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Oscillations in deep-open-cells during winter Mediterranean cyclones
npj Climate and Atmospheric Science ( IF 9 ) Pub Date : 2021-03-02 , DOI: 10.1038/s41612-021-00168-9
Huan Liu , Ilan Koren , Orit Altaratz , Reuven H. Heiblum , Pavel Khain , Xiaoran Ouyang , Jianping Guo

Open cloud cells can be described in ideal form as connected clouds that surround spots of isolated clear skies in their centers. This cloud pattern is typically associated with marine stratocumulus (MSc) that form in the oceanic boundary layer. However, it can form in deeper convective clouds as well. Here, we focus on deep-open-cells (with tops reaching up to ~5–7 km) that form in the post-frontal regions of winter Mediterranean cyclones, and examine their properties and evolution. Using a Lagrangian analysis of satellite data, we show that deep-open-cells have a larger equivalent diameter (~58 ± 18 km) and oscillate with a longer periodicity (~3.5 ± 1 h) compared to shallow MSc. A numerical simulation of one Cyprus low event reveals that precipitation-generated convergence and divergence dynamic patterns are the main driver of the open cells’ organization and oscillations. Thus, our findings generalize the mechanism attributed to the behavior of shallow marine cells to deeper convective systems.



中文翻译:

地中海冬季旋风中深层气孔的振荡

可以将开放云单元以理想的形式描述为连接的云,这些云围绕其中心孤立的晴朗天空点。这种云模式通常与在海洋边界层形成的海洋平流层积云(MSc)相关。但是,它也可以在更深的对流云中形成。在这里,我们重点研究在冬季地中海气旋的后额叶区域形成的深层开孔(顶部可达约5-7公里),并研究它们的性质和演化。通过对卫星数据进行拉格朗日分析,我们发现,与浅层MSc相比,深层开孔的等效直径更大(〜58±18 km),并且振荡周期更长(〜3.5±1 h)。塞浦路斯低事件的数值模拟表明,降水产生的收敛和发散动态模式是开放单元组织和振荡的主要驱动力。因此,我们的发现将归因于浅海细胞行为的机制推广到了较深的对流系统。

更新日期:2021-03-02
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