Changes in the Ångstrom Exponent during Aerosol Coagulation and Condensation
In this study, the Ångstrom exponent for polydispersed aerosol during dynamic processes was investigated. Log-normal aerosol size distribution was assumed, and a sensitivity analysis of the Ångstrom exponent with regards the coagulation and condensation process was performed. The Ångstrom exponent i...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Springer
2012-12-01
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| Series: | Asian Journal of Atmospheric Environment |
| Subjects: | |
| Online Access: | http://asianjae.org/_common/do.php?a=full&b=11&bidx=1576&aidx=19880 |
| _version_ | 1827835957611593728 |
|---|---|
| author | Chang H. Jung Ji Yi Lee Yong P. Kim |
| author_facet | Chang H. Jung Ji Yi Lee Yong P. Kim |
| author_sort | Chang H. Jung |
| collection | DOAJ |
| description | In this study, the Ångstrom exponent for polydispersed aerosol during dynamic processes was investigated. Log-normal aerosol size distribution was assumed, and a sensitivity analysis of the Ångstrom exponent with regards the coagulation and condensation process was performed. The Ångstrom exponent is expected to decrease because of the particle growth due to coagulation and condensation. However, it is difficult to quantify the degree of change. In order to understand quantitatively the change in the Ångstrom exponent during coagulation and condensation, different real and imaginary parts of the refractive index were considered. The results show that the Ångstrom exponent is sensitive to changes in size distribution and refractive index. The total number concentration decreases and the geometric mean diameter of aerosols increase during coagulation. On the while, the geometric standard deviation approaches monodispersed size distribution during the condensation process, and this change in size distribution affects the Ångstrom exponent. The degree of change in the Ångstrom exponent depends on the refractive index and initial size distribution, and the size parameter changes with the Ångstrom exponent for a given refractive index or chemical composition; this indicates that the size distribution plays an important role in determining the Ångstrom exponent as well as the chemical composition. Subsequently, this study shows how the Ångstrom exponent changes quantitatively during the aerosol dynamics processes for a log-normal aerosol size distribution for different refractive indices; the results showed good agreement with the results for simple analytic size distribution solutions. |
| first_indexed | 2024-03-12T06:18:44Z |
| format | Article |
| id | doaj.art-64a956d2d4bb4abaa32839fde5bb75df |
| institution | Directory Open Access Journal |
| issn | 1976-6912 2287-1160 |
| language | English |
| last_indexed | 2024-03-12T06:18:44Z |
| publishDate | 2012-12-01 |
| publisher | Springer |
| record_format | Article |
| series | Asian Journal of Atmospheric Environment |
| spelling | doaj.art-64a956d2d4bb4abaa32839fde5bb75df2023-09-03T02:23:18ZengSpringerAsian Journal of Atmospheric Environment1976-69122287-11602012-12-016430431310.5572/ajae.2012.6.4.304Changes in the Ångstrom Exponent during Aerosol Coagulation and CondensationChang H. Jung0Ji Yi Lee1Yong P. Kim2Department of Health Management, Kyungin Women’s College, 101 Gyesan-gil, Gyeyang-gu, Incheon 407-740, KoreaDepartment of Environmental Engineering, Chosun University, 309 Pilmun-daero, Dong-gu Gwangju 501-759, KoreaDepartment of Environmental Science and Engineering, Ewha Womans University, 11-1 Daehyun-dong, Seodaemun-gu, Seoul 120-750, KoreaIn this study, the Ångstrom exponent for polydispersed aerosol during dynamic processes was investigated. Log-normal aerosol size distribution was assumed, and a sensitivity analysis of the Ångstrom exponent with regards the coagulation and condensation process was performed. The Ångstrom exponent is expected to decrease because of the particle growth due to coagulation and condensation. However, it is difficult to quantify the degree of change. In order to understand quantitatively the change in the Ångstrom exponent during coagulation and condensation, different real and imaginary parts of the refractive index were considered. The results show that the Ångstrom exponent is sensitive to changes in size distribution and refractive index. The total number concentration decreases and the geometric mean diameter of aerosols increase during coagulation. On the while, the geometric standard deviation approaches monodispersed size distribution during the condensation process, and this change in size distribution affects the Ångstrom exponent. The degree of change in the Ångstrom exponent depends on the refractive index and initial size distribution, and the size parameter changes with the Ångstrom exponent for a given refractive index or chemical composition; this indicates that the size distribution plays an important role in determining the Ångstrom exponent as well as the chemical composition. Subsequently, this study shows how the Ångstrom exponent changes quantitatively during the aerosol dynamics processes for a log-normal aerosol size distribution for different refractive indices; the results showed good agreement with the results for simple analytic size distribution solutions.http://asianjae.org/_common/do.php?a=full&b=11&bidx=1576&aidx=19880aerosol size distributioncoagulationcondensationångstrom exponentpolydispersed aerosolaerosol optical properties |
| spellingShingle | Chang H. Jung Ji Yi Lee Yong P. Kim Changes in the Ångstrom Exponent during Aerosol Coagulation and Condensation Asian Journal of Atmospheric Environment aerosol size distribution coagulation condensation ångstrom exponent polydispersed aerosol aerosol optical properties |
| title | Changes in the Ångstrom Exponent during Aerosol Coagulation and Condensation |
| title_full | Changes in the Ångstrom Exponent during Aerosol Coagulation and Condensation |
| title_fullStr | Changes in the Ångstrom Exponent during Aerosol Coagulation and Condensation |
| title_full_unstemmed | Changes in the Ångstrom Exponent during Aerosol Coagulation and Condensation |
| title_short | Changes in the Ångstrom Exponent during Aerosol Coagulation and Condensation |
| title_sort | changes in the angstrom exponent during aerosol coagulation and condensation |
| topic | aerosol size distribution coagulation condensation ångstrom exponent polydispersed aerosol aerosol optical properties |
| url | http://asianjae.org/_common/do.php?a=full&b=11&bidx=1576&aidx=19880 |
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