Raw PIES and current data for long-term observations of acoustic travel time (tau); bottom pressure and currents along the SAMBA transect at PIES P4 (October 2019 - October 2021)

Here we present raw bottom pressure and acoustic travel time data from a Pressure-equipped Inverted Echo Sounder (PIES) located at a depth of 4500m at location P4 (34.500°S; 14.630°E) along the South Atlantic MOC Basin-scale Array (SAMBA) transect in the Cape Basin region of the South Atlantic Ocean, between 12 October 2019 and 01 October 2021. The instrument was equipped with an additional 2000 khz Aanderaa Doppler Current Sensor (DCS) deployed at a depth of 4450m. In addition, both the PIES and the DCS were equipped with internal temperature sensors. The South African component of the international South Atlantic Meridional Overturning Circulation project (SAMOC-SA) aims to characterise the time-mean and time-varying components of the SAMOC in the South Atlantic Ocean and monitor the variability of the main Southern Ocean frontal systems associated with the Antarctic Circumpolar Current (ACC), south of Africa.