九月岛湾的水动力学

IF 1.6 4区 地球科学 Q4 METEOROLOGY & ATMOSPHERIC SCIENCES
Jean-Luc Shaw, D. Bourgault, D. Dumont, D. Lefaivre
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引用次数: 1

摘要

摘要2017年春季至秋季以及2018年春季,在加拿大圣劳伦斯湾西北部的九月岛湾(BSI)测量了温度、盐度和洋流的季节性和潮汐变化。部署了地表漂流者来测量地表流速,并在海湾和群岛的21个站点定期记录CTD剖面。用拖曳式声学多普勒海流剖面仪沿着海湾口的横断面重复通过12小时。在这些样带期间,定期停下来进行CTD剖面分析。该海湾被发现是一个双层系统,在深度接近10米的地方有一个比重跃层 m.支流附近有一个水平的温度和盐度锋面,将其与圣劳伦斯湾的地表水隔开;然而,在春季最新鲜的时候,这条战线就在海湾外。潮汐平均流在海面附近向海(2-10 m) 以及更深水域的向岸(10-30 m) ,表明BSI中存在河口环流。平均和最大表面漂移速度为17.4 厘米 s和86.6 厘米 s瞬时漂流者速度较粗糙(在其西部),但与风向稳定一致,平均表面洋流似乎遵循主导风向(SSE和WNW),因为漂流者经常(在22/46例中)在背风海滩上滑行。洋流由当地潮汐主导,但通常是潮汐与河口环流、风和地球自转影响的复杂相互作用造成的。洋流与海岸的常规对齐和水深测量强调了地形控制对海湾尺度流动模式的关键作用。BSI中水的整体冲洗时间估计为天。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Hydrodynamics of the Bay of Sept-Îles
ABSTRACT Seasonal and tidal variability of temperature, salinity, and currents were measured from spring to fall 2017, and during spring 2018 in the Bay of Sept-Îles (BSI), located in the northwest of the Gulf of St. Lawrence, Canada. Surface drifters were deployed to measure surface current velocities and CTD profiles were recorded regularly at 21 stations across the bay and the archipelago. Repeated passages along a transect at the mouth of the bay were conducted for 12 hours with a towed acoustic Doppler current profiler. During these transects, regular stops were made for CTD profiling. The bay was found to be a two-layer system, with a pycnocline near a depth of 10 m. There was a horizontal temperature and salinity front near the tributary rivers separating them from the surface waters of the Gulf of St. Lawrence; however, this front was outside the bay during the spring freshet. Tide-averaged currents were seaward near the surface (2–10 m) and shoreward in deeper waters (10–30 m), suggesting an estuarine circulation in the BSI. Average and maximum surface drifter speeds were 17.4 cm s and 86.6 cm s . Instantaneous drifter velocity was coarsely ( west of it) but steadily aligned with the direction of the wind, and average surface currents seemed to follow the dominant wind directions (SSE and WNW), since drifters often (in 22/46 cases) shoaled on their leeward beaches. Currents were dominated by tides locally but usually resulted from the complex interaction of tides with estuarine circulation, winds and effects of the Earth's rotation. Usual alignment of currents with coasts and bathymetry emphasized the key role of topographic steering on bay scale flow patterns. The bulk flushing time of water in the BSI was estimated to days.
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来源期刊
Atmosphere-Ocean
Atmosphere-Ocean 地学-海洋学
CiteScore
2.50
自引率
16.70%
发文量
33
审稿时长
>12 weeks
期刊介绍: Atmosphere-Ocean is the principal scientific journal of the Canadian Meteorological and Oceanographic Society (CMOS). It contains results of original research, survey articles, notes and comments on published papers in all fields of the atmospheric, oceanographic and hydrological sciences. Arctic, coastal and mid- to high-latitude regions are areas of particular interest. Applied or fundamental research contributions in English or French on the following topics are welcomed: climate and climatology; observation technology, remote sensing; forecasting, modelling, numerical methods; physics, dynamics, chemistry, biogeochemistry; boundary layers, pollution, aerosols; circulation, cloud physics, hydrology, air-sea interactions; waves, ice, energy exchange and related environmental topics.
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