Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1073/pnas.2006716117 |
High concentration of ultrafine particles in the Amazon free troposphere produced by organic new particle formation | |
Bin Zhao; Manish Shrivastava; Neil M. Donahue; Hamish Gordon; Meredith Schervish; John E. Shilling; Rahul A. Zaveri; Jian Wang; Meinrat O. Andreae; Chun Zhao; Brian Gaudet; Ying Liu; Jiwen Fan; Jerome D. Fast | |
2020-09-28 | |
发表期刊 | Proceedings of the National Academy of Science |
出版年 | 2020 |
英文摘要 | The large concentrations of ultrafine particles consistently observed at high altitudes over the tropics represent one of the world’s largest aerosol reservoirs, which may be providing a globally important source of cloud condensation nuclei. However, the sources and chemical processes contributing to the formation of these particles remain unclear. Here we investigate new particle formation (NPF) mechanisms in the Amazon free troposphere by integrating insights from laboratory measurements, chemical transport modeling, and field measurements. To account for organic NPF, we develop a comprehensive model representation of the temperature-dependent formation chemistry and thermodynamics of extremely low volatility organic compounds as well as their roles in NPF processes. We find that pure-organic NPF driven by natural biogenic emissions dominates in the uppermost troposphere above 13 km and accounts for 65 to 83% of the column total NPF rate under relatively pristine conditions, while ternary NPF involving organics and sulfuric acid dominates between 8 and 13 km. The large organic NPF rates at high altitudes mainly result from decreased volatility of organics and increased NPF efficiency at low temperatures, somewhat counterbalanced by a reduced chemical formation rate of extremely low volatility organic compounds. These findings imply a key role of naturally occurring organic NPF in high-altitude preindustrial environments and will help better quantify anthropogenic aerosol forcing from preindustrial times to the present day. |
领域 | 地球科学 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/297987 |
专题 | 地球科学 |
推荐引用方式 GB/T 7714 | Bin Zhao,Manish Shrivastava,Neil M. Donahue,et al. High concentration of ultrafine particles in the Amazon free troposphere produced by organic new particle formation[J]. Proceedings of the National Academy of Science,2020. |
APA | Bin Zhao.,Manish Shrivastava.,Neil M. Donahue.,Hamish Gordon.,Meredith Schervish.,...&Jerome D. Fast.(2020).High concentration of ultrafine particles in the Amazon free troposphere produced by organic new particle formation.Proceedings of the National Academy of Science. |
MLA | Bin Zhao,et al."High concentration of ultrafine particles in the Amazon free troposphere produced by organic new particle formation".Proceedings of the National Academy of Science (2020). |
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