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Meridional migration of Indian Ocean Monsoon precipitation during the early Holocene: Evidence from the Andaman Sea
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  • Y P Yang,
  • R Xiang,
  • Y Huang,
  • S F Liu,
  • J G Liu,
  • S Khokiattiwong,
  • N Kornkanitnan
Y P Yang
Innovation Academy of South China Sea Ecology and Environmental
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R Xiang
Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology

Corresponding Author:[email protected]

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Y Huang
Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology
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S F Liu
Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)
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J G Liu
Innovation Academy of South China Sea Ecology and Environmental
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S Khokiattiwong
Marine and Coastal Resources Research and Development Institute
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N Kornkanitnan
Marine and Coastal Resources Research and Development Institute
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Abstract

The Holocene evolution of the Indian Ocean Monsoon (IOM), especially the spatiotemporal nature of its maximum precipitation period, remains controversial. Here we present a high-resolution Holocene IOM rainfall record from the southern Andaman Sea. The local δ18Oseawater values suggest that local maximum rainfall occurred at 10.6-8.6 ka in the southern Andaman Sea. But the sedimentation rate and grain size detailing IOM precipitation in the northern subtropical regions exhibited its highest value at 8.6-5.5 ka. After making further comparisons with other published records for this region, we propose that maximum IOM precipitation exhibited a clearly meridional migration from south to north during the Early Holocene, which was possibly caused the combined influence of the Intertropical Convergence Zone (ITCZ) movement and the El Niño Southern Oscillation (ENSO) activities.