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CHEN Tianran,YU Kefu,ZHAO Jianxin,YAN Hongqiang,SONG Yinxian,FENG Yuexing,CHEN Tegu. 2015. Testing coral paleothermometers (B/Ca, Mg/Ca, Sr/Ca, U/Ca and δ18O) under impacts of large riverine runoff. Acta Oceanologica Sinica, 34(8):20-26
Testing coral paleothermometers (B/Ca, Mg/Ca, Sr/Ca, U/Ca and δ18O) under impacts of large riverine runoff
淡水径流影响下珊瑚温度计(B/Ca、Mg/Ca、Sr/Ca、U/Ca和δ18O)的稳定性测试
Received:April 10, 2014  Revised:October 08, 2014
DOI:10.1007/s13131-015-0705-9
Key words:Porites coral  SST proxies  coral paleothermometers  riverine runoff  Zhujiang River (Pearl River) Estuary  northern South China Sea
中文关键词:  滨珊瑚  水温代用指标  珊瑚温度计  径流  珠江口  南海北部
基金项目:The National Basic Research Program (973 program) of China under contract No. 2013CB956104; the National Natural Science Foundation of China under contract Nos 41106054, 41306109 and 41476038.
Author NameAffiliationE-mail
CHEN Tianran Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China chentianran@scsio.ac.cn 
YU Kefu Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China  
ZHAO Jianxin Radiogenic Isotope Laboratory, School of Earth Sciences, The University of Queensland, Brisbane, QLD 4072, Australia  
YAN Hongqiang Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China  
SONG Yinxian Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China  
FENG Yuexing Radiogenic Isotope Laboratory, School of Earth Sciences, The University of Queensland, Brisbane, QLD 4072, Australia  
CHEN Tegu Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China  
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Abstract:
      Sea surface temperature (SST) proxies including B/Ca, Mg/Ca, Sr/Ca, U/Ca and δ18O were analyzed in the skeleton of a Porites coral collected from the Zhujiang River (Pearl River) Estuary (ZRE). These geochemical proxies are influenced by river runoff and this area of the northern South China Sea is strongly affected by seasonal freshwater floods. We assessed the robustness of each SST proxy through comparison with the local instrumental SST. Coral Sr/Ca shows the highest correlation with SST variations (r2=0.59), suggesting Sr/Ca is the most robust SST proxy. In contrast, coral δ18O (r2=0.46), B/Ca (r2=0.43) and U/Ca (r2=0.41) ratios were only moderately correlated with SST variations, suggesting that they are disturbed by some other factors in addition to SST. The poor correlation (r2=0.27) between SST and Mg/Ca indicates that Mg/Ca in coral skeletons is not a simple function of SST variations. This may ultimately limit the use of Mg/Ca as a coral paleothermometer.
中文摘要:
      对南海北部珠江口采集的滨珊瑚骨骼地球化学温度计指标B/Ca、Mg/Ca、Sr/Ca、U/Ca和δ18O进行了分析,目的在于测试这些地化指标在径流冲淡水影响下的稳定性.测试方法是将各个地化指标与水温对比并进行相关性分析.结果表明,Sr/Ca比值与当地水温有最好的相关性(r2=0.59),说明Sr/Ca是最稳定的温度计指标.而δ18O(r2=0.46)、B/Ca(r2=0.43)和U/Ca(r2=0.41)与水温的相关系数相对较低,说明这些指标除受到水温控制以外还受到其他环境因素的影响.在这些指标中,相关性最低的是Mg/Ca(r2=0.27),说明Mg/Ca受到除水温以外的因素影响最为显著,这就限制了Mg/Ca作为有效的温度计指标应用于古气候重建的研究.
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