DOI: 10.1002/jgrd.50554
论文题名: A new high-resolution central and western Saharan summertime dust source map from automated satellite dust plume tracking
作者: Ashpole I. ; Washington R.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 13 起始页码: 6981
结束页码: 6995
语种: 英语
英文关键词: Dust source
; Dust source activation
; Mineral dust
; Remote sensing of mineral dust
; Sahara
; SEVIRI
Scopus关键词: Automation
; Natural convection
; Storms
; Dust sources
; Mineral dust
; Mountainous regions
; Sahara
; SEVIRI
; Spinning Enhanced Visible and Infrared Imager
; Tracking algorithm
; Transport direction
; Dust
; atmospheric plume
; atmospheric pollution
; dust
; mapping method
; pollutant source
; remote sensing
; resolution
; satellite imagery
; SEVIRI
; spatial resolution
; Algeria
; Mali
; Sahara
英文摘要: In this paper, we outline a new objective dust source detection method for the central and western Sahara (CWS), based on the automated tracking of individual dust plumes in data from the Spinning Enhanced Visible and Infrared Imager, available every 15 mins. at ~0.03°spatial resolution. The method is used to map the origin of summertime dust storms in the CWS for June - August 2004 - 2010. It reveals the sources of these events in unprecedented detail, allowing for the identification of specific, highly active source areas. The study of collocated surface features reveals that many of the dominant sources are likely associated with paleolakes and outwash plains, many in close proximity to the Saharan mountains. Extensive nonsource areas are associated with low albedo and elevated terrain, pointing to the mountainous regions of the Sahara. Additionally, sand seas are not identified as important source areas, but their margins sometimes are. The automated tracking method also facilitates analysis of the transport direction of dust plumes from key source regions and the inference of emission mechanisms. It is found that there are two broad domains within the CWS: one in southwest Algeria and northwest Mali, characterized primarily by transport toward the southwest and very likely dominated by low-level jets embedded in the northeasterly Harmattan winds; and a second in southern Algeria, northwest Niger, and northeast Mali where there is no preferred transport direction and a strong potential association between dust events and deep convection, pointing toward cold pool outflows as the likely deflation mechanism. Key Points Develop an automated dust tracking algorithm Reveals dust sources of central Sahara in unprecedented detail direction of dust transport and association with deep convection computed ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63585
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, Oxford University Centre for the Environment, South Parks Road, Oxford OX1 3QY, United Kingdom
Recommended Citation:
Ashpole I.,Washington R.. A new high-resolution central and western Saharan summertime dust source map from automated satellite dust plume tracking[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(13)