南海北部珊瑚高分辨率硼同位素组成及其对珊瑚礁海水pH 变化的指示意义
High resolution boron isotopic compositions of a coral from the northern South China Sea and their implications for reconstruction of seawater pH
查看参考文献21篇
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文摘
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造礁珊瑚是研究热带海洋高分辨率气候环境演变的重要载体。对采自海南岛南部三亚湾的活体滨珊瑚SY10进行了约为月分辨率的碳、氧、硼同位素组成分析, 并利用珊瑚δ~(11)B 重建了海水pH。结果显示, 所测量样品的δ13C 变化范围为–3.32‰~–1.76‰, δ~(18)O 为–6.13‰~–4.78‰, δ~(11)B 为23.51‰~26.23‰, 且这些珊瑚样品的碳、氧、硼同位素组成均存在明显的季节性周期波动。其中pH 与δ~(18)O 之间存在明显的正相关关系, 高的pH 值更倾向于在低温的季节出现, 这意味着短时间尺度该处珊瑚礁海水pH 可能主要不是受海水CO_2溶解度控制, 而是与生物活动有密切的关系。利用SY10珊瑚样品硼同位素组成重建的海水pH 值变化范围为7.77~8.37, 并呈季节性周期波动, 这种大幅度的周期波动与我们对三亚珊瑚礁海水pH 进行现场观测所得到的结果以及前人的研究成果相符, 说明了利用珊瑚δ~(11)B 重建海水pH 记录是可靠的。 |
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其他语种文摘
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Coral is a good medium for the study of high resolution climate changes in tropical oceans. In this paper, we analyzed the C, O, B isotopic compositions of 49 samples from a living Porites lutea coral, SY10, from Sanya Bay, south of Hainan Island. The result shows that, the δ13C, δ~(18)O and δ~(11)B values of the SY10 coral range from –3.32‰ to –1.76‰, from –6.13‰ to –4.78‰ and from 23.51‰ to 26.23‰, respectively. They all exhibited obvious seasonal fluctuations. A significant positive correlation occurs between the reconstructed seawater pH and δ~(18)O, which is converse to the temperature effect for the solubility of CO_2 in seawater that low temperature favors the dissolution of CO_2 and hence decreases seawater pH. Our observation that higher pH values tend to appear in low temperature seasons suggests that seawater pH on coral reefs should be largely controlled by biological activities rather than changes in CO_2 solubility. Meanwhile, the reconstructed seawater pH values range from 7.77 to 8.37, with seasonal fluctuations similar to that of the δ~(11)B. Furthermore, the substantial periodic fluctuations of reconstructed pH are in consistent with the variability of observed seawater pH records on the same coral reef, and agree with the seawater pH changes in Xisha Islands mentioned by Dai et al. (2009). We therefore conclude that it is feasible to reconstruct high resolution seawater pH by using boron isotopic composition of corals. |
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来源
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地球化学
,2015,44(1):1-8 【核心库】
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关键词
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硼同位素组成
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高分辨率
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pH
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珊瑚
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三亚湾
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地址
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1.
中国科学院广州地球化学研究所, 同位素地球化学国家重点实验室, 广东, 广州, 510640
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中国科学院广州地球化学研究所, 中国科学院边缘海地质重点实验室, 广东, 广州, 510640
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0379-1726 |
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学科
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地质学 |
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基金
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国家自然科学基金
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中国科学院广州地球化学研究所135项目
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文献收藏号
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CSCD:5334595
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