干旱区生态环境知识资源中心(Arid): Large scale upper-level precursors for dust storm formation over North Africa and poleward transport to the Iberian Peninsula. Part I: An observational analysis

Arid

DOI	10.1016/j.atmosenv.2020.117688
	Large scale upper-level precursors for dust storm formation over North Africa and poleward transport to the Iberian Peninsula. Part I: An observational analysis
	Orza, J. A. G.; Dhital, S.; Fiedler, S.; Kaplan, M. L.
通讯作者	Orza, JAG
来源期刊	ATMOSPHERIC ENVIRONMENT
ISSN	1352-2310
EISSN	1873-2844
出版年	2020
卷号	237
英文摘要	The analysis of three extreme African dust outbreaks over the Iberian Peninsula (IP) shows that a double Rossby wave breaking (RWB) process in the polar jet (PJ) creates the conditions for dust storm formation over subtropical deserts in North Africa and the restructuring of upper-level air flows critical for the dust transport poleward after ablation. Two consecutive anticyclonic RWBs initiate over the IP and the adjacent Atlantic, the first commencing 10 days before dust reaches the IP and the second three to five days later. The first RWB becomes quasi-stationary over the eastern Mediterranean when the second RWB develops. In turn, the first RWB blocks downstream propagation of the second, which is amplified by energy reflection poleward from the first break causing vortex intensification and equatorward propagation over the Atlas as well as a strengthening and coupling of the subtropical jet (STJ) to circulations in the ITCZ. Zonal flows are blocked and sustained low-level northeasterlies/easterlies are induced across northwest Africa. The three events present substantial differences in the location and geometry of key upper- and low-level subsynoptic features that organize the dust storms over the Sahara following the second break. Dust lifted by either the cold outflow from convective downdrafts or by orographic gravity waves interacts with terrain-induced and larger scale circulations and is transported to the IP. The location of the cyclonic large scale signal from the second RWB to the west or over the Atlas and the blocking of zonal flows are key for the poleward dust transport.
英文关键词	Saharan dust storm Upper-level disturbance Rossby wave breaking Multi-scale adjustment Poleward dust transport
类型	Article
语种	英语
开放获取类型	Bronze, Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000558538000024
WOS关键词	ROSSBY-WAVE BREAKING ; MEDITERRANEAN BASIN ; POTENTIAL VORTICITY ; MINERAL DUST ; AEROSOL ; EUROPE ; EVENT ; CLIMATOLOGY ; OUTBREAKS ; ATLANTIC
WOS类目	Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
来源机构	Desert Research Institute
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/325555
作者单位	[Orza, J. A. G.] Univ Miguel Hernandez Elche, Dept Appl Phys, SCOLAb, Av Univ S-N, Elche 03202, Spain; [Dhital, S.] Desert Res Inst, Div Atmospher Sci, Reno, NV USA; [Fiedler, S.] Univ Cologne, Inst Geophys & Meteorol, Pohligstr 3, D-50969 Cologne, Germany; [Kaplan, M. L.] Embry Riddle Aeronaut Univ, Appl Meteorol Program, Prescott, AZ USA
推荐引用方式 GB/T 7714	Orza, J. A. G.,Dhital, S.,Fiedler, S.,et al. Large scale upper-level precursors for dust storm formation over North Africa and poleward transport to the Iberian Peninsula. Part I: An observational analysis[J]. Desert Research Institute,2020,237.
APA	Orza, J. A. G.,Dhital, S.,Fiedler, S.,&Kaplan, M. L..(2020).Large scale upper-level precursors for dust storm formation over North Africa and poleward transport to the Iberian Peninsula. Part I: An observational analysis.ATMOSPHERIC ENVIRONMENT,237.
MLA	Orza, J. A. G.,et al."Large scale upper-level precursors for dust storm formation over North Africa and poleward transport to the Iberian Peninsula. Part I: An observational analysis".ATMOSPHERIC ENVIRONMENT 237(2020).