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lack of observations and historical documents (Tran, 2009; Xue et al., 2012). The paleoclimatic history of Mekong River discharge will contribute to prevent the disaster due to floods and climate changes, and to promote economic development in the Mekong Delta. The geochemical compositions of Porites coral skeletons are affected by the prevailing environment at the time of skeletal deposition and high-resolution geochemical analyses of the skeletons provide useful information about seasonal variations in past sea surface climates and environments (Watanabe et al., 2003). Coral skeletal Sr/Ca ratios have been used as a proxy for sea surface temperature (SST) (e.g., Mitsuguchi et al., 2008; Bolton et al., 2014). The coral stable oxygen isotopic record (d 18 O c) has also been used for the reconstruction of SST (Watanabe et al., 2003; Cahyarini et al., 2014). Using both the Sr/Ca ratio and d 18 O, we can reconstruct the oxygen isotopic composition of sea water (d 18 O sw) as an indicator of sea surface salinity (SSS) related to freshwater runoff into the coral reefs. McCulloch et al. (1994) calculated d 18 O sw and residual variation in coral d 18 O for the Great Barrier Reef of Australia. Their results were

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