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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 9 — Apr. 25, 2011
  • pp: 7945–7959

Effects of particle aggregation and disaggregation on their inherent optical properties

Wayne H. Slade, Emmanuel Boss, and Clementina Russo  »View Author Affiliations


Optics Express, Vol. 19, Issue 9, pp. 7945-7959 (2011)
http://dx.doi.org/10.1364/OE.19.007945


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Abstract

In many environments a large portion of particulate material is contained in aggregated particles; however, there is no validated framework to describe how aggregates in the ocean scatter light. Here we present the results of two experiments aiming to expose the role that aggregation plays in determining particle light scattering properties, especially in sediment-dominated coastal waters. First, in situ measurements of particle size distribution (PSD) and beam-attenuation were made with two laser particle sizing instruments (one equipped with a pump to subject the sample to aggregate-breaking shear), and measurements from the two treatments were compared. Second, clays were aggregated in the laboratory using salt, and observed over time by multiple instruments in order to examine the effects of aggregation and settling on spectral beam-attenuation and backscattering. Results indicate: (1) mass normalized attenuation and backscattering are only weakly sensitive to size changes due to aggregation in contrast to theory based on solid particles, (2) the spectral slope of beam-attenuation is indicative of changes in PSD but is complicated by instrument acceptance angle, and (3) the spectral shape of backscattering did not provide as clear a relationship with PSD as spectral beam attenuation, as is predicted by theory for solid spheres.

© 2011 OSA

OCIS Codes
(010.4450) Atmospheric and oceanic optics : Oceanic optics
(120.5820) Instrumentation, measurement, and metrology : Scattering measurements
(290.2200) Scattering : Extinction
(290.5850) Scattering : Scattering, particles
(010.4458) Atmospheric and oceanic optics : Oceanic scattering
(010.1350) Atmospheric and oceanic optics : Backscattering

ToC Category:
Atmospheric and Oceanic Optics

History
Original Manuscript: January 28, 2011
Revised Manuscript: March 22, 2011
Manuscript Accepted: March 31, 2011
Published: April 11, 2011

Virtual Issues
Vol. 6, Iss. 5 Virtual Journal for Biomedical Optics

Citation
Wayne H. Slade, Emmanuel Boss, and Clementina Russo, "Effects of particle aggregation and disaggregation on their inherent optical properties," Opt. Express 19, 7945-7959 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-9-7945


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