干旱区生态环境知识资源中心(Arid): The North African coastal low level wind jet: a high resolution view

Arid

DOI	10.1007/s00382-018-4441-7
	The North African coastal low level wind jet: a high resolution view
	Soares, Pedro M. M.1; Lima, Daniela C. A.1; Semedo, Alvaro 2; Cardoso, Rita M.1; Cabos, William 3; Sein, Dmitry 4,5
通讯作者	Soares, Pedro M. M.
来源期刊	CLIMATE DYNAMICS
ISSN	0930-7575
EISSN	1432-0894
出版年	2019
卷号	53 期号:1-2 页码:1211-1230
英文摘要	The North African coastal low-level jet (NACLLJ) lies over the cold Canary current and is synoptically linked to the Azores Anticyclone and to the continental thermal low over the Sahara Desert. Although being one of the most persistent and horizontally extended coastal wind jets, this is the first high resolution modelling effort to investigate the NACLLJ climate. The current study uses a ROM atmospheric hindcast simulation with similar to 25km resolution, for the period 1980-2014. Additionally, the underlying surface wind features are also scrutinized using the CORDEX-Africa runs. These runs allow the building of a multi-model ensemble for the coastal surface flow. The ROM and the CORDEX-Africa simulations are extensively evaluated showing a good ability to represent the surface winds. The NACLLJ shows a strong seasonal cycle, but, unlike most coastal wind jets, e.g. the California one, it is significantly present all year round, with frequencies of occurrence above 20%. In spring and autumn, the maxima frequencies are around 50%, and reach values above 60% in summer. The location of maximum frequency of occurrence migrates meridionally from season to season, being in winter and spring upwind of Cap-Vert, and in summer and autumn offshore the Western Sahara. Analogously, the lowest jet wind speeds occur in winter, when the median is below 15m/s. In summer, the jet wind speed median values are similar to 20m/s and the maxima are above 30m/s. The jet occurs at heights similar to 360m. A momentum balance is pursued disclosing that the regional flow is almost geostrophic, dominated by the pressure gradient and Coriolis force. Over the jet areas the ageostrophy is responsible for the jet acceleration.
英文关键词	Regional climate modelling Coastal low-level wind jet Africa CORDEX ROM(REMO-OASIS-MPIOM) Upwelling
类型	Article
语种	英语
国家	Portugal ; Netherlands ; Spain ; Germany ; Russia
开放获取类型	hybrid, Green Published
收录类别	SCI-E
WOS记录号	WOS:000471722400073
WOS关键词	REGIONAL CLIMATE MODEL ; PRECIPITATION ; TEMPERATURE ; VARIABILITY ; PERFORMANCE ; IMPACT ; INDEX
WOS类目	Meteorology & Atmospheric Sciences
WOS研究方向	Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/214909
作者单位	1.Univ Lisbon, Fac Ciencias, IDL, Ed C8 3-26, P-1749016 Lisbon, Portugal; 2.IHE Delft, Dept Water Sci & Engn, Delft, Netherlands; 3.Univ Alcala De Henares, Dept Phys, Madrid, Spain; 4.Alfred Wegener Inst Polar & Marine Res, Handelshafen 12, D-27568 Bremerhaven, Germany; 5.Russian Acad Sci, Shirshov Inst Oceanol, 36 Nahimovskiy Prospect, Moscow 117997, Russia
推荐引用方式 GB/T 7714	Soares, Pedro M. M.,Lima, Daniela C. A.,Semedo, Alvaro,et al. The North African coastal low level wind jet: a high resolution view[J],2019,53(1-2):1211-1230.
APA	Soares, Pedro M. M.,Lima, Daniela C. A.,Semedo, Alvaro,Cardoso, Rita M.,Cabos, William,&Sein, Dmitry.(2019).The North African coastal low level wind jet: a high resolution view.CLIMATE DYNAMICS,53(1-2),1211-1230.
MLA	Soares, Pedro M. M.,et al."The North African coastal low level wind jet: a high resolution view".CLIMATE DYNAMICS 53.1-2(2019):1211-1230.