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首页> 外文期刊>Journal of Physical Oceanography >Residual Flows in Cook Strait, a Large Tidally Dominated Strait
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Residual Flows in Cook Strait, a Large Tidally Dominated Strait

机译：库克海峡（一个以潮汐为主的海峡）的残留流量

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摘要

Flows at subtidal frequencies are resolved from 20 months of current observations at multiple sites across the narrows of Cook Strait, New Zealand. The substantial tidal flows (spring tides >3ms~(-1)) are challenging to measure with moored ADCPs. Along-strait residual flows are on the order of 0.05-0.1 m s~(-1), but there were differences across the strait and also through the annual cycle. The calculated net residual transport is -0.25 Sverdrups (Sv; 1 Sv = 10~6 m~3 s~(-1)) (i.e., negative sign implies to the south, from Tasman Sea to Pacific Ocean). This is smaller (by a factor of 2-3) than that estimated from previous sparse current measurements. Crucially, however, these new data also suggest that, over the austral summer-autumn period, there is persistent residual flow northward on the western side of the strait so that the summer-autumn net -0.15-Sv flow can be separated into +0.065-Sv westside and -0. 22-Sv eastside flow. This western northward flow had a seasonal bias, appearing only in the summer-autumn period. The observations also show persistent temperature stratification on the order of 2℃ over the full depth of the water column in this late summer-autumn period. An implication is that there is vertical shear influencing the residual flow estimates. A range of exchange flow scenarios are considered with the most extreme indicating that the flow on the western side of the strait in the January-June period might be as much as +0.08 Sv northward. This has substantial implications for regional circulation as well as for the nutrient supply for the nearby Marlborough Sounds.
机译：潮汐频率下的流量可以通过在新西兰库克海峡狭窄地区多个地点进行的20个月的当前观测得到解决。大量的潮汐流（春季潮汐> 3ms〜（-1））对于停泊的ADCP来说具有挑战性。海峡两岸的剩余流量约为0.05-0.1 m s〜（-1），但两岸之间以及整个年周期都存在差异。计算出的净残留迁移量为-0.25 Sverdrups（Sv; 1 Sv = 10〜6 m〜3 s〜（-1））（即负号表示从塔斯曼海到太平洋向南）。这比以前的稀疏电流测量结果估计的要小（约为2-3倍）。然而，至关重要的是，这些新数据还表明，在南秋季的夏季，海峡西侧向北存在持续的残余流量，因此夏秋季的净-0.15-Sv流量可分为+0.065。 -Sv西侧和-0。 22-Sv东流。这种西部向北流动具有季节性偏差，仅在夏秋期间出现。观测结果还表明，在这个夏末至秋季，水柱整个深度上的温度分层持续在2℃左右。这意味着存在垂直剪切力影响剩余流量估算。考虑了一系列交换流量情景，其中最极端的情况表明，一月至六月期间海峡西侧的流量可能向北最多+0.08 Sv。这对区域循环以及附近的马尔堡峡湾的营养供应具有重要意义。

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  • 来源
    《Journal of Physical Oceanography》 |2014年第6期|1654-1670|共17页
  • 作者

    Craig Stevens;

  • 作者单位

    Marine Physics Group, National Institute for Water and Atmospheric Research, Greta Point, 301 Evans Bay, Kilbirnie, Wellington 6021, New Zealand;

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