Change of the ENSO-related δ18O–SST correlation from coral skeletons in northern South China Sea: A possible influence from the Kuroshio Current |
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| Institution: | 1. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi''an 710075, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Institute of Global Environmental Change, Xi''an Jiaotong University, Xi''an 710049, China;1. The UWA Oceans Institute and School of Earth and Environment, The University of Western Australia, Crawley 6009, WA, Australia;2. ARC Centre of Excellence in Coral Reef Studies, The University of Western Australia, Crawley 6009, WA, Australia;3. Centre Scientifique de Monaco, Principality of Monaco, Monaco;4. Massachusetts Institute of Technology/Woods Hole Oceanographic Institution Joint Program in Oceanography/Applied Ocean Physics and Department of Marine Geology and Geophysics, Woods Hole, MA 02543, USA;5. Woods Hole Oceanographic Institution, Department of Marine Geology and Geophysics, Woods Hole, MA 02543, USA |
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| Abstract: | Chemical proxies are useful analogs for reconstructing physical properties of sea water, such as sea surface temperature (SST) and sea surface salinity (SSS). Time series of these inferred properties would allow for reconstructions of past El Niño–Southern Oscillation (ENSO) events, where no instrumental records exist. In this study, a monthly oxygen isotope record from a Porites coral is used to explain how past ENSO events are recorded in the coral skeletons. The sample covers a 12 year period and was collected from Nanwan Bay, Taiwan. During El Niño events the coral skeleton is shown to produce a δ18O–SST correlation with a slope of ?0.12 ± 0.04‰ °C?1. During other times, this value is significantly different, with a slope of ?0.21 ± 0.04‰ °C?1. Coral that grew during El Niño summers have δ18O values which are enriched by ～0.2‰, relative to other times. A possible mechanism to explain this difference may be enhanced penetration of Kuroshio Current waters into the South China Sea during summer. The observed contrast in the correlation of δ18O–SST variability in this sample supports the influence of El Niño in eastern Asia. |
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