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Reduction of Aerosol Absorption in Beijing Since 2007 from MODIS and AERONETAn analysis of the time series of MODIS-based and AERONET aerosol records over Beijing reveals two distinct periods, before and after 2007. The MODIS data from both the Terra and Aqua satellites were processed with the new Multi-Angle Implementation of Atmospheric Correction (MAIAC) algorithm. A comparison of MAIAC and AERONET AOT shows that whereas MAIAC consistently underestimated peak AOT values by 10-20% in the prior period, the bias mostly disappears after mid- 2007. Independent analysis of the AERONET dataset reveals little or no change in the effective radii of the fine and coarse fractions and of the Angstrom exponent. At the same time, it shows an increasing trend in the single scattering albedo, by ~0.02 in 9 years. As MAIAC was using the same aerosol model for the entire 2000-2010 period, the decrease in AOT bias after 2007 can be explained only by a corresponding decrease of aerosol absorption caused by a reduction in local black carbon emissions. The observed changes correlate in time with the Chinese government's broad measures to improve air quality in Beijing during preparations for the Summer Olympics of 2008.
Document ID
20120003919
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Lyapustin, A.
(Maryland Univ. Baltimore County Baltimore, MD, United States)
Smirnov, A.
(Sigma Space Corp. Lanham, MD, United States)
Holben, B.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Chin, M.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Streets, D. G.
(Argonne National Lab. IL, United States)
Lu, Z.
(Argonne National Lab. IL, United States)
Kahn, R.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Slutsker, I.
(Sigma Space Corp. Lanham, MD, United States)
Laszlo, I.
(National Oceanic and Atmospheric Administration Chanhassen, MN, United States)
Kondragunta, S.
(National Oceanic and Atmospheric Administration Chanhassen, MN, United States)
Tanre, D.
(Lille-1 Univ. Villeneuve-d'Asoq, France)
Dubovik, O.
(Lille-1 Univ. Villeneuve-d'Asoq, France)
Goloub, P.
(Lille-1 Univ. Villeneuve-d'Asoq, France)
Chen, H.-B.
(Institute of Atmospheric Physics Beijing, China)
Sinyuk, A.
(Sigma Space Corp. Lanham, MD, United States)
Wang, Y.
(Maryland Univ. Baltimore County Baltimore, MD, United States)
Korkin, S.
(Maryland Univ. Baltimore County Baltimore, MD, United States)
Date Acquired
August 25, 2013
Publication Date
May 20, 2011
Publication Information
Publication: Geophysical Research Letters
Volume: 38
Issue: L1080
ISSN: 0094-8276
Subject Category
Meteorology And Climatology
Report/Patent Number
GSFC.JA.5779.2011
Distribution Limits
Public
Copyright
Other

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