气候变化领域集成服务门户(CCPortal): Surface processes in the 7 November 2014 medicane from air-sea coupled high-resolution numerical modelling

CCPortal

DOI	10.5194/acp-20-6861-2020
	Surface processes in the 7 November 2014 medicane from air-sea coupled high-resolution numerical modelling
	Bouin M.-N.; Lebeaupin Brossier C.
发表日期	2020
ISSN	1680-7316
起始页码	6861
结束页码	6881
卷号	20 期号:11
英文摘要	A medicane, or Mediterranean cyclone with characteristics similar to tropical cyclones, is simulated using a kilometre-scale ocean-atmosphere coupled modelling platform. A first phase leads to strong convective precipitation, with high potential vorticity anomalies aloft due to an upper-level trough. Then, the deepening and tropical transition of the cyclone result from a synergy of baroclinic and diabatic processes. Heavy precipitation results from uplift of conditionally unstable air masses due to low-level convergence at sea. This convergence is enhanced by cold pools, generated either by rain evaporation or by advection of continental air masses from northern Africa. Back trajectories show that air-sea heat exchanges moisten the low-level inflow towards the cyclone centre. However, the impact of ocean-atmosphere coupling on the cyclone track, intensity and life cycle is very weak. This is due to a sea-surface cooling 1 order of magnitude weaker than for tropical cyclones, even in the area of strong enthalpy fluxes. Surface currents have no impact. Analysing the surface enthalpy fluxes shows that evaporation is controlled mainly by the sea-surface temperature and wind. Humidity and temperature at the first level play a role during the development phase only. In contrast, the sensible heat transfer depends mainly on the temperature at the first level throughout the medicane lifetime. This study shows that the tropical transition, in this case, is dependent on processes widespread in the Mediterranean Basin, like advection of continental air, rain evaporation and formation of cold pools, and dry-air intrusion. © 2020 Copernicus GmbH. All rights reserved.
语种	英语
scopus关键词	air mass; air temperature; atmosphere-ocean coupling; baroclinic motion; cyclone; diabatic process; humidity; Mediterranean environment; numerical model; potential vorticity; precipitation (climatology); sensible heat flux; Africa; Mediterranean Sea
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/141283
作者单位	CNRM, Université de Toulouse, Météo-France, CNRS, Toulouse, France; Laboratoire d'Océanographie Physique et Spatiale, Ifremer, University of Brest, CNRS, IRD, Brest, France
推荐引用方式 GB/T 7714	Bouin M.-N.,Lebeaupin Brossier C.. Surface processes in the 7 November 2014 medicane from air-sea coupled high-resolution numerical modelling[J],2020,20(11).
APA	Bouin M.-N.,&Lebeaupin Brossier C..(2020).Surface processes in the 7 November 2014 medicane from air-sea coupled high-resolution numerical modelling.Atmospheric Chemistry and Physics,20(11).
MLA	Bouin M.-N.,et al."Surface processes in the 7 November 2014 medicane from air-sea coupled high-resolution numerical modelling".Atmospheric Chemistry and Physics 20.11(2020).