Abstract
Waters from tropical tower karst in an area with no seasonal variations in temperature show marked variations in their dissolved carbonate chemistry. Saturation indices for calcite and dolomite indicate that most samples are saturated to supersaturated with these solids. Calculated log PCO2 values for the waters give a mean of −2.12 ± 0.41. Measured PCO2 values for the soil atmosphere and soil leachates give a mean log PCO2 of −1.43 ± 0.07. The wide variation of springwater PCO2 is best explained by a predominantly closed system evolution from the initial PCO2 of the soil.
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