Climate Response to Basin-Scale Warming and Cooling of the North Atlantic Ocean
Climate Response to Basin-Scale Warming and Cooling of the North Atlantic Ocean
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DOI：
10.1175/jcli4038.1
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发表时间：
2007-03
影响因子：
4.9
通讯作者：
R. Sutton;D. Hodson
中科院分区：
文献类型：
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作者：
R. Sutton;D. Hodson
摘要利用大气环流模式试验研究了北大西洋海盆尺度变暖或变冷对气候的影响。这种模式的多年代际波动在20世纪被观察到，类似的变化——但幅度更大——被认为在更遥远的过去发生过。研究发现，在所有季节中，热带地区对北大西洋变暖的反应最为强烈，信噪比最高。然而，气候影响存在较大的季节周期。最强烈的反应出现在北方夏季，与南北美洲低纬度地区降水减少和气温升高有关。在8 - 9 - 10月，大西洋飓风主要发展区域的垂直切变显著减少。在冬季和春季，温带地区的陆地温度异常受环流动态变化的控制。
Abstract Using experiments with an atmospheric general circulation model, the climate impacts of a basin-scale warming or cooling of the North Atlantic Ocean are investigated. Multidecadal fluctuations with this pattern were observed during the twentieth century, and similar variations—but with larger amplitude—are believed to have occurred in the more distant past. It is found that in all seasons the response to warming the North Atlantic is strongest, in the sense of highest signal-to-noise ratio, in the Tropics. However there is a large seasonal cycle in the climate impacts. The strongest response is found in boreal summer and is associated with suppressed precipitation and elevated temperatures over the lower-latitude parts of North and South America. In August–September–October there is a significant reduction in the vertical shear in the main development region for Atlantic hurricanes. In winter and spring, temperature anomalies over land in the extratropics are governed by dynamical changes in circ...