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Synoptic regimes associated with the eastern Mediterranean wet season cyclone tracks

机译：与地中海东部雨季气旋轨迹有关的天气模式

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The main synoptic patterns associated with the wet season (October May) eastern Mediterranean cyclones have been analyzed and described using NCEP/NCAR reanalysis datasets for the period 1958-2013. The cyclone tracks detected in the eastern Mediterranean are classified into two types based on their positions: the local tracks and the long tracks. The local tracks are either stationary or short tracks. The long tracks distinguished into eleven very closed and highly correlated clusters, which are presented into three regimes namely the northern, the southern and the eastern border Mediterranean regimes. Among the 940 (44.78% of a total of 2099) long tracks, the northern, southern, and eastern border regime contributes respectively about 53.62%, 41.81% and 5% of the long tracks. In addition, the distribution of the long tracks reveals that a larger proportion of the cyclones are generated at the northern coast during November and spring months, while few cyclones are developed over the eastern Mediterranean border in warm months (April and May). Further, their synoptic features show that the regimes are associated with the extension of Azores high, specifically for each regime, the cyclogenesis areas of its clusters are controlled by the intersection of low level (850 hPa) trough and the position of the upper level (250 hPa) maximum wind. Furthermore, the orientations of clusters are controlled by the extension of Siberian high and the shape of cyclonic trough at 850 hPa. In addition, the synoptic study shows that most of the southern cyclones generated externally by African and Red Sea troughs, while most of the northern and eastern border cyclones are generated internally. (C) 2016 Elsevier B.V. All rights reserved.
机译：使用1958-2013年期间的NCEP / NCAR再分析数据集，分析和描述了与东部地中海湿季（5月）相关的主要天气模式。在地中海东部地区检测到的旋风径迹根据其位置分为两种：局部径迹和长径迹。本地轨道是固定轨道或短轨道。漫长的足迹分为11个非常封闭且高度相关的集群，分为三个政权，即北部，南部和东部边界地中海政权。在940条长路中（占2099年的44.78％），北部，南部和东部边境政权分别贡献了长条路的53.62％，41.81％和5％。此外，长径的分布表明，在十一月和春季月份中，北部海岸产生了较大比例的气旋，而在温暖月份（四月和五月），地中海东部边界地区很少形成气旋。此外，它们的天气特征表明，该方案与亚速尔群岛的高位扩展有关，特别是对于每种方案，其团簇的成环区域受低位（850 hPa）谷与高位（ 250 hPa）最大风。此外，团簇的取向受西伯利亚高压的延伸和850 hPa气旋槽的形状控制。此外，天气研究表明，大多数南部气旋是由非洲和红海海槽外部产生的，而大多数北部和东部边界气旋是内部产生的。 （C）2016 Elsevier B.V.保留所有权利。

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