How to Use Autonomous Underwater Vehicle Gliders to Make Your Oceanography Better Autonomous Underwater GlidersAutonomous Underwater Gliders Describe some.

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How to Use Autonomous Underwater Vehicle Gliders to Make Your Oceanography Better Autonomous Underwater GlidersAutonomous Underwater Gliders Describe some useful glider operationsDescribe some useful glider operations o Endurance o Footprint o Weather Kipp Shearman College of Oceanic & Atmospheric Sciences Oregon State University Oregon State University Thanks to: RV Elakha Captain and Crew (OSU), J. Brodersen (OSU), Laura Rubiano-Gomez (OSU), C. Jones (WRC), F. Stahr (UW), Miss Linda Captain and Crew, T. Peery (OSU), F. Chan, K. Page-Albins (PISCO), Oscar Pizarro (UdeC), Gadiel Alarcon and Nadin Ramirez (UdeC) Jack Barth Anatoli Erofeev Zen Kurokawa Kate Adams Piero Mazzini Chris Ordoñez Gonzalo Saldias Alejandra Sanchez OSU Glider Group:

What’s a glider? Autonomous underwater vehicle – a robot!Autonomous underwater vehicle – a robot! Flies by changing its buoyancyFlies by changing its buoyancy –takes on water, becomes heavy and sinks –wings turn vertical motion into forward motion –expels water, becomes light and rises –flies saw tooth pattern through the ocean Slow, but can stay out a long timeSlow, but can stay out a long time –½ knot –3-4 week endurance Collects same data you would on a research vessel at a fraction of the costCollects same data you would on a research vessel at a fraction of the cost –Research vessel: approx. $20K/day (fuel + crew) –Glider: $150K to buy + $ /day (batteries + communications + techs) –3500 days of glider operation: 3500 days x $20K/day – 4 x ($150K+3500 days x $1000/day) = $55 million saved!

CTD Optical Sensors (Chl, CDOM and Backscatter) Pitch Batteries Science Bay Displacement Pump Glider Control and more batteries Air bladder Aanderaa Optical Dissolved Oxygen sensor GPS, Iridium and Freewave Antennae in tail fin Webb Slocum Electric Glider 7 ft long 100 lbs in air

Shelf Glider Sections ~20 km day (21+ day endurance) Very high spatial resolution Surface to Bottom coverage (200 m max) Surface every 1-6 hr to get GPS fix, download data and receive new instructions (via Iridium) Keep track via web: gliderfs2.coas.oregonstate.edu/gliderweb Salinity T (°C) Chlorophyll (μg/L) Backscatter (1/m) Dissolved Oxygen (mL/L) May 05 – 10, 2006

Glider Bob Glider Jane Five Seagliders: sg130, sg157, sg158, sg205 & sg206 Bob Smith Jane Huyer The OSU Glider Fleet 3 TWR Slocum 200 m CTD, chl, bs, cdom, DO CTD, microstructure 1 TWR Slocum 1000 m CTD, chl, dye, bs, ADCP 5 UW/iRobot/Kongsberg Seagliders 1000 m CTD, chl, bs, cdom, DO, PAR

Not true! Just because it says autonomous, doesn’t mean you get to sit around and do nothing …

-All platforms have strengths and weaknesses -Glider strengths are low cost, high resolution and long endurance -Glider weaknesses are slow speeds, coarse navigation, and limited payloads Useful Glider Ops Versus Less-Useful Glider Ops $$$$ $$$ $$ $$$ $ $$$$ What we must avoid at all costs is the op where you deploy a glider and then follow it around with a research vessel …

Newport Line 80 km cross-shelf80 km cross-shelf Strong currents (50+ cm/s)Strong currents (50+ cm/s) Complex BathymetryComplex Bathymetry Historical Observations (1950s)Historical Observations (1950s) Endurance April 2006 – Nov glider-days at sea3486 glider-days at sea 187 deployments187 deployments 82,120 km82,120 km 260,190 vertical profiles260,190 vertical profiles Bob Jane Seaglider NWPO3 NH-10 Use a variety of ships to get the gliders in/out of the water Be prepared for emergency recoveries Don’t assume piloting will be trivial

(m/s) (m/s) (m) (m) N-S Wind Speed Significant Wave Height December 2007 Storm 35+ ft seas 80 mph winds

Glider Stories: Jane is in a bit of a pickle … Wow!!! You are the best glider pilots in the world!!! I bow to your precision!!! osc Oscar Schofield, Rutgers U.

We’re collaborating with local fishermen …

Enhancing Ship-based Survey Footprint

Average section Log 10 ε (W/kg) Salinity Temperature (°C) Vastly increased data and resolution at the front Better characterization of the structure on small scales

Continuous Sampling in Bad Weather Tropical Storm Hanna Sep 2008

Autono-my-ass Autonomous Underwater GlidersAutonomous Underwater Gliders Slow, rough navigation & limited sensor payload Cheap, high spatial resolution & long endurance Useful glider operationsUseful glider operations Endurance, Footprint & Weather