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Understanding unusually high levels of peroxyacetyl nitrate(PAN) in winter in Urban Jinan,China 认领 引用 被引量：21
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作者 Lu Liu Xinfeng Wang +5 位作者 Jianmin Chen Likun Xue Wenxing Wang Liang Wen Dandan Li Tianshu Chen 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2018年第9期249-260,共12页
Peroxyacetyl nitrate （PAN）, as a major secondary pollutant, has gained increasing worldwide attentions, but relevant studies in China are still quite limited. During winter of 2015 to summer of 2016, the ambient lev... Peroxyacetyl nitrate （PAN）, as a major secondary pollutant, has gained increasing worldwide attentions, but relevant studies in China are still quite limited. During winter of 2015 to summer of 2016, the ambient levels of PAN were measured continuously by an automatic gas chromatograph equipped with an electron capture detector （GC-ECD） analyzer at an urban site in Jinan （China）, with related parameters including concentrations of 03, NO, NO2, PM2.5, HONO, the photolysis rate constant of NO2 and meteorological factors observed concurrently. The mean and maximum values of PAN concentration were （1.89 ± 1.42） and 9.61 ppbv respectively in winter, and （2.54 ± 1.44） and 13.47 ppbv respectively in summer. Unusually high levels of PAN were observed during severe haze episodes in winter, and the formation mechanisms of them were emphatically discussed, Study showed that high levels of PAN in winter were mainly caused by local accumulation and strong photochemical reactions during haze episodes, while mass transport played only a minor role. Accelerated photochemical reactions （compared to winter days without haze） during haze episodes were deduced by the higher concentrations but shorter lifetimes of pAN, which was further supported by the sufficient solar radiation in the photolysis band along with the high concentrations of precursors （NO2, VOCs） and HONO during haze episodes. In addition, significant PAN accumulation during calm weather of haze episodes was verified by meteorological data. 展开更多
关键词 Peroxyacetyl nitrate Winter Haze episodes North China Plain
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Effect of potential HONO sources on peroxyacetyl nitrate(PAN)formation in eastern China in winter 认领 引用 被引量：8
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作者 Jingwei Zhang Yitian Guo +13 位作者 Yu Qu Yong Chen Ruipeng Yu Chaoyang Xue Rui Yang Qiang Zhang Xingang Liu Yujing Mu Jing Wang Can Ye Haihan Zhao Qiangqiang Sun Ziwen Wang Junling An 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2020年第8期81-87,共7页
As an important secondary photochemical pollutant,peroxyacetyl nitrate(PAN)has been studied over decades,yet its simulations usually underestimate the corresponding observations,especially in polluted areas.Recent obs... As an important secondary photochemical pollutant,peroxyacetyl nitrate(PAN)has been studied over decades,yet its simulations usually underestimate the corresponding observations,especially in polluted areas.Recent observations in north China found unusually high concentrations of PAN during wintertime heavy haze events,but the current model still cannot reproduce the observations,and researchers speculated that nitrous acid(HONO)played a key role in PAN formation.For the first time we systematically assessed the impact of potential HONO sources on PAN formation mechanisms in eastern China using the Weather Research and Forecasting/Chemistry(WRF-Chem)model in February of 2017.The results showed that the potential HONO sources significantly improved the PAN simulations,remarkably accelerated the RO x(sum of hydroxyl,hydroperoxyl,and organic peroxy radicals)cycles,and resulted in 80%–150%enhancements of PAN near the ground in the coastal areas of eastern China and 10%–50%enhancements in the areas around 35–40°N within 3 km during a heavy haze period.The direct precursors of PAN were aldehyde and methylglyoxal,and the primary precursors of PAN were alkenes with C>3,xylenes,propene and toluene.The above results suggest that the potential HONO sources should be considered in regional and global chemical transport models when conducting PAN studies. 展开更多
关键词 Nitrous acid(HONO) Peroxyacetyl nitrate(PAN) WRF-Chem model Winter haze RO x cycles
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Seasonal and diurnal variations of atmospheric peroxyacetyl nitrate, peroxypropionyl nitrate, and carbon tetrachloride in Beijing 认领 引用 被引量：22
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作者 Gen Zhang Yujing Mu +4 位作者 Junfeng Liu Chenglong Zhang Yuanyuan Zhang Yujie Zhang Hongxing Zhang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2014年第1期65-74,共10页
Atmospheric peroxyacetyl nitrate （PAN）, peroxypropionyl nitrate （PPN）, and carbon tetrachloride （CCl4） were measured from September 2010 to August 2011 in Beijing. PAN exhibited low values from mid-autumn to ear... Atmospheric peroxyacetyl nitrate （PAN）, peroxypropionyl nitrate （PPN）, and carbon tetrachloride （CCl4） were measured from September 2010 to August 2011 in Beijing. PAN exhibited low values from mid-autumn to early spring （October to March） with monthly average concentrations ranging from 0.28 to 0.73 ppbV, and increased from early spring to summer （March to August）, ranging from 1.37-3.79 ppbV. The monthly variation of PPN was similar to PAN, with low values （below detection limit to 0.18 ppbV） from mid-autumn to early spring, and a monthly maximum in September （1.14 ppbV）. The monthly variation of CCl4 was tightly related to the variation of temperature, exhibiting a minimum in winter （69.3 pptV） and a maximum of 180.6 pptV in summer. Due to weak solar intensity and short duration, PAN and O3 showed no distinct diurnal patterns from morning to night during winter, whereas for other seasons, they both exhibited maximal values in the late afternoon （ca. 15：00 to 16：00 local time） and minimal values during early morning and midnight. Good linear correlations between PAN and PPN were found in autumn （R = 0.91）, spring （R = 0.94）, and summer （R = 0.81）, with slopes of 0.130, 0.222, and 0.133, respectively, suggesting that anthropogenic hydrocarbons dominated the photochemical formation of PANs in Beijing. Positive correlation between PAN and O3 in summer with the low slopes （AO3/APAN） ranging from 9.92 to 18.0 indicated serious air pollution in Beijing, and strong negative correlation in winter reflected strong O3 consumption by NO titration and less thermal decompositin of PAN. 展开更多
关键词 atmospheric peroxyacetyl nitrate peroxypropionyl nitrate carbon tetrachloride Beijing atmosphere
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Wintertime peroxyacetyl nitrate(PAN) in the megacity Beijing: Role of photochemical and meteorological processes 认领 引用 被引量：20
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作者 Hualong Zhang Xiaobin Xu +1 位作者 Weili Lin Ying Wang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2014年第1期83-96,共14页
Previous measurements of peroxyacetyl nitrate （PAN） in Asian megacities were scarce and mainly conducted for relative short periods in summer. Here, we present and analyze the measurements of PAN, O3, NOx, etc., mad... Previous measurements of peroxyacetyl nitrate （PAN） in Asian megacities were scarce and mainly conducted for relative short periods in summer. Here, we present and analyze the measurements of PAN, O3, NOx, etc., made at an urban site （CMA） in Beijing from 25 January to 22 March 2010. The hourly concentration of PAN averaged 0.70 × 10^-9 mol/mol （0.23 × 10^9-3.51 × 10^9 mol/mol） and was well correlated with that of NOa but not O3, indicating that the variations of the winter concentrations of PAN and O3 in urban Beijing are decoupled with each other. Wind conditions and transport of air masses exert very significant impacts on O3, PAN, and other species. Air masses arriving at the site originated either from the boundary layer over the highly polluted N-S-W sector or from the free troposphere over the W-N sector. The descending free-tropospheric air was rich in O3, with an average PAN/O3 ratio smaller than 0.O31, while the boundary layer air over the polluted sector contained higher levels of PAN and primary pollutants, with an average PAN/O3 ratio of 0.11. These facts related with transport conditions can well explain the observed PAN-O3 decoupling. Photochemical production is important to PAN in the winter over Beijing. The concentration of the peroxyacetyl （PA） radicai was estimated to be in the range of 0.0014 × 10^-12～0.0042 × 10^-12 mol/mol. The contributions of the formation reaction and thermal decomposition to PAN＇s variation were calculated and found to be significant even in the colder period in air over Beijing, with the production exceeding the decomposition. 展开更多
关键词 peroxyacetyl nitrate photochemical production wintertime urban Beijing
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Characteristics and sources of peroxyacetyl nitrate(PAN)in the rural North China Plain:Results from1-year continuous observations 认领 引用 被引量：2
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作者 Xin Liu Xiaowei He +7 位作者 Chenglong Zhang Yifei Song Shuyang Xie Chengtang Liu Pengfei Liu Yuanyuan Zhang Yujing Mu Junfeng Liu 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2024年第4期719-731,共13页
Peroxyacetyl nitrate(PAN)is an important photochemical pollutant in the troposphere,whereas long-term measurements are scarce in rural areas in North China Plain(NCP),resulting in unclear seasonal variations and sourc... Peroxyacetyl nitrate(PAN)is an important photochemical pollutant in the troposphere,whereas long-term measurements are scarce in rural areas in North China Plain(NCP),resulting in unclear seasonal variations and sources of PAN in rural NCP.In this study,we conducted a 1-year observation of PAN during 2021-2022 at the rural NCP site.The average concentrations of PAN were 1.10,0.75,0.65,and 0.88 ppbv in spring,summer,autumn,and winter,respectively,with a 1-year average of 0.81±0.60 ppbv.Calculations indicate that the loss of PAN through thermal decomposition in summer accounts for 43.2% of the total formed PAN,which is an important reason for the low concentration of PAN in summer.We speculate that since the correlation between PAN and O3 in winter is significantly lower than that in other seasons,the observed regional transport of PAN cannot be ignored in winter.Through budget analysis,regional transport accounted for 12.8% and 55.9% of the observed PAN on the spring and winter pollution days,respectively,which showed that regional transport played key roles during the photochemical pollution of the rural NCP in winter.The potential source contribution function revealed that the transported PAN mainly comes from southern Hebei in spring.In winter,the transported PAN was mainly from Langfang,Hengshui,and southern Beijing.Our findings may aid in understanding PAN variations in different seasons in rural areas and highlight the impact of regional transport on the PAN budget. 展开更多
关键词 Photochemical pollution Peroxyacetyl nitrate(PAN) Seasonal variations Regional transport Rural area
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Characterization of peroxyacetyl nitrate(PAN)under different PM2.5 concentration in wintertime at a North China rural site 认领 引用 被引量：7
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作者 Zhuoyu Li Guangzhao Xie +5 位作者 Hui Chen Bixin Zhan Lin Wang Yujing Mu Abdelwahid Mellouki Jianmin Chen 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2022年第4期221-232,共12页
As a secondary pollutant of photochemical pollution,peroxyacetyl nitrate(PAN)has attracted a close attention.A four-month campaign was conducted at a rural site in North China Plain(NCP)including the measurement of PA... As a secondary pollutant of photochemical pollution,peroxyacetyl nitrate(PAN)has attracted a close attention.A four-month campaign was conducted at a rural site in North China Plain(NCP)including the measurement of PAN,O3,NOx,PM2.5,oxygenated volatile organic compounds(OVOCs),photolysis rate constants of NO2and O3and meteorological parameters to investigate the wintertime characterization of photochemistry from November 2018 to February 2019.The results showed that the maximum and mean values of PAN were 4.38 and 0.93±0.67 ppbv during the campaign,respectively.The PAN under different PM2.5concentrations from below 75μg/m3up to 250μg/m3,showed different diurnal variation and formation rate.In the PM2.5concentration range of above 250μg/m3,PAN had the largest daily mean value of 0.64 ppbv and the fastest production rate of 0.33 ppbv/hr.From the perspective of PAN’s production mechanism,the light intensity and precursors concentrations under different PM2.5pollution levels indicated that there were sufficient light intensity and high volatile organic compounds(VOCs)and NOxprecursors concentration even under severe pollution level to generate a large amount of PAN.Moreover,the bimodal staggering phenomenon of PAN and PM2.5provided a basis that PAN might aggravate haze through secondary organic aerosols(SOA)formation. 展开更多
关键词 Peroxyacetyl nitrate PM2.5 Wintertime North China Rural site
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Pollution characteristics of peroxyacetyl nitrate in karst areas in Southwest China 认领 引用
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作者 Songjun Guo Xu Wei +9 位作者 Hongjiao Li Wen Qin Yijun Mu Jiongli Huang Chuan Nong Junchao Yang Dabiao Zhang Hua Lin Jingying Mao Zhaoyu Mo 《Atmospheric and Oceanic Science Letters》 CSCD 2024年第2期27-32,共6页
桂林是世界著名的地处喀斯特地区的旅游胜地,其光化学污染问题日益严重,过氧乙酰硝酸酯(PAN)被认为是光化学污染的可靠指标,也是本研究的重点.本研究于2021年10月首次观测了桂林的PAN的浓度为0.087-2.559ppb,同时探讨了PAN典型高值过程... 桂林是世界著名的地处喀斯特地区的旅游胜地,其光化学污染问题日益严重,过氧乙酰硝酸酯(PAN)被认为是光化学污染的可靠指标,也是本研究的重点.本研究于2021年10月首次观测了桂林的PAN的浓度为0.087-2.559ppb,同时探讨了PAN典型高值过程的成因.此次污染主要来源于东北方向污染气团的水平和高空输送,同时,高温,强辐射和低湿度等气象条件也促进了本地PAN的形成.本研究同时估算了桂林市的O3背景浓度为20.347ppb.这项研究为城市的光化学污染控制工作提供了理论基础。 展开更多
关键词 过氧乙酰硝酸酯 光化学反应 传输影响 气象因素
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Peroxyacetyl nitrate measurements by thermal dissociation-chemical ionization mass spectrometry in an urban environment: performance and characterizations 认领 引用 被引量：4
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作者 Xinfeng Wang Tao Wang +4 位作者 Likun Xue Wei Nie Zheng Xu Steven C. N. Poon Wenxing Wang 《Frontiers of Environmental Science & Engineering》 SCIE EI CSCD 2017年第4期145-152,共8页
Peroxyacetyl nitrate （PAN） is an important indicator of photochemical smog and has adverse effects on human health and vegetation growth. A rapid and h!ghly selective technique of thermal dissociation chemical ioniz... Peroxyacetyl nitrate （PAN） is an important indicator of photochemical smog and has adverse effects on human health and vegetation growth. A rapid and h!ghly selective technique of thermal dissociation chemical ionization mass spectrometry （TD-CIMS） was recently developed to measure the abundance of PAN in real time; however, it may be subject to artifact in the presence of nitric oxide （NO）. In this study, we tested the interference of the PAN signal induced by NO, evaluated the performance of TD- CIMS in an urban environment, and investigated the concentration and formation of PAN in urban Hong Kong. NO caused a significant underestimation of the PAN signal in TD-CIMS, with the underestimation increasing sharply with NO concentration and decreasing slightly with PAN abundance. A formula was derived to link the loss of PAN signal with the concentrations of NO and PAN, which can be used for data correction in PAN measurements. The corrected PAN data from TD- CIMS were consistent with those from the commonly used gas chromatography with electron capture detection, which confirms the utility of TD-CIMS in an urban environment in which NO is abundant. In autumn of 2010, the hourly average PAN mixing ratio varied from 0.06 ppbv to 5.17 ppbv, indicating the occurrence of photochemical pollution in urban Hong Kong. The tbrmation efficiency of PAN during pollution episodes was as high as 3.9 to 5.9 ppbv per 100 ppbv ozone. The efficiency showed a near-linear increase with NO, concentration, suggesting a control policy of NO,. reduction for PAN pollution. 展开更多
关键词 TD-CIMS Peroxyacetyl nitrate Interference Photochemical pollution Formation efficiency
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合肥市大气环境中过氧乙酰硝酸酯的污染特征及来源 认领 引用
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作者 耿天召 童欢欢 +1 位作者 赵旭辉 董昊 《环境化学》 CAS CSCD 北大核心 2026年第2期756-767,共12页
为探究合肥市过氧乙酰硝酸酯(peroxyacetyl nitrate,PAN)的污染特征及潜在来源,本研究于2023年12月至2024年11月在合肥市高新区超级站对PAN开展了为期1年的连续在线观测.结果表明,研究期间合肥市PAN年均浓度为(0.81±0.60)×10^... 为探究合肥市过氧乙酰硝酸酯(peroxyacetyl nitrate,PAN)的污染特征及潜在来源,本研究于2023年12月至2024年11月在合肥市高新区超级站对PAN开展了为期1年的连续在线观测.结果表明,研究期间合肥市PAN年均浓度为(0.81±0.60)×10-9,呈现明显的季节变化特征,依次为秋季(1.22±0.76)×10-9>冬季(0.80±0.52)×10-9>春季(0.72±0.37)×10-9>夏季(0.48±0.38)×10-9.PAN日变化呈单峰分布,峰值出现在12:00—17:00,谷值在1:00—8:00.PAN与O3在夏季相关性最强(R2=0.46)、冬季最弱(R2=0.08),夏季PAN/O3比值为0.0176.PAN大气寿命冬季最长(133.0 h),夏季最短(1.3 h).源区分布概率分析显示,春季PAN主要来源为本地生成,秋季PAN主要来源为本地和省内邻近城市(滁州)及东部邻域省份远距离传输影响.本研究揭示了合肥市PAN的变化特征及主导机制,为深入理解光化学污染过程及其科学防控提供基础数据支撑与理论依据. 展开更多
关键词 过氧乙酰硝酸酯(PAN) 光化学污染特征 在线监测
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Inconsistent capacity of potential HONO sources to enhance secondary pollutants:Evidence from WRF-Chem modeling 认领 引用
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作者 Jingwei Zhang Haiyan Ran +13 位作者 Yu Qu Chaofan Lian Weigang Wang Yusheng Zhang Feixue Zheng Xiaolong Fan Dawei Lu Chao Yan Kaspar RDaellenbach Zhiqiang Ma Yongchun Liu Maofa Ge Markku Kulmala Junling An 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2025年第12期812-830,共19页
Nitrous acid(HONO)is a crucial source of OH radicals in the troposphere,significantly enhancing secondary pollutants like secondary organic aerosols(SOA)and peroxyacetyl nitrates(PAN).While prior research has examined... Nitrous acid(HONO)is a crucial source of OH radicals in the troposphere,significantly enhancing secondary pollutants like secondary organic aerosols(SOA)and peroxyacetyl nitrates(PAN).While prior research has examined HONO sources and their total impacts on secondary pollution,the specific enhancement capacity of each individual HONO source remains underexplored.This study uses observational data from 2015 to 2018 for HONO,SOA,and PAN across six sites in China,combined with WRF-Chem model adding six potential HONO sources to evaluate their capacity:traffic emissions(E_traffic),soil emissions(E_soil),indoor-outdoor exchange(E_indoor),nitrate photolysis(P_nit),and NO2 heterogeneous reactions on aerosol and ground surfaces(Het_a,Het_g).The simulated HONO contributions near the ground in urban Beijing were:12%from NO+OH(default source),10%-20%from E_traffic,1%-12%from P_nit,2%-10%from Het_a,and 50%-70% from Het_g.For SOA and PAN,we calculated incremental contributions enhanced by each HONO source and derived enhancement ratios(ERs)normalized against HONO’s contribution:~7 for P_nit,~2 for Het_a,~0.9 for Het_g,~0.8 for E_soil,~0.3 for E_traffic,and~0.1 for E_indoor.HONO sources’capacity to enhance secondary pollutants varies,being larger for aerosol-related sources.Vertical analysis on HONO concentration,spatial distribution,ROx radical cycling rates,and OH enhancements revealed that aerosol-related HONO sources,especially P_nit,contribute more to secondary pollution.Future research should focus more on assessing real-world impacts of HONO sources,besides identifying their budgets.Additionally,uptake coefficient(γ)and nitrate photolysis frequency(Jnitrate)critically affect HONO and secondary pollutant formation,necessitating further investigations. 展开更多
关键词 Nitrous acid WRF-Chem Secondary organic aerosols Peroxyacetyl nitrate Atmospheric oxidation capacity Vertical profiles
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大气PAN污染及与臭氧和PM2.5关系的研究进展 认领 引用 被引量：4
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作者 孙美 乔雪琪 +2 位作者 王逸飞 崔嘉楠 张剑波 《环境科学研究》 CAS CSCD 北大核心 2025年第3期447-459,共13页
过氧乙酰基硝酸酯(PAN)作为一种重要的光化学污染物和指示剂,同时也是氮氧化物(NOx)的关键储库物质,在低温条件下可以长距离传输,并在高温条件下分解释放NOx和自由基,从而影响NOx循环和大气自由基的转化。PAN与臭氧(O3)和... 过氧乙酰基硝酸酯(PAN)作为一种重要的光化学污染物和指示剂,同时也是氮氧化物(NOx)的关键储库物质,在低温条件下可以长距离传输,并在高温条件下分解释放NOx和自由基,从而影响NOx循环和大气自由基的转化。PAN与臭氧(O3)和细颗粒物(PM2.5)的形成相互关联、相互影响,研究其污染特征与成因有助于解析区域复合大气污染机制。本文综述了国内外关于PAN的浓度水平及其变化特点、PAN的源汇机制及污染成因、PAN与O3及PM2.5关系的影响因素和作用途径的研究进展。经梳理发现,我国对于PAN的观测研究尚处于初步阶段,全年PAN浓度存在区域差异性,其中中部地区和大城市的平均PAN浓度高于沿海城市。PAN的浓度水平和变化特征受到地理位置、气象条件和人为排放等多种因素的影响。为了合理解析PAN的污染成因,需要全面考量稳态计算法、光化学盒子模型及大气化学传输模型的优点与局限性及其适用场景。此外,区域传输和前体物的物种组成是影响PAN与O3关系的关键因素,而PAN与PM2.5之间的相互作用机制则涉及气相光化学反应、气溶胶表面非均相反应以及传输过程。未来的研究建议主要包括:进一步探讨PAN污染形成机制,建立更详尽的污染源排放与PAN浓度之间的响应关系;加强PAN对复合污染影响的分析,关注区域污染过程;深入研究气溶胶凝聚相中的PAN化学过程等。 展开更多
关键词 大气复合污染 过氧乙酰硝酸酯(PAN) 臭氧 PM2.5 协同防控
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广东省惠州市PAN及HONO污染特征及影响因素的短期研究 认领 引用 被引量：1
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作者 李俊玲 刘正阳 +7 位作者 闫永馨 宋雨菲 唐伟 李洋 张林 郑雄枫 黄雨林 毕方 《环境科学研究》 CAS CSCD 北大核心 2025年第5期1011-1022,共12页
广东省惠州市作为珠三角东岸的石油化工基地,其空气污染特征和变化规律受自然地理、气候条件及当地产业结构和工业活动的综合影响,具有显著的区域性和行业性特点。本文于2023年10月7−20日,针对该区域亚硝酸(HONO)、过氧乙酸硝酸酯(PAN)... 广东省惠州市作为珠三角东岸的石油化工基地,其空气污染特征和变化规律受自然地理、气候条件及当地产业结构和工业活动的综合影响,具有显著的区域性和行业性特点。本文于2023年10月7−20日,针对该区域亚硝酸(HONO)、过氧乙酸硝酸酯(PAN)及其影响因素开展了综合观测研究,结果表明:①惠州市HONO体积分数整体平稳,夜间略高于白天,体积分数平均值为0.44×10−9,日间体积分数小时平均值为0.37×10−9,夜间体积分数小时平均值为0.43×10−9。②PAN体积分数日变化显著,呈白天高、夜间低的趋势,体积分数平均值为0.15×10−9,日间体积分数小时平均值为0.21×10−9,夜间体积分数小时平均值为0.11×10−9。③惠州市PAN主要源于本地光化学反应,NO与OH自由基的均相反应对HONO贡献较小,气溶胶表面NO2的非均相反应是HONO主要来源。基于观测以及OBM模拟分析发现,日间HONO的生成及光解显著促进PAN生成。研究显示,海湾地区光化学污染中HONO和PAN的体积分数不可忽视,HONO对PAN的生成具有明显的促进作用。 展开更多
关键词 过氧乙酰硝酸酯 气态亚硝酸 污染特征 影响因素
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唐山市夏季大气过氧乙酰硝酸酯污染特征 认领 引用
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作者 屈晓虎 崔志旺 +2 位作者 郭小龙 付国印 董浩 《河北环境工程学院学报》 CAS 2025年第1期76-82,共7页
采用PAN在线分析仪对唐山市2023年8月1日—2023年9月30日的大气光化学污染状况进行观测,分析PAN浓度特征及其主要污染物的关系。结果显示:观测期间PAN日均体积分数为0.297×10-9~7.650×10-9,典型天气PAN体积分数受温度... 采用PAN在线分析仪对唐山市2023年8月1日—2023年9月30日的大气光化学污染状况进行观测,分析PAN浓度特征及其主要污染物的关系。结果显示:观测期间PAN日均体积分数为0.297×10-9~7.650×10-9,典型天气PAN体积分数受温度影响比较显著;唐山夏季PAN体积分数与北京、合肥、杭州、深圳等地观测结果处于同一水平,但相对较高;PAN与J(NO2)日变化趋势比较接近,略有区别;PAN与NO2变化趋势存在一定的相关性,呈现较弱的线性关系;PAN与O3体积分数变化规律相似,在夏季呈现比较类似的变化趋势。 展开更多
关键词 光化学污染 过氧乙酰硝酸酯(PAN) 臭氧(O3) NO2 污染特征
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淄博市大气中过氧乙酰硝酸酯(PAN)污染特征与生成机制 认领 引用
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作者 蔡浩晨 覃泽 +5 位作者 刘妍慧 徐勃 白雯宇 王晓丽 耿春梅 杨文 《中国环境科学》 EI CAS CSCD 北大核心 2025年第8期4173-4183,共11页
为深入探究工业城市过氧乙酰硝酸酯(PAN)的浓度水平及其生成机制,本研究于2023年3月至2024年2月在华北平原淄博市对PAN及其他污染物进行了为期一年的在线观测.研究期间PAN的平均浓度为1.09×10-9(0.03~10.07×10-9),四季... 为深入探究工业城市过氧乙酰硝酸酯(PAN)的浓度水平及其生成机制,本研究于2023年3月至2024年2月在华北平原淄博市对PAN及其他污染物进行了为期一年的在线观测.研究期间PAN的平均浓度为1.09×10-9(0.03~10.07×10-9),四季浓度排序呈现出冬季(2.07×10-9)>秋季(0.98×10-9)>春季(0.64×10-9)>夏季(0.61×10-9)的规律.日变化浓度峰值出现时间存在明显的差异,夏季峰值出现在中午时段(12:00),而冬季则推迟到下午时段(17:00).广义相加模型(GAM)结果表明,PAN浓度受温度和大气氧化性影响显著.基于零维盒子模型(F0AM)计算结果表明,乙醛对过氧乙酰基(PA)的贡献最大(69%),其次是甲基乙二醛的光解(18%)和氧化(11%),PA的损失主要以一氧化氮(NO)(18%)和二氧化氮(NO2)(81%)与PA的相互作用为主;相对增量反应性(RIR)表明PAN的生成对NOx更敏感.该研究丰富了华北平原地区大气PAN污染特征及生成机制的认识,为大气污染管控提供了科技支撑. 展开更多
关键词 过氧乙酰硝酸酯(PAN) 过氧乙酰基(PA) 广义相加模型(GAM) 基于观测模型(OBM)
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天津夏季边界层低层大气中PAN和O_3的输送特征分析 认领 引用 被引量：21
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作者 姚青 马志强 +4 位作者 林伟立 刘敬乐 王晓佳 蔡子颖 韩素芹 《环境科学》 EI CAS CSCD 北大核心 2019年第1期67-75,共9页
采用在线仪器监测分析2017年夏季天津气象铁塔220 m观测平台大气中过氧乙酰硝酸酯(PAN)和O_3的体积分数,并结合气象观测资料和后向轨迹分析PAN和O_3的输送特征.观测期间PAN和O_3体积分数平均值分别为(0.73±0.56)×10-9和(53... 采用在线仪器监测分析2017年夏季天津气象铁塔220 m观测平台大气中过氧乙酰硝酸酯(PAN)和O_3的体积分数,并结合气象观测资料和后向轨迹分析PAN和O_3的输送特征.观测期间PAN和O_3体积分数平均值分别为(0.73±0.56)×10-9和(53±25)×10-9,最大小时体积分数分别为3.49×10-9和137×10-9,PAN和O_3体积分数具有相似的日变化特征,白昼PAN和O_3浓度高于夜间,且PAN和O_3浓度相关系数(R2=0.52)显著高于夜间(R2=0.21).观测期间偏南风下PAN和O_3浓度最高,偏东风下最低,风玫瑰图和后向轨迹聚类分析都表明,来源于西南方向的气流轨迹对应的污染物浓度最高,途经渤海和河北、辽宁沿海地区的偏东气流对应的PAN和O_3体积分数最低,边界层内输送对PAN和O_3的体积分数分布起到了重要作用. 展开更多
关键词 过氧乙酰硝酸酯(PAN) 臭氧 输送特征 边界层 天津
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广州番禺大气成分站一次典型光化学污染过程PAN和O_3分析 认领 引用 被引量：17
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作者 邹宇 邓雪娇 +1 位作者 李菲 殷长秦 《环境科学》 EI CAS CSCD 北大核心 2019年第4期1634-1644,共11页
通过对广州番禺大气成分站(GPACS)的光化学相关污染物(O_3、PAN、VOCs、NO_2、NO)以及气象要素进行观测,分析2010～2016年期间发生在广州地区一次典型光化学污染过程.结果表明,该光化学污染过程期间,O_3和PAN总体体积分数比较高,最大O_... 通过对广州番禺大气成分站(GPACS)的光化学相关污染物(O_3、PAN、VOCs、NO_2、NO)以及气象要素进行观测,分析2010～2016年期间发生在广州地区一次典型光化学污染过程.结果表明,该光化学污染过程期间,O_3和PAN总体体积分数比较高,最大O_3小时体积分数为140. 6×10-9,而最大PAN小时体积分数为4. 7×10-9. NO整体体积分数较低,对O_3的化学滴定和PAN的去除影响较小. NO_2整体体积分数较高、辐射较强和风速较低则有利于O_3和PAN的形成和积累. PAN和O_3具有一定的线性关系(R^2=0. 55),而形成PAN和O_3前体物VOCs物种不完全相同影响着它们的线性关系,在生成PAN的VOCs物种中,乙烯、丙烷、异戊二烯和甲苯所占的比例较大,而对臭氧生成潜势较大的物种有异戊二烯、1,3,5-三甲苯、丙烯、间,对-二甲苯以及甲苯.对PA自由基体积分数进行估算,发现它的日均值体积分数在0. 11×10-12～0. 16×10-12范围变化,远高于其它地区,表明此次发生的光化学反应较为强烈. 展开更多
关键词 光化学污染 过氧乙酰硝酸酯(PAN) 臭氧(O3) 广州
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南京市臭氧、VOCs和PANs污染特征及变化趋势 认领 引用 被引量：23
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作者 张璘 孟晓艳 +6 位作者 秦玮 王晨波 杜嵩山 茅晶晶 袁琦 陈诚 杨雪 《中国环境监测》 CAS CSCD 北大核心 2017年第4期68-76,共9页
对2013—2016年基于国家环境空气质量监测站以及省建大气多参数站所获取的南京市O_3、NO_2、CO、VOCs、PANs观测结果进行综合评价,结果表明:2016年南京市O_3第90百分位日最大8 h平均质量浓度比2013年上升33.3%,超标天数中O_3引起的超标... 对2013—2016年基于国家环境空气质量监测站以及省建大气多参数站所获取的南京市O_3、NO_2、CO、VOCs、PANs观测结果进行综合评价,结果表明:2016年南京市O_3第90百分位日最大8 h平均质量浓度比2013年上升33.3%,超标天数中O_3引起的超标占比增至32.0%。南京市区大气中非甲烷总烃冬季浓度高于夏季,含氧挥发性有机物则与之相反;在5—9月,含氧挥发性有机物组分在日变化过程中出现峰值的时间先后顺序依次为醚、醛、酮类,且O_3和过氧乙酰硝酸酯(PANs)生成存在有一定的线性关系。VOCs/NOx比值表明南京市处于VOCs控制区,因此对NO_2浓度下降不敏感,植物源挥发性有机物连续3年上升,夏季大气光化学反应活性未显著下降,这些现象是城市O_3浓度维持在较高水平的重要因素。 展开更多
关键词 臭氧 VOCs NMHCs OVOCs PANs 光化学反应 敏感性
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气象条件对天津冬季低层大气中PAN浓度的影响 认领 引用 被引量：7
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作者 姚青 马志强 +4 位作者 刘敬乐 王晓佳 杨健博 蔡子颖 韩素芹 《中国环境科学》 EI CAS CSCD 北大核心 2019年第8期3161-3168,共8页
采用在线仪器监测分析2017年冬季天津气象铁塔220m观测平台大气中过氧乙酰硝酸酯(PAN)的体积浓度,并结合污染物资料、气象观测资料和后向轨迹分析造成PAN高值的影响因素.观测期间天津城区大气中PAN的体积浓度平均值为(0.57±0.54)&#... 采用在线仪器监测分析2017年冬季天津气象铁塔220m观测平台大气中过氧乙酰硝酸酯(PAN)的体积浓度,并结合污染物资料、气象观测资料和后向轨迹分析造成PAN高值的影响因素.观测期间天津城区大气中PAN的体积浓度平均值为(0.57±0.54)×10^-9,PAN体积浓度存在2个峰值,大体上对应着2次重污染过程.PAN与O3间不存在明显的相关性,但与PM2.5质量浓度相关性较好,表明光化学反应并非影响冬季PAN浓度的唯一因素,后向轨迹的聚类分析以及改进的静稳指数显示远距离输送和本地积累对PAN浓度的时空分布发挥了较大作用.对观测期间一次重污染天气过程中温度、相对湿度和风的垂直廓线,以及混合层厚度等气象条件的分析表明,PAN浓度上升既受到区域输送影响,也与静稳天气下的污染物积累有关. 展开更多
关键词 过氧乙酰硝酸酯(PAN) 边界层 后向轨迹 重污染过程 天津
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2006年夏季北京大气中PAN与PPN浓度变化和相关性分析 认领 引用 被引量：16
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作者 杨光 张剑波 王斌 《北京大学学报（自然科学版）》 CAS 北大核心 2009年第1期144-150,共7页
采用在线监测仪器，2006年8—9月对北京市中关村地区和大兴区榆垡镇大气中的PAN和PPN体积浓度进行了监测，并对浓度变化的影响因素和相关性进行了分析。结果表明：大气中存在着高浓度的PAN和PPN，中关村大气中PAN和PPN的最高浓度分别达1... 采用在线监测仪器，2006年8—9月对北京市中关村地区和大兴区榆垡镇大气中的PAN和PPN体积浓度进行了监测，并对浓度变化的影响因素和相关性进行了分析。结果表明：大气中存在着高浓度的PAN和PPN，中关村大气中PAN和PPN的最高浓度分别达11219×10^-12。和1953×10^-12L，L，榆垡为2505×10^-12和413×10^-12L/L；两地PAN与PPN的相关性很好，与臭氧也有一定的相关性；热解损失的PAN浓度（TDPAN）与总PAN（监测到的PAN浓度与热解损失PAN浓度之和）的百分比在10％～70％之间。 展开更多
关键词 过氧酰基硝酸酯 在线监测 相关性 热解
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国庆期间南岭背景大气中PAN的浓度特征与来源 认领 引用 被引量：6
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作者 廖敏萍 龚道程 +6 位作者 王少霞 刘涛 王好 邓硕 欧劼 郑昱 王伯光 《中国环境科学》 EI CAS CSCD 北大核心 2021年第6期2493-2503,共11页
为了评估华南地区国庆期间频发的大范围区域光化学污染事件对华南背景大气的影响,2018年国庆节前后(9月19日~10月19日),在广东南岭国家大气背景站对光化学污染的代表产物过氧乙酰硝酸酯(PAN)开展了连续在线观测,并对PAN的浓度特征和来... 为了评估华南地区国庆期间频发的大范围区域光化学污染事件对华南背景大气的影响,2018年国庆节前后(9月19日~10月19日),在广东南岭国家大气背景站对光化学污染的代表产物过氧乙酰硝酸酯(PAN)开展了连续在线观测,并对PAN的浓度特征和来源进行了分析.结果表明,研究期间南岭PAN的平均体积浓度为(0.66±0.54)×10-9,最大值为2.33×10-9,显著高于国内外其他背景站点((0.21~0.44)×10-9),且PAN的夜间浓度一直维持在较高的水平;PAN和O3(r=0.90)、NO2(r=0.87)的相关性较强,通过PAN和O3的线性拟合估算出O3的大气背景体积浓度为(46.22±0.65)×10-9,表明南岭光化学反应十分活跃;受区域光化学污染事件的影响,国庆期间南岭PAN的浓度显著升高,达到(1.18±0.45)×10-9,而同期NO/NO2比值降低,导致PAN大气寿命延长,有利于PAN的本地累积;结合气团后向轨迹,潜在源贡献分布以及前体物NO2的全国分布特征分析,发现国庆期间高浓度PAN主要来自湖南,湖北、河南、江西等华中地区. 展开更多
关键词 过氧乙酰硝酸酯(PAN) 大气氧化性 森林背景站 天井山
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