Seasonal Variation of Columnar Aerosol Optical Properties in Yangtze River Delta in China

YU Xingna; ZHU Bin; YIN Yan; FAN Shuxian; CHEN Aijun

doi:10.1007/s00376-011-0158-9

Volume 28 Issue 6

Nov. 2011

Article Contents

Article > ADVANCES IN ATMOSPHERIC SCIENCES > 2011 > 28(6): 1326-1335

Seasonal Variation of Columnar Aerosol Optical Properties in Yangtze River Delta in China

1.
Key Laboratory of Meteorological Disaster of Ministry of Education, Department of Atmospheric Physics, Nanjing University of Information Science and Technology, Nanjing 210044,Key Laboratory of Meteorological Disaster of Ministry of Education, Department of Atmospheric Physics, Nanjing University of Information Science and Technology, Nanjing 210044,CMA Key Laboratory for Atmospheric Physics and Environment, Nanjing University of Information Science and Technology, Nanjing 210044,Key Laboratory of Meteorological Disaster of Ministry of Education, Department of Atmospheric Physics, Nanjing University of Information Science and Technology, Nanjing 210044,Key Laboratory of Meteorological Disaster of Ministry of Education, Department of Atmospheric Physics, Nanjing University of Information Science and Technology, Nanjing 210044

doi: 10.1007/s00376-011-0158-9

Abstract
References
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Abstract:
In order to understand the seasonal variation of aerosol optical properties in the Yangtze River Delta, 5 years of measurements were conducted during September 2005 to December 2009 at Taihu, China. The monthly averages of aerosol optical depth were commonly >0.6; the maximum seasonal average (0.93) occurred in summer. The magnitude of the Angstrom exponent was found to be high throughout the year; the highest values occurred in autumn (1.33) and were the lowest in spring (1.08). The fine modes of volume size distribution showed the maxima (peaks) at a radius of ～0.15 μm in spring, autumn, and winter; at a radius of ～0.22 μm in summer. The coarse modes showed the maxima (peaks) at a radius of 2.9 μm in spring, summer, and autumn and at a radius of 3.8 μm in winter. The averages of single-scattering albedo were 0.92 (spring), 0.92 (summer), 0.91 (autumn), and 0.88 (winter). The averages of asymmetry factor were found to be larger in summer than during other seasons; they were taken as 0.66 at 440--1020 nm over Taihu. The real part of the refractive index showed a weak seasonal variation, with averages of 1.48 (spring), 1.43 (summer), 1.45 (autumn), and 1.48 (winter). The imaginary parts of the refractive index were higher in winter (0.013) than in spring (0.0076), summer (0.0092), and autumn (0.0091), indicating that the atmosphere in the winter had higher absorbtivity.
- aerosol optical properties,
- Yangtze River Delta,
- AERONET
References

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