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首页> 外文期刊>Estuarine Coastal and Shelf Science >Spatio-temporal variability and ENSO modulation of turbid freshwater plumes along the Oregon coast
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Spatio-temporal variability and ENSO modulation of turbid freshwater plumes along the Oregon coast

机译：俄勒冈州海岸浑浊淡水羽毛的时空变异性和ENSO调制

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摘要

The influence of climate variability on the Northeast Pacific (NEP) ocean is mainly linked to the impact of El Nino Southern Oscillation (ENSO), the Pacific Decadal Oscillation (PDO), and North Pacific Gyre Oscillation (NPGO) on the modulation of coastal circulation, coastal upwelling, and ecosystem response. The impact of climate variability on the interannual variability of freshwater river plumes has been largely unstudied. Here, 14.5 years of ocean color satellite imagery were used to study the interannual variability of turbid freshwater plumes off the Oregon coast. EOF analysis reveals two dominant modes associated with (i) the winter plumes of coastal rivers merged along the entire Oregon shelf (EOF1) in the downstream (northward) direction as coastal-attached buoyancy-driven plumes, and (ii) the offshore Columbia River plume occupying most of the coastal ocean off Oregon (EOF2) as result of its southward and offshore transport during spring-summer upwelling. Large plumes corresponded mainly with certain aspects of ENSO cycles. However, extended ocean time series are needed to better evaluate the influence of PDO and NPGO because of their dominant decadal variability. Anomalously large coastal plumes (EOF1) lagged the canonical El Nino primarily during fall and La Nina during winter. The largest offshore Columbia River plume events occurred after persistent La Nina conditions (e.g. 2008, 2011, 2014).
机译：气候变异性对东北太平洋（NEP）海洋的影响主要与El Nino Southern振荡（ENSO），太平洋二等振荡（PDO）和北太平洋狂欢振荡（NPGO）对沿海循环的调节的影响有关，沿海上升和生态系统回应。气候变化对淡水河流羽羽际变化的影响大大不含糊。在这里，14.5年的海洋彩色卫星图像用于研究俄勒冈州海岸浑浊淡水羽毛的续变性。 EOF分析揭示了与（i）沿着整个俄勒冈州的沿海架子（EOF1）合并在下游（向北）方向的冬季河流的冬季羽毛，作为沿海浮力的羽毛，（ii）海上哥伦比亚河春天夏季升值期间的南方和近海运输结果，羽流占据大多数沿海海洋（eof2）。大型羽羽主要与ENSO循环的某些方面相对应。然而，由于其主导的十二次变异性，因此需要更好地评估PDO和NPGO的影响。在冬天，大量大型沿海羽毛（eof1）主要在秋季和La Nina期间落后于规范El Nino。最大的海上哥伦比亚河羽毛事件发生在持久的La Nina条件后发生（例如，2008年，2014年）。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2020年第30期|106880.1-106880.14|共14页
  • 作者

    Saldias Gonzalo S.; Strub P. Ted; Shearman R. Kipp;

  • 作者单位

    Univ Bio Bio Fac Ciencias Dept Fis Concepcion Chile|Ctr FONDAP Invest Dinam Ecosistemas Marinos Altas Valdivia Chile;

    Oregon State Univ Coll Earth Ocean & Atmospher Sci Corvallis OR 97331 USA;

    Oregon State Univ Coll Earth Ocean & Atmospher Sci Corvallis OR 97331 USA;

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