Cooling of the West Spitsbergen Current: AUV-based turbulence measurements west of Svalbard
Cooling of the West Spitsbergen Current: AUV-based turbulence measurements west of Svalbard
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西斯匹次卑尔根洋流的冷却：基于 AUV 的斯瓦尔巴群岛西部湍流测量
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发表时间：
2012
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通讯作者：
C. Griffiths
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作者：
E. Steele;T. Boyd;M. Inall;E. Dumont;C. Griffiths
湍流在全球海洋的热量和盐份重新分配方面，特别是在高纬度海洋的边界流中，起着至关重要的作用。在北冰洋，西斯匹次卑尔根海流将源自大西洋的温暖盐水沃茨向北输送，这是输送到北极欧亚海盆的海洋热量的最大来源，可能对海冰减少的速度产生重大影响。虽然WSC进入北冰洋的入口点附近的快速下游冷却是众所周知的，但这种热通量发生的过程仍然是一个积极的研究领域。在2010年7月对斯瓦尔巴群岛地区的巡航中，使用了一艘配备有前置微结构组件的Hydroid REMUS 600米自主式潜水器，以量化WSC内部和整个海岸边缘的湍流混合水平。配备微结构的AUV被用来测量水的性质和湍流参数的水平剖面，而一个更传统的，垂直自由下落的微结构剖面仪被用来进行跨WSC的边缘的垂直剖面测量的补充横断面。在这项研究中，我们评估所得到的测量结果，并比较了来自安装在两个非常不同的平台上的类似传感器的上层海洋的意见：一个视图组装从传统的垂直剖面和第二个从水平，基于AUV的配置文件。我们讨论了混合对冷却的WSC和这些平台的能力，以解决小规模的变化，在垂直和水平的影响。
The role of turbulence is critical in the redistribution of heat and salt throughout the global ocean, and in boundary currents of the high-latitude oceans in particular. In the Arctic Ocean, warm, saline waters of Atlantic origin, which are carried northwards by the West Spitsbergen Current (WSC), are the largest source of oceanic heat carried into the Arctic Eurasian basin, and may have a significant impact on the rate of sea ice decline. While the rapid down-stream cooling of the WSC around its entry point into the Arctic Ocean is well-known, the processes by which this heat flux occurs are still an area of active research. During a cruise to the Svalbard region in July 2010, a Hydroid REMUS 600m AUV, equipped with a forward-mounted microstructure package, was used to quantify the level of turbulent mixing within and across the shoreward edge of the WSC. The microstructure-equipped AUV was used to measure horizontal profiles of water properties and turbulence parameters while a more-conventional, vertically free-falling microstructure profiler was used to conduct complementary transects of vertical profile measurements across the edge of the WSC. In this study we evaluate the resulting measurements and compare the views of the upper ocean derived from similar sensors mounted on two very different platforms: one view assembled from conventional vertical profiles and the second from horizontal, AUV-based profiles. We discuss the impact of mixing on the cooling of the WSC and the capacity of these platforms to resolve small-scale variability in both the vertical and the horizontal.