DOI: 10.1016/j.palaeo.2013.09.004
论文题名: Sr/Ca-sea surface temperature calibration in the coral Porites lutea from subtropical northern South China Sea
作者: Chen T. ; Yu K. ; Chen T.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2013
卷: 392 起始页码: 98
结束页码: 104
语种: 英语
英文关键词: High-latitude
; Northern South China Sea
; Porites
; Sea surface temperature
; Sr/Ca
英文摘要: Strontium to calcium (Sr/Ca) ratios in annual bands of Porites corals are commonly used as past sea surface temperature proxy in tropical oceans, whereas studies that refer to Sr/Ca-SST calibration in high-latitude corals are rather rare in general. Here we present a 50-year (1961-2010) near-fortnightly Sr/Ca record in two Porites lutea corals living near the northern limit of reef-building corals in the subtropical northern South China Sea, where winter temperatures are extreme for hermatypic corals. The Sr/Ca time series shows a clear annual cyclicity, with marked sharp/narrow winter peaks. Comparison with an instrumental SST record (since 1961) indicates that this Sr/Ca record is chiefly modulated by SST. Two different methods are discussed for calibrating Sr/Ca with SST. The correlation between interpolated Sr/Ca and SST is significant, but the coefficient is relatively low, mainly attributed to extreme cold winter SSTs (<~ 16 °C) which cause a significant decrease or even cessation of coral skeletal extension. Another modified method using only annual low Sr/Ca values which could clearly be matched with the same features in the instrumental SST record is more reliable. The modified regression equation does not encompass SSTs below 24 °C. The fidelity of the coral-based Sr/Ca-SST calibration was assessed and the precision of the method is estimated to be 0.31 ± 0.62 °C based on the calibration-verification exercise. The modified method is suggested in marginal coral areas with extreme intra-annual SST variation (e.g., from 13 to 30 °C). © 2013 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69547
Appears in Collections: 过去全球变化的重建
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作者单位: Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
Recommended Citation:
Chen T.,Yu K.,Chen T.. Sr/Ca-sea surface temperature calibration in the coral Porites lutea from subtropical northern South China Sea[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2013-01-01,392