Subpolar Atlantic Ocean mixed layer heat content variability is increasingly driven by an active ocean
Subpolar Atlantic Ocean mixed layer heat content variability is increasingly driven by an active ocean
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DOI：
10.1038/s43247-022-00433-6
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发表时间：
2022-05-18
影响因子：
7.9
通讯作者：
Sinha, Bablu
中科院分区：
文献类型：
--
作者：
Josey, Simon A.;Sinha, Bablu
北大西洋混合层的海洋热含量受到海洋热传输的影响，其程度与与大气的热交换的影响程度相同，这表明对观测结果的分析以及气候模型模拟。在其他地方普遍变暖的时候，副极地北大西洋上层的寒冷条件引起了重大争论。不确定性来自潜在原因（地表热损失和海洋环流变化）和特征时间尺度（年际到数十年）。解决这些不确定性非常重要，因为寒冷的天气与最近欧洲的极端天气和大西洋翻转环流的减少有关。利用高分辨率气候模型分析支持的观测结果，我们发现，除了表面热交换产生的异常之外，异常活跃的海洋还会定期产生寒冷和温暖的年际异常。此外，我们还确定了不同的海洋表面温度模式，这些模式表征了海洋或大气在特定年份中是否具有最强的影响力。将这些新见解应用到观测中，我们发现自 1960 年以来海洋在决定北大西洋混合层热含量变化方面的作用越来越大。
Ocean heat content in the North Atlantic mixed layer has been influenced by ocean heat transport to the same degree as by heat exchange with the atmosphere, suggest analyses of observations as well as climate model simulations.Cold conditions in the upper layer of the subpolar North Atlantic Ocean, at a time of pervasive warming elsewhere, have provoked significant debate. Uncertainty arises both from potential causes (surface heat loss and ocean circulation changes) and characteristic timescales (interannual to multidecadal). Resolution of these uncertainties is important as cold conditions have been linked to recent European weather extremes and a decline in the Atlantic overturning circulation. Using observations, supported by high resolution climate model analysis, we show that a surprisingly active ocean regularly generates both cold and warm interannual anomalies in addition to those generated by surface heat exchange. Furthermore, we identify distinct sea surface temperature patterns that characterise whether the ocean or atmosphere has the strongest influence in a particular year. Applying these new insights to observations, we find an increasing role for the ocean in setting North Atlantic mixed layer heat content variability since 1960.