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Modern and past processes of ocean-atmosphere-climate interactions in the low-latitude western Pacific and Indian Ocean
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Summer monsoon-induced upwelling dominated coastal SST variations in the northern South China Sea over the last two millennia
Wednesday 9th @ 1110-1130, Conference Room 1
Wing-Man Lee, Department of Earth Sciences, The University of Hong Kong, Hong Kong, China
Kit-Chi Poon, Department of Earth Sciences, The University of Hong Kong, Hong Kong, China
Deming Kong, Guangdong Province Key Laboratory for Coastal Ocean Variation and Disaster Prediction, Guangdong Ocean University, Zhanjiang, China
Roderick J. Sewell, Hong Kong Geological Survey, Geotechnical Engineering Office, Civil Engineering and Development Department, Hong Kong, China
Yongqiang Zong, Department of Earth Sciences, The University of Hong Kong, Hong Kong, China
Yancheng Zhang* , Department of Earth Sciences, The University of Hong Kong, Hong Kong, China
Zhonghui Liu, Department of Earth Sciences, The University of Hong Kong, Hong Kong, China
Presenter Email: ychzhang@hku.hk |
The South China Sea (SCS), situated to the north of the Indo-Pacific Warm Pool (IPWP), is under the strong influence of the Asian monsoon system. However, coastal sea surface temperature (SST) records from the SCS, which are of vital importance to explore ocean-atmosphere-land interactions behind the Asian monsoon system, remain scarce. Here, we use a sediment core collected at the coast of northern SCS to investigate alkenone-SST variations over the past two millennia. On multi-centennial timescale, SST changes in our record exhibit an opposite pattern to that of Northern Hemisphere temperature and solar irradiance, e.g., relatively cool SST during the Medieval Warm Period (MWP) and warm conditions during the Little Ice Age (LIA). Together with alkenone content and existing records, we suggest that the regional SST changes result from a strengthening (weakening) of wind-driven coastal upwelling, associated with variability of the Asian summer monsoon intensity during the MWP (LIA). |
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