Contribution of the cold sector of extratropical cyclones to mean state features over the Gulf Stream in winter
Contribution of the cold sector of extratropical cyclones to mean state features over the Gulf Stream in winter
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DOI：
10.1002/qj.3058
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发表时间：
2017-04
影响因子：
8.9
通讯作者：
B. Vannière;A. Czaja;H. Dacre
中科院分区：
文献类型：
--
作者：
B. Vannière;A. Czaja;H. Dacre
最近的研究表明，中纬度海-气相互作用受到天气变化的强烈影响。本文研究了墨西哥湾流海表温度锋面上的海气相互作用如何在不同的天气系统中发生变化。重点分析了冬季与海温锋共处的三个大气平均状态特征的变化：海温锋暖侧上升和降水增强，风暴轴入口处低层斜压性增强。根据它们是出现在温带气旋的冷区还是出现在任何其他天气特征中，这三个场被划分为。这项分析是基于ERA-涵盖1979-2012年期间的临时冬季数据。结果有两个方面：
Recent studies have shown that midlatitude air–sea interactions are strongly modulated by synoptic variability. The present study investigates how air–sea interactions over the Gulf Stream sea surface temperature (SST) front vary in different synoptic regimes. We focus more particularly on the variation of three atmospheric mean state features which are colocated with the SST front in winter: enhanced ascent and precipitation on the warm side of the SST front, and enhanced low‐level baroclinicity at the entrance of the storm track. These three fields are partitioned depending on whether they occur in the cold sector of extratropical cyclones or in any other synoptic features. The analysis is based on ERA‐Interim winter data covering the period 1979–2012. Results are twofold: