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Spatio-temporal variability and ENSO modulation of turbid freshwater plumes along the Oregon coast
Estuarine, Coastal and Shelf Science ( IF 2.8 ) Pub Date : 2020-06-26 , DOI: 10.1016/j.ecss.2020.106880
Gonzalo S. Saldías , P. Ted Strub , R. Kipp Shearman

The influence of climate variability on the Northeast Pacific (NEP) ocean is mainly linked to the impact of El Niño 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 Niño primarily during fall and La Niña during winter. The largest offshore Columbia River plume events occurred after persistent La Niña conditions (e.g. 2008, 2011, 2014).



中文翻译:

俄勒冈州海岸浑浊淡水羽流的时空变化和ENSO调制

气候多变性对东北太平洋(NEP)海洋的影响主要与厄尔尼诺南部涛动(ENSO),太平洋年代际涛动(PDO)和北太平洋回转涛动(NPGO)对沿海环流调制的影响有关,沿海上升流和生态系统响应。气候变化对淡水河羽流年际变化的影响尚未得到研究。在这里,使用了14.5年的海洋彩色卫星图像来研究俄勒冈州海岸附近浑浊的淡水羽流的年际变化。EOF分析揭示了两种主要模式,这些模式与(i)沿整个(下游)方向沿整个俄勒冈架子(EOF1)融合的沿海河流的冬季羽流为沿海附着浮力驱动的羽流,(ii)哥伦比亚河羽状流占据了俄勒冈州(EOF2)附近大部分沿海海洋,这是由于其在春夏季上升期间向南和近海的运输。大羽流主要与ENSO循环的某些方面相对应。但是,需要延长海洋时间序列,以便更好地评估PDO和NPGO的年代际变异性,从而影响它们。异常大的沿海羽状流(EOF1)主要在秋季落入规范的厄尔尼诺现象,而在冬季则滞后于拉尼娜现象。最大的离岸哥伦比亚河羽流事件发生在持续的拉尼娜条件之后(例如2008年,2011年,2014年)。需要延长的海洋时间序列,以便更好地评估PDO和NPGO的年代际变异性,从而影响它们。异常大的沿海羽状流(EOF1)主要在秋季落入规范的厄尔尼诺现象,而在冬季则滞后于拉尼娜现象。最大的离岸哥伦比亚河羽流事件发生在持续的拉尼娜条件之后(例如2008年,2011年,2014年)。需要延长的海洋时间序列来更好地评估PDO和NPGO的年代际可变性,从而影响它们。异常大的沿海羽状流(EOF1)主要在秋季落入规范的厄尔尼诺现象,而在冬季则滞后于拉尼娜现象。最大的离岸哥伦比亚河羽流事件发生在持续的拉尼娜条件之后(例如2008年,2011年,2014年)。

更新日期:2020-07-08
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