Volume Scattering Function and Particle Size Distribution

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Presentation transcript:

Volume Scattering Function and Particle Size Distribution Wilhelmina R. Clavano 30 July 2004 Darling Marine Center

Methodology 06 July 2004, Damariscotta River estuary Coulter counter data triplicate LISST-100 measurement triplicate 30 random sets generated for each with the same statistics as the original triplicates “Weighted” bin centers for Coulter counter D

VSF from LISST-100

PSD derived from LISST

Coulter Counts

VSF from Coulter Counts

Same VSF (in polar, some D) The VSF peaks in forward directions for larger particles.

VSF

PSD

Limitations Mie theory calculations to match LISST angular resolution Particle size distribution derived from LISST dependent on optical properties of sample but less on physiology* Small variations in “input” VSF affect the PSD estimate significantly? Any spectral dependencies, polarization?

Acknowledgments Pauline for tracking the data. Ocean optics class for the measurements. Emmanuel for ideas and the Mie code. Mary Ann for introducing me to L. megalopa.