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PUBLIC function: calculates the ion product of H2O
K_W(S, t, p=0, SumH2SO4=NULL, SumHF=NULL, khf="dickson", khso4="dickson")
the ion product of H2O in (mol/kg-solution)2 on the free proton pH scale
salinity in practical salinity units (i.e. no unit)
temperature in degrees centigrade
gauge pressure (total pressure minus atmospheric pressure) in bars
total sulfate concentration in mol/kg-solution (calculated from S if not supplied)
total fluoride concentration in mol/kg-solution (calculated from S if not supplied)
S, t relation for K\_HF needed for scale conversion: either "dickson" (default, Dickson1979a) or "perez" (Perez1987a)
S, t relation for K\_HSO4 needed for scale conversion: either "dickson" (default, Dickson1990) or "khoo" (Khoo1977)
Andreas F. Hofmann. Maintained by Karline Soetaert (Karline.Soetaert@nioz.nl).
Millero1995 (SWS pH version), DOE1994 (cites Millero1995), Zeebe2001
K_W(35, 15) K_W(35, 15, 10) K_W(S=35, t=15, p=10, SumH2SO4=0.03) plot(K_W(35, 1:25), xlab="temperature / degC")
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