气候变化领域集成服务门户(CCPortal): Investigation of the relationship between the fine mode fraction and Ångström exponent: Cases in Korea

CCPortal

DOI	10.1016/j.atmosres.2020.105217
	Investigation of the relationship between the fine mode fraction and Ångström exponent: Cases in Korea
	Koo J.-H.; Lee J.; Kim J.; Eck T.F.; Giles D.M.; Holben B.N.; Park S.S.; Choi M.; Kim N.; Yoon J.; Lee Y.G.
发表日期	2021
ISSN	0169-8095
卷号	248
英文摘要	Based on long-term AERONET observations in the Korean peninsula, we evaluate how well the Ångström exponent (AE) can describe the regional aerosol size well in comparison to the fine mode fraction (FMF). Despite close relationships between AE and FMF previously reported, we found that AE is not always linearly correlated to the FMF in the Korean peninsula, particularly during the summertime. Seasonal patterns of volume size distribution indicate that the volume median and peak radius of the fine mode are obviously enhanced in the summer. Since the ambient conditions in Korean summer are highly humid, cloudy, and stagnant, the size of regional fine mode aerosol can increase significantly due to hygroscopic growth and/or cloud processing in this highly polluted atmosphere. In contrast to the AE, the AE ratio (AE at longer wavelengths divided by AE at shorter wavelengths; AER) correlates better with the FMF variation in summer, but a little worse in the spring. This suggests that the combined consideration of AE and AER may provide a better characterization relative to FMF. Thus, we try to estimate the FMF based on the multiple linear regression method using both AE and AER. As expected, the estimated FMF shows remarkably high linear correlations with the AERONET FMF without any seasonal bias. These findings imply that the FMF in South Korea can be simply obtained if just the AOT measurement at multiple wavelengths (in the range from ultraviolet to near-infrared channels) are available. © 2020 Elsevier B.V.
英文关键词	AERONET; Fine mode fraction; Hygroscopic growth; Ångström exponent
语种	英语
scopus关键词	Aerosols; Linear regression; Ambient conditions; Hygroscopic growth; Linear correlation; Multiple linear regression method; Multiple wavelengths; Near-infrared channels; Shorter wavelength; Volume size distribution; Infrared devices; AERONET; aerosol; comparative study; correlation; multiple regression; particle size; seasonal variation; size distribution; summer; South Korea
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/141696
作者单位	Department of Atmospheric Sciences, Yonsei University, Seoul, South Korea; Department of Atmospheric Sciences, Chungnam National University, Daejeon, South Korea; NASA Goddard Space Flight Center, Greenbelt, MD, United States; School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology, Ulsan, South Korea; Climate and Air Quality Research Department, National Institute of Environmental Research, Incheon, South Korea
推荐引用方式 GB/T 7714	Koo J.-H.,Lee J.,Kim J.,et al. Investigation of the relationship between the fine mode fraction and Ångström exponent: Cases in Korea[J],2021,248.
APA	Koo J.-H..,Lee J..,Kim J..,Eck T.F..,Giles D.M..,...&Lee Y.G..(2021).Investigation of the relationship between the fine mode fraction and Ångström exponent: Cases in Korea.Atmospheric Research,248.
MLA	Koo J.-H.,et al."Investigation of the relationship between the fine mode fraction and Ångström exponent: Cases in Korea".Atmospheric Research 248(2021).