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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 15 — Jul. 20, 2009
  • pp: 12685–12691

Scattering by pure seawater at high salinity

Xiaodong Zhang and Lianbo Hu  »View Author Affiliations

Optics Express, Vol. 17, Issue 15, pp. 12685-12691 (2009)

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A new model for seawater scattering was developed, in which Gibbs function was used exclusively to derive the thermodynamic parameters that are associated with density fluctuation. Because Gibbs function was determined empirically from highly accurate measurements of a group of thermodynamic variables and is valid for SA up to 120 g kg−1 (Deep-Sea Research I, 55, 1639, 2008), we expect the model is also valid over the extended range of salinity. The model agrees with the measurements by Morel (Cahiers Oceanographiques, 20, 157, 1968) with an average difference of −0.6% for S = 0 and 2.7% for S = 38.4. The scattering by seawater as predicted increases with salinity in a non-linear fashion, and linear extrapolation of scattering based on Morel’s measurements would overestimate by up to 30%. The extrapolation of ZHH09 model (Optics Express, 17, 5698, 2009), which is valid for SA up to 40 g kg−1, however, agrees with the prediction within ± 2.5% over the entire range of salinity. Even though there are no measurements available for validation, the results suggested that the uncertainty is limited in using the newly developed model in estimating the scattering by seawater of high salinity.

© 2009 OSA

OCIS Codes
(010.0010) Atmospheric and oceanic optics : Atmospheric and oceanic optics
(010.4450) Atmospheric and oceanic optics : Oceanic optics
(290.5840) Scattering : Scattering, molecules

ToC Category:
Atmospheric and Oceanic Optics

Original Manuscript: June 2, 2009
Revised Manuscript: June 22, 2009
Manuscript Accepted: July 1, 2009
Published: July 20, 2009

Xiaodong Zhang and Lianbo Hu, "Scattering by pure seawater at high salinity," Opt. Express 17, 12685-12691 (2009)

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