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Enhanced Atlantic freshwater export during El Nino

机译:厄尔尼诺现象期间大西洋淡水出口量增加

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摘要

Using two reanalysis data sets, the influence of El Nino/Southern Oscillation (ENSO) on the surface freshwater balance of the Atlantic ocean is examined. We present evidence that the transport of water vapour out of the tropical Atlantic is enhanced during warm ENSO phases, while it is reduced during cold phases. These tropical changes alter the freshwater budget of the entire Atlantic drainage basin. The difference in freshwater export between La Nina and El Nino years is on the order of 0.1 Sv (1 Sv=10(6) m(3)s(-1)) for the entire Atlantic. Results from an idealized coupled ocean-atmosphere model suggest that this amplitude is of significance for the strength of the North Atlantic thermohaline ocean circulation, if the persistence of the anomaly is on the order of decades. [References: 20]
机译:使用两个重新分析数据集,研究了厄尔尼诺现象/南方涛动(ENSO)对大西洋地表淡水平衡的影响。我们提供的证据表明,在ENSO温暖阶段,水蒸气从热带大西洋的输送增加了,而在寒冷阶段则减少了。这些热带变化改变了整个大西洋流域的淡水预算。拉尼娜年和厄尔尼诺年之间的淡水出口差异在整个大西洋上约为0.1 Sv(1 Sv = 10(6)m(3)s(-1))。理想化的海洋-大气耦合模型的结果表明,如果异常的持续时间在几十年的数量级上,那么该振幅对于北大西洋热盐海洋环流的强度意义重大。 [参考:20]

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