Coupled Modes of North Atlantic Ocean-Atmosphere Variability and the Onset of the Little Ice Age
Coupled Modes of North Atlantic Ocean-Atmosphere Variability and the Onset of the Little Ice Age
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DOI：
10.1029/2019gl084350
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发表时间：
2019-11-07
影响因子：
5.2
通讯作者：
Wilson, Rob
中科院分区：
文献类型：
--
作者：
Anchukaitis, Kevin J.;Cook, Edward R.;Wilson, Rob
北美、欧洲和地中海的极端水文气候与大西洋的海洋和大气环流异常有关，但仪器记录的有限长度阻止了对这些协变模式的完全识别和表征，特别是在十年到百年的时间尺度上。在这里，我们分析了干旱变化的耦合模式在北大西洋盆地的两侧，使用独立的气候场重建跨越上个千年，以检测和属性的连贯流域范围内的水分异常的时代，海洋和大气过程。大尺度湿度变化的主导模式的特点是北大西洋大气环流和海面温度的不同模式。我们推断北大西洋涛动和寒冷的大西洋海面温度在第十五世纪中期的负相，与较弱的太阳辐照度一致，并在强烈的火山强迫与早期的小冰期。
Hydroclimate extremes in North America, Europe, and the Mediterranean are linked to ocean and atmospheric circulation anomalies in the Atlantic, but the limited length of the instrumental record prevents complete identification and characterization of these patterns of covariability especially at decadal to centennial time scales. Here we analyze the coupled patterns of drought variability on either sides of the North Atlantic Ocean basin using independent climate field reconstructions spanning the last millennium in order to detect and attribute epochs of coherent basin-wide moisture anomalies to ocean and atmosphere processes. A leading mode of broad-scale moisture variability is characterized by distinct patterns of North Atlantic atmosphere circulation and sea surface temperatures. We infer a negative phase of the North Atlantic Oscillation and colder Atlantic sea surface temperatures in the middle of the fifteenth century, coincident with weaker solar irradiance and prior to strong volcanic forcing associated with the early Little Ice Age.