DOI: 10.1002/jgrd.50500
论文题名: A seasonal trend of single scattering albedo in southern African biomass-burning particles: Implications for satellite products and estimates of emissions for the world's largest biomass-burning source
作者: Eck T.F. ; Holben B.N. ; Reid J.S. ; Mukelabai M.M. ; Piketh S.J. ; Torres O. ; Jethva H.T. ; Hyer E.J. ; Ward D.E. ; Dubovik O. ; Sinyuk A. ; Schafer J.S. ; Giles D.M. ; Sorokin M. ; Smirnov A. ; Slutsker I.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 12 起始页码: 6414
结束页码: 6432
语种: 英语
英文关键词: aerosol absorption
; biomass burning
; southern Africa
Scopus关键词: Algorithms
; Atmospheric aerosols
; Biomass
; Particle size
; Radiometers
; Scattering
; Solar radiation
; Aerosol absorption
; Aerosol single scattering albedo
; Aerosol size distributions
; Biomass-burning
; Moderate resolution imaging spectroradiometer
; Multiangle imaging spectroradiometer
; Ozone monitoring instruments
; southern Africa
; Refractive index
; aerosol
; albedo
; biomass burning
; black carbon
; data acquisition
; light scattering
; particle size
; refractive index
; satellite imagery
; seasonal variation
; Africa
英文摘要: As a representative site of the southern African biomass-burning region, sun-sky data from the 15 year Aerosol Robotic Network (AERONET) deployment at Mongu, Zambia, was analyzed. For the biomass-burning season months (July-November), we investigate seasonal trends in aerosol single scattering albedo (SSA), aerosol size distributions, and refractive indices from almucantar sky scan retrievals. The monthly mean single scattering albedo at 440 nm in Mongu was found to increase significantly from ~0.84 in July to ~0.93 in November (from 0.78 to 0.90 at 675 nm in these same months). There was no significant change in particle size, in either the dominant accumulation or secondary coarse modes during these months, nor any significant trend in the Ångström exponent (440-870 nm; r2 = 0.02). A significant downward seasonal trend in imaginary refractive index (r2 = 0.43) suggests a trend of decreasing black carbon content in the aerosol composition as the burning season progresses. Similarly, burning season SSA retrievals for the Etosha Pan, Namibia AERONET site also show very similar increasing single scattering albedo values and decreasing imaginary refractive index as the season progresses. Furthermore, retrievals of SSA at 388 nm from the Ozone Monitoring Instrument satellite sensor show similar seasonal trends as observed by AERONET and suggest that this seasonal shift is widespread throughout much of southern Africa. A seasonal shift in the satellite retrieval bias of aerosol optical depth from the Moderate Resolution Imaging Spectroradiometer collection 5 dark target algorithm is consistent with this seasonal SSA trend since the algorithm assumes a constant value of SSA. Multi-angle Imaging Spectroradiometer, however, appears less sensitive to the absorption-induced bias. Key Points Seasonal trend in particle absorption observed with AERONET retrievals Trend in imaginary refractive index observed but no trend in particle size OMI satellite retrievals also observed seasonal SSA trend in southern Africa © 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/63636
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: Universities Space Research Association, Columbia, MD, United States; NASA Goddard Space Flight Center, Code 618, Greenbelt, MD 20771, United States; Naval Research Laboratory, Monterey, CA, United States; Zambian Meteorological Department, Lusaka, Zambia; School of Geo- and Spatial Sciences, North-West University, Potchefstroom, South Africa; Enviropyronics, White Salmon, WA, United States; Universite de Lille, Villeneuve d'Ascq, France; Sigma Space Corporation, Lanham, MD, United States
Recommended Citation:
Eck T.F.,Holben B.N.,Reid J.S.,et al. A seasonal trend of single scattering albedo in southern African biomass-burning particles: Implications for satellite products and estimates of emissions for the world's largest biomass-burning source[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(12)