Dissolved Carbonate-carbon Dioxide in Sea Water of the South China Sea, Area II: Sabah, Sarawak and Brunei Darussalam

Dissolved carbonate species in seawater are determined from pH and total alkalinity. The data clearly pointed out the significance of Rajang River as a source of organic matters that were subsequently decomposed and cause CO2 gas to evade from nearshore water in its vicinity into the atmosphere while most offshore surface water was the sink of atmospheric CO2. The total alkalinity profiles indicated dissolution of carbonate minerals, believed to be high magnesian calcite, below 500 m, which reinforce CO2 storing capacity of these waters