Analysis of Non-linear Relationship of PM2.5 Mass Concentration with Aerosol Extinction Coefficient and RH in Hefei, China
Abstract Optical remote sensing of PM2.5 concentration complements ground-based in situ sampler observations and depends on aerosol extinction-to-mass conversion and meteorological factors. Based on Mie scattering theory, we derived a non-linear analytical expression among the PM2.5 mass concentrati...
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| Format: | Article |
| Language: | English |
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Springer
2023-10-01
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| Series: | Aerosol and Air Quality Research |
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| Online Access: | https://doi.org/10.4209/aaqr.230139 |
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| author | Yinan Chen Shiguo Zhang Yonghua Wu Kee Yuan Jian Huang Dongfeng Shi Shunxing Hu |
| author_facet | Yinan Chen Shiguo Zhang Yonghua Wu Kee Yuan Jian Huang Dongfeng Shi Shunxing Hu |
| author_sort | Yinan Chen |
| collection | DOAJ |
| description | Abstract Optical remote sensing of PM2.5 concentration complements ground-based in situ sampler observations and depends on aerosol extinction-to-mass conversion and meteorological factors. Based on Mie scattering theory, we derived a non-linear analytical expression among the PM2.5 mass concentration, aerosol extinction coefficient, and hygroscopic factor. We analyzed 1-year data of aerosol size distribution, PM2.5, visibility, and relative humidity (RH) and refined the exponential factors for improving PM2.5 estimated from the aerosol extinction coefficient in Hefei, China. Aerosol size distribution data on adjacent days were used to approximate the hygroscopic factors of the aerosols. The measured PM2.5 in 2020 was used to refine the exponential factors relevant to the large aerosol extinction coefficient and RH in the analytical function. Next, we evaluated the derived PM2.5 from aerosol extinction with the tapered element oscillating microbalance (TEOM), which independently observed PM2.5 in January 2021; their comparisons indicated good consistency and strong correlation with a linear correlation coefficient of R2 = 0.76. Finally, by applying the analytical function of PM2.5 and aerosol extinction, we obtained the spatial and vertical distribution of PM2.5 from the NASA/CALIPSO-observed aerosol extinction profiles, which showed reasonable agreement and good correlation with the TEOM-measured PM2.5 in several major cities in Anhui Province, China. |
| format | Article |
| id | doaj-art-0cfaf1e28b874e429147fcb599b96581 |
| institution | Kabale University |
| issn | 1680-8584 2071-1409 |
| language | English |
| publishDate | 2023-10-01 |
| publisher | Springer |
| record_format | Article |
| series | Aerosol and Air Quality Research |
| spelling | doaj-art-0cfaf1e28b874e429147fcb599b965812025-02-09T12:23:11ZengSpringerAerosol and Air Quality Research1680-85842071-14092023-10-01231211810.4209/aaqr.230139Analysis of Non-linear Relationship of PM2.5 Mass Concentration with Aerosol Extinction Coefficient and RH in Hefei, ChinaYinan Chen0Shiguo Zhang1Yonghua Wu2Kee Yuan3Jian Huang4Dongfeng Shi5Shunxing Hu6Key Laboratory of Atmospheric Optics, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of SciencesKey Laboratory of Atmospheric Optics, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of SciencesOptical Remote Sensing Lab, the City College of New York (CCNY)Key Laboratory of Atmospheric Optics, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of SciencesKey Laboratory of Atmospheric Optics, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of SciencesKey Laboratory of Atmospheric Optics, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of SciencesKey Laboratory of Atmospheric Optics, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of SciencesAbstract Optical remote sensing of PM2.5 concentration complements ground-based in situ sampler observations and depends on aerosol extinction-to-mass conversion and meteorological factors. Based on Mie scattering theory, we derived a non-linear analytical expression among the PM2.5 mass concentration, aerosol extinction coefficient, and hygroscopic factor. We analyzed 1-year data of aerosol size distribution, PM2.5, visibility, and relative humidity (RH) and refined the exponential factors for improving PM2.5 estimated from the aerosol extinction coefficient in Hefei, China. Aerosol size distribution data on adjacent days were used to approximate the hygroscopic factors of the aerosols. The measured PM2.5 in 2020 was used to refine the exponential factors relevant to the large aerosol extinction coefficient and RH in the analytical function. Next, we evaluated the derived PM2.5 from aerosol extinction with the tapered element oscillating microbalance (TEOM), which independently observed PM2.5 in January 2021; their comparisons indicated good consistency and strong correlation with a linear correlation coefficient of R2 = 0.76. Finally, by applying the analytical function of PM2.5 and aerosol extinction, we obtained the spatial and vertical distribution of PM2.5 from the NASA/CALIPSO-observed aerosol extinction profiles, which showed reasonable agreement and good correlation with the TEOM-measured PM2.5 in several major cities in Anhui Province, China.https://doi.org/10.4209/aaqr.230139PM2.5Aerosol size distributionExtinction coefficientHygroscopic factor |
| spellingShingle | Yinan Chen Shiguo Zhang Yonghua Wu Kee Yuan Jian Huang Dongfeng Shi Shunxing Hu Analysis of Non-linear Relationship of PM2.5 Mass Concentration with Aerosol Extinction Coefficient and RH in Hefei, China Aerosol and Air Quality Research PM2.5 Aerosol size distribution Extinction coefficient Hygroscopic factor |
| title | Analysis of Non-linear Relationship of PM2.5 Mass Concentration with Aerosol Extinction Coefficient and RH in Hefei, China |
| title_full | Analysis of Non-linear Relationship of PM2.5 Mass Concentration with Aerosol Extinction Coefficient and RH in Hefei, China |
| title_fullStr | Analysis of Non-linear Relationship of PM2.5 Mass Concentration with Aerosol Extinction Coefficient and RH in Hefei, China |
| title_full_unstemmed | Analysis of Non-linear Relationship of PM2.5 Mass Concentration with Aerosol Extinction Coefficient and RH in Hefei, China |
| title_short | Analysis of Non-linear Relationship of PM2.5 Mass Concentration with Aerosol Extinction Coefficient and RH in Hefei, China |
| title_sort | analysis of non linear relationship of pm2 5 mass concentration with aerosol extinction coefficient and rh in hefei china |
| topic | PM2.5 Aerosol size distribution Extinction coefficient Hygroscopic factor |
| url | https://doi.org/10.4209/aaqr.230139 |
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