Abstract

Statistical characteristics of polar mesocyclones (PMCs) generated over the Russian northern seas, east of Novaya Zemlya (the Kara, Laptev, and East Siberian seas) were obtained from the Arctic System Reanalysis (ASR) data. The Okubo–Weiss criterion supplemented by a limitation on the horizontal size of the cyclone was used to identify mesoscale cyclones. It is shown that the annual variations in the number of mesocyclones are characterized by a summer maximum, and the monthly mean intensity of mesocyclones is the highest in autumn. The prevailing directions of movement of polar mesocyclones over each of the three seas are considered. It is demonstrated that during PMCs generation atmospheric fields are characterized by the synoptic near-surface depression, which leads to the transport of relatively warm air from the land to the sea and determines the development of polar mesocyclones over the sea. At the same time, heat fluxes from the sea surface in the mesocyclones are on average small.

中文翻译：

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基于北极系统再分析的欧亚北极东部极地中尺度气旋气候学

摘要

从北极系统再分析 (ASR) 数据中获得了在俄罗斯北部海域、新地岛以东（卡拉、拉普捷夫和东西伯利亚海）产生的极地中气旋 (PMC) 的统计特征。Okubo-Weiss 标准加上对旋风器水平尺寸的限制被用来识别中尺度旋风器。结果表明，中气旋数量的年变化以夏季最大为特征，秋季中气旋月平均强度最高。考虑了三个海域中极地中气旋的主要运动方向。研究表明，在 PMC 生成过程中，大气场的特征是天气近地表低气压，这导致相对温暖的空气从陆地输送到海洋，并决定了海上极地中气旋的发展。同时，中气旋中来自海面的热通量平均较小。