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Effect of atmospheric aerosol on surface ozone variation over the Pearl River Delta region

Science China Earth Sciences 2011年第5期54卷 744-752页

作者： DENG XueJiao ZHOU XiuJi WU Dui TIE XueXi TAN HaoBo LI Fei BI XueYan DENG Tao JIANG DeHai Institute of Tropical and Marine Meteorology Key Open Laboratory for Tropical Monsoon China MeteorologicalAdministration Guangzhou 510080 China Chinese Academy of Meteorological Sciences CMA Beijing 100081 China National Center for atmospheric Research Boulder CO USA

Our analysis of the surface aerosol and ultraviolet （UV） measurements in Pearl River Delta （PRD） region shows that the surface UV radiation is reduced by more than 50% due to high aerosol concentrations. This has important impacts on urban ecosystem and photochemistry, especially on ozone photochemical production over the region. The quantitative effect of aerosols on surface ozone is evaluated by analyzing surface observations （including ozone, ultraviolet radiation, aerosol radiative parameters） and by using radiative and chemical models. A case study shows that the aerosol concentrations and UV radiation are significantly correlated with ozone concentrations. The correlation coefficient between the aerosol optical depth （AOD） and the PM10 mass concentration is very high, with a maximum of 0.98, and the AOD and UV radiation/ozone is anti- correlated, with a correlation coefficient of-0.90. The analysis suggests that ozone productivity is significantly decreased due to the reduction of UV radiation. The noon-time ozone maximum is considerably depressed when AOD is 0.6, and is further decreased when AOD is up to 1.2 due to the reduction of ozone photochemical productivity. Because the occurring probability of aerosol optical depth for AOD550m≥0.6 and AOD340mm ≥1.0 is 47, and 55% respectively during the dry season （October, November, December, January）, this heavy aerosol condition explains the low ozone maximum that often occurs in the dry season over the Guangzhou region. The analysis also suggests that the value of single scattering albedo （SSA） is very sensitive to the aerosol radiative effect when the radiative and chemical models are applied, implying that the value of SSA needs to be carefully studied when the models are used in calculating ozone production.

关键词： atmospheric aerosol ozone photochemical process attenuation

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Filtration of fine particles in atmospheric aerosol with electrospinning nanofibers and its size distribution

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Science China(Technological Sciences) 2014年第2期57卷 239-243页

作者： LI Juan SHI XiaoFei GAO Feng LIU LuQi CHEN Rui CHEN ChunYing ZHANG Zhong National Center for Nanoscience and Technology University of Chinese Academy of Sciences The School of Public Health University of South China

In this study, the size distribution of atmospheric aerosol in Beijing was monitored by the scanning mobility particle sizer spectrometer and the optical particle sizer. The size of particles in atmospheric aerosol was primarily distributed in the range of less than 1 pm. It showed different changes with the mass concentrations of particulate matters with an aerodynamic diameter of 〈2.5 pm （PM2.5） for different sizes of fine particles. The amount of ultrafine particles （less than about 60 nm） decreased while the larger ones （〉60 nm） increased along with the mass concentration of PM2.5 in atmospheric aerosol. This was be- cause of the formation of the secondary atmospheric aerosol. The polylactic acid （PLA） nanofibers were prepared for filtering the aerosol by electrospinning. PLA nanofiber mats were used as the middle layer to design the composite filter membranes. atmospheric aerosol was used as dust source in the filtration test. The results showed that the filtration efficiency of the com- posite filter media increased along with the thickness of nanofiber mats, which was controlled by the collection time during electrospinning. Filtration efficiency can be improved obviously by compositing with a thin layer of nanofibers.

关键词： atmospheric aerosol filtration electrospinning polymer nanofibers

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The role of atmospheric aerosol composition in climate change

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Journal of Environmental Sciences 1993年第2期5卷 169-175页

作者： Su Weihan Wang ShaobinResearch Center for Eco- Environmental Sciences, Chinese Academy of Sciences Beijing 100085, China

The chemical composition of atmospheric aerosols has been investigated. Contributions ofsulfate and soot in aerosols to the atmospheric extinction are studied. Discussions are made on the problems of aerosol emitted from volcano, forest fires in northern China, 1987 and oil field fires in Kuwait, 1991. It is indicated that the changes in concentration, particle size, and chemical composition of aerosol after those events could have impacts on the climate change either regionally or globally and that the impact of aerosol particles on climate change could compensate for some temperature increase caused by greenhouse gases and the increase of surface intensity of ultraviolet radiation due to ozone layer depletion.

关键词： atmospheric aerosol chemical composition climate change.

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An Observational Study on Physical and Optical Properties of atmospheric aerosol in Autumn in Nanjing

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Meteorological and Environmental Research 2014年第2期5卷 24-30页

作者： Qian Ling Yin Yan Qian Jinmin Meteorological Center of East China Regional Air Traffic Administration Civil Aviation Administration of China Key Laboratory of atmospheric Physic and Environment Nanjing University of Information Science and Technology Jingjiang Meteorological Bureau

Based on observing data of atmospheric aerosol in the north suburban area of Nanjing from September to November in 2007, the number concentration, mass concentration, size distribution and optical properties of atmospheric aerosol particles and the relation to meteorological factors were analyzed, and their concentration and optical properties during hazy and non-hazy days were compared. The results showed that aerosol pollution was serious in autumn in this region; the deterioration of visibility had close correlation to fine particles, that is, the average number concen- tration of aerosol was 17 044.2 cm^-3, in which ultra fine particles accounted for 64.3%; the daily average mass concentration of PM2.5 was 281 μg/m3, and the ratio of PM2.5 to PM10 was 0.74; the accumulation mode particles dominated in number and surface concentration distributions, while the volume concentration distribution presented a main peak at size of 1.0 -2.8 μm; fine particles increased during hazy days compared with non-hazy days; the scatter coefficient closely correlated to the particle size, concentration and atmospheric humidity. It was also indicated that meteorological conditions played a critical role in formation of hazy weather, that is, weak large-scale weather systems, low wind speed, high humidity and strong inversion were favorable conditions for hazy weather in autumn.

关键词： atmospheric aerosol Number concentration Size distribution Optical properties Meteorological factors China

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Analysis on the Distribution Characteristics of atmospheric aerosol Particles in Hebei Area in the Cloudy Day Condition

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Meteorological and Environmental Research 2010年第7期1卷 9-11页

作者：孙玉稳孙霞姜岩李云川河北省人工影响天气办公室河北石家庄050021 河北省气象与生态环境重点实验室河北石家庄050021 南京信息工程大学中国气象局大气物理与大气环境重点开放实验室江苏南京210044

By using the probe data of two sorties airplane in the middle and southern parts of Hebei Province in 2007 spring,the characteristics of atmospheric aerosol particles concentration and size distribution in the area in the cloudy day situation were *** results showed that the overall trend of aerosol particles concentration in the weather systems which included the south branch trough and North China low vortex was the decrease as the height ***,if the cirrostratus was in the high altitude,it increased as the height *** the bottom of inversion layer,there existed the obvious accumulation of aerosol and cloud *** by the complex weather systems,the aerosol particle size distribution presented the multi-peak type for the disturbance of updraft or turbulence.

关键词： Hebei atmospheric aerosol Particle size distribution Observation China

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A primarily study on size distribution of polycyclic aromatic hydrocarbons （PAHs） in atmospheric aerosol during foggy days in the suburban area of Nanjing

A primarily study on size distribution of polycyclic aromati...

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第五届海峡两岸气溶胶技术研讨会

作者： HUANG Hongli~(a,c) FAN Shu-xian~(a,b) TANG Lili~c YANG Xuezhen~c LI Hongshuang~c (a Jiangsu Key Laboratory of Meteorological Disaster(Nanjing University of Information Science and Technology) Nanjing 210044,P.R.China )(b LAPC,Institute of atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China )(c College of Environmental Science and Engineering,Nanjing University of Information Science and Technology,Nanjing 210044,China)

＜正＞The purpoea of this study was to characterize size distributions of 16 polycyclic aromatic hydrocarbons （PA Hs） in the suburban area of Nanjing in foggy days Size distribution aerosol samples collected in foggy and fine days have been analyzed by gas chromatography with mass selective detection （GC-MS）.The content of inhalable partides could be reduced by fog,especially at the particle diameter larger than 4.7um could be wiped off *** are two peeks at size diameter 0.65-1.1 and 3.3-4.7um in foggy days,indicating that size distributions of PM were both bi-modal with a peek in the fine partide size and the other peek in the coarsa particle *** nighttime of both sampling weather,PAHs were predominated in fine particles（Dp＜2.1 um）.On the other hand,Fog reduced the concentration of PAHs in coarse particles（Dp＞2.1 um） in nighttime.

关键词： Fog atmospheric aerosol PAHs Size distribution

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Effect of atmospheric aerosols on UV-B radiation reaching the ground

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Journal of Environmental Sciences 1993年第2期5卷 224-229页

作者： Wang Shaobin Su WeihanResearch Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China China

Solar ultraviolet radiation reaching the ground can be reduced due to light scattering of atmospheric aerosols. aerosol pollution has led to the decrease in biological active UV-B radiation by about 45% and 10% in city and rural areas, respectively. In populated areas, effect of aerosol scattering on UV-B radiation may offset the increased amount of UV-B caused by ozone depletion, but in clean areas such as two poles, ozone depletion may have great damage effects on ecosystems.

关键词： atmospheric aerosol UV-B radiation ozone reduction.

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VERTICAL DISTRIBUTION CHARACTERISTICS OF atmospheric aerosolS IN LIAONING

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Acta meteorologica Sinica 2000年第3期14卷 373-382页

作者：杨军周德平宫福久高建春李子华 NanjingInstitute of Meteorology.Nanjing 210044 Liaoning Rain-Making Office.Shenyang 110015 Beijing Research Institute of Applied Meteorology.Beijing 100025 Nanjing Institute of Meteorology Nanjing 210044

16 aircraft missions were conducted for the measurement of atmospheric aerosols in separate days of late spring and early summer of 1996 and *** paper deals with detailed analysis of the variation in vertical/horizontal distributions of the concentration of the particles and their size distribution at 0—5 km above ground,and with the relations to temperature and relative humidity documented in *** suggests that the concentrations show different distribution features in vertical above and below the cap of the mixed layer:the particle size distribution is subject to a range of forming mechanisms,displaying a multi-modal pattern:the horizontal concentration experiences remarkable variation:temperature and relative humidity stratifications have conspicuous influence on the concentration and size distribution of aerosols.

关键词： atmospheric aerosol vertical distribution size distribution aircraft sounding

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Size distributions of aerosol and water-soluble ions in Nanjing during a crop residual burning event

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Journal of Environmental Sciences 2012年第8期24卷 1457-1465页

作者： Honglei Wang Bin Zhu Lijuan Shen Hanqing Kang Key Laboratory of Meteorological Disaster of Ministry of Education Nanjing University of Information Science and TechnologyNanjing 210044China.

To investigate the impact on urban air pollution by crop residual burning outside Nanjing, aerosol concentration, pollution gas concentration, mass concentration, and water-soluble ion size distribution were observed during one event of November 4-9, 2010. Results show that the size distribution of aerosol concentration is bimodal on pollution days and normal days, with peak values at 60- 70 and 200-300 nm, respectively. aerosol concentration is 104 ***-1 on pollution days. The peak value of spectrum distribution of aerosol concentration on pollution days is 1.5-3.3 times higher than that on a normal day. Crop residual burning has a great impact on the concentration of fine particles. Diurnal variation of aerosol concentration is trimodal on pollution days and normal days, with peak values at 03：00, 09：00 and 19：00 local standard time. The first peak is impacted by meteorological elements, while the second and third peaks are due to human activities, such as rush hour traffic. Crop residual burning has the greatest impact on SO2 concentration, followed by NO2, 03 is hardly affected. The impact of crop residual burning on fine particles （〈 2.1 μm） is larger than on coarse particles （〉 2.1 μm）, thus ion concentration in fine particles is higher than that in coarse particles. Crop residual burning leads to similar increase in all ion components, thus it has a small impact on the water-soluble ions order. Crop residual burning has a strong impact on the size distribution of K^＋, Cl^-, Na^＋, and F- and has a weak impact on the size distributions of NH4^＋, Ca^2＋, NO3^- and SO4^2-.

关键词： crop residual burning atmospheric aerosol number concentration mass concentration water-soluble ions size distribution

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Analysis of amino acid enantiomers in ambient aerosols:Effects and removal of coexistent aerosol matrix

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Journal of Environmental Sciences 2024年第3期137卷 732-740页

作者： Ying Li Xiaoying Li Libin Wu Luhan Shi ShanWang Pingqing Fu Yingyi Zhang Senchao Lai The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters Ministry of EducationSchool of Environment and EnergySouth China University of TechnologyGuangzhou 510006China Institute of Surface-Earth System Science School of Earth System ScienceTianjin UniversityTianjin 300072China now at Hong Kong University of Science and Technology Hong Kong 00852China

Amino acids(AAs)including D-and L-enantiomers are a group of organic nitrogen species in ambient *** to the low abundances of AAs(level of ng/m^(3))and the matrix effects by coexistent components,it is challenging to quantify AA enantiomers in ambient aerosols especially under pollution *** this study,we present an optimized method for analyzing AA enantiomers in atmospheric aerosol samples including a pretreatment process and the detection by high performance liquid chromatography coupled to a fuorescence detector(HPLC-FLD).Matrix effects caused by coexistent chemicals on AA enantiomers analysis in ambient aerosol samples were investigated especially for those collected in pollution *** results revealed that the determination of AA enantiomers is significantly affected by the coexistent organic carbon(as a proxy of organic matter)and water-soluble ion of NH_(4)^(+).To remove the matrix effects,we applied a pretreatment using the solid phase extraction column coupled with alkaline adjustment to sample *** pretreatment,18 AAs including 6 pairs of D-and L-enantiomers(i.e.,leucine,isoleucine,valine,alanine,serine,and aspartic acid)can be successfully separated and quantified in aerosol samples by *** recoveries are in the range of 67%-106%.This method was successfully applied to the urban aerosol samples from pollution and non-pollution periods for AA enantiomers *** suggest that the concentrations of D-AAs and the ratio of D-AA/L-AA are indicative of the contribution of bacterial sources and the infuence of biomass burning.

关键词： Amino acid enantiomers atmospheric aerosol Organic carbon Ammonia Chiral ratio

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