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我们使用三维波罗的海模型模拟的做法进行了一项波罗的海水团环流的研究。来自北大西洋的咸水经丹麦海峡流入波罗的海,在波罗的海上涌并与从各河流流入的淡水混合形成“波罗的海高盐传送带”。我们利用翻转流量函数和拉格朗日轨迹线对来自大贝尔特和厄勒海峡的咸水与淡水的混合情况进行了调查。该翻转流量函数被作为一种具有4个不同垂直坐标(深度、盐度、温度和密度)的函数进行计算,以便了解水的路径以及它在什么地方上涌并混合。在波罗的海本体内发现了与南大洋中的迪肯环流(Deacon Cell)类似的虚拟深度翻转环流的存在,它与哥特兰岛附近的旋转环流相符,当翻转流量函数投射在密度层上时,这一虚拟深度翻转环流就消失了。我们已经开展了一项拉格朗日轨迹线研究,以便更好地认识该环流以及咸水与淡水的混合情况。对这些水团在波罗的海中的停留时间的计算结果为26～29年,而拉格朗日扩散在5年后达到海盆饱和。
We used a three-dimensional Baltic model to simulate a Baltic Sea water circulation study. Saltwater from the North Atlantic flows into the Baltic Sea via the Danish Strait, surges over the Baltic Sea and mixes with fresh water flowing in from various rivers to form the “Baltic Belt”. We investigated the mix of saltwater and freshwater from the Greater Belts and the Oresund Strait using flipped flow functions and Lagrangian traces. The tumble flow function is calculated as a function of 4 different vertical coordinates (depth, salinity, temperature and density) in order to understand the water’s path and where it is upwelling and mixing. In the Baltic ontology, the existence of a virtual deep inversion loop similar to the Deacon Cell in the Southern Ocean was found to coincide with the rotational circulation near Gotland. When the flipped flow function is projected onto the density layer, This virtual depth flip loop disappears. We have conducted a Lagrangian trajectory study to better understand the circulation and the mix of salt and freshwater. The dwell time for these water masses in the Baltic Sea is calculated from 26 to 29 years, while the Lagrange diffusion reaches sea-basin saturation after 5 years.