Analysis on Autumn Aerosol Optical Characteristics at Lanzhou with Sun-photometer

Hui LIU; Ye YU; Dunsheng XIA; Suping ZHAO

doi:10.7522/j.issn.1000-0534.2019.00057

Plateau Meteorology >

2020 , Vol. 39 >Issue 1: 204 - 212

DOI: https://doi.org/10.7522/j.issn.1000-0534.2019.00057

Analysis on Autumn Aerosol Optical Characteristics at Lanzhou with Sun-photometer

Hui LIU ,
Ye YU ,
Dunsheng XIA ,
Suping ZHAO

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1. Key Laboratory of Land Surface Process & Climate Change in Clod & Arid Regions, the Northwest Institute of Eco?Environment and Resources (NIEER), Chinese Academy of Sciences (CAS), Lanzhou 730000, Gansu, China;2. Key Laboratory of Western China’s Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, Gansu, China

Received date: 2019-03-29

Online published: 2020-02-28

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Abstract

Aerosol optical properties including aerosol optical depth (AOD), Angstrom wavelength index (α), and atmospheric turbidity coefficient (β) were inferred from the ground?based solar photometer observation data in Lanzhou from September to November 2015.The distribution and variation of aerosol optical properties were analyzed.Types and distribution of aerosols were derived based on Angstrom range and graphical method.The results show that the average AOD_{500 nm} in autumn in Lanzhou City is 0.47±0.22.α _{440~870 nm} was the lowest in October (0.95±0.26) and the highest in September (1.21±0.14).β is the lowest in September (0.15±0.05) and the highest in November (0.28±0.12).The daily variation of AOD_500nm ranges from 0.27 to 0.52.During September and October 2015, AOD_{500 nm} mainly distributed between 0.2~0.6.In November, AOD_{500 nm} is concentrated between 0.4~0.8, indicating that the distribution of AOD_{500 nm} in Lanzhou in autumn is concentrated, and loading of aerosols increased from September to November.The wavelength index is mainly distributed between 1.0~1.4, 0.6~0.8, and 1.0~1.4 in September, October and November, respectively, with peaks between 1.2~1.4 and 1.0~1.2.Overall, aerosol in autumn is dominated by fine particle aerosols in Lanzhou.AOD_500nm is significantly correlated with β, and both aerosol optical depth and turbidity coefficient can characterize the degree of turbidity.The main types of aerosols in autumn are anthropogenic and mixed aerosols in fine particle mode.The hygroscopic growth of fine particle aerosol is the main reason for the high aerosol optical depth in autumn for Lanzhou City.

Key words： Sun photometer; aerosol optical prop; aerosol optical dept; Lanzhou city

Cite this article

Hui LIU , Ye YU , Dunsheng XIA , Suping ZHAO . Analysis on Autumn Aerosol Optical Characteristics at Lanzhou with Sun-photometer[J]. Plateau Meteorology, 2020 , 39(1) : 204 -212 . DOI: 10.7522/j.issn.1000-0534.2019.00057

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