The Seasonal Effects of ENSO on Atmospheric Conditions Associated with European Precipitation: Model Simulations of Seasonal Teleconnections
The Seasonal Effects of ENSO on Atmospheric Conditions Associated with European Precipitation: Model Simulations of Seasonal Teleconnections
复制标题
ENSO 对与欧洲降水相关的大气条件的季节性影响：季节遥相关的模型模拟
DOI：
10.1175/jcli-d-12-00734.1
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发表时间：
2014
影响因子：
4.9
通讯作者：
J. Shaman
中科院分区：
文献类型：
--
作者：
J. Shaman
通过一系列模式试验，探讨了ENSO与北大西洋/欧洲地区之间的季节性高层遥相关。正压涡度方程模式在一年中的每个季节的气候条件下被线性化，并在赤道太平洋上应用散度强迫来模拟与厄尔尼诺有关的对流活动。在北半球的秋季、冬季和春季，这种强迫同样会激发向东北方向传播的静止正压Rossby波列，该波列穿过北大西洋延伸到欧洲海岸。北大西洋喷气式飞机出口附近的不列颠群岛上空出现了强烈的异常。北半球夏季的解决方案不会产生清晰的波列；然而，存在北大西洋响应的证据，因为信号既向东传播，也向西传播。大西洋和欧洲的这些直接响应与北半球春季和秋季观测到的与ENSO相关的异常定性上相似，但在结构上都不同。
AbstractThe seasonal upper-tropospheric teleconnection between ENSO and the North Atlantic/European sector is explored through a series of model experiments. A barotropic vorticity equation model is linearized about climatological conditions for each season of the year, and divergence forcing is applied over the equatorial Pacific to mimic El Nino–related convective activity. During boreal fall, winter, and spring, this forcing similarly excites a northeastward-propagating stationary barotropic Rossby wave train that extends across the North Atlantic to the European coast. Strong anomalies develop over the British Isles in the vicinity of the North Atlantic jet exit. Solutions during boreal summer produce no clear wave train; however, evidence exists for a North Atlantic response because of both eastward- and westward-propagating signals. These direct responses over the Atlantic and Europe are qualitatively similar to observed ENSO-associated anomalies during boreal spring and fall, but differ structurall...