气候变化领域集成服务门户(CCPortal): On the Link Between the Madden-Julian Oscillation, Euro-Mediterranean Weather Regimes, and Morocco Winter Rainfall

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DOI	10.1029/2020JD032387
	On the Link Between the Madden-Julian Oscillation, Euro-Mediterranean Weather Regimes, and Morocco Winter Rainfall
	Gadouali F.; Semane N.; Muñoz Á.G.; Messouli M.
发表日期	2020
ISSN	2169897X
卷号	125 期号:8
英文摘要	K-means cluster analysis of wintertime 500-hPa geopotential height anomalies allowed identifying seven weather regimes (WRs) describing the atmospheric variability over the Euro-Mediterranean domain. The study of transitions between those WRs provided consistent results with the westward displacement of the blocking nearby northern Europe before the onset of the negative phase of the North Atlantic Oscillation (NAO−). The onset of the latter is, indeed, preceded by the North Atlantic blocking regime (NABl). In addition, we detected a preferred transition from the Scandinavian Blocking (ScBl) to NAO+ through the European Ridge regime (EuRG), which is modulated by active phases of the Madden-Julian Oscillation (MJO). The examination of the relationship between WRs and precipitation over Morocco showed that the NAO− (NAO+) regime is accompanied by more (less) rainy episodes. The investigation of the lagged relationships between the MJO and the WRs depicted the role of an active MJO in Phase 2 as a precursor of the ScBl and of an active MJO in Phase 6 as a precursor of the NABl. The exploration of the 10–15 days lagged impact of the MJO on Moroccan rainfall showed an increase (decrease) of wet (dry) conditions 10 to 15 days after the occurrence of an active MJO in Phases 6 and 8 (Phases 2-3-4). The MJO modulation of the WRs and rainfall patterns over Morocco constitutes an important source of predictability at the medium- and the extended-range (subseasonal) time scales, with potential use by decision makers in key socioeconomic sectors in the region. ©2020. The Authors.
英文关键词	MJO; NAO+; NAO-; precipitation in Morocco; sub-seasonal forecast; weather regimes
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186046
作者单位	Direction de la Météorologie Nationale, Casablanca, Morocco; Ecole Hassania des Travaux Publics, Casablanca, Morocco; International Research Institute for Climate and Society (IRI), The Earth Institute at Columbia University, Palisades, NY, United States; Faculté des sciences Semlalia, Université Cadi Ayyad, Marrakesh, Morocco
推荐引用方式 GB/T 7714	Gadouali F.,Semane N.,Muñoz Á.G.,et al. On the Link Between the Madden-Julian Oscillation, Euro-Mediterranean Weather Regimes, and Morocco Winter Rainfall[J],2020,125(8).
APA	Gadouali F.,Semane N.,Muñoz Á.G.,&Messouli M..(2020).On the Link Between the Madden-Julian Oscillation, Euro-Mediterranean Weather Regimes, and Morocco Winter Rainfall.Journal of Geophysical Research: Atmospheres,125(8).
MLA	Gadouali F.,et al."On the Link Between the Madden-Julian Oscillation, Euro-Mediterranean Weather Regimes, and Morocco Winter Rainfall".Journal of Geophysical Research: Atmospheres 125.8(2020).