Scattering error corrections for in situ absorption and attenuation measurements

D. McKee, J. Piskozub, Ian Christopher Brown

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

Monte Carlo simulations are used to establish a weighting function that describes the collection of angular scattering for the WETLabs AC-9 reflecting tube absorption meter. The equivalent weighting function for the AC-9 attenuation sensor is found to be well approximated by a binary step function with photons scattered between zero and the collection half-width angle contributing to the scattering error and photons scattered at larger angles making zero contribution. A new scattering error correction procedure is developed that accounts for scattering collection artifacts in both absorption and attenuation measurements. The new correction method does not assume zero absorption in the near infrared (NIR), does not assume a wavelength independent scattering phase function, but does require simultaneous measurements of spectrally matched particulate backscattering. The new method is based on an iterative approach that assumes that the scattering phase function can be adequately modeled from estimates of particulate backscattering ratio and Fournier-Forand phase functions. It is applied to sets of in situ data representative of clear ocean water, moderately turbid coastal water and highly turbid coastal water. Initial results suggest significantly higher levels of attenuation and absorption than those obtained using previously published scattering error correction procedures. Scattering signals from each correction procedure have similar magnitudes but significant differences in spectral distribution are observed.
LanguageEnglish
Pages19480-19492
Number of pages13
JournalOptics Express
Volume16
Issue number24
DOIs
Publication statusPublished - 24 Nov 2008

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attenuation
scattering
coastal water
alternating current
step functions
photons
particulates
artifacts
backscattering
tubes
sensors
estimates
wavelengths
simulation

Keywords

  • scattering error corrections
  • in situ absorption
  • Monte Carlo simulations

Cite this

McKee, D. ; Piskozub, J. ; Brown, Ian Christopher. / Scattering error corrections for in situ absorption and attenuation measurements. In: Optics Express. 2008 ; Vol. 16, No. 24. pp. 19480-19492.
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Scattering error corrections for in situ absorption and attenuation measurements. / McKee, D.; Piskozub, J.; Brown, Ian Christopher.

In: Optics Express, Vol. 16, No. 24, 24.11.2008, p. 19480-19492.

Research output: Contribution to journalArticle

TY - JOUR

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AU - McKee, D.

AU - Piskozub, J.

AU - Brown, Ian Christopher

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AB - Monte Carlo simulations are used to establish a weighting function that describes the collection of angular scattering for the WETLabs AC-9 reflecting tube absorption meter. The equivalent weighting function for the AC-9 attenuation sensor is found to be well approximated by a binary step function with photons scattered between zero and the collection half-width angle contributing to the scattering error and photons scattered at larger angles making zero contribution. A new scattering error correction procedure is developed that accounts for scattering collection artifacts in both absorption and attenuation measurements. The new correction method does not assume zero absorption in the near infrared (NIR), does not assume a wavelength independent scattering phase function, but does require simultaneous measurements of spectrally matched particulate backscattering. The new method is based on an iterative approach that assumes that the scattering phase function can be adequately modeled from estimates of particulate backscattering ratio and Fournier-Forand phase functions. It is applied to sets of in situ data representative of clear ocean water, moderately turbid coastal water and highly turbid coastal water. Initial results suggest significantly higher levels of attenuation and absorption than those obtained using previously published scattering error correction procedures. Scattering signals from each correction procedure have similar magnitudes but significant differences in spectral distribution are observed.

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KW - Monte Carlo simulations

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