Sequoia Scientific, Inc.

Sequoia LISST Technology used in studies linking ocean color, particle size, and biogeochemistry

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Source: Sequoia Scientific, Inc.

Sequoia scientists recently attended the fourth International Ocean Colour Science (IOCS) meeting and NASA Ocean Color Research Team (OCRT) meeting during the week of 8 April 2019 in Busan, South Korea. The IOCS meeting is organized by the International Ocean Colour Coordinating Group (IOCCG) in partnership with the Korea Institute of Ocean Science & Technology (KIOST), NASA, EUMETSAT and Airbus. The purpose of the meetings is to bring together the ocean color community to provide updates on missions and projects, share data and ideas, and foster collaboration among scientists and agencies.

Current Sequoia LISST technology is used in studies linking ocean color, particle size, and biogeochemistry. Sessions with potential application for Sequoia’s particle measurement technologies included Requirements for Phytoplankton Characterisation, High Temporal Resolution Applications, and Remote Sensing of Optically-Complex and Shallow Water.

  • Particle size distribution measurements from LISST laser diffraction instruments and particle images from the LISST-Holo2 submersible holographic particle imaging system are useful tools for characterizing particles in situ, including phytoplankton. These same instruments can be used to better understand how changes in the characteristics of suspended particles affect the in-water optical properties, and ultimately the ocean color remote sensing signal, especially in optically-complex coastal waters.
  • For high-resolution studies of in-water particle optical properties, LISST sensors provide a means to measure size distribution in moored, towed, and underway systems. For longer-term underway deployments the FlowControl valve system can be used to automate clean water blanks and produce calibration and fouling drift-independent particle measurements, for LISST instruments as well as other flow-through instruments such as the SeaBird Scientific (WET Labs) ac-s spectrophotometer. The new LISST-Horizon system is designed for deployments in shipboard underway flow-through systems and combines LISST laser diffraction technology, automated clean water blanks, and adds side scattering measurements for extending the particle size range and calculating additional in-water optical properties.

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