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

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Abstract

<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 (δ<sup>18</sup>O<sub>c</sub>) data from 1980 to 2005 of a <i>Porites</i> 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 δ<sup>18</sup>O (δ<sup>18</sup>O<sub>sw</sub>), deduced from both the Sr/Ca ratio and δ<sup>18</sup>O<sub>c</sub>, 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 δ<sup>18</sup>O<sub>sw</sub> between flood and no-flood years could be attributed to the seasonal reversal of the regional ocean current derived from the EAM.</p>

Journal

  • GEOCHEMICAL JOURNAL

    GEOCHEMICAL JOURNAL 53(2), e1-e7, 2019

    GEOCHEMICAL SOCIETY OF JAPAN

Codes

  • NII Article ID (NAID)
    130007624414
  • NII NACSIS-CAT ID (NCID)
    AA00654975
  • Text Lang
    ENG
  • ISSN
    0016-7002
  • NDL Article ID
    030194731
  • NDL Call No.
    Z53-R488
  • Data Source
    NDL  J-STAGE 
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