Sea Technology

FEB 2013

The industry's recognized authority for design, engineering and application of equipment and services in the global ocean community

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The conventional model has a SeaBird Electronics Inc. (Bellevue, Washington) SBE41CP CTD sensor on top. It is designed to have enough capacity to load additional sensors, and there are now some models with additional sensors (i.e., dissolved oxygen sensors) under development. Observed data are transmitted to landbased stations by the Iridium Short Burst Data service. This also enables two-way communication so that the at-sea operations of the deep foat can be changed by operators via e-mail. Float locations at the sea surface are fxed by GPS. The Deep NINJA foat is powered by lithium batteries. fles. It reached the surface one day after deployment, reset its GPS position and transmitted the observed data by e-mail via satellite in 34 minutes. Then, the foat descended and continued to repeat this process to measure 3,800-meter profles for several cycles. The frst observation from 4,000 meters was accomplished during the 10th cycle in September, and then the deep observations were succeeded during the next two cycles. At the 18th and 19th cycle in October, the foat displayed its ability to stably drift near the maximum operation depth of 4,000 meters. During the test, installed Deep NINJA foat functions were also examined and verifed to operate properly. The developDeep-Sea Field Test Results ers believe that Deep NINJA can recogDeep NINJA���s deep-sea feld test was nize most observation patterns required The frst deployment of the Deep NINJA conducted east of Japan in the Pacifc by users. deep-profling foat from the WakataOcean for about six weeks from August ka-maru in August. The foat successDeep NINJA has two profle-depth pato October. In August, two prototypes fully measured temperature and salinity rameters: the deep (3,800 or 4,000 mewere deployed from the Wakataka-maru, profles from a depth of 4,000 meters. ters) and middle (2,000 meters). Normala fsheries research vessel of the Tohoku (Photo Credit: Tohoku National Fisheries ly, the foat will operate to observe one National Fisheries Research Institute in Research Institute, Japan) deep profle for every three to fve middle Japan. profles to save energy, as was demonDuring the test, one foat remained near the deployed strated in the 13th to 15th cycles. Deep NINJA can observe location while moving anti-cyclonically. After deployment, a deep profle every cycle, too, as was demonstrated during the foat descended to a preset depth of 3,800 meters and the sixth to ninth cycles of the test. Both depth parameters are ascended while measuring temperature and salinity prochangeable via e-mail after deployment, which was verifed Bring your data to the surface. Inductive Mooring Line Modem: Fast transmission Cost effective Real-time telemetry Easy system integration FEBRUARY 2013 / st 43

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