Dataset for the manuscript "Inventory of water masses and carbonate system from Brazilian’s northeast coast: Monitoring ocean acidification".

ID Number = is the identification number of the sample, it is related to the sampling samples. Group = is the number of samples (n) per water mass. psu = is the practical salinity unit; S% = is the absolute salinity; (A) = analyzed values and (C) = calculated values. Latitude and Longitude are the geographical positions (Geographic Coordinates in decimal degrees, Datum SIRGAS 2000). (XLSX)