Aquatic Sciences Meeting, Albuquerque 2001

CS24 Optics

Date: Tuesday, February 13, 2001, Time: 2:30:00 PM

Location: Sandia/Santa Ana

Boss, E, , Oregon State University, Corvallis, USA, boss@oce.orst.edu

Pegau, W, S, Oregon State University, Corvallis, USA,

Lee, M, , Marine Hydrophysical Institute, Sestopol, Ukraine,

Twardowski, M, , WETLabs, Philomath, USA,

Shibanov, E, , Marine Hydrophysical Institute, Sestopol, Ukraine,

Korotaev, G, , Marine Hydrophysical Institute, Sestopol, Ukraine,

Baratange, F, , Oregon State University, Corvallis, USA,

Measurements of the phase function and their implication for inferring the bulk particulate index of refraction at LEO-15.

Scattering measurements were performed near the Leo-15 Rutgers observatory in the summer of 2000 with four different instruments. Measurements were collected in a widerange of conditions, including clear and turbid waters. The turbid water cases included both high sediment and high biological loads. A prototype phasefunction meter was used and we compare its measurements to historical phase function measurements. We estimate the backscattering ratio [bb/b] from the phase function measurements and compare it to two other estimates based on backscattering coefficient measurements from a HOBILabs HS6 and a WETlabs Eco-VSF and the scattering coefficient measured using an ac-9. Based in Mie theory the backscattering ratio has been found to be a good predictor for the index of refraction. We revisit the theory given the limitations imposed by the geometry of the sensors and evaluate the rms difference in predicting the index of refraction based on the three different estimate of the backscattering ratio.

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Aquatic Sciences Meeting, Albuquerque 2001

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