南京及周边黑碳气溶胶对臭氧影响的观测和数值模拟研究
投稿时间:2019-04-15  修订日期:2019-05-21  点此下载全文
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作者单位E-mail
朱彬 南京信息工程大学 binzhu@nuist.edu.cn 
智利蓉 南京信息工程大学  
高晋徽 南方科技大学  
侯雪伟 南京信息工程大学  
卢文 南京信息工程大学  
基金项目:国家重点研发计划项目(2016YFA0602001);国家自然科学基金资助项目(41575148,41605096)
中文摘要:本研究利用南京地面站点2016-2017的两年黑碳气溶胶(BC)和臭氧(O3)小时观测资料,对比分析了不同季节BC与近地面臭氧的关系。发现高BC(高于平均值)影响下的O3值明显比低BC(低于平均值)影响下的O3值低,秋冬季这种抑制作用明显高于春夏季,且秋冬季 BC与O3反相关也显著高于春夏季,但PM2.5与O3反相关关系并不显著。再利用WRF-Chem模式开展了BC反馈效应对O3影响的个例的数值模拟(2017年12月),再次证实BC对O3存在负反馈的影响。其影响机制是:BC可以通过抑制边界层发展,使近地面NOx积聚从而减少臭氧的化学生成(VOCs控制区);以及通过抑制边界层垂直湍流交换,减少边界层上部高O3向下的湍流输送从而减少近地面O3;也可以通过减少近地面风速从而减少O3的平流输入从而减少地面O3,不同个例的主要控制因子不同,需要详细分析。
中文关键词:黑碳气溶胶  光化学臭氧  观测  数值模拟
 
Observation and Numerical Simulation of the Effect of Black Carbon on Ozone in Nanjing and Surroundings
Abstract:In this study, the relationship between black carbon aerosol (BC) and ozone(O3) in different seasons was analyzed by using the two-year observation data of BC and O3 at Nanjing Ground Station from 2016 to 2017. It was found that the O3 value under the influence of high BC (higher than average) was significantly lower than that under the influence of low BC (lower than average). The inhibition effect in autumn and winter was obviously stronger than that in spring and summer, and the reverse correlation between BC and O3 in autumn and winter was also higher than that in spring and summer, but the reverse correlation between PM2.5 and O3 was not significant. Then, the numerical simulation of the effects of BC feedback on O3 was carried out by using WRF-Chem model (December 2017). The negative feedback effect of BC on O3 was confirmed again. The influencing mechanisms are as follows: The photochemical production of ozone was reduced by the accumulation of NOx near the ground (VOCs depended condition) via the interaction between BC and boundary layer; The inhibition of vertical turbulent exchange in boundary layer weakened the vertical transport of ozone from upper layer of boundary layer to surface and finally reduced the concentration of surface ozone; And by reducing the wind speed near the ground to decrease the advection input of O3 from upwind region . The main control factors of the cases are different and should be analyzed in detail.
keywords:Black carbon  Photochemical ozone  Observation  Numerical simulation
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