POSTER Session 3

UNIQUE HYPERSPECTRAL SIGNATURES OF DIATOMS

Several species of ecologically significant and distinct nano and microdiatoms, native to the California Current, were grown in culture for hyperspectral bio-optical analysis. These diatoms, including one from the harmful algal bloom genera, Pseudo-nitzschia, exhibit diverse form and function and have unique frustules and intracellular structures. We conducted bio-optical measurements of these cultures including particulate hyperspectral absorption, attenuation, scattering, and backscattering using Seabird ac-s, Eco Triplet, and Sequoia Hyper-bb sensors. Derivative and stepwise discriminant analyzes were used to differentiate between the spectral signatures of these species. Inherent optical properties were assessed over diel cycles to determine relationships to physiological changes and to understand how photoacclimation may affect errors and uncertainties associated with taxa-specific spectral signatures. These errors and uncertainties associated with taxonomic differentiation from in situ optical measurements provide insights for addressing similar challenges when using PACE mission observations.

*Alexander Bailess, Oregon State University, USA, [email protected]

Nicholas Baetge, Oregon State University, USA, [email protected]

Brian Bill, NOAA Fisheries, USA, [email protected]

Andrew Barnard, Oregon State University, USA, [email protected]

Michael Behrenfeld, Oregon State University, USA, [email protected]

Jason Graff, Oregon State University, USA, [email protected]

Kelly George, Oregon State University, USA, [email protected]

Nicholas Tufillaro, Gybe, USA, [email protected]

Maria Kavanaugh, Oregon State University, USA, [email protected]

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