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Inherent optical properties and satellite retrieval of chlorophyll concentration in the lagoon and open ocean waters of New Caledonia

The retrieval of chlorophyll-a concentration from remote sensing reflectance (Rrs) data was tested with the NASA OC4v4 algorithm on the inner New Caledonian lagoon (Case 2) and adjacent open ocean (Case 1) waters. The input to OC4v4 was Rrs measured in situ or modeled from water’s inherent optical p...

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Published in:Marine pollution bulletin 2010-01, Vol.61 (7-12), p.503-518
Main Authors: Dupouy, Cécile, Neveux, Jacques, Ouillon, Sylvain, Frouin, Robert, Murakami, Hiroshi, Hochard, Sébastien, Dirberg, Guillaume
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creator Dupouy, Cécile
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description The retrieval of chlorophyll-a concentration from remote sensing reflectance (Rrs) data was tested with the NASA OC4v4 algorithm on the inner New Caledonian lagoon (Case 2) and adjacent open ocean (Case 1) waters. The input to OC4v4 was Rrs measured in situ or modeled from water’s inherent optical properties (2001–2007). At open ocean stations, backscattering and absorption coefficients were correlated with chlorophyll (R2=0.31–0.51, respectively), in agreement with models for Case 1 waters. Taking spectrofluorometric measurement as reference, the OC4v4 model leads to an average underestimation of 33% of the chlorophyll concentration. For the lagoon waters, OC4v4 performed inadequately because the backscattering coefficient, highly correlated with turbidity and suspended matter (R2=0.98), was poorly correlated to chlorophyll (R2=0.42). The OC4v4 performance was better in deep lagoon waters for stations with a TDT index (Tchla×depth/turbidity) higher than 19mgm−2 NTU−1 (R2=0.974, bias=10.2%). Global Imager Rrs provided a good estimate of Tchla (R2=0.79, N=28) in the deeper part of the lagoon.
doi_str_mv 10.1016/j.marpolbul.2010.06.039
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ispartof Marine pollution bulletin, 2010-01, Vol.61 (7-12), p.503-518
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1879-3363
language eng
recordid cdi_hal_primary_oai_HAL_hal_00787679v1
source ScienceDirect Journals
subjects Absorption
Algorithms
Backscattering
Bio-optical model
Bio-optical properties
Chlorophyll
Chlorophyll - analysis
Earth Sciences
Ecosystem
Environmental Monitoring
Lagoon
Marine
New Caledonia
OC4v4 algorithm
Ocean color
Oceanography
Optical Phenomena
Pacific Ocean
Phytoplankton
Remote sensing reflectance
Satellite Communications
Sciences of the Universe
Seawater - analysis
Trichodesmium
title Inherent optical properties and satellite retrieval of chlorophyll concentration in the lagoon and open ocean waters of New Caledonia
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