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首页> 外文期刊>Estuarine Coastal and Shelf Science >A comparison of the motions of surface drifters with offshore wind properties in the Gulf of Finland, the Baltic Sea
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A comparison of the motions of surface drifters with offshore wind properties in the Gulf of Finland, the Baltic Sea

机译：芬兰湾，波罗的海地表漂流的运动与海上风能的比较

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摘要

We analyse the interconnections of wind forcing and trajectories of in-situ surface drifters deployed in the Gulf of Finland in different seasons of the years 2011 and 2013. The water masses of this brackish water body are usually strongly stratified, resulting in a layered system. The drifters were designed to follow the uppermost layer of the sea with a thickness of about 2 m. The drifter speed was 2.9-6.3% of the wind speed in 2011 when the drifters were more strongly impacted by the wind, and 1.9-2.9% in 2013 after the drifters had been modified to reduce the wind impact. The trajectories of drifters varied, in many instances the drift was almost aligned with the direction towards which the wind was blowing. In some cases the motion of drifters was systematically to the left of the wind vector apparently owing to boundary effects in the gulf. While on most occasions the drift was mostly along the gulf, on several occurrences rapid across-gulf transport was observed on time scales of 6-12 days. These observations suggest that the motions in the upper layer of the Gulf of Finland (and in similar environments) are intermittently driven by two drivers: the wind impact (including the accompanying Ekman drift) under moderate and strong winds and by underlying synoptic- and basin-scale circulation patterns in weak wind conditions. (C) 2016 Elsevier Ltd. All rights reserved.
机译：我们分析了2011年和2013年不同季节部署在芬兰湾的强迫风和原位地面漂流器的轨迹之间的相互关系。这个咸淡水体的水团通常强烈分层，形成分层系统。漂流器的设计遵循海的最上层，其厚度约为2 m。在2011年，当风对风的影响更大时，风速为风速的2.9-6.3％；在对风门进行改进以减少风的影响后，2013年，风速为2013-1.9％至2.9％。漂流者的轨迹各不相同，在许多情况下，漂流几乎与风向一致。在某些情况下，显然由于海湾中的边界效应，漂流者的运动系统地位于风向的左侧。尽管在大多数情况下，漂移主要发生在海湾上，但在数起事件中，在6至12天的时间范围内观察到了快速的跨海湾运输。这些观察结果表明，芬兰湾上层（和类似环境中）的运动是由两个驱动器间歇驱动的：中等和强风下的风影响（包括伴随的埃克曼漂移）以及潜在的天气和盆地弱风条件下的大规模循环模式。 （C）2016 Elsevier Ltd.保留所有权利。

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