Projects per year
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.
Original language | English |
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Pages (from-to) | 19480-19492 |
Number of pages | 13 |
Journal | Optics Express |
Volume | 16 |
Issue number | 24 |
DOIs | |
Publication status | Published - 24 Nov 2008 |
Keywords
- scattering error corrections
- in situ absorption
- Monte Carlo simulations
Projects
- 1 Finished
-
Observing optically complex oceans in situ and from space
NERC (Natural Environment Research Council)
1/12/07 → 30/11/12
Project: Research