Sea Technology

FEB 2018

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

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30 ST | February 2018 In 2016, the Nav2, equipped with Turner Designs' CDOM, chlorophyll and turbidity sensors, completed two surveys off Florida's Gulf Coast and recorded re- al-time fluorescence data for identifying and tracking potential HABs. The first survey was conducted offshore, whereas the second survey was nearshore with several data points collected over the period of a day. This suc- cessful integration shows faster sampling rates spanning a large area can easily be achieved using fluorometers integrated with AUVs to quickly identify areas of concern and track distribution of HABs in any aquatic habitat. Slocum Glider Darwin Ocean stratification plays an important role in biolog- ical processes, such as vertical migration of phytoplank- ton or carbon flux, and it cannot be examined using satellite imaging due to subsurface formations. Char- acterizing subsurface events requires specialized AUVs called buoyancy gliders that have the ability to sample at depth, adding another dimension to ocean exploration, relative to surface gliders. A cooperation between Rutgers I-COOL program and Teledyne Webb Research allowed for the integration of a Turner Designs fluorometer onto the Slocum Glider Dar- win, which was deployed off the East Coast of the U.S. for 45 days beginning September 7, 2012. The integrated fluorometer had a sensor package that included a chloro- phyll sensor to look for the vertical distribution of phyto- plankton in the water column. A time-series image shows a persistent subsurface chlorophyll maximum (SCM) at about 30-m depth that could not have been detected using satellite imaging. Typical methods for determining SCM include vertically profiling a rosette from research vessels and collecting grab samples for lab analysis that require a lot of time and money, but with buoyancy glid- ers we can obtain results rapidly with minimal effort. Summary Tools such as AUVs and other unmanned vehicles of- fer oceanographers a chance to explore areas that are not easily accessible and address new questions. The ability of unmanned vehicles to reach these undersampled parts of the ocean is enough to motivate researchers to install, equip or attach as many sensors as possible—physical, chemical and biological—to obtain measurements at a fraction of the cost of manned research vessels. Acknowledgements The author would like to express special thanks to Tracy Villareal (University of Texas at Austin) and Chris DeCollibus (Teledyne Marine). Further Data For PacX or Slocum Glider data, contact Lawrence Younan at ST Lawrence Younan is a senior applications scientist at Turner Designs Inc. He began working for Turner Designs in March 2006 after completing graduate coursework at Moss Landing Marine Laboratories, California. His academic research focused on the use of pigment separation techniques to determine the temporal and spatial resolution of phytoplankton in Elkhorn Slough.

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