DOI: 10.1016/j.atmosenv.2016.10.051
Scopus记录号: 2-s2.0-84995695231
论文题名: Role of surface wind and vegetation cover in multi-decadal variations of dust emission in the Sahara and Sahel
作者: Kim D ; , Chin M ; , Remer L ; A ; , Diehl T ; , Bian H ; , Yu H ; , Brown M ; E ; , Stockwell W ; R
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 148 起始页码: 282
结束页码: 296
语种: 英语
英文关键词: Dust emission
; GOCART model
; NDVI
; North Africa
; Sahel
; Surface wind
Scopus关键词: Arid regions
; Vegetation
; Dust emission
; NDVI
; North Africa
; Sahel
; Surface winds
; Dust
; rain
; arid region
; atmospheric pollution
; decadal variation
; dust
; emission
; NDVI
; pollutant transport
; satellite imagery
; semiarid region
; surface wind
; vegetation cover
; Article
; controlled study
; dust
; latitude
; longitude
; priority journal
; Sahel
; seasonal variation
; summer
; surface property
; vegetation
; Western Sahara
; wet deposition
; wind
; winter
; North Africa
; Sahara
; Sahel [Sub-Saharan Africa]
; South America
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: North Africa, the world's largest dust source, is non-uniform, consisting of a permanently arid region (Sahara), a semi-arid region (Sahel), and a relatively moist vegetated region (Savanna), each with very different rainfall patterns and surface conditions. This study aims to better understand the controlling factors that determine the variation of dust emission in North Africa over a 27-year period from 1982 to 2008, using observational data and model simulations. The results show that the model-derived Saharan dust emission is only correlated with the 10-m winds (W10m) obtained from reanalysis data, but the model-derived Sahel dust emission is correlated with both W10m and the Normalized Difference Vegetation Index (NDVI) that is obtained from satellite. While the Saharan dust accounts for 82% of the continental North Africa dust emission (1340–1570 Tg year−1) in the 27-year average, the Sahel accounts for 17% with a larger seasonal and inter-annual variation (230–380 Tg year−1), contributing about a quarter of the transatlantic dust transported to the northern part of South America. The decreasing dust emission trend over the 27-year period is highly correlated with W10m over the Sahara (R = 0.92). Over the Sahel, the dust emission is correlated with W10m (R = 0.69) but is also anti-correlated with the trend of NDVI (R = -0.65). W10m is decreasing over both the Sahara and the Sahel between 1982 and 2008, and the trends are correlated (R = 0.53), suggesting that Saharan/Sahelian surface winds are a coupled system, driving the inter-annual variation of dust emission. © 2016 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/82803
Appears in Collections: 气候变化事实与影响
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作者单位: Universities Space Research Association, Columbia, MD, United States; NASA Goddard Space Flight Center, Greenbelt, MD, United States; JCET/UMBC, Baltimore County, Baltimore, MD, United States; University of Maryland College Park, College Park, MD, United States; Howard University, Washington D.C., United States; European Commission, Joint Research Center, Ispra, Italy
Recommended Citation:
Kim D,, Chin M,, Remer L,et al. Role of surface wind and vegetation cover in multi-decadal variations of dust emission in the Sahara and Sahel[J]. Atmospheric Environment,2017-01-01,148