南京青奥会期间棕碳对大气颗粒物光吸收贡献研究

大气与环境光学学报 ›› 2021, Vol. 16 ›› Issue (6): 504-519.

南京青奥会期间棕碳对大气颗粒物光吸收贡献研究

朱晟男1, 李铸杰2, 马嫣1, 戈逸峰1, 郑军1∗

1 南京信息工程大学大气环境与装备技术协同创新中心, 江苏南京 210044; 2 广东省突发事件预警信息发布中心, 广东广州 510080

收稿日期:2020-10-28 修回日期:2021-08-29 出版日期:2021-11-28 发布日期:2021-11-28
通讯作者: E-mail: zheng.jun@nuist.edu.cn E-mail:zheng.jun@nuist.edu.cn
作者简介:朱晟男 (1997 - ), 黑龙江佳木斯人, 硕士研究生, 主要从事大气颗粒物光学性质方面的研究。 E-mail: zsn5166@163.com
基金资助:
Supported by National Natural Science Foundation of China (国家自然科学基金, 91644213, 41730106, 41575122, 41675126, 41975172), National Key Research and Development Project (国家重点研发计划, 2017YFC0209501)

Contribution of Brown Carbon to Light Absorption of Atmospheric Particles During Nanjing Youth Olympic Games

ZHU Shengnan1, LI Zhujie2, Ma Yan1, GE Yifeng1, ZHENG Jun1∗

1 Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing University of Information Science & Technology, Nanjing 210044, China; 2 Guangdong Emergency Early Warning Release Center, Guangzhou 510080, China

Received:2020-10-28 Revised:2021-08-29 Published:2021-11-28 Online:2021-11-28
Contact: Jun ZHENG E-mail:zheng.jun@nuist.edu.cn

摘要/Abstract

摘要： 黑碳 (BC) 和棕碳 (BrC) 是大气中重要的吸光物质。近年来, 大气棕碳光吸收贡献已成为国内外研究热点之一。 2014 年青奥会期间在位于南京江心洲的南京市气象局, 利用三波长光声黑碳光度仪 (PASS-3), 热熔蚀器 (TD), 气溶胶质量分析仪 (APM), 扫描电迁移率粒径谱仪 (SMPS) 和空气动力学粒径谱仪 (APS) 进行了大气实时观测。基于 Mie 模型和 AAE 方法, 计算得出 BrC 在 405 nm 和 532 nm 处的平均光吸收系数分别为 (8.5±4.5) Mm−1 和 (3.2±2.1) Mm−1, 相应的平均光吸收贡献分别为 (22.7±12.0)% 和 (13.6±9.2)%, 说明 BrC 的光吸收能力具有波长依赖性。进而对核-壳和外混两种模型中 αBC 随复折射指数变化做了敏感性分析。在这两种模型中, αBC 均对 BC 核复折射指数虚部最为敏感, 其次是 BC 核复折射指数的实部; 不同的是, 在外混模型中非吸光物质复折射指数实部的改变不会影响 αBC。

关键词: 棕碳, 黑碳气溶胶, 光吸收, 吸收 ?ngstrom ¨ 指数, 敏感性

Abstract: Black carbon (BC) and brown carbon (BrC) are important light absorbers in the atmosphere. Recently, the contribution of atmospheric brown carbon to light absorption has become one of the research hotspots at home and abroad. During the 2014 Nanjing Youth Olympic Games, a real-time atmospheric observation was carried out using three-wavelength photoacoustic soot photometer (PASS-3), thermal denuder (TD), aerosol particle mass analyzer (APM), scanning mobility particle sizer (SMPS) and aerodynamic particle sizer (APS) at Nanjing Meteorological Bureau (32.06◦ N, 118.70◦ E) on Jiangxin Island of Nanjing, China. Based on Mie model and AAE method, the average light absorption coefficients of BrC at 405 and 532 nm were calculated to be (8.5±4.5) Mm−1 and (3.2±2.1) Mm−1, respectively, and the corresponding average light absorption contributions were (22.7±12.0)% and (13.6±9.2)%, indicating that the light absorption capacity of BrC is wavelength dependent. Furthermore, the sensitivity analysis of αBC with the change of refractive index in the core-shell model and external model was conducted. It is shown that in both models, αBC is the most sensitive to the imaginary part of the refractive index of BC core, followed by the real part of the refractive of BC core. While the difference is that in the external mixing model, the change of the real part of the refractive index of the non-light-absorption material does not affect the αBC.

Key words: brown carbon, black carbon aerosol, light absorption, absorption ?ngstrom exponent, sensitivity

中图分类号:

X513

朱晟男, 李铸杰, 马嫣, 戈逸峰, 郑军∗. 南京青奥会期间棕碳对大气颗粒物光吸收贡献研究[J]. 大气与环境光学学报, 2021, 16(6): 504-519.

ZHU Shengnan, LI Zhujie, Ma Yan, GE Yifeng, ZHENG Jun∗. Contribution of Brown Carbon to Light Absorption of Atmospheric Particles During Nanjing Youth Olympic Games[J]. Journal of Atmospheric and Environmental Optics, 2021, 16(6): 504-519.

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