Investigation of the relationship between the fine mode fraction and Ångström exponent: Cases in Korea

dc.contributor.authorKoo, Ja-Ho
dc.contributor.authorLee, Juhee
dc.contributor.authorKim, Jhoon
dc.contributor.authorEck, Thomas
dc.contributor.authorGiles, David M.
dc.contributor.authorHolben, Brent N.
dc.contributor.authorPark, Sang Seo
dc.contributor.authorChoi, Myungje
dc.contributor.authorKim, Najin
dc.contributor.authorYoon, Jongmin
dc.contributor.authorLee, Yun Gon
dc.date.accessioned2022-09-21T21:39:58Z
dc.date.available2022-09-21T21:39:58Z
dc.date.issued2020-09-04
dc.description.abstractBased 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.en_US
dc.description.sponsorshipThis study was supported by the Yonsei University Research Fund of 2019 (2019-22-0011) and grant (NRF-2018R1C1B6008223) from the National Research Foundation of Korea (NRF).en_US
dc.description.urihttps://www.sciencedirect.com/science/article/pii/S0169809520311534en_US
dc.format.extent9 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2serx-fspk
dc.identifier.citationKoo, Ja-Ho et al. "Investigation of the relationship between the fine mode fraction and Ångström exponent: Cases in Korea." Atmospheric Research, 248, 105217 (4 September 2020). https://doi.org/10.1016/j.atmosres.2020.105217en_US
dc.identifier.urihttps://doi.org/10.1016/j.atmosres.2020.105217
dc.identifier.urihttp://hdl.handle.net/11603/25786
dc.language.isoen_USen_US
dc.publisherElsevieren_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC GESTAR II Collection
dc.rightsThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.en_US
dc.rightsPublic Domain Mark 1.0*
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/*
dc.titleInvestigation of the relationship between the fine mode fraction and Ångström exponent: Cases in Koreaen_US
dc.typeTexten_US
dcterms.creatorhttps://orcid.org/0000-0001-9801-1610

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