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首页> 美国卫生研究院文献>other >Coral Luminescence Identifies the Pacific Decadal Oscillation as a Primary Driver of River Runoff Variability Impacting the Southern Great Barrier Reef
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Coral Luminescence Identifies the Pacific Decadal Oscillation as a Primary Driver of River Runoff Variability Impacting the Southern Great Barrier Reef

机译：珊瑚发光确定太平洋年代际振荡是河流径流变异影响南部大堡礁的主要动力

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The Pacific Decadal Oscillation (PDO) is a large-scale climatic phenomenon modulating ocean-atmosphere variability on decadal time scales. While precipitation and river flow variability in the Great Barrier Reef (GBR) catchments are sensitive to PDO phases, the extent to which the PDO influences coral reefs is poorly understood. Here, six Porites coral cores were used to produce a composite record of coral luminescence variability (runoff proxy) and identify drivers of terrestrial influence on the Keppel reefs, southern GBR. We found that coral skeletal luminescence effectively captured seasonal, inter-annual and decadal variability of river discharge and rainfall from the Fitzroy River catchment. Most importantly, although the influence of El Niño-Southern Oscillation (ENSO) events was evident in the luminescence records, the variability in the coral luminescence composite record was significantly explained by the PDO. Negative luminescence anomalies (reduced runoff) were associated with El Niño years during positive PDO phases while positive luminescence anomalies (increased runoff) coincided with strong/moderate La Niña years during negative PDO phases. This study provides clear evidence that not only ENSO but also the PDO have significantly affected runoff regimes at the Keppel reefs for at least a century, and suggests that upcoming hydrological disturbances and ecological responses in the southern GBR region will be mediated by the future evolution of these sources of climate variability.
机译：太平洋年代际振荡（PDO）是一种大规模的气候现象，在十年时间尺度上调节海洋-大气的变化。大堡礁（GBR）流域的降水和河流流量变化对PDO阶段很敏感，但对PDO影响珊瑚礁的程度了解甚少。在这里，使用了六个Porites珊瑚核来生成珊瑚发光变化（径流代理）的综合记录，并确定对GBR南部吉宝礁的陆地影响的驱动因素。我们发现，珊瑚骨骼发光有效地捕获了菲茨罗伊河流域的河流流量和降雨的季节，年际和年代际变化。最重要的是，尽管厄尔尼诺-南方涛动（ENSO）事件的影响在发光记录中很明显，但PDO可以明显解释珊瑚发光复合记录的变化。在正PDO阶段，负发光异常（径流减少）与厄尔尼诺年有关，而在正PDO阶段，正发光异常（径流增加）与强或中度拉尼娜年一致。这项研究提供了明确的证据，表明至少在一个世纪内，不仅ENSO而且PDO都对吉宝礁的径流状况产生了重大影响，并且表明，南部GBR地区即将到来的水文扰动和生态响应将受到未来格鲁吉亚的演变的影响。这些气候变率的来源。

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