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Dr. John Vesecky, from the Atmospheric, Oceanic, and Space Sciences Department at the University of Michigan, will be giving a seminar on Tuesday November 7, as a part of the NOAA/ University of Michigan Great Lakes and Human Health Seminar Series.

Please find details of his talk listed below.

Title: Station/formation keeping mini-buoy for use in a wireless networked buoy array

Speaker: Dr. John Vesecky, Atmospheric, Oceanic, and Space Sciences Department at the University of Michigan

Date: Tuesday, November 7

Time: 1030 AM

Location: NOAA/ GLERL
             2205 Commonwealth Blvd., Ann Arbor, MI, 48105

Persistent ocean observations with high time and space resolution as well as extent have long been a goal for ocean observation systems. We present the design and prototype test of a propelled mini-buoy that can move at speeds of about 20 cm/s for extended periods while making ocean measurements, storing the data and communicating with neighboring buoys in a wireless networked, mini-buoy array. GPS allows knowledge of geographical position and a digital compass indicates orientation and tilt. This capability can be used to keep geographical station to GPS accuracy (several meters or less) in surface currents as high as 20 cm/s for a few days and possibly more. Alternatively propulsion can be used for formation keeping in a moving array as well as changing the array configuration. Higher positional accuracy (< 1 m) relative to other buoys in the array is possible through collective processing of GPS pseudo range data from all buoys in an array. Communication of data over long distances would be via a "mother buoy" or vessel near a mini-buoy array. The buoy is about a meter long and remains largely submerged to reduce wind-forced movement. Low power consumption was a goal throughout the design. The sensor complement for this prototype is governed by general interest as well as its initial application to ocean surface truth for airborne hyperspectral sensors in collaboration with the Airborne Sensors Group at NASA Ames Research Center. Ocean color and related measurements are emphasized. The sensors included in the prototype enable measurements of the solar irradiance at the ocean surface, upwelling hyperspectrum (256 bands from 300 to 900 nm), SST and buoy internal temperature, 10-20,000 Hz hydrophone, 3-axis accelerometers and tilt sensors for wave measurements and a GPS and digital compass for navigation. A 1 GB flash memory card allows significant storage of data on board. The fiberglass buoy structure is composed of three pods connected by vertical spars with the communication and some sensor electronics in the top pod, control and sensor electronics in the middle pod and batteries and some sensor equipment in the bottom pod. The pod and spar construction is intended to reduce drag. Propulsion is by two 2 Watt DC motors that are controlled to determine the direction and speed of motion for geographic or relative station keeping. Communication for this prototype is short range using 900 MHz (802.11) wireless technology. This report emphasizes the design, testing and demonstration of this prototype as well as plans for wireless networked, mini- buoy arrays and an initial application to harmful algal blooms in Monterey Bay.

Also, just a reminder that Dr. Stuart Ludsin's seminar titled "Ecological consequences of hypoxia in coastal systems: case studies of Lake Erie, Chesapeake Bay, and the northern Gulf of Mexico" is scheduled for tomorrow (11/1) at 1030am at GLERL. Details can be found on our website.

If you have any questions or concerns, please email me at kanika.suri@noaa.gov; or call 734-741-2147.

For more information about the seminar series, please visit our website at http://www.glerl.noaa.gov/news/seminars/


Kanika Suri
Web Designer Associate

NOAA Great Lakes Environmental Research Laboratory
2205 Commonwealth Blvd.,
Ann Arbor, MI

Tel: (734) 741-2147
Fax: (734) 741-2055


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