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# Copyright (C) 2008 Jean-Pierre Gattuso and Heloise Lavigne and Aurelien Proye
#
# This file is part of seacarb.
#
# Seacarb is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or any later version.
#
# Seacarb is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along with seacarb; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
#
"Ks" <-
function(S=35,T=25,P=0, ks="d",warn="y"){
nK <- max(length(S), length(T), length(P), length(ks))
##-------- Creation de vecteur pour toutes les entrees (si vectorielles)
if(length(S)!=nK){S <- rep(S[1], nK)}
if(length(T)!=nK){T <- rep(T[1], nK)}
if(length(P)!=nK){P <- rep(P[1], nK)}
if(length(ks)!=nK){ks <- rep(ks[1], nK)}
#-------Constants----------------
#---- issues de equic----
tk = 273.15; # [K] (for conversion [deg C] <-> [K])
TK = T + tk; # T [C]; TK [K]
Cl = S / 1.80655; # Cl = chlorinity; S = salinity (per mille)
iom0 = 19.924*S/(1000-1.005*S);
ST = 0.14 * Cl/96.062 # (mol/kg) total sulfate (Dickson et al., 2007, Table 2)
#--------------------------------------------------------------
#------------------ Ks ----------------------------------------
# Dickson (1990)
#
# Equilibrium constant for HSO4- = H+ + SO4--
#
# K_S = [H+]free [SO4--] / [HSO4-]
# pH-scale: free scale !!!
#
# the term log(1-0.001005*S) converts from
# mol/kg H2O to mol/kg soln
tmp1 = -4276.1 / TK + 141.328 -23.093*log(TK);
tmp2 = +(-13856 / TK + 324.57 - 47.986 * log(TK))*sqrt(iom0);
tmp3 = +(35474 / TK - 771.54 + 114.723 * log(TK))*iom0;
tmp4 = -2698 / TK *(sqrt(iom0)*iom0) + 1776 / TK *iom0 *iom0;
lnKs = tmp1 + tmp2 + tmp3 + tmp4 + log(1-0.001005*S);
Ks_d = exp(lnKs);
#--------------------------------------------------------------
#------------------ Ks ----------------------------------------
# Khoo et al. 1977
#
# Equilibrium constant for HSO4- = H+ + SO4--
#
# K_S = [H+]free [SO4--] / [HSO4-]
# pH-scale: free scale !!!
#
# correct for T range : 5 - 40°C
# correct for S range : 20 - 45
I35 <- 0.7227
I <- I35*(27.570*S)/(1000-1.0016*S) #formal ionic strength
logbeta <- 647.59/TK - 6.3451 + 0.019085*TK - 0.5208*I^(0.5)
beta <- 10^(logbeta)
Ks_k <- 1/beta
#-------------------------------------------------------------------
#--------------- choice between the formulations -------------------
is_k <- (ks=='k') # everything that is not "k" is "d" by default
Ks <- Ks_d
Ks[is_k] <- Ks_k[is_k]
method <- rep(NA, nK)
method[!is_k] <- "Dickson (1990)"
method[is_k] <- "Khoo et al. (1977)"
# ------------------- Pressure effect --------------------------------
if (any(P != 0))
Ks <- Pcorrect(Kvalue=Ks, Ktype="Ks", T=T, S=S, P=P, pHscale="F", warn=warn)
##------------Warnings
is_w <- warn == "y"
if (any (is_w & is_k & (T<5 | T>40 | S<20 | S>45)))
{warning("S and/or T is outside the range of validity of the formulation chosen for Ks.")}
if (any (is_w & (T>45 | S>45 | T<0 | S<5)))
{warning("S and/or T is outside the range of validity of the formulations available for Ks in seacarb.")}
##------------Attributes
attr(Ks,"unit") = "mol/kg-soln"
attr(Ks,"pH scale") = "free scale"
attr(Ks, "method") = method
return(Ks)
}
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