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首页> 外文期刊>Ocean Dynamics >Mixed layer depth (MLD) variability in the southern Bay of Biscay. Deepening of winter MLDs concurrent with generalized upper water warming trends?
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Mixed layer depth (MLD) variability in the southern Bay of Biscay. Deepening of winter MLDs concurrent with generalized upper water warming trends?

机译：比斯开湾南部的混合层深度（MLD）变异性。冬季MLD的加深与普遍的上层水变暖趋势同时出现？

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Mixed layer depth (MLD) variability from seasonal to decadal time scales in the Bay of Biscay is studied in this work. A hydrographic time series running since 1991 in the study area, a climatology of the upper layer vertical structure based on the topology of this temperature profile time series and a onedimensional water column model have been used for this purpose. The prevailing factors driving MLD variability have been determined with detail, and agreement with observations is achieved. Tests carried out to investigate climatological profile skill to reproduce the upper layer temporal evolution have demonstrated its ability to simulate variability at seasonal time scales and reproduce the most conspicuous events observed.This has enabled us to carry out a reconstruction of the MLD variability for the last 60 years in the study area. Favourable sequence of intense mixing events explains interannual differences and cases of extraordinary deepening of winter mixed layer. The negative phase of the Eastern Atlantic pattern seems to determine important interannual variability through intense episodes of cooling and mixing as in winter 2005 in the Bay of Biscay. Low-frequency variability is also observed. A very striking and unexpected shallower winter MLD during the 1970s and 1980s than those observed from 1995 has been found. Simulation results support this counter-intuitive outcome of shallower winter mixed layers concurrent with generalized upper water warming trends reported on several occasions for the area. The long-term trends in MLD seem related with decadal variability in the North Atlantic Oscillation, being in phase and opposition with other deepening-shallowing cycles found from subtropicalto-subpolar areas in the North Atlantic.
机译：在这项工作中研究了比斯开湾从季节到年代际尺度的混合层深度（MLD）变化。为此，从1991年开始在研究区域内运行水文时间序列，基于该温度剖面时间序列的拓扑结构的上层垂直结构的气候学和一维水柱模型。已详细确定了驱动MLD变异性的主要因素，并与观察结果达成了一致。旨在调查气候廓线技能以重现上层时间演变的测试已证明其具有模拟季节性时标变化和重现观察到的最明显事件的能力，这使我们能够对最后一个MLD变异性进行重建在研究领域已有60年的历史。有利的强烈混合事件序列解释了年际差异和冬季混合层异常加深的情况。东大西洋格局的负相似乎决定了重要的年际变化，如2005年冬季在比斯开湾的剧烈降温和混合现象。还观察到低频变化。已经发现，1970年代和1980年代的冬季MLD比1995年的观测到的更令人震惊且出乎意料的浅层MLD。模拟结果支持了这种较浅的冬季混合层的反直觉结果，同时该地区多次报道了普遍的上层水变暖趋势。 MLD的长期趋势似乎与北大西洋涛动的年代际变化有关，与北大西洋亚热带至亚极地区发现的其他深化-浅化周期同相并相反。

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