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首页> 外文期刊>Ocean Science Discussions >Descent and mixing of the overflow plume from Storfjord in Svalbard: an idealized numerical model study
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Descent and mixing of the overflow plume from Storfjord in Svalbard: an idealized numerical model study

机译：斯瓦尔巴特群岛Storfjord溢流羽流的下降和混合：理想的数值模型研究

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Storfjorden in the Svalbard Archipelago is a sill-fjord that produces significant volumes of dense, brine-enriched shelf water through ice formation. The dense water produced in the fjord overflows the sill and can reach deep into the Fram Strait. For conditions corresponding to a moderate ice production year, the pathway of the overflow, its descent and evolving water mass properties due to mixing are investigated for the first time using a high resolution 3-D numerical model. An idealized modeling approach forced by a typical annual cycle of buoyancy forcing due to ice production is chosen in a terrain-following vertical co-ordinate. Comparison with observational data, including hydrography, fine resolution current measurements and direct turbulence measurements using a microstructure profiler, gives confidence on the model performance. The model eddy diffusivity profiles contrasted to those inferred from the turbulence measurements give confidence on the skill of the Mellor Yamada scheme in representing sub-grid scale mixing for the Storfjorden overflow, and probably for gravity current modeling, in general. The Storfjorden overflow is characterized by low Froude number dynamics except at the shelf break where the plume narrows, accelerates with speed reaching 0.6 m s?1, yielding local Froude number in excess of unity. The volume flux of the plume increases by five-fold from the sill to downstream of the shelf-break. Rotational hydraulic control is not applicable for transport estimates at the sill using upstream basin information. To the leading order, geostrophy establishes the lateral slope of the plume interface at the sill. This allows for a transport estimate that is consistent with the model results by evaluating a weir relation at the sill.
机译：斯瓦尔巴群岛的斯托弗约登（Storfjorden）是基尔峡湾，通过结冰产生大量致密的，富含盐水的架子水。峡湾中产生的浓水使门槛溢出，并可以深入到弗拉姆海峡。对于对应于适度制冰年的条件，首次使用高分辨率3-D数值模型研究了溢流的路径，其下降和因混合引起的水质变化。在地形跟随的垂直坐标中，选择了一种理想的建模方法，该方法是由于冰的产生而产生的典型的年度浮力强迫所强迫的。与观测数据的比较，包括水文学，精细分辨率的电流测量和使用微结构轮廓仪的直接湍流测量，对模型的性能充满信心。与涡流测量得出的模型相比，模型涡流扩散率剖面使人们对Mellor Yamada方案在代表Storfjorden溢流和重力流建模的子网格比例混合技术方面的技巧充满信心。 Storfjorden溢流的特征在于弗洛德数动力学特性低，除了在架子断裂处羽流变窄之外，其速度达到0.6 m s ？1 时会加速，从而导致当地弗洛德数超过了单位。从门槛到搁板断裂的下游，羽流的体积通量增加了五倍。使用上游流域信息，旋转液压控制不适用于门槛处的运输量估算。首先，地球动力学在门槛处建立羽状界面的侧向坡度。通过评估门槛处的堰关系，可以得出与模型结果一致的运输估计。

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