Atmospheric extinction properties in Shenyang, China

作者：Liu, Ningwei; Ma, Yanjun^*; Ma, Jianzhong; Wang, Yangfeng; Yang, Suying; Li, Liguang

来源：Particuology, 2015, 18: 120-126.

DOI：10.1016/j.partic.2014.03.007

• Atmospheric visibility
• Extinction properties
• Extinction contributions
• Particle scattering

Atmospheric visibility impairment due to human activities is becoming increasingly significant in metropolitan Shenyang, China. In this study, hourly data of relevant factors throughout the year 2010 in Shenyang were used to evaluate the local atmospheric extinction properties. The results show that the average coefficient of total extinction and aerosol single-scattering albedo in 2010 were 622.72 Mm(-1) and 0.87, respectively, values that are characteristic of the "municipal pollution type". Visibility is most impaired during winter and especially in January. The coefficient of total extinction exhibits a single daily cycle with a maximum at 5-6 am and a minimum at 3 pm. The mean extinction contributions of the constituents, from high to low, were particle scattering (87.49%), particle absorption, gas absorption, and gas scattering. The extinction contribution of gas molecules was little more than 4.5%, far smaller than that of particles. Scattering by particles was the main contributor to extinction, especially in the morning and around midnight.

• 出版日期2015-2
• 单位中国气象科学研究院; 南京信息工程大学; 中国气象局沈阳大气环境研究所