The CTD (standing for Conductivity-Temperature-Depth) is a vital tool for oceanographers. It measures the temperature and salinity of the water as it is lowered from the surface to the sea floor. By repeating this processes in many places, the team can build a picture of the water in the Chukchi Sea and where certain currents are flowing. The sensors that measure these properties are hidden in the center of the CTD rosette – around the side, 12 bottles collect water samples at different depths. The team monitoring the cast in the control booth can both see the data collected by the CTD in real time and remotely trip the bottles to collect their samples. These water samples are used for many of the biological measurements and experiments aboard. In addition, this CTD is also equipped with a fluorimeter to measure the amount of chlorophyll in the water and also the transmissivity to measure how murky the water is – an indicator of how much sediment or other planktonic activity there is. 2 Responses Claire Pickart June 20, 2014 Thanks Amanda for these photos and article on the CTD! We have heard alot about it over the last few weeks from our son, Will. He has had the time of his life. Claire Pickart Reply firstname.lastname@example.org June 24, 2014 Hi Claire, Will has been a total joy to work with and befriend. He is a great guy! Thanks for your comment on the gallery. -Amanda Reply Leave a Reply to Claire Pickart Cancel Reply Your email address will not be published. Name* Email* Website Comment Notify me of follow-up comments by email. Notify me of new posts by email.