Insights into the convective evolution of Mediterranean tropical‐like cyclones,Quarterly Journal of the Royal Meteorological Society

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Insights into the convective evolution of Mediterranean tropical‐like cyclones
Quarterly Journal of the Royal Meteorological Society ( IF 3.0 ) Pub Date : 2020-09-02 , DOI: 10.1002/qj.3896
Stavros Dafis _{1,

2} , Chantal Claud ₁ , Vassiliki Kotroni ₂ , Konstantinos Lagouvardos ₂ , Jean‐Francois Rysman ₁

Affiliation

This study aims at understanding how deep convection is organized and contributes to the intensification of nine Mediterranean tropical‐like cyclones which developed between 2005 and 2018. Through a multi‐satellite approach, a combination of infrared and microwave diagnostics provides insights into the temporal and spatial evolution of deep convection. ERA5 reanalysis complements the remote‐sensing observations and is used to compute the vertical wind shear and vortex tilt to investigate their interactions with deep convection. Results show that vertical wind shear and topography have an important impact on the organization of deep convection and the symmetry of the cyclones. Only a fraction of these cyclones experienced intense convective activity close to their centres and we show that persistent deep convection in the upshear quadrants led to intensification periods. Convective activity solely in the downshear quadrants was not linked to intensification periods, while short‐lived hurricane‐like structures develop only during symmetric convective activity, leading to cyclone intensification in some of the cases. Finally, a classification of the Mediterranean tropical‐like cyclones is proposed based on the evolution of deep convection and their intensification periods.

中文翻译：

深入了解地中海热带气旋的对流演变

这项研究旨在了解深度对流的组织方式，并促进了2005年至2018年间开发的9种地中海热带气旋的加剧。通过多卫星方法，红外和微波诊断的结合提供了对时空的洞察力对流的演变。ERA5再分析补充了遥感观测结果，并用于计算垂直风切变和涡旋倾角，以研究它们与深对流的相互作用。结果表明，垂直风切变和地形对深对流的组织和旋风的对称性有重要影响。这些旋风中只有一小部分在其中心附近经历了强烈的对流活动，并且我们证明了在上升剪切象限中持续的深对流导致了强化期。仅在下剪切象限中的对流活动与强化期无关，而短寿命的飓风状结构仅在对称对流活动中发展，在某些情况下导致旋风强化。最后，根据深对流的演变及其强化期，提出了对地中海热带气旋的分类。在某些情况下会导致旋风加剧。最后，根据深对流的演变及其强化期，提出了对地中海热带气旋的分类。在某些情况下会导致旋风加剧。最后，根据深对流的演变及其强化期，提出了对地中海热带气旋的分类。

更新日期：2020-09-02

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