Abstract
The temperature and salt dependencies of absorption by liquid water and heavy water 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 or salt dependency of absorption at wavelengths . At wavelengths , exhibited peaks at , 662, and . A small negative trough in occurred at , followed by a small positive peak , a larger negative trough at , and a strong positive peak at . The salt dependency of absorption by heavy water, , exhibited a negative power-law shape with very low , at wavelengths . 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
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