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Absorption and attenuation of visible and near-infrared light in water: dependence on temperature and salinity

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dc.creator Pegau, W. Scott
dc.creator Gray, Deric
dc.creator Zaneveld, J. Ronald V.
dc.date.accessioned 2012-02-20T20:24:38Z
dc.date.available 2012-02-20T20:24:38Z
dc.date.issued 1997-08-20
dc.identifier.citation W. Scott Pegau, Deric Gray, and J. Ronald V. Zaneveld, "Absorption and attenuation of visible and near-infrared light in water: dependence on temperature and salinity," Applied Optics, 36, 6035-6046 (1997) http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-36-24-6035 en_US
dc.identifier.uri http://hdl.handle.net/1957/27852
dc.description This paper was published in Applied Optics and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/ao/home.cfm. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law. en_US
dc.description.abstract We have measured the absorption coefficient of pure and salt water at 15 wavelengths in the visible and near-infrared regions of the spectrum using WETLabs nine-wavelength absorption and attenuation meters and a three-wavelength absorption meter. The water temperature was varied between 15 and 30 °C, and the salinity was varied between 0 and 38 PSU to study the effects of these parameters on the absorption coefficient of liquid water. In the near-infrared portion of the spectrum the absorption coefficient of water was confirmed to be highly dependent on temperature. In the visible region the temperature dependence was found to be less than 0.001 m⁻¹/°C except for a small region around 610 nm. The same results were found for the temperature dependence of a saltwater solution. After accounting for index-of-refraction effects, the salinity dependence at visible wavelengths is negligible. Salinity does appear to be important in determining the absorption coefficient of water in the near-infrared region. At 715 nm, for example, the salinity dependence was −0.00027 m⁻¹/PSU. Field measurements support the temperature and salinity dependencies found in the laboratory both in the near infrared and at shorter wavelengths. To make estimates of the temperature dependence in wavelength regions for which we did not make measurements we used a series of Gaussian curves that were fit to the absorption spectrum in the visible region of the spectrum. The spectral dependence on temperature was then estimated based on multiplying the Gaussians by a fitting factor. en_US
dc.description.sponsorship This research was supported by the Environmental Optics branch of the Office of Naval Research and by the National Aeronautics and Space Administration under grant NAGW-3580. en_US
dc.language.iso en_US en_US
dc.publisher Optical Society of America en_US
dc.relation.ispartofseries Applied Optics en_US
dc.relation.ispartofseries Vol. 36 no. 24 en_US
dc.subject Absorption en_US
dc.subject water en_US
dc.subject temperature en_US
dc.subject salinity en_US
dc.title Absorption and attenuation of visible and near-infrared light in water: dependence on temperature and salinity en_US
dc.type Article en_US
dc.identifier.doi 10.1364/AO.36.006035

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