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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 45, Iss. 21 — Jul. 20, 2006
  • pp: 5294–5309

Hyperspectral temperature and salt dependencies of absorption by water and heavy water in the 400–750 nm spectral range

James M. Sullivan, Michael S. Twardowski, J. Ronald V. Zaneveld, Casey M. Moore, Andrew H. Barnard, Percy L. Donaghay, and Bruce Rhoades  »View Author Affiliations

Applied Optics, Vol. 45, Issue 21, pp. 5294-5309 (2006)

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The temperature and salt dependencies of absorption by liquid water ( H 2 O ) and heavy water ( D 2 O ) were determined using a hyperspectral absorption and attenuation meter (WET Labs, AC-S). Sodium chloride (NaCl) was used as a proxy for seawater salts. There was no significant temperature ( Ψ T ) or salt ( Ψ S ) dependency of absorption at wavelengths < 550   nm . At wavelengths > 550   nm , Ψ T exhibited peaks at 604 , 662, and 740   nm . A small negative trough in Ψ S occurred at 590   nm , followed by a small positive peak 620   nm , a larger negative trough at 720   nm , and a strong positive peak at 755   nm . The salt dependency of absorption by heavy water, Ψ s H , exhibited a negative power-law shape with very low Ψ s H , at wavelengths > 550   nm . Our experiments with NaCl, clean open ocean seawater, and artificial seawater support the hypothesis that salts modify the absorption spectra of seawater by modifying the molecular matrix and vibrations of pure water.

© 2006 Optical Society of America

OCIS Codes
(010.4450) Atmospheric and oceanic optics : Oceanic optics
(010.7340) Atmospheric and oceanic optics : Water
(120.4530) Instrumentation, measurement, and metrology : Optical constants
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(280.0280) Remote sensing and sensors : Remote sensing and sensors

ToC Category:
Atmospheric and Oceanic Optics

Original Manuscript: October 10, 2005
Revised Manuscript: January 23, 2006
Manuscript Accepted: January 23, 2006

Virtual Issues
Vol. 1, Iss. 8 Virtual Journal for Biomedical Optics

James M. Sullivan, Michael S. Twardowski, J. Ronald V. Zaneveld, Casey M. Moore, Andrew H. Barnard, Percy L. Donaghay, and Bruce Rhoades, "Hyperspectral temperature and salt dependencies of absorption by water and heavy water in the 400-750 nm spectral range," Appl. Opt. 45, 5294-5309 (2006)

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