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Proceedings Paper

MODIS/Aqua chlorophyll monitoring of the New Caledonia lagoon during the 2008 La Nina event
Author(s): Cécile Dupouy; Audrey Minghelli-Roman; Marc Despinoy; Rudiger Röttgers; Jacques Neveux; Christel Pinazo; Michel A. Petit
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Paper Abstract

Tropical oligotrophic coral reef lagoons are areas of high biodiversity. Chlorophyll concentration, a proxy for phytoplankton biomass and primary production, is useful to monitor the carbon balance in the context of the climate change and to validate simulations by coupled biogeochemical models. Chlorophyll monitoring by Aqua/MODIS is examined on the large tropical oligo- to mesotrophic lagoon of New Caledonia (23,900 km2). The classical OC3 algorithm developed for MODIS can only be applied in deep waters. In shallow water, when the water is clear with a weak attenuation, the bottom reflectance influences the surface reflectance and then induces an error in the chlorophyll determination. Here, a new OC3-type polynom, relating satellite reflectance ratios and chlorophyll, was determined from bio-optical data collected during a cruise (Valhybio) on the R/V Alis in the frame of the Programme National de Télédétection Spatiale. From the 22th of March to the 9th of April, data were collected during two surveys of the same network. A total of 170 in situ bio-optical measurements in the South Western and South lagoons of New Caledonia were obtained, within a 2 weeks interval (70 non-cloudy match-ups). Four Modis images were acquired during this cruise with moderate to good atmospheric conditions. The new polynom gives a RMS of 14.8% and a MNB of - 9% and gives a better representation of the "true" water column chlorophyll concentration of the New Caledonia lagoon.

Paper Details

Date Published: 19 December 2008
PDF: 8 pages
Proc. SPIE 7150, Remote Sensing of Inland, Coastal, and Oceanic Waters, 715014 (19 December 2008); doi: 10.1117/12.805310
Show Author Affiliations
Cécile Dupouy, Ctr. Institut de Recherche pour le Développement de Nouméa (New Caledonia)
Univ. de la Méditerranée (France)
Audrey Minghelli-Roman, LE2I, CNRS, Univ. Bourgogne (France)
Marc Despinoy, Ctr. Institut de Recherche pour le Développement de Nouméa (New Caledonia)
Rudiger Röttgers, GKSS (Germany)
Jacques Neveux, LOBB, CNRS, UPMC (Paris VI) (France)
Christel Pinazo, Univ. de la Méditerranée (France)
Michel A. Petit, Ctr. Institut de Recherche pour le Développement de Nouméa (New Caledonia)

Published in SPIE Proceedings Vol. 7150:
Remote Sensing of Inland, Coastal, and Oceanic Waters
Robert J. Frouin; Serge Andrefouet; Hiroshi Kawamura; Mervyn J. Lynch; Delu Pan; Trevor Platt, Editor(s)

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