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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >Decadal variability in seawater pH in the West Pacific: Evidence from coral δ~(11)B records
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Decadal variability in seawater pH in the West Pacific: Evidence from coral δ~(11)B records

机译：西太平洋海水pH值的年代际变化：来自珊瑚δ〜（11）B记录的证据

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摘要

Long-term seawater pH records are essential for evaluating the rates of ocean acidification (OA) driven by anthropogenic emissions. Widespread, natural decadal variability in seawater pH superimposes on the long-term anthropogenic variations, likely influencing the OA rates estimated from the pH records. Here, we report a record of annual seawater pH estimated using the δ~(11)B proxy over the past 159 years reconstructed from a Porites coral collected to the east of Hainan Island in the northern South China Sea (SCS). By coupling this time series with previously reported long-term seawater pH records in the West Pacific, the decadal variability in seawater pH records and its possible driving mechanisms were investigated. The results indicate that large decadal variability in seawater pH has occurred off eastern Hainan Island over the past 159 years, in agreement with previous records. The Qiongdong upwelling system, which controls nutrient supplies, regulates surface water productivity, and is driven by the East Asian summer monsoon, is the primary control of this decadal variability, while terrestrial inputs appear not influence significantly. Meanwhile the impacts of the Pacific Decadal Oscillation (PDO) and the El Nino and Southern Oscillation (ENSO) systems on seawater pH off eastern Hainan Island is likely limited. In contrast, the PDO is the main factor to influence the decadal seawater pH variability offshore the East Australia, while the mechanism controlling the decadal seawater pH variability in Guam is not clear yet. Meanwhile, The rate of decrease in seawater pH estimated from coral records are significantly different in different regions and over different time spans, which may reflect a combination of natural decadal variability in seawater pH and long-term variations. Therefore, understanding the mechanisms driving natural variability in seawater pH is important for improving estimates of ocean acidification rates driven by anthropogenic emissions.
机译：长期海水pH记录对于评估人为排放驱动的海洋酸化（OA）速率至关重要。海水pH值的广泛自然年代际变化叠加在长期的人为变化上，可能会影响从pH记录估算的OA速率。在这里，我们报告了在过去159年中使用δ〜（11）B代理估计的年度海水pH记录，该记录是从南海北部（SCS）海南岛东部采集的Porites珊瑚重建而成的。通过将该时间序列与先前报道的西太平洋长期海水pH记录相结合，研究了海水pH记录的年代际变化及其可能的驱动机制。结果表明，在过去的159年中，海南岛东部发生了海水pH值的较大年代际变化，这与以前的记录一致。由东亚夏季风驱动的控制营养供应，调节地表水生产率并由东亚夏季风驱动的琼东上升流系统是这种年代际变化的主要控制手段，而地面输入似乎没有显着影响。同时，太平洋年代际振荡（PDO）和厄尔尼诺和南方涛动（ENSO）系统对海南岛东部海水pH的影响可能是有限的。相比之下，PDO是影响东澳大利亚近海年代际海水pH变异性的主要因素，而关岛的年代际海水pH变异性的控制机制尚不清楚。同时，根据珊瑚记录估计的海水pH下降速率在不同地区和不同时间段内差异显着，这可能反映了海水pH的自然年代际变化和长期变化的结合。因此，了解导致海水pH值自然变化的机理对于提高由人为排放驱动的海洋酸化速率的估算很重要。

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