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5 October 2007 Bio-optical variability in coastal waters of southeast Brazil
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Abstract
The coastal zone is of enormous importance to the environmental, economic, and social well being of nations. It is subject to increasing pressures from many sources, including industrial development, urban expansion, the exploitation of marine resources, and tourism. In order to understand and address the effects of natural and anthropogenic forces in the Southeastern coastal zone of Brazil, time-series of in-situ and satellite-based environmental observations are being developed to account for the interconnectivity of processes within the system. In this work, data collected during December 2004-January 2006 at the ANTARES time series station near Ubatuba, Southeast Brazil (23°44'S and 45°00'W) are analyzed. The data set includes measurements of near-surface chlorophyll-a concentration (CHL), absorption by particles, detritus, and colored dissolved organic matter (CDOM), and above-water hyperspectral reflectance. A triangular diagram, based on the relative contribution to spectral absorption of the optically active constituents, is used to classify the waters, revealing CDOM-dominated Case 2 waters. Seasonal changes in water composition and optical properties are examined. Applying the OC2v4, OC4v4, and OC3M algorithms to the radiometric data, after proper spectral integration, the CHL estimates are generally too high compared with fluorometric determinations, which might be caused by relatively large CDOM absorption at the coastal site.
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Milton Kampel, Salvador A. Gaeta, Joao A. Lorenzzetti, Mayza Pompeu, Frederico M. Rudorff, and Robert J. Frouin "Bio-optical variability in coastal waters of southeast Brazil", Proc. SPIE 6680, Coastal Ocean Remote Sensing, 66800O (5 October 2007); https://doi.org/10.1117/12.737786
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