气候变化领域集成服务门户(CCPortal): Assessing the climate change impact on the North African offshore surface wind and coastal low-level jet using coupled and uncoupled regional climate simulations

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DOI	10.1007/s00382-018-4565-9
	Assessing the climate change impact on the North African offshore surface wind and coastal low-level jet using coupled and uncoupled regional climate simulations
	Soares P.M.M.; Lima D.C.A.; Semedo A.; Cardoso R.M.; Cabos W.; Sein D.V.
发表日期	2019
ISSN	0930-7575
起始页码	7111
结束页码	7132
卷号	52 期号:11
英文摘要	The North African Coastal Low-Level Jet (NACLLJ) is a semi-permanent feature offshore the north western African coast, linked to the cold nearshore upwelling of the Canary Eastern Boundary Current system. Its main synoptic drivers are the Azores Anticyclone over the ocean and the inland Sahara thermal low. The coastal jet events occur in one of the world’s most productive fisheries region, thus the evaluation of the effects of global warming in its properties is imperative. This study proposes an analysis of the annual and intra-annual attributes of the NACLLJ for two time periods 1976–2005 (historical) and 2070–2199 (future), resorting to coupled and uncoupled atmosphere–ocean simulations with the ROM model, as well as near surface offshore wind speed from the CORDEX-Africa ensemble. The future simulations follow the RCP8.5 greenhouse gas emissions scenario. Overall, the ROM coupled simulation presents the best performance in reproducing the present-climate near surface wind speed, offshore northwest Africa, compared to the remaining RCM simulations. The higher SST resolution in the coupled simulations favours much localised colder upwelling strips near the coast and consequently stronger jets. In future climate, a small increase in the surface wind speed is projected, mainly linked to the regions of coastal jet presence. The NACLLJ is projected to be more frequent and intense, encompassing larger areas. An increase of the jet seasonal frequencies of occurrence is projected for all seasons, which is larger from spring to autumn (up to 15, 16 and 22% more frequent, respectively). However, in some offshore areas the winter NACLLJ persistency is likely to double, relatively to present-climate. Higher inter-annual variability is also projected for the future NACLLJ seasonal frequencies. The strengthening of the coastal jet speeds is also significant, between 5 and 12% in all seasons. Additionally, the jet’s diurnal cycle shows an increase in jet occurrence across the day, particularly in the mid and late afternoon. © 2018, The Author(s).
英文关键词	Africa; Coastal low-level wind jet; CORDEX; Global warming; Regional climate modelling; REMO–OASIS–MPIOM
语种	英语
scopus关键词	air-sea interaction; climate change; climate effect; climate modeling; computer simulation; environmental assessment; global warming; jet flow; regional climate; sea surface temperature; surface wind; Africa
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/146233
作者单位	Instituto Dom Luiz (IDL), Faculdade de Ciências da Universidade de Lisboa, Campo Grande, Ed. C8 (3.26), Lisbon, 1749-016, Portugal; Department of Water Science and Engineering, IHE-Delft, P.O. Box 3015, Delft, 2601 DA, Netherlands; Department of Physics and Mathematics, University of Alcalá, Alcalá de Henares, Madrid, Spain; Alfred Wegener Institute for Polar and Marine Research, Am Handelshafen 12, Bremerhaven, 27568, Germany; Shirshov Institute of Oceanology, Russian Academy of Science, 36 Nahimovskiy prospect, Moscow, 117997, Russian Federation
推荐引用方式 GB/T 7714	Soares P.M.M.,Lima D.C.A.,Semedo A.,et al. Assessing the climate change impact on the North African offshore surface wind and coastal low-level jet using coupled and uncoupled regional climate simulations[J],2019,52(11).
APA	Soares P.M.M.,Lima D.C.A.,Semedo A.,Cardoso R.M.,Cabos W.,&Sein D.V..(2019).Assessing the climate change impact on the North African offshore surface wind and coastal low-level jet using coupled and uncoupled regional climate simulations.Climate Dynamics,52(11).
MLA	Soares P.M.M.,et al."Assessing the climate change impact on the North African offshore surface wind and coastal low-level jet using coupled and uncoupled regional climate simulations".Climate Dynamics 52.11(2019).