Retrospective monitoring of salinity in coastal waters with mussel shells
Retrospective monitoring of salinity in coastal waters with mussel shells
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DOI：
10.1016/j.scitotenv.2019.03.405
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发表时间：
2019-06-25
影响因子：
9.8
通讯作者：
Tanaka, Kiyoshi
中科院分区：
文献类型：
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作者：
Zhao, Liqiang;Shirai, Kotaro;Tanaka, Kiyoshi
海面盐度（SSS）是理解和预测动态沿海环境中许多物理、化学和生物过程的关键参数。然而，在许多地区，仪器测量在空间上稀疏且长度不够，阻碍了我们记录不同时间尺度的 SSS 变化、原因和后果的能力。因此，需要开发一个强大的代理来及时回溯 SSS 记录。在这里，我们测试是否可以根据日本北部大槌湾贻贝（Lamarck，1819）的壳氧同位素比（δ O-18（壳））可靠且定量地重建 SSS。 δ O-18（壳）比率在空间和时间上变化，并且与海面温度（SST）和SSS测量值表现出很强的线性相关性，表明δ O-18（壳）记录的复合信号可测量地响应这两个参数的变化。通过结合 SST 和 delta O-18（壳）的同期变化，编码到贻贝壳中的 SSS 记录被去卷积，与原位 SSS 值显着相关。为了进一步验证 Delta O-18(shell) 作为定量 SSS 代理的稳健性，重建了 Delta O-18(shell) 衍生的 SSS 的高分辨率且时间对齐的时间序列，该序列与仪器记录高度同步。特别是，夏季季风和台风事件期间会同时出现两种同表面强度降低的情况。 δ O-18（壳）衍生的 SSS 时间序列也与数值模型的时间序列相当。总之，我们的研究结果表明，贻贝三角洲 O-18（壳）特征可以用作构建沿海地区 SSS 高分辨率记录的有用工具。 (C) 2019 Elsevier B.V. 保留所有权利。
Sea surface salinity (SSS) is a key parameter to understand and predict many physical, chemical and biological processes in dynamic coastal environments. Yet, in many regions, instrumental measurements are spatially sparse and insufficiently long, hindering our ability to document changes, causes, and consequences of SSS across different time scales. Therefore, there is an need to develop a robust proxy to extend SSS records back in time. Here, we test whether SSS can be reconstructed reliably and quantitatively from shell oxygen isotopic ratios (delta O-18(shell)) of the mussel Mytilus galloprovincialis (Lamarck, 1819) in Otsuchi Bay, Northern Japan. delta O-18(shell) ratios vary spatially and temporally and exhibit strong linear correlations with both sea surface temperature (SST) and SSS measurements, indicating that the composite signal recorded by delta O-18(shell) measurably responds to variations in both parameters. By combining contemporaneous variations of SST and delta O-18(shell), SSS records encoded into mussel shells are deconvolved that significantly correlate with in situ SSS values. To further validate the robustness of delta O-18(shell) as a quantitative SSS proxy, high-resolution and temporally aligned time-series of delta O-18(shell)-derived SSS are reconstructed that are highly synchronous with the instrumental records. In particular, two lowered SSS scenarios occur concomitantly with periods of the summer monsoon and typhoon events. delta O-18(shell)-derived SSS time-series are also comparable to those from numerical modeling. In conclusion, our findings demonstrate that mussel delta O-18(shell) signatures can be used as a useful tool to construct high-resolution records of SSS in the coastal regions. (C) 2019 Elsevier B.V. All rights reserved.