Woods Hole Oceanographic Institution

» About the Antarctic Expedition

  • Week 1

  • Week 2

  • Week 3

  • Week 4

  • Week 5

  • Week 6

» Learn More: Salps!

» Learn More: Weddell Seals!

» Learn More: Penguins!

» Learn More: Drake!

» Learn More: Gould!

» Learn More: CTD

» Learn More: Plankton Nets!

» Thank you!

Enlarge image
Oceanographers using a conductivity/ temperature/depth (CTD) recorder.


If we could send a space probe into the ocean, what would it look like?  It might look a lot like a “CTD”, a device that is lowered from a ship and records detailed information about the conductivity, temperature, and depth as it rises through the water.  Using the information that the CTD send to a computer on the ship, scientists can determine how salty the water is at different depths (its “salinity”), as well as how dense it is.  With this information they can not only figure out how the water moves, but also what types of alien organisms might live in it- like salps!


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