The sampling design comprised three stations: Two stations (St. T3 and St. T5) across a zonal section off Iquique (20ºS) and a coastal station (St. L6) off Coquimbo (29ºS). The study was carried out during the LowpHox cruise conducted in November-December 2015 onboard the R/V Cabo de Hornos. At each station, temperature, salinity and dissolved oxygen (DO) were recorded from 1000 m (St.T5 and St.T3) and only 356 m (St. L6) using an oceanographic rosette with a CTD SeaBird 911 (SBE 911 plus) equipped with a SeaBird SBE-43 oxygen sensor and a Sea tech Fluorometer. Discrete water samples were also obtained for chemical measurements of oxygen.