A systematic survey of the modeled optical properties of nonspherical marine-like particles Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/z029p6976

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  • The optical properties of randomly oriented, spheroidal marine particles are modeled using both numerical and analytical techniques. The optical properties examined are attenuation, scattering, absorption and backscattering. The optical properties are compared to those of equal-volume spheres. The optical properties of very small particles, relative to the wavelength of the incident light, with a very small refractive index relative to that of the surrounding medium, such as viruses, proteins, and small bacteria show no dependence on shape. The optical properties of larger bacteria and small phytoplankton such as Synechococcus are smaller than those of an equal volume sphere. The optical properties of the remainder of the particles, which includes most phytoplankton, show considerable variation in shape effects. Very large particles are shown to converge to known limits, with spherical particles always underestimating the optical properties of equal-volume spheroids. For populations of particles hyperbolically distributed with respect to both size and shape, it is found that the attenuation coefficient is underestimated by equal volume spheres by as much as a factor of 2.
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2010-10-04T14:45:09Z (GMT) No. of bitstreams: 1HerringSeanG2002.pdf: 443962 bytes, checksum: b76e39de9abf2c1f1afa0c6394c3f316 (MD5)
  • he optical properties of randomly oriented, spheroidal marine particles are modeled using both numerical and analytical techniques. The optical properties examined are attenuation, scattering, absorption and backscattering. The optical properties are compared to those of equal-volume spheres. The optical properties of very small particles, relative to the wavelength of the incident light, with a very small refractive index relative to that of the surrounding medium, such as viruses, proteins, and small bacteria show no dependence on shape. The optical properties of larger bacteria and small phytoplankton such as Synechococcus are smaller than those of an equal volume sphere. The optical properties of the remainder of the particles, which includes most phytoplankton, show considerable variation in shape effects. Very large particles are shown to converge to known limits, with spherical particles always underestimating the optical properties of equal-volume spheroids. For populations of particles hyperbolically distributed with respect to both size and shape, it is found that the attenuation coefficient is underestimated by equal volume spheres by as much as a factor of 2.
  • description.provenance : Made available in DSpace on 2010-10-04T14:48:23Z (GMT). No. of bitstreams: 1HerringSeanG2002.pdf: 443962 bytes, checksum: b76e39de9abf2c1f1afa0c6394c3f316 (MD5)
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2010-10-04T14:48:23Z (GMT) No. of bitstreams: 1HerringSeanG2002.pdf: 443962 bytes, checksum: b76e39de9abf2c1f1afa0c6394c3f316 (MD5)
  • description.provenance : Submitted by Eric Hepler (ehscanner@gmail.com) on 2010-10-01T20:14:57ZNo. of bitstreams: 1HerringSeanG2002.pdf: 443962 bytes, checksum: b76e39de9abf2c1f1afa0c6394c3f316 (MD5)

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