Hydrography

The hydrographic work consisted of conductivity, temperature, and depth (CTD) profiles, along with simultaneous light-transmission and dissolved-oxygen profiles. Measurements were made in real time and transmitted by cable to the ship's laboratory. The information was used to analyze the property structure of water in a particular region, in order to characterize sources of water found in the region and the long-term water circulation patterns (years to hundreds of years). CTD data were also used to calculate water density as a function of depth, and this information can be used at successive measurement stations in the geostrophic approximation to calculate short-term currents in a region