DOI: 10.1002/grl.50143
论文题名: The importance of the diurnal cycle of Aerosol Optical Depth in West Africa
作者: Kocha C. ; Tulet P. ; Lafore J.-P. ; Flamant C.
刊名: Geophysical Research Letters
ISSN: 0094-9304
EISSN: 1944-9035
出版年: 2013
卷: 40, 期: 4 起始页码: 785
结束页码: 790
语种: 英语
英文关键词: Aerosol Optical Depth
; convective scale modeling
; Diurnal cycle
; Remote sensing
Scopus关键词: Atmospheric aerosols
; Climatology
; Remote sensing
; Supercomputers
; Aerosol optical depths
; Aerosol optical thickness
; Atmospheric simulations
; Diurnal cycle
; High-resolution models
; Moist convection
; Satellite retrieval
; Scale modeling
; Dust
; aerosol
; atmospheric convection
; diurnal variation
; dust
; estimation method
; jet
; numerical model
; optical depth
; sampling
; satellite imagery
; simulation
; West Africa
英文摘要: High resolution atmospheric simulations with the AROME model coupled with a dust module over West Africa for the whole of June 2006 were used to calculate aerosol optical thickness (AOT). Simulations showed a significant diurnal cycle of 0.2 in the dust AOT that could not be inferred from the MODIS Deep Blue retrievals due to their timings. Dust sources are mainly driven by the breakdown of the early morning low-level jet and by moist convection in the afternoon, leading to opposite diurnal cycles. Also, simulations show that cloud cover significantly prevents the observation of AOT. The under-sampling of the diurnal cycle by satellites plus the impact of cloud masks on the space-borne AOT retrievals induce an underestimation of 0.28 (~40%) over the convective regions and an overestimation of 0.1 (17%) over morning source areas like Bodélé. A combination of observations and high-resolution models could constrain bias and give a more realistic AOT climatology. Key Points Low-level jet and cold pool lead to opposite process-related AOT diurnal cycles Cloud masking and temporal undersampling induce bias in satellite retrievals Combination of observations and CRM could constrain AOT bias ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84878189477&doi=10.1002%2fgrl.50143&partnerID=40&md5=2bb7e4fa5ab5e6b571954071486c7b52
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6568
Appears in Collections: 气候减缓与适应
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作者单位: CNRM-GAME, Météo-France and CNRS, Toulouse, France
Recommended Citation:
Kocha C.,Tulet P.,Lafore J.-P.,et al. The importance of the diurnal cycle of Aerosol Optical Depth in West Africa[J]. Geophysical Research Letters,2013-01-01,40(4).