南京市大气黑碳的吸光性质及其变化特征解析

徐云龙; 单元杰; 张运江; 盖鑫磊

doi:10.13205/j.hjgc.202508010

南京市大气黑碳的吸光性质及其变化特征解析

doi: 10.13205/j.hjgc.202508010

1. 南京信息工程大学环境科学与工程学院, 南京 210044;
2. 东南大学能源与环境学院, 南京 211189

基金项目:

国家自然科学基金项目（42377100）

详细信息

作者简介:
徐云龙（2001－），男，硕士，主要研究方向为大气碳质气溶胶吸光特性及其影响因素。19850061173@163.com

通讯作者:
盖鑫磊（1982－），男，教授，主要研究方向为大气环境化学与大气污染防治。xinlei@seu.edu.cn

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出版历程
- 收稿日期: 2025-05-12
- 录用日期: 2025-07-21
- 修回日期: 2025-06-12

Light absorption properties and temporal variations of atmospheric black carbon in Nanjing

1. School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China;
2. School of Energy and Environment, Southeast University, Nanjing 211189, China

摘要

摘要: 研究于2022年3月初至2023年2月底在南京北郊利用黑碳仪（AE33）测定了气溶胶中黑碳（black carbon，BC）的光吸收系数，结合后向轨迹、潜在来源和日均变化，分析其季节变化特征。结果表明：880 nm处BC吸光系数年均值为13.23 Mm^-1，呈现显著的季节差异（冬季最高，夏季最低）和日变化特征（双峰型分布，与交通早晚高峰吻合）。370nm短波长下，吸光有机物即棕碳（brown carbon，BrC）的吸光贡献在冬季显著增强（占比38.4%），而夏季占比最低（21.4%）。气溶胶吸收指数（AAE）年均值为1.37±0.19，冬季最高（1.51±0.20）。溯源分析进一步揭示，BC主要来自化石燃料燃烧（68.7%），但在冬季生物质燃烧贡献也较为显著（39.9%）。气象因素中，低温、低边界层高度和低风速易导致BC累积，而相对湿度对BC变化的影响较小。后向轨迹与潜在源分析表明，夏季受局地和区域混合源影响，春秋冬季则受周边区域的影响。研究为南京地区BC污染防控提供了一定的科学依据。
- 黑碳 /
- 吸光性质 /
- 来源 /
- 季节变化
Abstract: From March 2022 to February 2023， the light absorption coefficients of black carbon （BC） in aerosols were measured using an Aethalometer （AE33） at a northern suburban site of Nanjing. In combination with backward trajectory analysis， potential source contributions， and diurnal variation patterns， the seasonal characteristics of BC were systematically investigated. The results showed that the annual mean BC absorption coefficient at 880 nm was 13.23 Mm^-1， with significant seasonal variations （highest in winter and lowest in summer） and a distinct diurnal pattern （bimodal distribution， aligning with traffic peaks）. At 370 nm， the absorption contribution of brown carbon （BrC） increased significantly in winter （accounting for 38.4%）， while it was lowest in summer （21.4%）. The annual mean aerosol absorption Ångström exponent （AAE） was 1.37 ± 0.19， peaking in winter （1.51 ± 0.20）， indicating increased contributions from biomass burning. Source apportionment analysis revealed that fossil fuel combustion was the primary BC source （68.7%）， but biomass burning contributed significantly in winter （39.9%）. Meteorological analysis suggested that the low temperature， shallow boundary layer， and weak wind facilitated BC accumulation， while relative humidity had a minor influence. Backward trajectory and potential source analyses indicated that BC in summer was influenced by local and regional mixed sources， whereas in spring， autumn， and winter， it was affected by regional transport from surrounding areas. This study provides useful scientific insights for BC pollution control in the Nanjing.
- black carbon /
- light absorption properties /
- source /
- seasonal variations

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