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Aerosol radiative forcing under clear, hazy, foggy, and dusty weather conditions over Beijing, China
Key Laboratory of Atmospheric Chemistry, Centre for Atmosphere Watch and Services, Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing, China
Key Laboratory of Atmospheric Chemistry, Centre for Atmosphere Watch and Services, Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing, China
Key Laboratory of Atmospheric Chemistry, Centre for Atmosphere Watch and Services, Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing, China
China Meteorological Administration Training Center, Beijing, China
State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
Laboratory for Middle Atmosphere and Global Environment Observation, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
Laboratoire d'Optique Amosphérique, Université des Sciences et Technologies de Lille, Villeneuve d'Ascq, France
EastFIRE Lab, College of Science, George Mason University, Fairfax, Virginia, USA
Direct aerosol radiative forcing (ARF) under four classic weather conditions, i.e., clear, hazy, foggy, and dusty days, over Beijing was investigated using the Santa Barbara Discrete Ordinate Radiative Transfere (SBDART) model, ground-based sunphotometer measurements, pyranometer measurements, and a back-trajectory analysis. The ratios of aerosol optical depths (AOD) under hazy, foggy, and dusty weather conditions to the AOD under clear weather condition were much greater than the ratios of surface aerosol concentrations under these conditions. The single scattering albedo and the ratio of ARF at the surface level to ARF at the top of the atmosphere suggested that more absorbing particles existed under hazy and foggy conditions than those under dusty conditions. ARF measured at both the surface level and the top of the atmosphere for dusty days was higher than that for foggy, hazy, and clear days. Therefore, significantly difference exists in ARF over Beijing due to changes in aerosol sources and weather conditions. The altitude of the aerosol transport layer for dusty days was higher than that for foggy days.
Received 6 January 2009; accepted 19 February 2009; published 24 March 2009.
Citation: (2009), Aerosol radiative forcing under clear, hazy, foggy, and dusty weather conditions over Beijing, China, Geophys. Res. Lett., 36, L06804, doi:10.1029/2009GL037181.
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