U pHlocal,pCO2surfloc,
pCO2surfloc = co2star / fflocal
pCO2surfloc = fco2/fugflocal
U pHlocal,pCO2surfloc,co3local,
_RL pCO2surfloc, diclocal, pHlocal
pCO2surfloc = co2s/fflocal