Collecting Water Samples
Collecting Water Samples On a Sunny Day

A break in the overcast days brings on great sunny weather for sampling water from the CTD. Photo Credit: Mitch Elend, University of Washingotn.

A CTD rosette with a suite of attached sensors is utilized on the Regional Cabled Array OOI cruises to measure ocean properties and to collect fluid samples adjacent to the Shallow and Deep Profiler Moorings for instrument verification. The rosette includes conductivity-temperature-depth (CTD) sensors, dissolved oxygen, chlorophyll fluorescence, transmissometer, pH,  a Photosynthetically Active Radiation (PAR) sensor, and an altimeter.  If time permits during the cruise, multiple vertical casts with the CTD package will be undertaken. Shipboard and follow-on shorebased analyses of fluids will be compared to the CTD on Jason and to instruments on the moorings to examine instrument calibration and drift. CTD's are conducted prior to recovery of instruments on the mooring, and subsequent to reinstallation.