Scattering and attenuation properties of Emiliania huxleyi cells and their detached coccoliths

Kenneth J. Voss, William M. Balch, Katherine A. Kilpatrick

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60 Scopus citations

Abstract

Measurements of the spectral scattering and attenuation properties of coccolithophores (Emiliania huxleyi; clone 88E) and their associated coccoliths were made for three growth phases as well as for acidified cultures. These measurements allow a clean separation and determination of the optical effects of the various components. The beam attenuation cross sections (m2 particle-1) were found to be 8.4E-12, 2.6E-10, and 4.9E-11 for coccoliths, plated cells, and naked cells, respectively, at 440 nm. The spectral dependence of these factors followed a power law dependence, with a wavelength exponent of -1.9, 0.42, and -0.52 for the coccoliths, plated cells, and naked cells. The volume scattering functions for all appeared similar; however, the backscattering cross sections (m2 particle-1) at 456 nm were 1.4E-13, 6.7E-12, and 9.9E-13, respectively. The wavelength dependence of this parameter also followed a power law and was -1.4, -1.2, and -1.0. Overall, these results show that optical properties of a coccolithophore bloom are sensitive to the coccolith:cell ratio and can vary between and within blooms.

Original languageEnglish (US)
Pages (from-to)870-876
Number of pages7
JournalLimnology and Oceanography
Volume43
Issue number5
DOIs
StatePublished - Jul 1998

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ASJC Scopus subject areas

  • Oceanography
  • Aquatic Science

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