Bivens, J. R.. University of Southern Mississippi, jbivens@sunfish.ssc.usm.edu
Weidemann, A. R.. Naval Research Laboratory, alanw@nrlssc.navy.mil
Pegau, W. S.. Oregon State University, spegau@oce.orst.edu
Barnard, A. H.. Oregon State University, abarnare@oce.orst.edu
Redalje, D. G.. University of Southern Mississippi, Donald.Redalje@usm.edu

 
OPTICAL VARIABILITY: A NEW ANGLE
 
Within the past decade, technological advances have been aimed at allowing a more quantitative examination of oceanic composition at smaller temporal and spatial scales. In part this is accomplished by increasing the sampling resolution and spectral capability of oceanic instrumentation. As part of the ONR funded Thin Layers Experiment, 1998, a slow drop package, consisting of several prototype instruments, was deployed to resolve small scale optical variability, (<10cm) that has previously been observed in the East Sound fjord. With a decent rate between 10cm/s -20 cm/s, water property variability was measured with a Sea-Bird CTD, and the WETLabs instruments; an ac-9, HiStar, and VABAM. The ac-9 measures absorption and attenuation at nine wavelengths. The HiStar remains a promising absorption and attenuation meter, capable of 3.3 nm spectral resolution throughout the visible spectrum. These data are compared to the ac-9, which has been previously validated by the filter pad technique. As an emerging technology, the VABAM, (Variable Aperture Beam Attenuation Meter), gives a measurement of the volume scattering function at selected angles ranging from 0.2 to 3.0 degrees. Preliminary results indicate distinct oscillations in all measurements coinciding with layers at the pycnocline. The resolution of small scale variability remains under examination.
 
Day: Tuesday, Feb. 2
Time: 09:45 - 10:00am
Location: Hilton of Santa Fe
 
Code: SS05TU0945H