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Analysis of water-soluble ions and their precursor gases over diurnal cycle

Title
Analysis of water-soluble ions and their precursor gases over diurnal cycle
Author
김기현
Keywords
PM2.5; Principal component analysis; Inorganic ions; Seasonal variation; Diurnal variation; Source apportionment
Issue Date
2013-11
Publisher
Elsevier Science INC
Citation
Atmospheric Research , 2013, 132, P.309-321
Abstract
A detailed description of an interactive relationship is made between water-soluble ionic components in PM2.5 and their precursor gases using the hourly resolution data measured at an urban monitoring site in Seoul during the year of 2010. Their diurnal variability was found to be correlated with their precursor gases (HNO3 and NH3). In the case of NO3- and NH4+, a close similarity was seen in their diurnal trends, especially during spring. There were no noticeable differences in the formation pathway of NO3-, SO42-, and NH4+ aerosols between day and night. For NO3- formation, heterogeneous hydrolysis of N2O5 might play a significant role in the nighttime enhancement of the oxidation rate. In addition, the concentrations of major anions (e.g. NO3-, SO42-, and Cl-) exhibited highly diverse seasonal patterns with their maximum values occurring in spring, summer, and winter, respectively. The overall results of this study suggest that the formation pathway of NO3- and SO42- aerosols should be regulated by a competing relationship between the NH3-lean (spring and winter) and NH3-rich conditions (summer and fall). (C) 2013 Elsevier B.V. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S0169809513001816?via%3Dihub
ISSN
0169-8095
DOI
10.1016/j.atmosres.2013.06.003
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > CIVIL AND ENVIRONMENTAL ENGINEERING(건설환경공학과) > Articles
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