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Anomalous Ba/Ca signals associated with low temperature stresses in Porites corals from Daya Bay,northern South China Sea

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Journal of Environmental Sciences 2011年第9期23卷 1452-1459页

作者： Tianran Chen Kefu Yu Shu Li Tegu Chen Qi Shi Key Laboratory of Marginal Sea Geology South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 China

Barium to calcium （Ba/Ca） ratio in corals has been considered as a useful geochemical proxy for upwelling,river flood and other oceanic ***,recent studies indicated that additional environmental or biological factors can influence the incorporation of Ba into coral *** this study,Ba/Ca ratios of two Porites corals collected from Daya Bay,northern South China Sea were ***/Ca signals in the two corals were ‘anomalous’ in comparison with Ba behaviors seen in other near-shore corals influenced by upwelling or riverine *** Ba/Ca profiles displayed similar and remarkable patterns characterized by low and randomly fluctuating background signals periodically interrupted by sharp and large synchronous peaks,clearly indicating an environmental *** analysis indicated that the Ba/Ca profiles were not correlated with previously claimed environmental factors such as precipitation,coastal upwelling,anthropogenic activities or phytoplankton blooms in other *** maxima of Ba/Ca appeared to occur in the period of Sr/Ca maxima,coinciding with the winter minimum temperatures,which suggests that the anomalous high Ba/Ca signals were related to winter-time low sea surface *** speculated that the Ba/Ca peaks in corals of the Daya Bay were most likely the results of enrichment of Ba-rich particles in their skeletons when coral polyps retracted under the stresses of anomalous winter low *** this case,Ba/Ca ratio in relatively high-latitude corals can be a potential proxy for tracing the low temperature stress.

关键词： Ba/Ca barium Porites coral cold water stress northern South China Sea

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