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首页> 外文期刊>Ocean Dynamics >Study on subtidal circulation and variability in the Gulf of St. Lawrence, Scotian Shelf, and Gulf of Maine using a nested-grid shelf circulation model
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Study on subtidal circulation and variability in the Gulf of St. Lawrence, Scotian Shelf, and Gulf of Maine using a nested-grid shelf circulation model

机译：利用嵌套网格架子环流模型研究圣劳伦斯湾，斯科蒂陆架和缅因湾的潮汐环流及其变化

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This paper examines the subtidal circulation and associated variability in the Gulf of St. Lawrence, the Scotian Shelf, and the Gulf of Maine (GSL-SS-GOM) in 1988-2004 based on results produced by a nested-grid shelf circulation model. The model has a fine-resolution child model (～(1/12)°) embedded inside a coarse-resolution parent model (～(1/4)°) of the northwest Atlantic. The combination of the semi-prognostic method and the spectral nudging method is used to reduce the model seasonal bias and drift. The child model reproduces the general features of the observed circulation and hydrography over the study region during the study period. The child model results demonstrate that the time-mean circulation in the GSL is affected by the time-mean atmospheric forcing and inflow through the Strait of Belle Isle. The temporal variability in atmospheric forcing affects the outflow through western Cabot Strait, which in turn affects the transport of the Nova Scotian Current and the gulf-wide cyclonic circulation in the GOM. The simulated seasonal variability of salinity in the top 30 m of the GSL-SS-GOM is mainly affected by the equatorward advection of low-salinity waters from the lower St. Lawrence Estuary to the GOM through the Scotian Shelf. The simulated intraseasonal variability of circulation in the GSL is affected by the variability in the estuarine circulation in response to the temporal variability in atmospheric forcing. On the Scotian Shelf, the intraseasonal variability is mainly driven by the variability of wind forcing and mesoscale and nonlinear dynamics over the shelf break and slope region. The interannual variability in the simulated temperature and salinity are spatially coherent in the intermediate waters in the GSL, which is caused partially by the local response to atmospheric variability and partially by variabilities over the southern Newfoundland Shelf that enter the GSL through the eastern Cabot Strait. By comparison, on the Scotian Shelf, the interannual variability of simulated circulation is affected by anomalies produced by the nonlinear dynamics which are advected equatorwards by the shelf break jet.
机译：本文根据嵌套网格架子环流模型得出的结果，研究了1988-2004年圣劳伦斯湾，斯科特陆架和缅因州海湾（GSL-SS-GOM）的潮汐环流及其相关的变化性。该模型在西北大西洋的粗分辨率母模型（〜（1/4）°）中嵌入了一个高分辨率的子模型（〜（1/12）°）。半预测方法和频谱微调方法相结合，可减少模型的季节性偏差和漂移。儿童模型再现了研究期间在研究区域内观察到的循环和水文的一般特征。儿童模型结果表明，GSL中的时均环流受到时均大气强迫和流经Belle Isle海峡的时间的影响。大气强迫的时间变化会影响通过西部卡伯特海峡的流出，进而影响新斯科舍海流的输送和GOM中的整个海湾气旋循环。 GSL-SS-GOM顶部30 m的盐度模拟季节性变化主要受低盐度水从赤道口低平流平流的影响，该低盐度水从较低的圣劳伦斯河口通过斯科特陆架到达GOM。 GSL中模拟的季节内环流变化受河口环流响应大气强迫的时间变化的变化影响。在Scotian架上，季节内的变化主要是由风强迫和中尺度的变化以及架子断裂和斜坡区域的非线性动力学驱动的。 GSL中间水域中模拟温度和盐度的年际变化在空间上是连贯的，这部分是由于对大气变化的局部响应，部分是通过从南部卡伯特海峡进入GSL的纽芬兰大陆架的变化。相比之下，在斯科蒂陆架上，模拟环流的年际变化受到非线性动力学产生的异常的影响，这些异常由架子破裂射流向赤道平移。

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