POSTER Session 4

NEW HYPERSPECTRAL ABSORPTION AND BACKSCATTERING INSTRUMENTS FOR OCEAN COLOR AND BIOGEOCHEMISTRY RESEARCH

Accurately measuring in-water absorption and backscattering, along with coincident in-situ and satellite-measured radiometry, is key to (1) refining and calibrating algorithms used by hyperspectral satellite missions such as NASA PACE to produce ocean color products such as phytoplankton community composition and (2) subsequently validating these data products in-situ. Along with this, hyperspectral measurements of absorption and backscattering offer new insights into studying particulate and dissolved materials in the ocean in support of biogeochemistry research. However, current instrumentation for in-situ absorption and backscattering measurements has been limited to either single- or multispectral wavelengths or to hyperspectral wavelengths that do not entirely meet the wavelength range/resolution requirements for next generation hyperspectral satellite missions. We have recently developed and commercialized hyperspectral absorption (Hyper-a) and backscattering (Hyper-bb) sensors to meet the needs of current and future hyperspectral remote sensing missions. Our single-angle backscattering sensor utilizes a broadband LED source, linear variable filter, and sensitive photomultiplier detector. Our absorption sensor utilizes a xenon flash lamp, dual spectrometers (signal and reference), and a flow-through integrating cavity that reduces scattering errors inherent in a reflective tube design. Both sensors are designed to be user-calibrated to enable high measurement accuracy and reduce the cost and downtime associated with typical factory calibration. We will present details of these hyperspectral absorption and backscattering instruments, challenges underlying hyperspectral instrument design, and results from characterization and calibration studies and field tests.

Ole Mikkelsen, Sequoia Scientific, Inc., USA, [email protected]

Wayne Slade, Oceansense LLC, USA, [email protected]

Thomas Leeuw, Sequoia Scientific, Inc., USA, [email protected]

Kirby Simon, Sequoia Scientific, Inc., USA, [email protected]

Michael Twardowski, Sunstone Scientific, LLC, USA, [email protected]

Alberto Tonizzo, Sunstone Scientific, LLC, USA, [email protected]

Christopher Strait, Sunstone Scientific, LLC, USA, [email protected]

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