DOI: 10.1002/jgrd.50534
论文题名: Dust emission and transport mechanisms in the central Sahara: Fennec ground-based observations from Bordj Badji Mokhtar, June 2011
作者: Allen C.J.T. ; Washington R. ; Engelstaedter S.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 12 起始页码: 6212
结束页码: 6232
语种: 英语
英文关键词: Cold pool
; Convective plume
; Dust
; Fennec
; Low level jet
; Sahara
Scopus关键词: Lakes
; Wind effects
; Cold pool
; Convective plume
; Fennec
; Low level jet
; Sahara
; Dust
; advection
; atmospheric plume
; atmospheric transport
; dust
; ground-based measurement
; jet stream
; long range transport
; outflow
; wind velocity
; Adrar [Algeria]
; Algeria
; Bordj Badji Mokhtar
; Sahara
; Vulpes zerda
英文摘要: A detailed analysis of the first ever high-resolution ground-based dust observations in the remote central Sahara is presented from observations at Bordj Badji Mokhtar (BBM), taken during the Fennec project in June 2011. Detailed case studies are presented for three dust-producing mechanisms (cold pool outflows, low-level jets (LLJs), and dry convective plumes). The results confirm the importance of cold pools in dust emission and transport in the region. Forty-five percent of the dust over BBM is generated by local emission in cold pool outflows. Twenty-seven percent of the dust is advected rather than locally emitted dust; on three occasions, it is advected over 500 km to BBM by cold pool outflows. Dust that has been in long-range transport to the area within such cold pool outflows is found to carry larger particles and be responsible for higher dust loadings than fresh uplift. LLJs are of tertiary importance in the partitioning, responsible for 14% dust over BBM. Dry convective plumes are identifiable in the data but produce much less significant quantities of dust, approximately 2% of the June total. The cube of wind speed has a stronger correlation with dust emission than wind speed. The correlation is strongest (at 95% confidence) for LLJ-induced emission (0.88), followed by locally emitting cold pools (0.78). Key Points Dust production in the central Sahara described from new ground observations Dust burden partitioned by emission mechanism; cold pool contribution dominates Cube of wind speed strongly correlated with dust emission © 2013. American Geophysical Union. All Rights Reserved. 资助项目: NE/G017166/1
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63593
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Climate Research Laboratory, Centre for the Environment, University of Oxford, South Parks Road, Oxford, OX1 3QY, United Kingdom
Recommended Citation:
Allen C.J.T.,Washington R.,Engelstaedter S.. Dust emission and transport mechanisms in the central Sahara: Fennec ground-based observations from Bordj Badji Mokhtar, June 2011[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(12)