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CTD rosette suspended over the water during deployment.

CTD rosette suspended over the water during deployment.
CTD rosette suspended over the water during deployment.
CTD rosette suspended over the water during deployment.
CTD rosette suspended over the water during deployment.
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335954
Linder, Christopher L.
CTD rosette suspended over the water during deployment.
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12/30/2008
graphics/PolarDisc2/cl_20070705_agave07_ctd_003.jpg
CTDs also can be loaded with sensors to measure particles and certain chemicals in seawater, which are both telltale signs of fluids that spew out of hydrothermal vents on the seafloor. The CTD is the first tool in the scientists' toolbox to look for plumes of hydrothermal fluids. Once they find a plume, scientists can then track the plumes back to the vents that generated them.
Oceanus magazine v46n2 04/2008 caption:
For oceanographers, the thermometer and smoke detector hanging down is called a CTD , which measures conductivity (salinity) and temperature at various depths. This tried-and-true instrument is scientists? first tool to look for hydrothermal plumes. The CTD is lowered all the way to the bottom and pulled up again while it is also towed by the ship, which researchers call a ?tow-yo.? CTD sensors detect slightly warmer temperatures, mineral particles, and certain chemicals?all telltale signs that the CTD has passed through a plume. ?It's hit or miss,? said University of Texas marine geochemist Hedy Edmonds, who headed CTD operations on the expedition.
Photo by Chris Linder
© Woods Hole Oceanographic Institution
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