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| DOI | 10.1016/j.atmosenv.2021.118778 |
| Mesoscale variations of the chemical composition of submicron aerosols and its influence on the cloud condensation nuclei activation | |
| Ajith T.C.; Kompalli S.K.; Nair V.S.; Babu S.S. | |
| 发表日期 | 2022 |
| ISSN | 1352-2310 |
| 卷号 | 268 |
| 英文摘要 | Mesoscale variation of the chemical composition of submicron aerosol concentrations and their influence on cloud condensation nuclei (CCN) activation have been examined over a tropical coastal location in peninsular India during the winter season. The land-sea breeze circulation, boundary layer evolution, and photochemical processes significantly influence the diurnal variation of the aerosol chemical composition over the region. Broadly, the organic aerosols (mean ∼37.50 ± 27.00 μg m−3) dominated the submicron mass loading with a mass fraction (MF) of 0.66, followed by sulfate (∼10.92 ± 6.13 μg m−3; MF ∼0.19), ammonium (3.46 ± 1.71 μg m−3; MF∼0.06) and a small contribution from nitrate (1.7 ± 1.5 μg m−3; MF ∼0.03). The average mass concentration of organic carbon (OC) is 8.84 ± 6.42 μg m−3 with a mean organics/OC ratio of ∼3, indicating the presence of aged, highly oxidized organics. The diurnal variation of all the aerosol species, except sulfate, depicted daytime-low and nighttime-high. The photochemical formation of sulfate aerosols overwhelms the reduction in concentration due to boundary layer mixing and sea-land breeze circulation during the daytime. The decrease in the organics/sulfate ratio during the daytime has significant implications on the CCN concentration and its activation properties. The average CCN number concentration and activation ratio (ratio of CCN to total aerosol number concentration) at 0.38% supersaturation during the study period are ∼3756 ± 1609 cm−3 and 0.52 ± 0.17, respectively. The diurnal variation of CCN concentrations and activation ratio is distinctly different. The change in the mode diameter of the number size distribution between sea-land breeze was found to be less (∼8 nm) compared to the large variation in chemical composition. This suggested the importance of mesoscale variations of aerosols, especially the contrasting diurnal variation of organics and sulfate aerosols in CCN activation. © 2021 Elsevier Ltd |
| 关键词 | Carbonaceous aerosolsCCNChemical compositionDiurnal variationMesoscale circulationOrganic aerosols |
| 语种 | 英语 |
| scopus关键词 | Aerosols; Boundary layers; Condensation; Organic carbon; Sulfur compounds; Carbonaceous aerosol; Chemical compositions; Cloud condensation nuclei; Diurnal variation; Mass-fraction; Meso scale; Mesoscale circulation; Organic aerosol; Organics; Submicron aerosol; Chemical activation; ammonia; ammonium nitrate; ammonium sulfate; manganese dioxide; nitrate; organic carbon; sulfate; tetrafluoroethylene; aerosol composition; boundary layer; chemical composition; cloud condensation nucleus; concentration (composition); mesoscale meteorology; supersaturation; aerosol; Article; boundary layer; chemical composition; circadian rhythm; controlled study; light absorption; particle size; photochemistry; photooxidation; seasonal variation; surface property; suspended particulate matter; ultrafine particulate matter; water vapor; wettability; India |
| 来源期刊 | ATMOSPHERIC ENVIRONMENT
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| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/248172 |
| 作者单位 | Space Physics Laboratory, Vikram Sarabhai Space Centre, Thiruvananthapuram, 695022, India; Department of Physics, University of Kerala, Thiruvananthapuram, 695034, India |
| 推荐引用方式 GB/T 7714 | Ajith T.C.,Kompalli S.K.,Nair V.S.,et al. Mesoscale variations of the chemical composition of submicron aerosols and its influence on the cloud condensation nuclei activation[J],2022,268. |
| APA | Ajith T.C.,Kompalli S.K.,Nair V.S.,&Babu S.S..(2022).Mesoscale variations of the chemical composition of submicron aerosols and its influence on the cloud condensation nuclei activation.ATMOSPHERIC ENVIRONMENT,268. |
| MLA | Ajith T.C.,et al."Mesoscale variations of the chemical composition of submicron aerosols and its influence on the cloud condensation nuclei activation".ATMOSPHERIC ENVIRONMENT 268(2022). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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