气候变化领域集成服务门户(CCPortal): Multi-model convection-resolving simulations of the October 2018 Vaia storm over Northeastern Italy

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DOI	10.1016/j.atmosres.2021.105455
	Multi-model convection-resolving simulations of the October 2018 Vaia storm over Northeastern Italy
	Giovannini L.; Davolio S.; Zaramella M.; Zardi D.; Borga M.
发表日期	2021
ISSN	0169-8095
卷号	253
英文摘要	The aim of this study is to identify the main mesoscale features and mechanisms responsible for the generation of a very intense precipitation and wind storm event, named “Vaia”, that affected the eastern Italian Alps on 27–29 October 2018. The event was characterized by extreme accumulated precipitation (up to 850 mm in three days) and exceptionally strong winds, causing severe and widespread impacts, such as floods, landslides, and extensive damages to forests and growing stock. The synoptic situation was characterized by a trough, which deepened over the eastern Atlantic, extending to France and Spain, driving a strong moist flow towards the Alpine region. At the surface, a wide cyclonic area developed over the western Mediterranean, east of the trough axis, and moved, deepening, towards northwestern Italy. The storm is investigated using a comprehensive dataset composed of both observations and numerical simulations by means of two models, namely WRF and MOLOCH, at convection-permitting resolution. The analysis highlights that the storm was characterized by two consecutive phases with strong precipitations, both fed by an intense moist southerly flow. In particular, the second phase was also marked by strong wind gusts in the Alpine area, exceeding 50 m s−1 at some weather stations. It is found that these extreme wind gusts were connected to the presence of an intense southerly low-level jet immediately ahead of a cold front, displaying an average wind speed of 35 m s−1 at 1500 m MSL. The comparison between observations and numerical results shows that the main characteristics of the storm are well simulated by both models, confirming the high predictability of this kind of events, typically associated with well-defined large-scale forcing. Also local scale features are reasonably captured by the simulations, despite the high complexity of the Alpine orography. However, WRF significantly underestimates total precipitation amounts over the most affected areas, while wind speed is overestimated by both models in the inner Alpine sectors. © 2021 Elsevier B.V.
英文关键词	Complex orography; Heavy precipitation; MOLOCH; Vaia; Wind storm; WRF
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/236864
作者单位	Department of Civil, Environmental and Mechanical Engineering, University of Trento, Trento, Italy; Institute of Atmospheric Sciences and Climate, National Research Council of Italy, CNR-ISAC, Bologna, Italy; Department of Land, Environment, Agriculture and Forestry, University of Padova, Padova, Italy; C3A - Center Agriculture Food Environment, University of Trento, Via Edmund Mach 1, San Michele all'Adige, 38010, Italy
推荐引用方式 GB/T 7714	Giovannini L.,Davolio S.,Zaramella M.,et al. Multi-model convection-resolving simulations of the October 2018 Vaia storm over Northeastern Italy[J],2021,253.
APA	Giovannini L.,Davolio S.,Zaramella M.,Zardi D.,&Borga M..(2021).Multi-model convection-resolving simulations of the October 2018 Vaia storm over Northeastern Italy.Atmospheric Research,253.
MLA	Giovannini L.,et al."Multi-model convection-resolving simulations of the October 2018 Vaia storm over Northeastern Italy".Atmospheric Research 253(2021).