An outsized role for the Labrador Sea in the multidecadal variability of the Atlantic overturning circulation.
An outsized role for the Labrador Sea in the multidecadal variability of the Atlantic overturning circulation.
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DOI：
10.1126/sciadv.abh3592
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发表时间：
2021-10-08
期刊：
影响因子：
13.6
通讯作者：
Zhang S
中科院分区：
文献类型：
--
作者：
Yeager S;Castruccio F;Chang P;Danabasoglu G;Maroon E;Small J;Wang H;Wu L;Zhang S
拉布拉多海强迫可以主导几十年的AMOC变化，即使贡献最小的平均环流强度。气候模式是研究北大西洋与大西洋纬向翻转环流（AMOC）变化相关的内在变率的基本工具，但最近的观测对强调拉布拉多海过程重要性的模式的保真度提出了质疑。解决海洋中尺度涡旋的多世纪前工业气候模拟具有关键观测到的副极地大西洋现象的现实代表性，包括东副极地环流中密度空间翻转的主导地位，从而为解释短期观测记录提供了独特可信的背景。尽管在拉布拉多海的平均表面diapycnal转换弱，几十年的AMOC变化可以追溯到异常生产的密集拉布拉多海水与浮力迫使在西部副极地环流发挥了重大的驱动作用。
Labrador Sea forcing can dominate multidecadal AMOC variability even while contributing minimally to mean circulation strength. 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.
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