DOI: 10.1002/jgrd.50470
论文题名: Meteorological and dust aerosol conditions over the western Saharan region observed at Fennec Supersite-2 during the intensive observation period in June 2011
作者: Todd M.C. ; Allen C.J.T. ; Bart M. ; Bechir M. ; Bentefouet J. ; Brooks B.J. ; Cavazos-Guerra C. ; Clovis T. ; Deyane S. ; Dieh M. ; Engelstaedter S. ; Flamant C. ; Garcia-Carreras L. ; Gandega A. ; Gascoyne M. ; Hobby M. ; Kocha C. ; Lavaysse C. ; Marsham J.H. ; Martins J.V. ; McQuaid J.B. ; Ngamini J.B. ; Parker D.J. ; Podvin T. ; Rocha-Lima A. ; Traore S. ; Wang Y. ; Washington R.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 15 起始页码: 8426
结束页码: 8447
语种: 英语
英文关键词: Atlantic Inflow
; Dust aerosol
; haboobs
; Low level jet
; Saharan Heat Low
; west African monsoon
Scopus关键词: Aerosols
; Atmospheric movements
; Climate models
; Computer simulation
; Atlantic Inflow
; Dust aerosols
; haboobs
; Heat low
; Low level jet
; West African Monsoon
; Dust
; aerosol
; boundary layer
; climatology
; dust
; forecasting method
; heat flow
; meteorology
; numerical model
; observational method
; remote sensing
; trough
; Atlantic Ocean
; Sahara
; Vulpes zerda
英文摘要: The climate of the Sahara is relatively poorly observed and understood, leading to errors in forecast model simulations. We describe observations from the Fennec Supersite-2 (SS2) at Zouerate, Mauritania during the June 2011 Fennec Intensive Observation Period. These provide an improved basis for understanding and evaluating processes, models, and remote sensing. Conditions during June 2011 show a marked distinction between: (i) a "Maritime phase" during the early part of the month when the western sector of the Sahara experienced cool northwesterly maritime flow throughout the lower troposphere with shallow daytime boundary layers, very little dust uplift/transport or cloud cover. (ii) A subsequent "heat low" phase which coincided with a marked and rapid westward shift in the Saharan heat low towards its mid-summer climatological position and advection of a deep hot, dusty air layer from the central Sahara (the "Saharan residual layer"). This transition affected the entire western-central Sahara. Dust advected over SS2 was primarily from episodic low-level jet (LLJ)-generated emission in the northeasterly flow around surface troughs. Unlike Fennec SS1, SS2 does not often experience cold pools from moist convection and associated dust emissions. The diurnal evolution at SS2 is strongly influenced by the Atlantic inflow (AI), a northwesterly flow of shallow, cool and moist air propagating overnight from coastal West Africa to reach SS2 in the early hours. The AI cools and moistens the western Saharan and weakens the nocturnal LLJ, limiting its dust-raising potential. We quantify the ventilation and moistening of the western flank of the Sahara by (i) the large-scale flow and (ii) the regular nocturnal AI and LLJ mesoscale processes. Key Points First detailed observations from western Sahara sector Intraseasonal shift in Saharan heat low drives meteorological/aerosol conditions Atlantic Inflow interaction with low level jet ©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/63431
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: University of Sussex, United Kingdom; Aeroqual Limited, Auckland, New Zealand; University of Oxford, United Kingdom; School of Earth and Environment, University of Leeds, United Kingdom; Office National de Météorologie, Mauritanie, United Kingdom; AeroEquip and Conseil, Douala, Cameroon; National Center for Atmospheric Science, University of Leeds, United Kingdom; Laboratoire Atmosphères, Milieux, Observations Spatiales, CNRS, Université Pierre et Marie Curie, Paris, France; University of Maryland Baltimore County (UMBC), United States; ASECNA, Dakar-Yoff, Senegal; LOA, University of Lille, France
Recommended Citation:
Todd M.C.,Allen C.J.T.,Bart M.,et al. Meteorological and dust aerosol conditions over the western Saharan region observed at Fennec Supersite-2 during the intensive observation period in June 2011[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(15)