南昌前湖区域黑碳的分布特征与光学特性  

Distribution and optical properties of black carbon in Qianhu Area of Nanchang

作　　者：高燕[1,2] 黄虹[1,2] 杨心怡[1,2] 王嘉怡 邹长伟 GAO Yan;HUANG Hong;YANG Xinyi;WANG Jiayi;ZOU Changwei(School of Resources and Environment,Nanchang University,Nanchang,330031,China;Key Laboratory of Poyang Lake Environment and Resource Utilization,Ministry of Education,Nanchang,330031,China)

机构地区：[1]南昌大学资源与环境学院,南昌330031 [2]鄱阳湖环境与资源利用教育部重点实验室,南昌330031

出　　处：《环境化学》2024年第3期999-1009,共11页Environmental Chemistry

基　　金：国家自然科学基金(42265011)资助。

摘　　要：2020年12月—2021年12月,对南昌市前湖区域大气中黑碳(BC)进行连续观测,研究BC的分布特征与光学特性.结果显示,南昌前湖区域eBC浓度2021年均值为(1.93±1.13)μg·m^(-3),有明显的季节变化,冬季最高(2.10±1.28)μg·m-3,春季最低(1.69±1.14)μg·m^(-3);eBC浓度日分布表现为明显的双峰特征,峰值出现在07:00—09:00和22:00—23:00.BC吸收系数、大气消光系数年均值为18.42、137.67 Mm^(-1).eBC与NO_(2)的相关性强于eBC与SO_(2)、CO、O_(3)的相关性,反映区域内BC受机动车尾气影响显著.eBC与风速呈负显著性相关(*P<0.05),eBC与气象因子相关性按从大到小顺序为风速>温度>相对湿度,较大的风速更利于BC的扩散稀释.本文研究结果可为区域碳气溶胶的污染防控及其辐射强迫的科学评估提供参考依据和数据支撑.This paper carried out continuous observations of atmospheric black carbon(BC)in the Qianhu region of Nanchang to study the distribution characteristics and optical properties of BC from December 2020 to December 2021.The results of this paper showed that the average concentrations of eBC in the Qianhu region of Nanchang in 2021 was(1.93±1.13)μg·m^(-3).There was a seasonal variation in eBC.The highest in winter was(2.10±1.28)μg·m-3 and the lowest in spring is(1.69±1.14)μg·m^(-3).The daily distribution of eBC concentration showed obvious bimodal characteristics,with peaks at 07:00—09:00 and 22:00—23:00.The annual average values of absorption coefficient and atmospheric extinction coefficient for BC were 18.42 and 137.67 Mm^(-1).The correlation between eBC and NO_(2)was stronger than the correlation between eBC and SO_(2),CO,O_(3),which reflects the significant influence of motor vehicle emissions on BC.eBC was negatively correlated with wind speed(*P<0.05).The correlation between eBC and meteorological factors was wind speed>temperature>relative humidity.Higher wind speeds are more conducive to BC diffusion dilution.The results of the paper can provide reference basis and data support for the scientific assessment of carbonaerosol pollution prevention and control in this region.

关 键 词：黑碳 光学性质 时空分布特征 气象因子 

分 类 号：X513[环境科学与工程—环境工程]