Yeager Stephen, Castruccio Fred, Chang Ping, Danabasoglu Gokhan, Maroon Elizabeth, Small Justin, Wang Hong, Wu Lixin, Zhang Shaoqing
National Center for Atmospheric Research, Boulder, CO, USA.
International Laboratory for High Resolution Earth System Prediction, College Station, TX, USA.
Sci Adv. 2021 Oct 8;7(41):eabh3592. doi: 10.1126/sciadv.abh3592. Epub 2021 Oct 6.
Climate models are essential tools for investigating intrinsic North Atlantic variability related to variations in the Atlantic meridional overturning circulation (AMOC), but recent observations have called into question the fidelity of models that emphasize the importance of Labrador Sea processes. A multicentury preindustrial climate simulation that resolves ocean mesoscale eddies has a realistic representation of key observed subpolar Atlantic phenomena, including the dominance of density-space overturning in the eastern subpolar gyre, and thus provides uniquely credible context for interpreting short observational records. Despite weak mean surface diapycnal transformation in the Labrador Sea, multidecadal AMOC variability can be traced to anomalous production of dense Labrador Sea Water with buoyancy forcing in the western subpolar gyre playing a substantial driving role.
气候模型是研究与大西洋经向翻转环流（AMOC）变化相关的北大西洋内在变率的重要工具，但最近的观测对强调拉布拉多海过程重要性的模型的逼真度提出了质疑。一个解析海洋中尺度涡旋的多世纪工业化前气候模拟，对观测到的关键亚极地大西洋现象有逼真的呈现，包括在东部亚极地环流中密度空间翻转的主导地位，因此为解释短期观测记录提供了独特可信的背景。尽管拉布拉多海的平均表面斜压转换较弱，但年代际AMOC变率可追溯到拉布拉多海高密度水的异常生成，其中亚极地西部环流中的浮力强迫起到了重要驱动作用。
