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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)

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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

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

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)

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  1. D. Eisma, “Flocculation and de-flocculation of suspended matter in estuaries,” Neth. J. Sea Res. 20(2-3), 183–199 (1986). [CrossRef]
  2. I. McCave, “Particle size spectra, behavior, and origin of nepheloid layers over the Nova Scotian continental rise,” J. Geophys. Res. 88(C12), 7647–7666 (1983). [CrossRef]
  3. P. S. Hill and A. R. M. Nowell, “Comparison of two models of aggregation in continental-shelf bottom boundary layers,” J. Geophys. Res. 100(C11), 22,749–22,763 (1995). [CrossRef]
  4. A. B. Burd and G. A. Jackson, “Particle aggregation,” Ann. Rev. Mar. Scie. 1(1), 65–90 (2009). [CrossRef]
  5. I. G. Droppo, “Rethinking what constitutes suspended sediment,” Hydrol. Process. 15(9), 1551–1564 (2001). [CrossRef]
  6. W. R. Clavano, E. Boss, and L. Karp-Boss, “Inherent optical properties of non-spherical marine-like particles—from theory to observations,” Oceanogr. Mar. Biol. 45, 1–38 (2007). [CrossRef]
  7. C. Sorensen, “Light scattering by fractal aggregates: a review,” Aerosol Sci. Technol. 35, 648–687 (2001).
  8. Y. Xu and B. Gustafson, “Light scattering by an ensemble of small particles,” Recent Res. Dev. Opt. 3, 599–648 (2003).
  9. P. Latimer and F. Wamble, “Light scattering by aggregates of large colloidal particles,” Appl. Opt. 21(13), 2447–2455 (1982). [CrossRef] [PubMed]
  10. P. Latimer, “Experimental tests of a theoretical method for predicting light scattering by aggregates,” Appl. Opt. 24(19), 3231–3239 (1985). [CrossRef] [PubMed]
  11. K. L. Carder, and D. K. Costello, “Optical effects of large particles,” in Ocean Optics, R. Spinrad, K. Carder, and M. J. Perry, eds. (Oxford University Press, 1994).
  12. D. K. Costello, K. L. Carder, and W. Hou, “Aggregation of diatom bloom in a mesocosm: Bulk and individual particle optical measurements,” Deep Sea Res. Part II Top. Stud. Oceanogr. 42(1), 29–45 (1995). [CrossRef]
  13. W. Hou, K. L. Carder, and D. K. Costello, “Scattering phase function of very large particles in the ocean,” Proc. SPIE 2963 (Ocean Optics XIII), 579–584 (1997).
  14. A. Hatcher, P. Hill, and J. Grant, “Optical backscatter of marine flocs,” J. Sea Res. 46(1), 1–12 (2001). [CrossRef]
  15. E. N. Flory, P. S. Hill, T. G. Milligan, and J. Grant, “The relationship between floc area and backscatter during a spring phytoplankton bloom,” Deep Sea Res. Part I Oceanogr. Res. Pap. 51(2), 213–223 (2004). [CrossRef]
  16. E. Boss, W. H. Slade, and P. Hill, “Effect of particulate aggregation in aquatic environments on the beam attenuation and its utility as a proxy for particulate mass,” Opt. Express 17(11), 9408–9420, 420 (2009). [CrossRef] [PubMed]
  17. P. S. Hill, E. Boss, J. P. Newgard, B. A. Law, and T. G. Milligan, “Observations of the sensitivity of beam attenuation to particle size in a coastal bottom boundary layer,” J. Geophys. Res. 116(C2), C02023 (2011), doi:. [CrossRef]
  18. E. Boss, W. S. Pegau, W. D. Gardner, J. R. V. Zaneveld, A. H. Barnard, M. S. Twardowski, G. C. Chang, and T. D. Dickey, “Spectral particulate attenuation and particle size distribution in the bottom boundary layer of a continental shelf,” J. Geophys. Res. 106(C5), 9509–9516 (2001). [CrossRef]
  19. S. Ackleson, “Optical determinations of suspended sediment dynamics in western Long Island Sound and the Connecticut River plume,” J. Geophys. Res. 111(C7), C07009 (2006), doi:. [CrossRef]
  20. Y. C. Agrawal and H. C. Pottsmith, “Instruments for particle size and settling velocity observations in sediment transport,” Mar. Geol. 168(1-4), 89–114 (2000). [CrossRef]
  21. M. S. Twardowski, J. M. Sullivan, P. L. Donaghay, and J. R. V. Zaneveld, “Microscale quantification of the absorption by dissolved and particulate material in coastal waters with an ac-9,” J. Atmos. Ocean. Technol. 16(6), 691–707 (1999). [CrossRef]
  22. WET Labs, Inc., “ECO Triplet User’s Guide (triplet),” Revision P, 19 Jan. 2010. http://www.wetlabs.com/products/pub/eco/tripletp.pdf
  23. W. H. Slade and E. S. Boss, “Calibrated near-forward volume scattering function obtained from the LISST particle sizer,” Opt. Express 14(8), 3602–3615 (2006). [CrossRef] [PubMed]
  24. Y. C. Agrawal, A. Whitmire, O. A. Mikkelsen, and H. C. Pottsmith, “Light scattering by random shaped particles and consequences on measuring suspended sediments by laser diffraction,” J. Geophys. Res. 113(C4), C04023 (2008), doi:. [CrossRef]
  25. Y. C. Agrawal and O. A. Mikkelsen, “Empirical forward scattering phase functions from 0.08 to 16 deg. for randomly shaped terrigenous 1-21 microm sediment grains,” Opt. Express 17(11), 8805–8814 (2009). [CrossRef] [PubMed]
  26. E. Boss, M. S. Twardowski, and S. Herring, “Shape of the particulate beam attenuation spectrum and its inversion to obtain the shape of the particulate size distribution,” Appl. Opt. 40(27), 4885–4893 (2001). [CrossRef]
  27. M. S. Twardowski, H. Claustre, S. A. Freeman, D. Stramski, and Y. Huot, “Optical backscattering properties of the 'clearest' natural waters,” Biogeoscie. 4(6), 1041–1058 (2007). [CrossRef]
  28. G. Dall'Olmo, T. K. Westberry, M. J. Behrenfeld, E. Boss, and W. H. Slade, “Significant contribution of large particles to optical backscattering in the open ocean,” Biogeosci. 6(6), 947–967 (2009). [CrossRef]
  29. E. Boss, W. S. Pegau, M. Lee, M. S. Twardowski, E. Shybanov, G. Korotaev, and F. Baratange, “Particulate backscattering ratio at LEO 15 and its use to study particles composition and distribution,” J. Geophys. Res. 109(C1), C01014 (2004), doi:. [CrossRef]
  30. C. R. Russo, E. S. Boss, W. H. Slade, and J. Newgard, “An investigation of the acoustic backscatter response to suspensions of clay aggregates and natural sediments,” Cont. Shelf Res. (submitted).
  31. K. J. Voss and R. W. Austin, “Beam-attenuation measurements error due to small-angle scattering acceptance,” J. Atmos. Ocean. Technol. 10(1), 113–121 (1993). [CrossRef]
  32. E. Boss, W. H. Slade, M. Behrenfeld, and G. Dall’Olmo, “Acceptance angle effects on the beam attenuation in the ocean,” Opt. Express 17(3), 1535–1550 (2009). [CrossRef] [PubMed]
  33. K. Kranck, “Experiments on the significance of flocculation in the settling of fine-grained sediment in still water,” Can. J. Earth Sci. 17, 1517–1526 (1980). [CrossRef]
  34. K. Kranck, and T. G. Milligan, “Grain size in oceanography,” in Theory, Methods and Applications of Particle Size Analysis, J. P. M. Syvitski, ed. (Cambridge University Press, 1991).
  35. K. J. Curran, P. S. Hill, and T. G. Milligan, “The role of particle aggregation in size-dependent deposition of drill mud,” Cont. Shelf Res. 22(3), 405–416 (2002). [CrossRef]
  36. O. A. Mikkelsen, P. S. Hill, and T. G. Milligan, “Single-grain, microfloc and macrofloc volume variations observed with a LISST-100 and a digital floc camera,” J. Sea Res. 55(2), 87–102 (2006). [CrossRef]
  37. D. W. Townsend, M. D. Keller, M. E. Sieracki, and S. G. Ackleson, “Spring phytoplankton blooms in the absence of vertical water column stability,” Nature 360(6399), 59–62 (1992). [CrossRef]
  38. N. Briggs, “Analysis of optical spikes reveals dynamics of aggregates in the twilight zone,” University of Maine M.S. Thesis (2010). http://www.library.umaine.edu/theses/pdf/BriggsN2010.pdf
  39. K. S. Shifrin, Physical Optics of Ocean Water (American Institute of Physics, 1995).
  40. A. Khelifa and P. S. Hill, “Models for effective density and settling velocity of flocs,” J. Hydraul. Res. 44(3), 390–401 (2006). [CrossRef]
  41. F. Maggi, “Variable fractal dimension: A major control for floc structure and flocculation kinematics of suspended cohesive sediment,” J. Geophys. Res. 112(C7), C07012 (2007), doi:. [CrossRef]

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