Seasonal Variation and Statistic Characteristics of Aerosols Optical Properties near Dust Region

JOURNAL OF DESERT RESEARCH

2009, Vol. 29

Issue (1): 174-182 DOI:

天气与气候

Seasonal Variation and Statistic Characteristics of Aerosols Optical Properties near Dust Region

LIU Jian-jun1,2， ZHENG You-fei1,2， WU Rong-jun2

1.Jiangsu Key Laboratory of Meteorological Disaster, Nanjing 210044, China; 2.College of Environmental Science and Engineering， Nanjing University of Information Science & Technology, Nanjing 210044, China

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Abstract

A ground-based sky radiometer was used to measure the direct and diffuse solar irradiances from Jan. 1999 to Mar. 2001 in Dunhuang area, one near dust region in China. The aerosol optical depth (AOD), volume size distributions, the real part of refraction index were simultaneously retrieved using the ‘SKYRAD model and their seasonal variation and statistic characteristics were analyzed. The results revealed that the aerosol optical depths varied seasonally, which increased from December, reaching its maximum value in May or April, and decreased from May to August, then also increased from September to October and with a November minimum. And the variation in Angstrom exponent (alpha) was opposite to that in AOD. The probability distributions of AOD and alpha were consistent with their seasonal variation and approximately follow a log-normal probability distribution and a normal probability distribution, respectively. The relationship between alpha and AOD showed a similar relationship in four seasons and could be characterized by one simple exponential function. The aerosol volume size distributions could be characterized by the sum of two log-normals distributions, and represented an accumulation mode with a radius of about 0.25 μm, and a coarse mode with a radius of about 7.7 μm, and there was a pseudo-mode with a radius of about 1.69 μm between the accumulation mode and coarse mode in spring. The real parts of the refraction index rose dramatically in spring, and exhibited a low sensitivity to wavelengths, meanwhile, the biggest values of probability distribution in four seasons were range between 1.54~1.56. The probability distributions of the real parts of the refraction index were fitted with Gauss Model under two conditions. The results showed that the probability distributions of the real parts of the refraction index could be better described by Gauss model, but the characteristic of which in spring was contrary with those in other seasons under two conditions.

Key words: sky radiometer aerosol optical properties near dust region seasonal variation statistic characteristics

Received: 21 August 2007 Published: 20 January 2009

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	Articles by authors
	LIU Jian-jun
	ZHENG You-fei
	WU Rong-jun

Cite this article:

LIU Jian-jun;ZHENG You-fei;WU Rong-jun. Seasonal Variation and Statistic Characteristics of Aerosols Optical Properties near Dust Region. JOURNAL OF DESERT RESEARCH, 2009, 29(1): 174-182.

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http://www.desert.ac.cn/EN/ OR http://www.desert.ac.cn/EN/Y2009/V29/I1/174

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