Bontempi, P. S.. University of Rhode Island, bontempi@gsosun1.gso.uri.edu
, . S.. ,

 
INTENSIVELY LEARNING OPTICAL OCEANOGRAPHY: THE INFLUENCE OF CHLOROPHYLL A ON THE BACKSCATTERING COEFFICIENT BY PARTICLES
 
A relationship may exist between chlorophyll a concentrations and the backscattering coefficient of light by particles (bbp) in Morel Case II waters. Exploration of potential relationships may give insight into links between the underwater light field and phytoplankton distributions, algal size, and variations in bbp as a function of intracellular pigment concentrations. Implications exist for the remote sensing field, as satellites detect light leaving the water column after particles such as phytoplankton absorb and scatter light. Backscattering coefficients were approximated until the recently-developed HOBILabs Hydroscat-6 enabled measurement of bb. Discrete chl a concentrations were measured by a spectrophotometer and the backscattering coefficient measured by the Hydroscat-6 in West Sound, WA. Effects of variations in phytoplankton biomass on bbp with depth were evident in spectral assessments of the backscattering to scattering coefficient (bbp/bp) ratio, and bbp was found to increase with depth as a function of particle size. Particle size distributions from Coulter counter analyses of discrete samples supported these depth-dependent relationships; slopes (gammas) became more negative with depth indicating decreasing particle size as bbp/bp increased. Analyses are underway to examine variations in chl a with bbp and bbp/bp in other areas of East and West Sound, WA.
 
Day: Thursday, Feb. 4
Time: Poster
Location: Sweeney Center
 
Code: SS53TH1660S