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首页> 外文会议>2014 IEEE/OES Baltic International Symposium : Measuring and modeling of multi-scale interactions in the marine environment: Book of abstracts >Features of summertime circulation in the Gulf of Riga (A numerical simulation)
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Features of summertime circulation in the Gulf of Riga (A numerical simulation)

机译：里加湾夏季环流的特征（数值模拟）

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摘要

A regional, 0.5 n.m. and 20 sigma layer grid model of the Gulf of Riga (GoR) was implemented based on the Princeton Ocean Model code with initial conditions and atmospheric forcing taken from HIROMB and HIRLAM output. A basic run that covers an ice-free period of May 1–December 31, 2012, brought the following results: — the mean summertime surface circulation in GoR displays a whole-basin anticyclonic gyre with more intense currents in the western half of the gyre; — two seasonal currents are identified: the Northern Longshore Current (NLC) in the western part of GoR and the Southern Subsurface Longshore Current in the eastern part of GoR; — in the cold season of the year (when seasonal pycnocline is absent), the anticyclonic gyre in GoR is replaced by a cyclonic gyre. The seasonal change in sign of the whole-basin surface circulation in GoR is likely controlled by the NLC, a baroclinic jet-like current formed along the western shore in summer due to the prevalence of southwesterly, upwelling-favored winds, and presence of seasonal stratification that can be approximated as a two-layer vertical structure; this baroclinic jet disappears in winter when the seasonal pycnocline is absent
机译：区域性，下午0.5点基于普林斯顿海洋模型代码，并从HIROMB和HIRLAM输出中获取了初始条件和大气强迫，从而实现了里加湾（GoR）的20 sigma层网格模型。 2012年5月1日至12月31日的无冰期基本运行带来以下结果：— GoR的夏季平均地表环流显示了整个盆地的反气旋回旋，在回旋的西半部洋流更强; —确定了两个季节性潮流：GoR西部的北部长岸海流（NLC）和GoR东部的南部地下长岸海流； —在一年的寒冷季节（不存在季节性比诺可林时），GoR中的反气旋回旋被旋风回旋代替。 NLC可能控制了GoR整个盆地表面循环的季节变化，由于西南风的盛行，夏季上升气流和夏季季节的出现，夏季沿西海岸形成了斜压射流状的水流。分层，可以近似为两层垂直结构；当缺少季节性比诺可林时，这种斜压射流在冬季消失

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