CTD casts were taken for sound velocity from different sites and from brine and water sampling stations.
The sound velocity profiles were calculated from CTD data obtained data by an SBE Mod.19Plus and ME probes, and by XBT launches data collected by a Sippican Mod. MK21 profiler.
In addition, conductivity/temperature data at the keel were measured continuously on-the-way, while the speed of sound was calculated by the UNESCO/WHOI routine procedures and logged into the Multibeam 8160 RESON console. The data was cross-checked against the Sea Bird probe, for compatibility and accuracy.
The position of the CTD and XBT stations are shown in Fig. 6 and 7, and are reported in Table 4 and 5.
The Sound Velocity profiles were used for real-time acquisition and post-processing.