The absence of an Atlantic imprint on the multidecadal variability of wintertime European temperature.
The absence of an Atlantic imprint on the multidecadal variability of wintertime European temperature.
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DOI：
10.1038/ncomms10930
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发表时间：
2016-03-15
影响因子：
16.6
通讯作者：
Palter JB
中科院分区：
文献类型：
--
作者：
Yamamoto A;Palter JB
北方半球气候对北大西洋海表温度（SST）的年代际变化敏感。因此，令人惊讶的是，这种变化的印记是明显缺乏在冬季西欧的温度，尽管欧洲的气候是强烈的影响，其邻近的海洋，在流域平均SST的多年变化持续在所有季节。在这里，我们将这种缺失印记的原因追溯到大气环流的动态异常，该异常掩盖了其对SST异常的热力学反应。具体而言，路径拉格朗日粒子采取欧洲在异常SST冬季抑制预期的波动积累沿着这些轨迹的海气热交换的差异。由于北大西洋平均SST的年代际变化可能部分由大西洋经向翻转环流（AMOC）驱动，因此大气对这种变化模式的动力学调整可能对欧洲冬季温度对预计的世纪AMOC下降的响应具有重要意义。 从西欧的温度记录中明显缺乏北大西洋海面温度信号，这仍然是一个异常现象。在这里，作者表明，这是由于动态大气环流异常，抑制了预期的热力学响应。
Northern Hemisphere climate responds sensitively to multidecadal variability in North Atlantic sea surface temperature (SST). It is therefore surprising that an imprint of such variability is conspicuously absent in wintertime western European temperature, despite that Europe's climate is strongly influenced by its neighbouring ocean, where multidecadal variability in basin-average SST persists in all seasons. Here we trace the cause of this missing imprint to a dynamic anomaly of the atmospheric circulation that masks its thermodynamic response to SST anomalies. Specifically, differences in the pathways Lagrangian particles take to Europe during anomalous SST winters suppress the expected fluctuations in air–sea heat exchange accumulated along those trajectories. Because decadal variability in North Atlantic-average SST may be driven partly by the Atlantic Meridional Overturning Circulation (AMOC), the atmosphere's dynamical adjustment to this mode of variability may have important implications for the European wintertime temperature response to a projected twenty-first century AMOC decline. The conspicuous absence of a North Atlantic sea surface temperature signature from western European temperature records remains an anomaly. Here, the authors show that this is due to a dynamic atmospheric circulation anomaly that suppresses the expected thermodynamic response.