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Title: Spectral measurements of underwater downwelling radiance of inland water bodies
Authors: Potes, Miguel
Costa, Maria João
Salgado, Rui
Bortoli, Daniele
Serafim, António
Le Moigne, Patrick
Keywords: underwater spectral measurements
Water quality
Issue Date: Nov-2013
Publisher: International Meteorological Institute in Stockolm
Citation: Potes, M, M. J. Costa, R. Salgado, D. Bortoli, A. Serafim, and P. Le Moigne. Spectral measurements of underwater downwelling radiance of inland water bodies. Tellus A 2013, 65, 20774,
Abstract: The apparatus exploited in this work is composed of an optical cable linked to a portable FieldSpec UV/VNIR that records the spectral downwelling radiance in underwater environment, allowing us to calculate the shortwave attenuation coefficient in water. Results for three inland water bodies are presented under different atmospheric conditions (sun zenith angle and wind speed) and water composition (chlorophyll α concentration and turbidity). We show that the spectral downwelling zenith radiance profiles under high sun elevations present a positive slope in the upper layers due to relatively high scattering of direct sunlight compared to attenuation. For deeper layers, attenuation overcomes the scattering of sunlight leading to a constant negative logarithmic slope. For low sun elevations, a negative slope is observed in the entire water column since the scattering of direct sunlight is always lower than attenuation. Whenever a negative logarithmic constant slope is observed, the attenuation coefficient was computed. A relation was observed between attenuation coefficient in the photosynthetically active radiation (PAR) spectral region and water turbidity, for the three water bodies under study.
Type: article
Appears in Collections:FIS - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica
CGE - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica

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