Scientists deploy a CTD and water sampler over the side.
Lowering a CTD over the side A CTD is an electronic instrument package that accurately reports conductivity, temperature and depth and transmits data up the conducting wire to a computer on board. the computer calculates salinity from conductivity and temperature. Together, salinity and temperature determine the density of seawater, which in turn affects its movements; and temperature affects biological rates and behavior. The gray cylinders around the top are Niskin bottles which are closed at depths where scientists want to obtain water samples. The closure is controlled electronically from the ship's lab. The hose which you see coming off the unit is attached to a pump on deck so that the scientists can get continuous and large volumes of water from various depths.

Paying out the hose "Paying out hose for the pumping system." Here the pumping system is overboard, and people on deck are paying out 80 meters of hose which has to be lowered behind the CTD.

Hose on deck Pumping system hose between deployments of the CTD.

From here, continue with:
  • Return to Cruise Overview
  • Cruise Preparations: Planning a research cruise.
  • Current Meter Mooring: Reporting water data via satellite.
  • Satellite-tracked Drifters: Following water (and plankton) movements.
  • MOCNESS: Multi-level underwater net sampling system for collecting plankton.
  • Plankton Research: How plankton are stored and studied on board.
  • Links to more research-related sites, as well as detailed, live data from buoys in the Gulf of Maine.

  • On Location Home Page