重庆市棕碳气溶胶吸光特性及其影响因素研究

大气与环境光学学报 ›› 2022, Vol. 17 ›› Issue (1): 135-147.

• “大气气溶胶光学性质”专辑 • 上一篇下一篇

重庆市棕碳气溶胶吸光特性及其影响因素研究

彭超1,2,3, 陈阳2∗, 杨复沫4, 田密5, 翟崇治1,3

1 重庆市生态环境科学研究院, 重庆 401147; 2 中国科学院重庆绿色智能技术研究院, 重庆 401147; 3 重庆市城市大气环境综合观测与污染防控重点实验室, 重庆 401147; 4 四川大学建筑与环境学院, 四川成都 610065; 5 重庆大学环境与生态学院, 重庆 400045

收稿日期:2021-09-13 修回日期:2021-11-05 出版日期:2022-01-28 发布日期:2022-01-28
通讯作者: E-mail: chenyang@cigit.ac.cn E-mail: chenyang@cigit.ac.cn
作者简介:彭超 (1990 - ), 江西萍乡人, 博士, 工程师, 主要从事区域大气复合污染研究。 E-mail: pengchao0623@sina.com
基金资助:
Supported by National Key Research and Development Program of China (国家重点研发计划项目, 2018YFC0214002), Chongqing Science and Technology Commission (重庆市重点研发项目, cstc2018jszx-zdyfxmX0003), Chongqing Fundamental Research Funds (重庆市基本科研业务费计划项目, Cqhky2021jxjl00004)

Light absorption properties and implications of particulate brown carbon in Chongqing

PENG Chao1,2,3, CHEN Yang2∗, YANG Fumo4, TIAN Mi5, ZHAI Chongzhi1,3

1 Chongqing Academy of Environmental Science, Chongqing 401147, China; 2 Research Center for Atmospheric Environment, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 401147, China; 3 Chongqing Key Laboratory of Urban Atmospheric Environment Observation and Pollution Control, Chongqing 401147, China; 4 College of Architecture and Environment, Sichuan University, Chengdu 610065, China; 5 College of Environment and Ecology, Chongqing University, Chongqing 400045, China

Received:2021-09-13 Revised:2021-11-05 Published:2022-01-28 Online:2022-01-28

摘要/Abstract

摘要： 于 2015 年 12 月–2017 年 7 月在重庆城区和远郊站点采集气溶胶样品, 系统研究了该地区气溶胶中棕色碳 (BrC) 吸光特性的时空分布和影响因素, 并评估了 BrC 的辐射吸收贡献。研究结果表明, 该地区冬季 BrC 在 405 nm 的吸光系数 b405,BrC、吸光贡献和单位质量吸光效率均值分别为 (13.0±9.0) Mm−1、 (24.5±6.1)% 和 (0.9±0.2) m2·g−1, 分别是夏季的 11.3、 2.9 和 3.4 倍。城区站点 (YB) 夏、冬季 b405,BrC 值分别为远郊站点 (JY) 的 2.8 和 1.8 倍, 但冬季城区站点气溶胶吸光指数 E 值和 BrC 在 405 nm 的吸光贡献 [(1.2±0.1) 和 (16.7±5.9)%] 低于远郊站点 [(1.6±0.2) 和 (32.3±6.3)%]。 b405,BrC 与污染源示踪组分的相关性分析表明, 夏季 BrC 吸光特性主要受二次有机气溶胶 SOA 生成的影响, 而冬季的主要影响来源于生物质燃烧、燃煤和 SOA 生成。与夏季不同 (p > 0.1), 冬季 b405,BrC 与 NH4+、 E 与 NO3− 和 NH4+ 质量分数均显著相关 (p < 0.001)。冬季 E 与 φ 的拟合关系与生物质燃烧模拟结果相似, 表明生物质燃烧是影响冬季 BrC 吸光特性的主要一次源, 而二次源主要是有机物与 NO3−、 NH4+ 发生的老化过程。重庆冬季 BrC 在 405∼980 nm 和 405∼445 nm 的辐射吸收贡献分别为 (29.1±5.8)%、 (60.8±13.7)%, 约为夏季的 2.9 和 3.2 倍, 表明冬季 BrC 的辐射吸收贡献显著, 尤其是在短波段范围。

关键词: 棕碳气溶胶, 吸光特性, 影响因素, 重庆

Abstract: Aerosol samples were collected at urban and rural sites in Chongqing, China, from December 2015 to July 2017, and then the spatial and seasonal variations of light absorption properties and implications of brown carbon (BrC) in aerosols in this area were systematically investigated, and the radiative forcing of BrC was evaluated. The results show that the average light absorption coefficient b405,BrC, contribution to aerosol light absorption, and mass absorption efficiency of BrC at 405 nm in winter were (13.0±9.0) Mm−1, (24.5±6.1)% and (0.9±0.2) m2·g−1 respectively, about 11.3, 2.9 and 3.4 times of those in summer. The average b405,BrC at urban site (YB) in summer and winter were 2.8 and 1.8 times of those at rural site (JY) respectively. However, the absorption Ångstrom ¨ exponent (E =1.2±0.1) and the contribution to aerosol light absorption of BrC at 405 nm (16.7±5.9)% at YB were significantly lower than those at JY ((1.6±0.2) and (32.3±6.3)%, respectively). The relationships between b405,BrC and the indicators of pollution sources indicated that the light absorption properties of BrC were mainly affected by the formation of secondary organic aerosols (SOA) in summer, while mainly affected by biomass burning, coal burning and the formation of SOA in winter. Compared with those in summer (p > 0.1), the significant correlation between b405,BrC and NH4+ concentrations (p < 0.001), as well as the significant correlations between E and the mass fractions of NO3− and NH4+, were observed in winter. The shape of fit line between E values and φ in winter was similar to that of combustion chamber results of biomass burning, indicating that BrC light absorption was mainly affected by biomass burning and the aged BrC produced from the reactions of organic compounds with NO3− and NH4+ during winter. The fractional contribution of radiation absorbed by BrC was (29.1±5.8)% in 405∼980 nm and (60.8±13.7)% in 405∼445 nm in winter, about 2.9 and 3.2 times those in summer, indicating that the radiation absorbed by BrC was the main contributor affecting the radiative balance during winter, especially at short wavelengths.

Key words: brown carbon aerosol, light absorption properties, influential factors, Chongqing

中图分类号:

X513
X-1

彭超, 陈阳∗, 杨复沫, 田密, 翟崇治, . 重庆市棕碳气溶胶吸光特性及其影响因素研究[J]. 大气与环境光学学报, 2022, 17(1): 135-147.

PENG Chao, CHEN Yang∗, YANG Fumo, TIAN Mi, ZHAI Chongzhi, . Light absorption properties and implications of particulate brown carbon in Chongqing[J]. Journal of Atmospheric and Environmental Optics, 2022, 17(1): 135-147.

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重庆市棕碳气溶胶吸光特性及其影响因素研究

Light absorption properties and implications of particulate brown carbon in Chongqing

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