Sequoia Scientific, Inc.

Designed by Sequoia’s engineering team, the all new LISST-Tau is a high precision transmissometer for use on underwater vehicles, profiling platforms, CTD’s and other underwater sampling systems. The LISST-Tau precisely measures optical transmission and beam attenuation at depths down to 2,000 meters. https://lnkd.in/dFfs2BEJ #LISST #Transmissometer #environmentalimpact #environmentalsustainability #environmentalengineering #engineering #research #oceanscience #environmentalmonitoring #animation #video #howthingswork

Sequoia will be exhibiting at Ocean Optics XXVI in Las Palmas de Gran Canaria, Spain, from October 6–11, 2024! This six-day conference brings together scientists, researchers and academic institutions from around the world. By attending you will learn what new products and technologies Sequoia is offering this dynamic market. https://lnkd.in/dZTxmutC #LISST #OceanOptics

Join attending Sequoia staff members at the Argo Tech Workshop! September 10th to 13th at The University of Washington The Argo Technical Community of Practice was established by a small group of Technicians in 2021 as a forum for collaboration, knowledge sharing and coordinated action to establish, review and refine best practice procedures for pre-deployment testing of floats to eliminate premature deaths and performance-debilitating failures for core and BGC Argo. Join us in an environment where individuals working directly with Argo floats can discuss technical problems e.g. checkout testing, common issues, hardware design ideas, and deployment logistics. One of the primary goals is to identify issues that occur across programs which will then be presented to manufacturers with ‘one voice’. Link: https://lnkd.in/g9A8D6c6 #LISST

Wishing America Happy Labor Day from the staff at Sequoia! On this National Holiday our office will be closed today, and re-opening September 3rd https://lnkd.in/gUKpa6Rm #LISST #LaborDay

Sequoia welcomes Sam Cryan to the position of US West Coast Sales Engineer! Sam grew up in North Carolina before moving around the country to pursue his education. He studied Geoscience at Princeton University, earning his BS in 2022, and then moved to Seattle to obtain his MS in Oceanography from the University of Washington in 2024. Since arriving in the Pacific Northwest, he’s found it impossible to leave, captivated by the region’s natural beauty and proximity to the ocean. Sam's passion for the ocean extends beyond his studies. He volunteers with the National Ocean Science Bowl and teaches Introduction to Oceanography part-time at Bellevue College. Known for always having a fun ocean fact to share, he thrives on learning about the latest marine research. His practical experience includes two research cruises, where he utilized equipment similar to what Sequoia offers. When he's not immersed in oceanography, Sam enjoys exploring the trails of the PNW, playing board games, organizing Seattle-wide puzzle events, and maintaining his NYT Crossword and Connections streak. He is thrilled to join the Sequoia team and looks forward to helping bring Sequoia's instruments to a broader audience. https://lnkd.in/gn_MbGfE #LISST

Sequoia instruments measure IOP’s. What are they and why are they so critically important? IOP stands for ‘inherent optical property’—‘inherent’ in that they depend only upon the medium, for example, seawater including the dissolved and suspended materials within it. Two fundamental IOPs are the absorption coefficient and the volume scattering function (VSF). A third IOP often considered in oceanography is the beam attenuation coefficient, which is the sum of the absorption and total scattering coefficients. IOPs are independent of the ambient light field, for example, the position of the Sun; and are usually measured with ‘active’ sensors, meaning that they use a light source and detect how that light is affected by the medium. This independence allows IOPs to be measured across various platforms ranging from conventional moorings and marine vessels to remotely operated vehicles such as autonomous profilers and gliders. IOPs provide a means to quantify characteristics of in-water constituents such as phytoplankton and sediments to better understand water quality. They also provide a critical connection between the characteristic components in the seawater and the signal seen by ocean color satellites. Sequoia currently empowers scientists worldwide with multiple instruments for measuring IOPs in support of water quality and ocean color research: · LISST-200X and LISST-Deep Submersible Particle Size Analyzers measure beam attenuation in addition to particle size distribution · LISST-Tau High-Precision Transmissometer · Hyper-bb Hyperspectral Backscatter Instrument · LISST-VSF Multi-Angle Polarized Light Scattering Instrument · Hyper-a Hyperspectral Absorption Instrument Learn more here: https://lnkd.in/gykXrFqT #LISST #Hyper

Sequoia Scientific, Inc., together with Flanders Marine Institute (VLIZ), Flanders Hydraulics, and Institute of Natural Sciences will co-organize the 8th Particles in Europe (PiE) conference Wednesday-Friday 17-19 September 2025 in Ostend, Belgium. Preliminary Program: Day 0 (Tuesday 16th September 2025): Optional field trip in the afternoon, icebreaker in the evening. Day 1 (Wednesday 17th September 2025): Full conference day, dinner on your own. Day 2 (Thursday 18th September 2025): 1/2 conference day, afternoon science excursion, tour of Bruges, conference dinner in Bruges brewery. Day 3 (Friday 19th September 2025): 1/2 conference day, lunch, departure. Save the date and follow updates here: https://lnkd.in/ePPcXHr2

In 2019 Sequoia published a short note on our website regarding the feasibility of measuring plastic particles in situ. Two main conclusions were drawn: 1) If one considers the number concentration of plastic particles (α), and the sampling volume (SV) of any instrument used for measuring plastic particles, one can only expect to detect plastic particles when 1/ α >= SV. 2) The concentrations of plastic particles in the ocean are typically two to three orders of magnitude lower than required when the SV for LISST instruments were considered. Despite this, there are now (June 2024) almost two dozen papers in Sequoia’s technical library describing how Sequoia’s instruments have been used to measure and/or study microplastics. Read more here: https://lnkd.in/gYz3zfk7

Coastal Research in Norway with LISST-VSF Researcher Håkon Johan Sandven comments about the importance and use of the LISST-VSF within the EcoSens project: “The current project referenced (with links below) is called EcoSens and is led by Dr. Arne Kristoffersen. It is of particular interest in Norway to obtain accurate remote sensing observations of coastal waters, because of the economic importance of fisheries and aquaculture along the coast, but coastal waters are especially difficult to observe from space. This is because these waters are very optically complex (in addition to atmospheric effects), meaning that accurate in situ measurements of both scattering and absorption properties of the coastal waters are badly needed. The VSF has been particularly sparingly measured”. Learn more about the EcoSens project led by Dr. Arne Kristoffersen here: https://lnkd.in/eUA-U7tn “One challenge we have found for the LISST-VSF in such turbid waters is multiple scattering errors. We have published two articles on this where we model and characterize this error. Consequently, we now primarily use the LISST-200X for in-situ VSF measurements in turbid waters, as it has a much shorter pathlength and thus less multiple scattering effects.” For more information on the multiple scattering correction of LISST-VSF data, see the following papers: https://lnkd.in/gek9tmdH https://lnkd.in/eKXHEfDa Learn more about the LISST-VSF and LISST-200X instruments here: https://lnkd.in/gcPfQfXk https://lnkd.in/gM3uxwYi University Bergen: https://www.uib.no/ Photograph by: Elinor Tessin #LISST #UnivBergen #EcoSens

Testimonial Tuesday! “…I have to compliment the service provided by Sequoia that has been outstanding, all at no additional charges. LISST-VSF is an excellent instrument, when it is carefully calibrated. With the calibration we developed, we were able to measure the VSFs of particles of very clean seawater in the North Pacific Ocean that have been filtered through 0.2 um.” Xiaodong Zhang, Ph.D., Professor University of Southern Mississippi (USA) (2019) https://lnkd.in/ddaEjSNf #LISST