Mooring dataset from South Sandwich Trench (Deliverable D5.1)

In this deliverable, we present a year-long time series of calibrated data from two moorings deployed in the South Sandwich Trench between February 2024 and February 2025. The central mooring included nine instruments at different depths, between approximately 1450 m and 5950 m, providing a time series of temperature, salinity, and current velocities. The mooring was situated at 60°12.85' S, 25°07.36' W in a region of northward export of Weddell Sea Deep Water (WSDW), which goes on to form Antarctic Bottom Water (AABW). Also presented is a time series of temperature and current speed from a second mooring on the western side of the trench, at a location of 60°06.49' S, 25°18.54' W. While this mooring was not fully recovered, a temperature sensor and Acoustic Current Doppler Profiler (ADCP) were recovered that had been on the seafloor for the entire deployment, at a depth of approximately 3960 m. Each time series has been calibrated, either using the data from casts of nearby conductivity-temperature-depth profilers (CTDs) or by calibrating against the nearest calibrated instrument on the mooring, and quality control has been completed to remove any unreliable data points. The data underlying this deliverable are going to be the subject of a publication in preparation. They are going to be available here when the publication is accepted.