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首页> 外文期刊>Geophysical Research Letters >The deepening of the Atlantic water in the Lofoten Basin of the Norwegian Sea, demonstrated by using an active reduced gravity model - art. no. L01306
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The deepening of the Atlantic water in the Lofoten Basin of the Norwegian Sea, demonstrated by using an active reduced gravity model - art. no. L01306

机译：挪威海罗弗敦海盆大西洋水的深化，通过使用主动降重力模型进行了展示-艺术。没有。 L01306

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摘要

The Norwegian Atlantic Current (NwAC) as a poleward eastern boundary current is to be considered as the northern limb of the Meridional Overturning Circulation in the North Atlantic (MOC). It transports warm and saline Atlantic water (AW) northward toward the Arctic Ocean, before cooling and mixing with cold and low saline water masses return it to the North Atlantic to contribute in the MOC. In this study we focus on the AW in the Lofoten Basin (LB) of the Norwegian Sea (NS), where it occupies a wider and deeper domain than farther south and north. It comprises the major heat-reservoir in the NS with contact with the atmosphere, and as such is an important area for cooling and buoyancy loss. We show that the deepening of the AW is mainly caused by the reduced northward flow in the LB, manifested in the deep counter- current encountered by the Polar frontal jet. We demonstrate this effect by using an active reduced gravity model with a topographically-steered deeper flow. To achieve maintenance of volume transport, the model shows that observed differences must be balanced by an oppositely-directed deeper flow in the LB. The ocean appears to achieve maintenance of volume transport of AW due to buoyancy loss and varying deeper currents, by adjusting the vertical extension of AW, resulting in a substantial deepening in the LB. Based on the good fit between the model and observations, the suggested mechanism appears to be credible and feasible. [References: 14]
机译：挪威大西洋洋流（NwAC）作为极东边界水流，应被视为北大西洋子午翻转环流（MOC）的北肢。它先将温暖的含盐水的大西洋水（AW）向北输送到北冰洋，然后冷却并与冷的低盐水混合，然后将其返回北大西洋，以促进MOC。在这项研究中，我们重点研究挪威海（NS）的罗弗敦盆地（LB）的AW，它比更南端和北端占据的区域更广，更深。它包括与大气接触的北半球主要储热库，因此是冷却和浮力损失的重要区域。我们表明，AW的加深主要是由于LB的向北流动减少，这表现在极地额流急流遇到的深逆流中。我们通过使用具有地形转向的更深流的主动降重力模型来证明这种效果。为了维持体积运输，该模型显示必须通过LB中相反方向的更深流来平衡观察到的差异。通过调整AW的垂直延伸，海洋似乎由于浮力损失和变化的深流而实现了AW的体积运输的维持，从而导致LB的大幅加深。基于模型与观测值之间的良好拟合，建议的机制似乎是可信且可行的。 [参考：14]

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