Schofield, O. Rutgers University/Institute of Marine and Coastal Sciences, oscar@ahab.rutgers.edu
Moline, M. Biological Sciences Department, California Polytechnic State University, moline@polymail.calpoly.edu
Steward, R. Florida Ocean Optics Laboratory/University of South Florida, bstew@monty.marine.usf.edu
Kirkpatrick, G. Mote Marine Laboratory, gkirkpat@mote.org

 
FLUORESCENCE-BASED DECONVOLUTION OF THE BULK INHERENT OPTICAL PROPERTIES DURING A GYMNODINIUM BREVE BLOOM IN THE GULF OF MEXICO
 
Inverse models have been developed to isolate the contribution of phytoplankton and other constituents from the bulk optical properties of the water however the accuracy of these approaches are impacted when Colored Dissolved Organic Matter (CDOM) dominates the bulk optical properties. We have developed a technique, which utilizes the fluorescence emission of CDOM to estimate its contribution to the bulk absorption which allows the particulate absorption to be estimated. The technique was tested for a database collected off the western coast of Florida. The diurnal study was conducted within a G. breve bloom. The bloom was not monospecific but the field populations were segregated into two distinct groups, a mixed algal assemblage of chromophytes below the thermocline and a surface population containing G. breve. Bulk absorption ac-9 data the showed little difference between the surface and the below thermocline populations. Fluorescence-based deconvolution estimates of particulate absorption derived from bulk measurements made by the ac-9 were highly correlated to the independent estimates of particulate absorption (R2 = 0.92, p<<<0.001). The deconvoluted absorption estimates overestimated the measured particulate absorption by 12%. The deconvoluted absorption exhibited differences in the dissolved and particulate absorption with depth.
 
Day: Thursday, Feb. 4
Time: 04:30 - 04:45pm
Location: Eldorado Hotel
 
Code: CS61TH0430E