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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >On the variability of the Mediterranean Outflow Water in the North Atlantic from 1948 to 2006
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On the variability of the Mediterranean Outflow Water in the North Atlantic from 1948 to 2006

机译：1948年至2006年北大西洋地中海流出水的变化

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摘要

Recent work has shown that variability in the properties and/or transport of Mediterranean Seawaters spilling across the Strait of Gibraltar into the North Atlantic have had little impact on the variability of Mediterranean Outflow Water (MOW) in the that basin over the past fifty years. Here we investigate whether circulation changes are the dominant source of MOW variability in the North Atlantic between 1948 and 2006. Using a 1/3° North Atlantic configuration of the HYbrid Coordinate Ocean Model combined with the Marginal Sea Boundary Condition model, two simulations forced by either climatological or interannual atmospheric fields are performed. The interannual simulation reproduces the observed MOW variability without Mediterranean Seawater changes. Thus, we conclude that MOW variability in the last 60 years is a consequence of circulation changes in the North Atlantic. A series of simulations that separate the mechanical effect of the wind from the impact of buoyancy forcing show that MOW variability can be attributed to shifts between its dominant northward and westward pathways. The pathway shifts from predominantly northward between 1950 and 1975 to predominantly westward between 1975 and 1995 and finally back to northward after 1995. Though these pathway shifts appear to be wind‐induced, the property changes are caused by the combined impact of wind and buoyancy forcing on the circulation of the North Atlantic.
机译：最近的工作表明，过去五十年来，从直布罗陀海峡流入北大西洋的地中海海水的性质和/或运输变化对该盆地的地中海流出水（MOW）的变化影响很小。在这里，我们调查了1948年至2006年之间北大西洋环流变化是否是MOW变率的主要来源。结合混合坐标海洋模型的1/3°北大西洋构造，结合边际海边界条件模型，两个模拟被强迫。进行气候或年际大气场。年度模拟再现了观察到的MOW的变化，而地中海海水没有变化。因此，我们得出的结论是，近60年MOW的变化是北大西洋环流变化的结果。一系列模拟将风的机械效应与浮力强迫的影响分开，表明MOW的变异性可归因于其主导的北向和西向路径之间的转换。路径从1950年至1975年主要向北移动，而在1975年至1995年之间主要向西移动，最后在1995年之后返回北向。尽管这些路径移动似乎是风引起的，但属性变化是由风和浮力的共同作用引起的在北大西洋的环流。

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