Mekong River discharge and the East Asian monsoon recorded by a coral geochemical record from Con Dao Island, Vietnam

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  • Phan Tung Thanh
    Faculty of Science, Hokkaido University
  • Yamazaki Atsuko
    Faculty of Science, Hokkaido University Faculty of Science, Kyushu University KIKAI Institute for Coral Reef Sciences
  • Chiang Hong-Wei
    High-Precision Mass Spectrometry and Environment Change Laboratory, Department of Geosciences, National Taiwan University
  • Shen Chuan-Chou
    High-Precision Mass Spectrometry and Environment Change Laboratory, Department of Geosciences, National Taiwan University Research Center for Future Earth, National Taiwan University
  • Doan Lam Dinh
    Department of Sedimentary Geology, Institute of Geological Sciences, Vietnam Academy of Science and Technology
  • Watanabe Tsuyoshi
    Faculty of Science, Hokkaido University KIKAI Institute for Coral Reef Sciences

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<p>The offshore flow of the Mekong River is strongly governed by the East Asian monsoon (EAM). Monthly-resolved skeletal carbonate Sr/Ca, Ba/Ca and oxygen isotope (δ18Oc) data from 1980 to 2005 of a Porites coral from Con Dao Island, ~90 km from the Mekong River mouth, were analyzed for capturing the past flood events and the signal of East Asian winter monsoon. Ba/Ca time series is characterized with intra-annual double peaks, the first large one in March during the dry season and relative small one in August during the wet season. The low values of seawater δ18O (δ18Osw), deduced from both the Sr/Ca ratio and δ18Oc, in the wet season resulted from precipitation and/or freshwater input from the Mekong River. The difference in the seasonal characteristics of Ba/Ca and δ18Osw between flood and no-flood years could be attributed to the seasonal reversal of the regional ocean current derived from the EAM.</p>

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