005. Français. ⟨tel-00157372⟩

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