The Seasonal Effects of ENSO on European Precipitation: Observational Analysis
The Seasonal Effects of ENSO on European Precipitation: Observational Analysis
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DOI：
10.1175/jcli-d-14-00008.1
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发表时间：
2014-08
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
本文分析和刻画了ENSO与西欧降水以及北大西洋和欧洲大气状况之间的大气遥相关的季节变化。与ENSO相关的显著降水变化在北部春季和秋季明显，在北部夏季边缘，在北部冬季没有。春季和秋季降水异常伴随着北大西洋和欧洲大尺度场与ENSO相关的统计显著变化。这些季节性遥相关似乎是由欧洲沿岸对流层上层条件的变化所调节的，这些对流层条件向下投射到对流层下部，并根据季节的不同产生陆上或近海水汽通量异常。在秋季和冬季，风暴活动中与ENSO有关的一些变化也很明显。北半球冬季的分析表明，重合的ENSO条件对欧洲降水或美国降水的影响都很小。
AbstractAn analysis and characterization of seasonal changes in the atmospheric teleconnection between ENSO and western European precipitation, as well as atmospheric conditions over the North Atlantic and Europe, are presented. Significant ENSO-associated changes in precipitation are evident during the boreal spring and fall seasons, marginal during boreal summer, and absent during boreal winter. The spring and fall precipitation anomalies are accompanied by statistically significant ENSO-related changes in large-scale fields over the North Atlantic and Europe. These seasonal teleconnections appear to be mediated by changes in upper tropospheric conditions along the coast of Europe that project down to the lower troposphere and produce onshore or offshore moisture flux anomalies, depending on the season. Some ENSO-related changes in storm activity are also evident during fall and winter. Analyses during boreal winter reveal little effect of coincident ENSO conditions on either European precipitation or u...