Wind-driven monthly variations in transport and the flow field in the Faroe–Shetland Channel
Wind-driven monthly variations in transport and the flow field in the Faroe–Shetland Channel
复制标题
法罗-设得兰海峡运输和流场受风驱动的每月变化
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
S. Østerhus
中科院分区：
文献类型：
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作者：
T. Sherwin;S. Hughes;W. Turrell;B. Hansen;S. Østerhus
从北大西洋通过法罗群岛-设得兰海峡到北欧海的水的运输是从十年的电导率，温度和深度（CTD）和声学多普勒海流剖面仪（ADCP）的数据进行分析。在500米高空积分的长期平均输送量为3.5 ± 0.1Sv（1 Sv = 106 m3 s-1），其中2.1Sv为正压流，1.4Sv为斜压流。短期变异性导致标准差为ca。2.2 ADCP测量的输送量的3天平均值中的Sv。正压输送位于设得兰群岛陆架斜坡区的上部，但有时在深水区扩大。有一个峰值表面斜压输送以上的脚的斜坡，和弱的再循环的修改北大西洋水（MNAW），从北方进入，在法罗群岛一侧。9月，当等压线在东侧下降时，强输送（约。4 Sv）是正压的，均匀分布在设得兰群岛斜坡上，来自法罗一侧的MNAW环流和中尺度活动都很弱。在春季，净输送量很小（约。2.5 Sv）时，MNAW环流较强，中尺度活动较大。这些季节性变化似乎与当地的西南风应力，这可能有助于近一半的长期运输的通道。
The transport of water from the North Atlantic to the Nordic seas through the Faroe–Shetland Channel is analysed from a decade of conductivity, temperature and depth (CTD) and acoustic Doppler current profiler (ADCP) data. The long-term mean transport, integrated over the upper 500 m, is 3.5 ± 0.1 Sv (1 Sv =106m3s-1), of which 2.1 Sv is barotropic flow and 1.4 Sv is baroclinic flow. Short-term variability leads to a standard deviation of ca. 2.2 Sv in 3-day averages of the ADCP-measured transport. The barotropic transport is located over the upper part of the slope region of the Shetland Shelf, but sometimes broadens over deeper water. There is a peak surface baroclinic transport above the foot of the slope, and a weak recirculation of Modified North Atlantic Water (MNAW), which enters from the north, on the Faroese side. In September, when isobars downwell on the eastern side, the strong transport (ca. 4 Sv) is barotropic and evenly distributed across the Shetland slope, and both recirculation of MNAW from the Faroe side and mesoscale activity are weak. In spring, the net transport is small (ca. 2.5 Sv), the MNAW recirculation is strong and mesoscale activity is relatively large. These seasonal variations appear to correlate with the local south-west wind stress, which may contribute to nearly half of the long-term transport in the channel.