| 南京北郊黑碳气溶胶分布特征及来源 |
| 摘要点击 2191 全文点击 934 投稿时间：2020-01-14 修订日期：2020-04-15 |
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| 中文关键词 黑碳气溶胶 黑碳仪 质量吸收效率(Ångström指数) 潜在源贡献函数法(PSCF) 浓度权重轨迹法(CWT) 南京 |
| 英文关键词 black carbon aerosol aethalometer Ångström exponent potential source contribution function(PSCF) concentration weighted trajectory (CWT) Nanjing |
| 作者 | 单位 | E-mail | | 谢锋 | 南京信息工程大学应用气象学院, 耶鲁大学-南京信息工程大学大气环境中心, 南京 210044
南京信息工程大学气象灾害预报预警与评估协同创新中心, 气象灾害教育部重点实验室, 南京 210044 | 20181208039@nuist.edu.cn | | 林煜棋 | 南京信息工程大学应用气象学院, 耶鲁大学-南京信息工程大学大气环境中心, 南京 210044
南京信息工程大学气象灾害预报预警与评估协同创新中心, 气象灾害教育部重点实验室, 南京 210044 | | | 宋文怀 | 南京信息工程大学应用气象学院, 耶鲁大学-南京信息工程大学大气环境中心, 南京 210044
南京信息工程大学气象灾害预报预警与评估协同创新中心, 气象灾害教育部重点实验室, 南京 210044 | | | 鲍孟盈 | 南京信息工程大学应用气象学院, 耶鲁大学-南京信息工程大学大气环境中心, 南京 210044
南京信息工程大学气象灾害预报预警与评估协同创新中心, 气象灾害教育部重点实验室, 南京 210044 | | | 章炎麟 | 南京信息工程大学应用气象学院, 耶鲁大学-南京信息工程大学大气环境中心, 南京 210044
南京信息工程大学气象灾害预报预警与评估协同创新中心, 气象灾害教育部重点实验室, 南京 210044 | dryanlinzhang@outlook.com |
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| 中文摘要 |
| 黑碳（black carbon，BC）是含碳物质燃烧排放所产生的大气颗粒物（particulate matter，PM）中一种重要组分，其对辐射效应表现为对太阳辐射的吸收和散射，影响着地气系统的能量交换.本研究于2019年1~5月在南京北郊利用黑碳仪AE33（aethalometer，magee）测量了黑碳气溶胶浓度数据，对其日夜变化和季节变化进行分析，并筛选出污染天与清洁天，对其特征和来源进行分析.结果显示采样期间黑炭气溶胶的平均浓度为（3.8±2.3）μg ·m-3，冬季浓度为春季的1.3倍.BC浓度呈现明显的日变化，BC高值出现在日间交通高峰时间段，受到交通排放的影响较大.Ångström指数α冬春整体差异不大，春季为1.32冬季为1.30，此结果也指出BC排放源以机动车排放为主.此外，针对采样期间污染天与清洁天的BC来源特征进行分析，发现污染天机动车排放源占比为68%~87%，清洁天为72%~86%，清洁天来源小幅波动但均以机动车排放源为主，污染天相对而言存在一定的机动车源减少生物质和煤炭燃烧源增加的情况，取决于污染时段的排放情况，利用BC/CO（0.005）进一步验证了上述源解析结果.通过PSCF和CWT分析可以得到南京北郊大气BC颗粒物以本地来源为主，但冬季可能存在来自东南地区的机动车排放来源，春季可能存在来自西南地区的生物质及煤炭燃烧来源.总体看来南京北郊黑碳气溶胶分布以冬高春低，并存在明显日夜变化，主要来源为本地的机动车排放为主. |
| 英文摘要 |
| Black carbon (BC) is an important component of atmospheric particulate matter (PM) emitted during the combustion process. Light absorption and scattering exhibited by BC affect the exchange of solar energy on Earth. In this study, continuous measurements of atmospheric particulate BC were carried out, using a BC analyzer (AE33) in the suburban area of Nanjing from January 2019 to May 2019, to realize the diurnal variations of BC during the different seasons and potential sources of BC during the clean (CD, PM2.5<35 μg ·m-3) and haze days (PD, PM2.5>75 μg ·m-3). The results showed that the average concentration of BC was (3.8±2.3) μg ·m-3; a higher average BC concentration value of (4.3±2.6) μg ·m-3 was observed during the winter, exceeding that during the spring period by a factor of 1.3. The higher BC concentrations during the winter was attributed to the stagnant weather conditions and additional emissions. Significant diurnal cycles of BC were observed with higher BC concentrations during rush hours of traffic, suggesting traffic origins. The Ångström exponent were 1.32 and 1.30 during the spring and winter periods, respectively, indicating that the BC was mainly produced from the traffic emissions during both the seasons. This hypothesis was also supported by the average BC/CO ratio of 0.005, which was similar to that of BC derived by traffic emissions. Moreover, we discovered that the contributions of traffic emissions to BC were 68%-87% and 72%-86% during the haze and clean periods, respectively. This indicated enhanced contributions of coal combustion and biomass burning to BC in Nanjing during the haze events. Finally, using the potential source contribution function (PSCF) and concentration weighted trajectory (CWT) analysis, we highlighted that the BC at the receptor site was mainly from the local emissions in the surrounding areas of Nanjing. |
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