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

• 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

Abstract

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 (δ¹⁸O_c) 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 (δ¹⁸O_sw), deduced from both the Sr/Ca ratio and δ¹⁸O_c, 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 δ¹⁸O_sw between flood and no-flood years could be attributed to the seasonal reversal of the regional ocean current derived from the EAM.

Journal

• GEOCHEMICAL JOURNAL

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

  GEOCHEMICAL SOCIETY OF JAPAN

Keywords

• coral skeleton
• Ba/Ca
• oxygen isotope
• Con Dao Island
• Mekong River

Details

• CRID: 1390845713074628992
• NII Article ID: 130007624414
• NII Book ID: AA00654975
• DOI: 10.2343/geochemj.2.0552
• ISSN: 18805973
• ISSN: 00167002
• NDL BIB ID: 030194731
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I030194731
• Web Site: https://www.jstage.jst.go.jp/article/geochemj/53/2/53_2.0552/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed