(주)에이피엠엔지니어링

2018~2021년 안면도에서 관측된 황사(Asian dust)와 연무(Haze)에 따른 에어로졸 물리, 광학 및 화학 특성 비교

Comparison of Physical, Optical, and Chemical Properties of Aerosols from Asian Dust and Haze Episodes Observed at Anmyeon-do in 2018~2021

Abstract 

We analyzed the characteristics of aerosol particles contained in Haze and Asian dust using physical, optical, and chemical properties observed in Anmyeon-do over four years (2018~2021). Asian dust and haze are classified by the mass concentration of PM10 and PM2.5. A total of 28 Asian dust cases were observed with a PM10 mass concentration of 105.8±120.0 µg/m3 , which was about three times higher than the average during study periods. There were 138 haze days with a PM2.5 mass concentration of 51.6±16.4 µg/m3 . The scattering coefficient as an optical property of aerosols was 180.5±114.0 Mm-1 for haze cases, which was about 1.7 times higher than Asian dust cases. The absorption coefficient was found to be 12.7±7.9 Mm-1 and 9.3±6.7 Mm-1 for haze and Asian dust cases, respectively. The scattering Ångström exponent was 1.46±0.32 (0.88±0.59) for haze (Asian dust), indicating the dominance of coarse particles in Asian dust. Meanwhile, Asian dust cases had a high proportion of soil-derived chemical components such as Al (23%), Fe (18%), and Ca (14%), while haze had the highest proportion of the anthropogenic component S (37%). Also, for the ionic composition analysis, haze cases had a high percentage of secondary aerosols such as NO3 - (42%), SO4 2- (32%), and NH4 + (23%). The backward trajectory analysis using the HYSPLIT model revealed that the Asian dust was transported to Korea through the Gobi Desert, Inner Mongolia, and Manchuria in northwestern China, known as major sources of Asian dust. For haze, a relatively short trajectory originating from Balhae Bay was found, suggesting that the emitted air pollutants were not likely to spread rapidly but move slowly or stagnate, creating secondary aerosols and causing haze.

Key words 

Asian dust, Haze, Aerosol type, Optical properties, HYSPLIT

▶출처 : 한국대기환경학회지 제 40권 제 2 호, 2024.04