Is it possible to calculate dissolved inorganic carbon from pH, salinity, temperature, TOC, DOC and/or nutrients? I did found methods including alkalinity, so if it is possible to calculate alkalinity from previously mentioned parameters, it might also be useful.
Hi,
To answer your question, the total dissolved carbon of a sample corresponds to the quantity of carbon measured once the sample has been filtered (generally 0.45 or 0.2 microns). Total dissolved carbon is composed of dissolved organic carbon (DOC) and dissolved inorganic carbon (DIC) :
total dissolved carbon = DOC + DIC
To determine the DIC you can i) measure the total dissolved carbon and the DOC then calculate the DIC (method valid for a soil or water sample); ii) directly measure the DIC by calcimetry (method less sensitive and valid for soil).
If you want additional information, do not hesitate to ask.
The DIC function calculates the Deviance Information Criterion given the MCMC chains from an estimateMRH routine, using the formula: DIC = .5*var(D)+mean(D), where D is the chain of -2*log(L), calculated at each retained iteration of the MCMC routine. It also provides the Aikaike Information Criterion (AIC) = 2*p + D and the Bayesian Information Criterion (BIC) = p*ln(n) + D, where `p' is the number of parameters in the model. Both AIC and BIC report the maximum (i.e. "worst") values in the chain.
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