Mekong river discharge and the east asian monsoon recorded by a coral geochemical record from Con Dao Island, Vietnam

Tung Thanh Phan; Atsuko Yamazaki; Hong Wei Chiang; Chuan Chou Shen; Lam Dinh Doan; Tsuyoshi Watanabe

doi:10.2343/geochemj.2.0552

Mekong river discharge and the east asian monsoon recorded by a coral geochemical record from Con Dao Island, Vietnam

Tung Thanh Phan, Atsuko Yamazaki, Hong Wei Chiang, Chuan Chou Shen, Lam Dinh Doan, Tsuyoshi Watanabe

Dynamics, Structure and Evolution of the Earth and Planets

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

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 (d¹⁸O_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 d¹⁸O (d¹⁸O_sw), deduced from both the Sr/Ca ratio and d¹⁸O_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 d¹⁸O_sw between flood and no-flood years could be attributed to the seasonal reversal of the regional ocean current derived from the EAM.

Original language	English
Pages (from-to)	E1-E7
Journal	GEOCHEMICAL JOURNAL
Volume	53
Issue number	2
DOIs	https://doi.org/10.2343/geochemj.2.0552
Publication status	Published - Jan 1 2019

All Science Journal Classification (ASJC) codes

Geophysics
Geochemistry and Petrology

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title = "Mekong river discharge and the east asian monsoon recorded by a coral geochemical record from Con Dao Island, Vietnam",

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 (d18Oc) 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 d18O (d18Osw), deduced from both the Sr/Ca ratio and d18Oc, 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 d18Osw between flood and no-flood years could be attributed to the seasonal reversal of the regional ocean current derived from the EAM.",

author = "Phan, {Tung Thanh} and Atsuko Yamazaki and Chiang, {Hong Wei} and Shen, {Chuan Chou} and Doan, {Lam Dinh} and Tsuyoshi Watanabe",

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AU - Phan, Tung Thanh

AU - Yamazaki, Atsuko

AU - Chiang, Hong Wei

AU - Shen, Chuan Chou

AU - Doan, Lam Dinh

AU - Watanabe, Tsuyoshi

PY - 2019/1/1

Y1 - 2019/1/1

N2 - 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 (d18Oc) 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 d18O (d18Osw), deduced from both the Sr/Ca ratio and d18Oc, 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 d18Osw between flood and no-flood years could be attributed to the seasonal reversal of the regional ocean current derived from the EAM.

AB - 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 (d18Oc) 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 d18O (d18Osw), deduced from both the Sr/Ca ratio and d18Oc, 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 d18Osw between flood and no-flood years could be attributed to the seasonal reversal of the regional ocean current derived from the EAM.

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