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首页> 外文期刊>Journal of Physical Oceanography >Response of the Lower St. Lawrence Estuary to External Forcing in Winter
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Response of the Lower St. Lawrence Estuary to External Forcing in Winter

机译：冬季圣劳伦斯河下游河口对外部强迫的响应

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摘要

Mostly because of a lack of observations, fundamental aspects of the St. Lawrence Estuary's wintertime response to forcing remain poorly understood. The results of a field campaign over the winter of 2002/03 in the estuary are presented. The response of the system to tidal forcing is assessed through the use of harmonic analyses of temperature, salinity, sea level, and current observations. The analyses confirm previous evidence for the presence of semidiurnal internal tides, albeit at greater depths than previously observed for ice-free months. The low-frequency tidal streams were found to be mostly baroclinic in character and to produce an important neap tide intensification of the estuarine circulation. Despite stronger atmospheric momentum forcing in winter, the response is found to be less coherent with the winds than seen in previous studies of ice-free months. The tidal residuals show the cold intermediate layer in the estuary is renewed rapidly (14 days) in late March by the advection of a wedge of near-freezing waters from the Gulf of St. Lawrence. In situ processes appeared to play a lesser role in the renewal of this layer. In particular, significant wintertime deepening of the estuarine surface mixed layer was prevented by surface stability, which remained high throughout the winter. The observations also suggest that the bottom circulation was intensified during winter, with the intrusion in the deep layer of relatively warm Atlantic waters, such that the 3℃ isotherm rose from below 150 m to near 60 m.
机译：主要是由于缺乏观测，人们对圣劳伦斯河口冬季对强迫的反应的基本方面仍知之甚少。介绍了2002/03年冬季河口野战的结果。通过对温度，盐度，海平面和当前观测值的谐波分析，可以评估系统对潮汐强迫的响应。这些分析证实了先前存在半日内潮的证据，尽管其深度比以前在无冰期观察到的深度更大。低频潮汐流主要为斜压流，并引起河口环流的重要新生潮。尽管冬季强迫大气的动量更大，但发现其响应与风相比以前的无冰期研究不那么连贯。潮汐残留表明，三月下旬，由于圣劳伦斯湾的近冻结水楔入平流，河口的中间中间层迅速更新（14天）。原位过程似乎在更新该层中的作用较小。特别是，河口表面混合层的冬季显着加深被表面稳定性所阻止，表面稳定性在整个冬季仍然很高。观测还表明，冬季底部水流加剧，侵入了相对温暖的大西洋深水层，使3℃等温线从150 m以下升至60 m附近。

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