Clara Encke, Tyler Inkley, Kei Manabe, Will Robert, Merritt Shepherd, & Guilherme Silva Department of Ocean & Resources Engineering University of Hawai‘i at Mānoa Location Information **This seminar will be held both in person (Bilger Hall 150) and over Zoom** https://hawaii.zoom.us/j/95081858686 Meeting ID: 950 8185 8686 Passcode: OREseminar The ALOHA Cabled Observatory (ACO) 100 km north of Oahu at Station ALOHA (A Long-term Oligotrophic Habitat Assessment) is the deepest (4728 m) power and internet node on the planet, returning oceanographic data from the seafloor in realtime to shore. The ACO has been operational with plug-and-play capability since 6 June 2011.
PhD Defense. Of RATs and Men: Underwater passive acoustic localization investigations using relative arrival times and blind channel estimation
Brendan P. Rideout PhD Candidate Department of Ocean and Resources Engineering University of Hawai’i at Mānoa Location Information **This defense is hybrid** In person in HIG 110 Zoom meeting ID: 935 1677 2350, Passcode: ORE https://hawaii.zoom.us/j/93516772350 Please join us afterwards (~12:30 pm) in the HIG courtyard to congratulate Brendan Understanding the ecology of any organism requires an understanding of all its life stages. Underwater acoustics provides the ability to observe the submerged lives of marine mammals in ways not possible through visual means. The complexities of underwater acoustic propagation yield both challenges and opportunities to extract information from recorded data,
Aloha Cabled Observatory (ACO) celebrates its 10th year
On June 6th 2021, the Aloha Cabled Observatory (ACO) celebrated its 10th year of operation collecting continuous temperature, salinity, velocity and acoustic data 3 miles under the waves. Hear from ACO PIs – ORE Research Professor Bruce Howe and HIGP Researcher Jim Potemra – and from the scientists and engineers who maintain and use ROV Lu’ukai to service ACO to in this episode of Voice of the Sea.
MS Plan A Defense: Reliable Acoustic Path Tomography at the ALOHA Cabled Observatory: Continuing studies
Sitthichat (Boris) Sukpholtham We have investigated the feasibility of Reliable Acoustic Path (RAP) tomography using a mobile ship platform (R/V Kilo Moana) and the existing acoustic infrastructure at the ALOHA Cabled Observatory (ACO). Travel times of acoustic signals traveling along direct paths between the shipboard acoustic source and the bottom-mounted hydrophones were measured. Perturbations of the travel times relative to predicted travel times were obtained, based on the CTD cast closest in time to the experiment date. Stochastic linear inversion was employed to solve for the sound speed perturbation field using the travel time perturbation measurements. This provides a spatially-dependent
Deepest ocean observatory celebrates ten years of operation
The ALOHA Cabled Observatory (ACO), the deepest operating ocean observatory on the planet that provides power and internet communications to scientific instruments on the seafloor, recently celebrated 10 years of operations. The development and deployment of the nearly 3-mile deep observatory was led by SOEST and supported by grants from the National Science Foundation (NSF) to UH Mānoa.“Since the HMS Challenger plumbed the deeps during its 1876 circumnavigation, measurements of the deep ocean have remained sporadic and extremely sparse in time and space. Our goal at ACO has been to establish a permanent toehold in this extreme abyssal environment, enabling