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首页> 外文期刊>Ocean science >Can the boundary profiles at 26° N be used to extract buoyancy-forced Atlantic Meridional Overturning Circulation signals?
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Can the boundary profiles at 26° N be used to extract buoyancy-forced Atlantic Meridional Overturning Circulation signals?

机译：26°N的边界轮廓可以用于提取强制性的大西洋经络推翻循环信号吗？

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The temporal variability of the Atlantic Meridional Overturning Circulation (AMOC) is driven both by direct wind stresses and by the buoyancy-driven formation of North Atlantic Deep Water over the Labrador Sea and Nordic Seas. In many models, low-frequency density variability down the western boundary of the Atlantic basin is linked to changes in the buoyancy forcing over the Atlantic subpolar gyre (SPG) region, and this is found to explain part of the geostrophic AMOC variability at 26° N. In this study, using different experiments with an ocean general circulation model (OGCM), we develop statistical methods to identify characteristic vertical density profiles at 26° N at the western and eastern boundaries, which relate to the buoyancy-forced AMOC. We show that density anomalies due to anomalous buoyancy forcing over the SPG propagate equatorward along the western Atlantic boundary (through 26° N), eastward along the Equator, and then poleward up the eastern Atlantic boundary. The timing of the density anomalies appearing at the western and eastern boundaries at 26° N reveals ～ 2–3-year lags between boundaries along deeper levels (2600–3000 m). Record lengths of more than 26?years are required at the western boundary (WB) to allow the buoyancy-forced signals to appear as the dominant empirical orthogonal function (EOF) mode. Results suggest that the depth structure of the signals and the lagged covariances between the boundaries at 26° N may both provide useful information for detecting propagating signals of high-latitude origin in more complex models and potentially in the observational RAPID (Rapid Climate Change programme) array. However, time filtering may be needed, together with the continuation of the RAPID programme, in order to extend the time period.
机译：大西洋经络翻转循环（AMOC）的时间可变性是通过直接风力胁迫和北大西洋深水在拉布拉多海和北欧海域的浮力驱动的形成。在许多型号中，大西洋盆地的西部边界下的低频密度可变性与浮力的变化有关，迫使大西洋副血基（SPG）区域，这是在26°处解释出色血管型变异性的一部分N.在本研究中，使用与海洋通用循环模型（OGCM）的不同实验，我们开发统计方法，以识别西部和东部边界的26°N识别特征垂直密度型材，这与强制性的武装有关。我们表明密度异常由于异常浮力，强迫SPG沿着西部大西洋边界（通过26°N），沿着赤道向东传播，然后向东大西洋边界升起。 26°N在西方和东部边界处出现的密度异常的时间显示沿着更深层次（2600-3000米）之间的边界之间的〜2-3年滞后。在西部边界（WB）中需要超过26岁的记录长度，以允许强制信号显示为主要的经验正交功能（EOF）模式。结果表明，26°N的边界之间信号的深度结构和滞后的协方差可以提供用于检测在更复杂的模型中的高纬度来源的传播信号的有用信息，并且可能在观察快速（快速气候变化计划中）大批。然而，可能需要时间过滤，以及快速程序的延续，以延长时间段。

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