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Marked contrast in wind-driven upwelling on the southeastern Nova Scotia coast in July of two years differing in ENSO conditions
Oceanological and Hydrobiological Studies ( IF 0.9 ) Pub Date : 2020-03-01 , DOI: 10.1515/ohs-2020-0008
Ricardo A. Scrosati 1 , Julius A. Ellrich 1
Affiliation  

Abstract Upwelling occurs on several coasts of the world, but it has mostly been studied on eastern ocean boundaries. We investigated upwelling on a western ocean boundary for which limited information exists. Using daily in-situ data on sea surface temperature (SST), we found a marked contrast in coastal cooling between July 2014 (pronounced) and July 2015 (weak) at two locations 110 km apart on the Atlantic coast of Nova Scotia, Canada. These findings are consistent with a marked interannual difference in wind-driven upwelling. On the one hand, southwesterlies (which cause upwelling on this coast) were more frequent in July 2014 than in July 2015. On the other hand, Bakun’s upwelling index (which is based on wind data and geographic information) indicated that coastal upwelling was more common and intense in July 2014 than in July 2015, while the reverse was true for downwelling. Interestingly, a strong El Niño event occurred in July 2015, while no El Niño (or La Niña) conditions happened in July 2014. In a recent book evaluating upwelling systems around the world, the system that is the focus of the present study was not included. Therefore, our findings should stimulate future research on upwelling on the Atlantic Canadian coast, in that way helping to further develop the knowledge base for western ocean boundaries.

中文翻译:

两年来新斯科舍省东南部海岸风驱动上升流的显着对比,ENSO 条件不同

摘要 上升流发生在世界上的几个海岸,但主要是在东部海洋边界上进行研究。我们调查了信息有限的西洋边界上的上升流。使用有关海面温度 (SST) 的每日原位数据,我们发现 2014 年 7 月(发音)和 2015 年 7 月(弱)在加拿大新斯科舍省大西洋沿岸相距 110 公里的两个地点的沿海冷却明显不同。这些发现与风驱动上升流的显着年际差异一致。一方面,2014 年 7 月的西南风(导致该海岸上升流)比 2015 年 7 月更频繁。另一方面,巴昆的上升流指数(基于风数据和地理信息)表明沿海上升流更频繁。 2014年7月较2015年7月普遍而激烈,而下流则相反。有趣的是,2015 年 7 月发生了强厄尔尼诺事件,而 2014 年 7 月没有发生厄尔尼诺(或拉尼娜)现象。包括。因此,我们的发现应该会刺激未来对加拿大大西洋沿岸上升流的研究,从而有助于进一步开发西洋边界的知识库。
更新日期:2020-03-01
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