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Effects of No_x and VoCs from Five Emission Sources on Summer Surface o_3 over the Beijing–Tianjin–Hebei Region

Advances in Atmospheric Sciences 2014年第4期31卷 787-800页

作者： QU Yu AN Junling LI Jian CHEN Yong LI Ying LIU Xingang HU Min State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric Physics Chinese Academy of Sciences State Key Laboratory of Water Environment Simulation School of EnvironmentBeijing Normal University State Key Joint Laboratory of Environment Simulation and Pollution Control College of Environmental Sciences and Engineering Peking University

The impacts of emissions from industry,power plant,transportation,residential,and biogenic sources on daily maximum surface ozone （o3DM） over the Beijing-Tianjin-Hebei （BTH） region in North China in the summer of 2007 were examined in a modeling study.The modeling system consisted of the Weather Research and Forecasting （WRF） model and the photochemical dispersion model,CAMx.The factor separation technique （FST） was used to quantify the effect of individual emission source types and the synergistic interactions among two or more types.Additionally,the effectiveness of emission reduction scenarios was explored.The industry,power plant,and transportation emission source types were found to be the most important in terms of their individual effects on o3DM.The key contributor to high surface o3 was power plant emissions,with a peak individual effect of 40 ppbv in the southwestern BTH area.The individual effect from the biogenic emission category was quite low.The synergistic effects from the combinations of each pair of anthropogenic emission types suppressed o3 formation,while the synergistic effects for combinations of three were favorable for o3 formation when the industrial and power plant emission source types coexisted.The quadruple synergistic effects were positive only with the combination of power plant,transportation,residential,and biogenic sources,while the quintuple synergistic effect showed only minor impacts on o3DM concentrations.A 30％ reduction in industrial and transportation sources produced the most effective impacts on o3 concentrations,with a maximum decrease of 20 ppbv.These results suggested that the synergistic impacts among emission source types should be considered when formulating emission control strategies for o3 reduction.

关键词： o3 CAMx model synergistic effect factor separation technique emission source

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Photochemical production of ozone in marine boundary layer in the sea of Japan:Results of the Rishiri Fall Experiment campaign

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Science China Chemistry 2009年第12期52卷 2366-2372页

作者： QI Bin WANG ZhuQing TAKAMI Akinori HATAKEYAMA Shiro School of Chemistry and Materials Sciences Shaanxi Normal UniversityXi’an 710062China National Institute for Environmental Studies 16-2 OnogawaTsukubaIbaraki 305-8506Japan

The Rishiri Fall Experiment (RISFEX ) campaign was performed in September 2003 at Rishiri island (45.07 N,141.12 E,and 35 m asl) in the sea of Japan to investigate photochemical production of ozone in the marine boundary layer. Total peroxy radicals Rox (Ho2 + Ro2) and Nox (No + No2) were measured together with other chemical species and physical parameters relevant to ozone production. The ozone production rate (P(o3)) was estimated from measured peroxy radicals and was found to be highly variable between days,with 30-min averaged midday values varying from 0.2 to 1.7 ppbv/h (ppbv refers to part per billion by volume). The daytime mean P(o3) for the air masses from relatively clean NE sector is close to zero,but significantly higher for air masses from more polluted W and SE sector,suggesting the impact of transport of pollutants on the remote local ozone production. The experimentally determined P(o3) is compared with those derived from a time-dependent box model based on Regional Atmospheric Chemistry Modeling (RACM),and both the methods give the results generally in agreement. The model calculation shows that Ho2 + No reaction contributes most to ozone production,ca. 60% at midday,followed by the reactions of CH3o2 and ISoP (peroxy radicals formed from isoprene) with No which account for ca. 13% and 10% to ozone production,respectively,at noon. Sensitivity analysis indicates that the ozone production during the measurement period is within Nox-limited regime.

关键词： atmosphere ocean boundary layer o3 production rate photochemistry

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Selective degradation of lignin and elimination of Ho radicals in pulps by o_3 and UV laser flash irradiation

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Science China Chemistry 2002年第3期45卷 311-318页

作者：林鹿周贤涛邱玉桂 State Key Laboratory of Pulp and Paper Engineering College of Environment and Paper engineering South China University of Technology Guangzhou China

Ho radical is an aggressive reagent to abstract hydrogen from diverse substitutes and lead them to degradation, however, in reaction of active oxygen species with lignins, complex phenolic polymers, in dispersed lignocellulose such as pulp for environment-benign delignification, Ho radicals should be eliminated as more as possible to prevent cellulose from unfavorably concomitant degradation. A reaction system of o3 is constructed under UV laser flash irradiation, and Ho radicals are controlled efficiently by it. A new mechanism is proposed, for the first time, that o radicals generated from reaction of o3 with UV laser flash irradiation might be the contributor to scavenge Ho radicals.

关键词： UV laser o3 bleaching selective degradation of lignins.

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Hydrogen and ozone SAW Based Gas Sensors with RF Magnetron Sputtered Ino_x and Electron Beam Evaporated SiN_y

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稀有金属材料与工程 2006年第A3期35卷 206-209页

作者： A.C.Fechete A.Wisitsora-at W.Wlodarskil K.Kalantar-zadeh S.Kandasamy A.S.Holland Sensor Technology Laboratory School of Electrical & Computer EngineeringRMIT UniversityMelbourne V1C 3001Australia NECTEC 112 Thailand Science ParkKIong LuangPathumathani 12120Thailand Sensor Technology Laboratory School of Electrical & Computer EngineeringRMIT UniversityMelbourne VIC 3001Australia

Layered Surface Acoustic Wave (SAW) devices with an Ino_x/SiN_u/36°YX LiTao_3 structure were investigated for sensing low concentrations of hydrogen (H_2) and ozone (o_3) at different operating temperatures.The sensor consists of a 1μm thick silicon nitride (SiN_y) intermediate layer deposited by electron beam evaporation on a 36°Y-cut X-propagating piezoelectric lithium tantalate (LiTao_3) substrate and a 100 nm thin indium oxide (Ino_x) sensing layer deposited by R.F.magnetron sputtering.The device fabrication is described and the performance of the sensor is analyzed in terms of response magnitude as a function of operating temperature.Large frequency shifts of 360 kHz for 600μg/g of H_2 and 92 kHz for 40 ng/g o_3 were recorded.In addition,the surface morphology of the deposited films were investigated by Atomic Force Microscopy (AFM) and the chemical composition by X-Ray Photoelectron Spectroscopy (XPS) to correlate gas-sensing behavior to structural characteristics of the thin film.

关键词： SAW gas sensors E-beam evaporated SiN_y Ino_x o3 H2

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UV-B has larger negative impacts on invasive populations of Triadica sebifera but ozone impacts do not vary

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Journal of Plant Ecology 2016年第1期9卷 61-68页

作者： Hong Wang Xiaochi Ma Ling Zhang Evan Siemann Jianwen Zou College of Resources and Environmental Sciences Nanjing Agricultural UniversityNanjing 210095China Department of Biosciences Rice UniversityHoustonTX 77005USA College of Forestry Jiangxi Agricultural UniversityNanchang 330045China

Aims Abiotic stresses may interact with each other to determine impacts on plants so that their combined impact is less than or more than additive.Increasing UV-B radiation and surface ozone(o3)are two major components of global change that may have such interactive impacts.Moreover,invasive and native populations of plants may respond differently to stresses as they can vary in primary and secondary metabolism.Methods Here,we conducted a factorial field experiment with open-top chambers assigned to an ozone treatment(ambient,100 ppb,or 150 ppb)and UV-B treatment(ambient or increased 20%).We grew seedlings of native and invasive populations of Triadica sebifera in these chambers for one growing season.Important Findings Invasive plants grew faster than native plants in ambient UV-B but they did not differ significantly in elevated UV-B.Litter production of invasive plants was especially sensitive to UV-B in a way that increased with UV-B for native plants but decreased for invasive plants which may be important for nutrient cycling.In ambient UV-B,total mass decreased as ozone increased.Total mass was lower with elevated UV-B but there was no additional impact of increasing ozone.Leaf area did not decrease with UV-B so SLA and LAR were lowest at ambient ozone levels.These results suggest that the effects of ozone will depend on UV-B conditions perhaps due to changes in foliar traits.The traits that allow invasive populations of plants to be successful invaders may make them especially sensitive to UV-B which may reduce their success in future climatic conditions.

关键词： invasive UV-B o3 cross-tolerance litter

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High permittivity and low dielectric loss analysis of lead free Sr_(1-x)La_x(Ti_(0.5) Fe_(0.5))o_3

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Journal of Central South University 2013年第12期20卷 3363-3371页

作者： M.R.Shah A.K.M.Akther Hossain Department of Physics Primeasia University Department of Physics Bangladesh University of Engineering and Technology

The structural and electrical properties of lead free Sr1xLax(Ti0.5 Fe0.5)o3(SLTFo) prepared by standard solid state reaction technique were studied. The X-ray diffraction analysis confirmed the formation of a single-phase cubic perovskite structure. The compositional dependence of lattice constant, density and microstructural studies show that they vary significantly with La3+ content. When measured at 10 kHz, all the compositions of SLTFo at room temperature exhibit a high permittivity(about 104) and low dielectric loss(about 10-3). SLTFo also display minimum dielectric loss within the lower and higher limits of frequency, indicating that the samples are of good quality. It is concluded from the calculated ac conductivity that the conduction is due to mixed polarons hopping. The complex impedance plot exhibits a tendency of forming a single semicircular arc for all compositions, which implies a dominance of grain boundary resistance on the impedance. Impedance parameters were determined by fitting the experimental data with Cole-Cole empirical formula. The results of the present experiment indicate that the lead free SLTFo materials with higher permittivity and lower dielectric loss have possible practical applications.

关键词：高介电常数损耗分析无铅 o3 低介电损耗 X射线衍射分析钙钛矿结构显示频率

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Effect of Methane Emission Increases in East Asia on Atmospheric Circulation and ozone

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Advances in Atmospheric Sciences 2015年第12期32卷 1617-1627页

作者： SHANG Lin LIU Yi TIAN Wenshou ZHANG Yuli Shandong Province Climate Centre Key Laboratory of the Middle Atmosphere and Global Environmental observation Institute of Atmospheric PhysicsChinese Academy of Sciences Key Laboratory for Semi-Arid Climate Change of the Ministry of Education College of Atmospheric SciencesLanzhou University

We used a fully coupled chemistry-climate model （version 3 of the Whole Atmosphere Community Climate Model, WACCM3） to investigate the effect of methane （CH4） emission increases, especially in East Asia and North America, on atmospheric temperature, circulation and ozone （03）. We show that CH4 emission increases strengthen westerly winds in the Northern Hemisphere midlatitudes, accelerate the Brewer-Dobson （BD） circulation, and cause an increase in the mass flux across the tropopause. However, the BD circulation in the tropics between 10°S and 10°N at 100 hPa weakens as CH4 emissions increase in East Asia and strengthens when CH4 emissions increase in North America. When CH4 emissions are increased by 50% in East Asia and 15% globally, the stratospheric temperature cools by up to 0.15 K, and the stratospheric 03 increases by 45 ppbv and 60 ppbv , respectively. A 50% increase of CH4 emissions in North America （with an amplitude of stratospheric 03 increases by 60 ppbv） has a greater influence on the stratospheric 03 than the same CH4 emissions increase in East Asia. CH4 emission increases in East Asia and North America reduce the concentration of tropospheric hydroxyl radicals （4% and 2%, respectively） and increase the concentration of mid-tropospheric 03 （5% and 4%, respectively） in the Northern Hemisphere midlatitudes. When CH4 emissions increase in East Asia, the increase in the tropospheric 03 concentration is largest in August. When CH4 emissions increase in North America, the increase in the 03 concentration is largest in July in the mid-troposphere, and in April in the upper troposphere.

关键词： CH4 temperature Brewer-Dobson circulation o3

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Factors influencing HPAM solution viscosity prepared by produced water using orthogonal method

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Journal of Central South University 2008年第S1期15卷 492-495页

作者：康万利王志伟周阳孟令伟刘述忍白宝君 Enhanced oil Recovery Research Center China University of Petroleum University of Missouri of Science and Technology

The effect of temperature and metal ion components on the viscosity of HPAM solution was studied by means of orthogonal method.Five factors and 4 levels were considered for the orthogonal design.The five factors included temperature,contents of Na+,Mg2+,Ca2+ and S2-,and the four levels mainly considered the level of produced water components in main oilfields in China.The experiment results show that temperature is the most important factor to control HPAM solution viscosity prepared by produced water.The effect of ions was in order of Na+>S2->Mg2+>Ca2+.The mechanism of each factor influencing viscosity was also discussed.Based on the actual condition of Nanyang oilfield,the desulfurization was used to improve the solution viscosity,and satisfactory result was obtained.

关键词： polymer viscosity oil produced water orthogonal method o3

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Vertical observations and Analysis of PM_(2.5),o_3,and No_x at Beijing and Tianjin from Towers during Summer and Autumn 2006

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Advances in Atmospheric Sciences 2010年第1期27卷 123-136页

作者：孙扬王跃思张长春 State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric PhysicsChinese Academy of Sciences Lanzhou University Tianjin Municipal Meteorological Bureau

During the period between 18 August and 22 September 2006, an ultraviolet photometric o3 analyzer, a No-No2-Nox chemiluminescence analyzer, and a quartz micro-oscillating-scale particle concentration analyzer were simultaneously used for monitoring at three different heights each at Beijing （325-m tower） and Tianjin （255-m tower）. These towers belong to the Institute of Atmospheric Physics （IAP） of the Chinese Academy of Sciences （CAS） and to the Tianjin Municipal Meteorological Bureau, respectively. These measurements were used to continuously measure the atmospheric o3 and Nox volume-by-volume concentrations and the PM2.5 mass concentration within a vertical gradient. When combined with meteorological data and information on the variation of vertical characteristics of the various atmospheric pollutants in the two cities, analysis shows that these two cities were seriously polluted by both PM2.5 and o3 during summer and autumn. The highest daily-average concentrations of PM2.5 near the ground in Beijing and Tianjin reached 183 μgm a and 165 μg m^-3, respectively, while the 03 concentrations reached 52 ppb and 77 ppb, and Nox concentrations reached 48 ppb and 62 ppb for these two cities, respectively. The variations in the daily-average concentrations of PM2.5 between Beijing and Tianjin were demonstrated to be consistent over time. The concentrations of PM2.5 measured in Beijing were found to be higher than those in Tianjin. However, the overall o3 concentrations near the ground in Tianjin were higher than in Beijing. Nox concentrations in Tianjin were consistently lower than in Beijing. It was also found that PMz5 pollution in Beijing＇s atmosphere may also be affected by the pollutants originating in and delivered from Tianjin, and that Tianjin was impacted by Beijing＇s pollutants at a significantly reduced level.

关键词： urbanization in Bohai o3 Nox PM2.5 vertical distribution near the ground

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南通市2018—2020年流感样病例监测结果及与坏境的相关性研究

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医学动物防制 2022年第8期38卷 758-762页

作者：王海燕苏婧周洁潘玉平孙怡华南通市疾病预防控制中心微生物检验科江苏226001

目的分析南通市2018—2020年流行性感冒(流感)流行特征及与气象因素的关系,为今后流感防控工作提供依据。方法对南通市2018—2020年流感样病例(influenza like illness, ILI)进行数据分析,采集咽拭子标本,用实时荧光定量反转录PCR方... 详细信息

目的分析南通市2018—2020年流行性感冒(流感)流行特征及与气象因素的关系,为今后流感防控工作提供依据。方法对南通市2018—2020年流感样病例(influenza like illness, ILI)进行数据分析,采集咽拭子标本,用实时荧光定量反转录PCR方法检测核酸进行流感病原分析,采用Spearman法进行秩相关分析ILI与气象因素和大气污染物的关系。结果南通市2018—2020年哨点医院共报告ILI 67 351例,平均ILI就诊比(ILI%)为5.44%,2020年ILI%高达6.28%。ILI报告数和ILI%均呈明显的季节性特征,均在冬季出现高峰。报告的ILI以0~5岁组为主。2018—2020年共采集ILI样本6 746份,检出流感病毒核酸阳性805份,阳性率为11.93%,2020年流感病毒核酸阳性率为5.31%。2018年流感病毒优势毒株为甲型H1N1、乙型Yamagata, 2019年和2020年流感病毒优势毒株均为乙型Victoria。ILI发病率与平均气温和气压变化有一定相关性,即随气温、气压升高,发病率升高;与大气污染物变化也有一定相关性。结论南通市2020年流感流行强度较2018年和2019年明显降低,ILI%和发病率随气温升高而降低,随气压或污染物浓度的升高而升高。

关键词：流感样病例病毒分型儿童气温气压 PM2.5 PM10 Co o3

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