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首页> 外文期刊>Ocean Dynamics >Along-shelf hydrographic anomalies in the Nordic Seas (1960-2011): locally generated or advective signals?
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Along-shelf hydrographic anomalies in the Nordic Seas (1960-2011): locally generated or advective signals?

机译：北欧海沿陆架水文异常（1960-2011年）：是局部产生的还是对流的信号？

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摘要

The northward flow of warm and saline Atlantic Water through the eastern Nordic Seas sustains a spring-bloom ecosystem that hosts some of the world's largest commercial fish stocks. Abrupt climatic changes, or changes beyond species-specific thresholds, may have severe effects on species abundance and distribution. Here, we utilize a numerical ocean model hindcast to explore the similarities and differences between large-scale anomalies, such as great salinity anomalies, and along-shelf hydrographic anomalies of regional origin, which represent abrupt changes at subannual time scales. The large-scale anomalies enter the Nordic Seas to the south and propagate northward at a speed one order of magnitude less than the Atlantic Water current speed. On the contrary, wind-generated along-shelf anomalies appear simultaneously along the Norwegian continental shelf and propagate northward at speeds associated with topographically trapped Kelvin waves. This process involves changes in the vertical extent of the Atlantic Water along the continental slope. Such a dynamic oceanic response both affects thermal habitats and has the potential to ventilate shelf waters by modifying the cross-shelf transport of nutrients and key prey items for early stages of fish.
机译：北欧北部东部温暖和咸的大西洋水向北流动，形成了一个春季开花的生态系统，该生态系统拥有世界上一些最大的商业鱼类种群。突然的气候变化或超出物种特定阈值的变化可能会对物种的丰度和分布产生严重影响。在这里，我们利用数值海洋模型后预报来探索大规模异常（例如大盐度异常和区域起源的沿陆架水文异常）之间的异同，这些异常代表了次年尺度上的突变。大规模异常进入北欧海的南部，并以比大西洋水流速度低一个数量级的速度向北传播。相反，在挪威大陆架上同时出现了风生沿架异常，并以与地形围困的开尔文波有关的速度向北传播。这个过程涉及大西洋水沿大陆坡的垂直范围的变化。这种动态的海洋反应既影响热生境，又有可能通过改变营养成分和主要猎物在鱼类早期的跨架运输而使架子水通风。

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