Title: Optically Black Waters in the Northern Baltic Sea
Authors: BERTHON Jean-FrancoisZIBORDI Giuseppe
Citation: GEOPHYSICAL RESEARCH LETTERS vol. 37 no. 9 p. L09605, 6 PP.
Publisher: AMER GEOPHYSICAL UNION
Publication Year: 2010
JRC Publication N°: JRC57806
ISSN: 0094-8276
URI: http://www.agu.org/pubs/crossref/2010/2010GL043227.shtml
http://publications.jrc.ec.europa.eu/repository/handle/JRC57806
DOI: 10.1029/2010GL043227
Type: Articles in Journals
Abstract: The peculiar bio-optical properties of the northernmost waters of the Baltic Sea (Bothnian Sea and Bay of Bothnia) are illustrated by exploiting unique in situ measurements of apparent and inherent optical properties collected in 2007. Specifically, this study shows that the high values of absorption by colored dissolved organic matter (ays(412) around 1.4 m^-1) resulting from the presence of humic matter brought by the numerous Swedish and Finnish rivers alimenting the basin are not correlated with high concentrations of particles as generally observed in the southern Baltic Sea. As a consequence, extremely low values (i.e., less than 0.5) of the ratio of scattering to absorption are observed in the blue spectral region. The corresponding spectra of normalized water leaving radiance are close to satisfy the ¿black pixel¿ assumption in the blue and even in the green part of the visible spectrum. Consequently, the Bothnian Sea and most of all the Bay of Bothnia, appear ideal candidates for studies on atmospheric corrections and vicarious calibration of ocean color sensors in coastal waters.
JRC Institute:Institute for Environment and Sustainability

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