Hydrographic and carbonate system variations during El Niño 2015-2016 event in a permanent upwelling system off the coast of Chile

Hydrographic and carbonate system variations were assessed during El Niño event in a permanent upwelling system of the Humbodt Current (Southeast Pacific Ocean) in 2015-2016 . Ninety nine (99) measurements corresponding to thirty three (33) nearshore surveys conducted in the year-round upwelling system off the Atacama Desert. Temperature and salinity CTD profiles were combined with discrete measurements of pH and total alkalinity, under quality control procedures. All measurements and observations were assessed at 10 m depth.