Global relationships of total alkalinity with salinity and temperature in surface waters of the world’s oceans

A simple function of sea surface salinity (SSS) and temperature (SST) in the form AT=a+b(SSS − 35) +c(SSS − 35)2+d(SST − 20) +e(SST − 20)2fits surface total alkalinity (AT) data for each of five oceanographic regimes within an area‐weighted uncertainty of ±8.1μmol kg−1(1σ). Globally coherent surface ATdata (n = 5,692) used to derive regional correlations of ATwith SSS and SST were collected during the global carbon survey in the 1990s. Such region‐specific ATalgorithms presented herein enable the estimation of the global distribution of surface ATwhen observations of SSS and SST are available.