The concentration of dissolved inorganic carbon in the Red Sea was studied using the following model:TCO2 = TCO2o + ΔTCO2bio + ΔTCO2ant. The conservative part TCO2o was correlated with the potential temperature T. The term ΔTCO2bio represents the exchanges with the marine biosphere and was expressed in the form aΔX + bΔY with X = O2, NO3, PO4 and Y = TA, Ca. The term ΔTCO2ant represents the excess of TCO2 due to the penetration of human induced CO2 in the ocean, which was expressed in the form co exp(−(zzo)/H). As a result of the study, the contribution of each of the three identified signals was evaluated and the ratio C/O/N/P for the Red Sea basin was determined.