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Exploration of Hydrothermal Vents on the Gakkel Ridge, Arctic Ocean, using AUVs Susan E. Humphris, Rob Reves-Sohn, Hanu Singh, Tim Shank Woods Hole Oceanographic Institution Hedy Edmonds U. Texas, Port Aransas The Gakkel Ridge: the slowest- spreading mid-ocean ridge on Earth (3-7 mm/yr) International Bathymetric Chart of the Arctic Ocean (IBCAO) Biogeographic Provinces on the Mid-Ocean Ridge System Biogeographic Provinces on the Mid-Ocean Ridge System Biogeographic Provinces on the Mid-Ocean Ridge System Biogeographic Provinces on the Mid-Ocean Ridge System International Bathymetric Chart of the Arctic Ocean (IBCAO) Science Goals (Funded by NASA Astrobiology and NSF Office of Polar Programs) • Biological and geological characterization of hydrothermal processes on the ultra-slow spreading and hydrographically isolated Gakkel Ridge. • Technology development for polar oceanography and future astrobiology missions to Europa. Project Status • Designed and fabricated: – 2 new AUVs for Arctic applications – wireline camera and sampling system • Under-ice engineering trials aboard Swedish ice- breaker Oden in May 2007. • Major expedition to Gakkel Ridge in 2007. Vehicle Specifications for Jaguar and Puma Vehicle Characteristics Specification Maximum Depth 5000m with 1.25 safety factor Vehicle power 6kWHr Li Ion Rechargeable Batteries Endurance Minimum of 24 hours at cruising speed of 1.0 knots with all onboard sensor, communications, and navigation equipment on line. Data Storage 2 x120 Gigabytes hard drives Additional Payload Space Plenty of additional space, buoyancy, computational power, disk space exists for the integration of other sensors Maximum Operating Current 2 knots from any direction relative to the intended track Navigation Equipment Sensors An RDI 1200 kHz DVL with bottom lock and water column measurement capabilities. IXSea Octans FOG system for heading LBL navigation with the WHOI micromodem Vehicle Specifications for Jaguar and Puma Vehicle Characteristics Specification Navigation Pressure Transducer 6000m rated Paroscientific Depth Sensor Acoustic Navigation and Tracklink ultra short baseline (USBL) and a WHOI Communications micromodem with LBL navigation and real-time telemetry Surface Communication RF radio modem with minimum range of 2 km CTD/Chemical/ Other A Seabird model CTD Fastcat Sensors Fluormeters, METS sensor 3 axis magnetometer (courtesy Yoshifumi Nogi) Eh sensor (courtesy Ko-ichi Nakamura) Mass Spectrometer (Courtesy Richard Camilli) Acoustic management Acoustic non-interference achieved by complete isolation of electrical and physical mounting systems. Camera 4 Megapixel, 12 bit dynamic range Gigabit Ethernet camera with associated strobe Multibeam Imagenex 230 kHz Delta-T multibeam system CAMPER -- Camera - Sampling System July - August 2007 A Dive and Discover cruise http:/www/divediscover.whoi.edu The Slowest Spreading Ridge on Earth
"The Seismicity and Fluid Flow of TAG Experiment"