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| 1 | Characteristics of one-year observation of VOCs,NOx, and O_3 at an urban site in Wuhan, China显示文摘A continuous online observation of ozone and its precursors(NOx, VOCs) was carried out in central urban Wuhan from September 2016 to August 2017. The concentration levels of ozone,NOx, VOCs and their variations in urban Wuhan were analyzed, as well as effects of VOCs on ozone photochemical generation and the main controlling factors for ozone production. During the observation period, the average concentrations of ozone and NOx in Wuhan was 22.63 and30.14 ppbv, respectively, and the average concentration of VOCs was 32.61 ppbv(42.3% alkanes,13.0% alkenes, 10.0% aromatics, 7.3% acetylene, 9.9% OVOCs, and 10.5% halohydrocarbons).Ozone concentration was higher in spring and summer as compared with autumn and winter,wheras VOCs and NOx concentratios were lower in spring and summer but higher in autumn and winter. Aromatics and alkenes, two of VOCs species, showed the highest contributions to ozone formation potential in Wuhan(35.7% alkenes, 35.4 aromatics, 17.5% alkanes, 8.6% OVOCs,1.6% halogenated hydrocarbons, and 1.4% acetylene). Among all VOCs species, those with the highest contribution were ethylene, m-xylene, toluene, propylene and o-xylene. The contribution of these five compounds to the total ozone formation potential concentration was 43.90%.Ozone-controlling factors in Wuhan changed within one day; during the early morning hours(6:00–9:00), VOCs/NOx was low, and ozone generation followed a VOCs-limited regime.However, during the peak time of ozone concentration(12:00–16:00), the ratio of VOCs/NOx was relatively high, suggesting that ozone generation followed a NOx-limited regime. | Yichang Yang Xingang Liu Jun Zheng Qinwen Tan Miao Feng Yu Qu Junling An Nianliang Cheng | 2019 | Journal of Environmental Sciences2019，31，5： | 26 |
| 2 | Chemical characterization of size-resolved aerosols in four seasons and hazy days in the megacity Beijing of China显示文摘Size-resolved aerosol samples were collected by MOUDI in four seasons in 2007 in Beijing. The PM10 and PM1.8mass concentrations were 166.0 ± 120.5 and 91.6 ± 69.7 μg/m^3, respectively,throughout the measurement, with seasonal variation: nearly two times higher in autumn than in summer and spring. Serious fine particle pollution occurred in winter with the PM1.8/PM10 ratio of 0.63, which was higher than other seasons. The size distribution of PM showed obvious seasonal and diurnal variation, with a smaller fine mode peak in spring and in the daytime. OM(organic matter = 1.6 × OC(organic carbon)) and SIA(secondary inorganic aerosol) were major components of fine particles, while OM, SIA and Ca_2+were major components in coarse particles. Moreover, secondary components, mainly SOA(secondary organic aerosol) and SIA,accounted for 46%–96% of each size bin in fine particles, which meant that secondary pollution existed all year. Sulfates and nitrates, primarily in the form of(NH_4)_2SO_4, NH_4NO_3, Ca SO_4, Na_2SO_4 and K_2SO_4, calculated by the model ISORROPIA II, were major components of the solid phase in fine particles. The PM concentration and size distribution were similar in the four seasons on non-haze days, while large differences occurred on haze days, which indicated seasonal variation of PM concentration and size distribution were dominated by haze days. The SIA concentrations and fractions of nearly all size bins were higher on haze days than on non-haze days, which was attributed to heterogeneous aqueous reactions on haze days in the four seasons. | Kang Sun Xingang Liu Jianwei Gu Yunpeng Li Yu Qu Junling An Jingli Wang Yuanhang Zhang Min Hu Fang Zhang | 2015 | Journal of Environmental Sciences2015，27，6： | 19 |
| 3 | Effects of NO_x and VOCs from Five Emission Sources on Summer Surface O_3 over the Beijing–Tianjin–Hebei Region显示文摘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 O3was 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 O3formation, while the synergistic effects for combinations of three were favorable for O3formation 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 O3DMconcentrations. A 30% reduction in industrial and transportation sources produced the most effective impacts on O3concentrations, 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 O3reduction. | QU Yu AN Junling LI Jian CHEN Yong LI Ying LIU Xingang HU Min | 2014 | Advances in Atmospheric Sciences2014，31，4： | 13 |
| 4 | Characteristics and formation mechanism of regional haze episodes in the Pearl River Delta of China显示文摘To investigate the characteristics and the specific mechanism of continuous haze,comprehensive measurements were conducted from 15 October to 19 November in the Atmospheric Environment Monitoring Super-Station in Heshan of Guangdong province.Five haze episodes occurred in October and November 2014 in the Pearl River Delta(PRD)region. The meteorological parameters, gas data, chemical compositions, and optical parameters of the aerosols were obtained. Among these events, the second haze episode,with the highest concentration of PM2.5 of 187.51 μg/m^3, was the most severe. NO^3-was always higher than SO_4^(2-), which indicated that motor vehicles played an important role in the haze, even though the oxidation rate from SO_2 to SO_4^(2-)was faster than that of NOXto NO_3^-. The difference between the hourly averages of Na+and K+during the haze episode and clean days was small, implying that straw combustion and sea salt had no significant effect on the occurrence of haze, and the backward trajectories of the air masses also conformed with this result. The air pollutants were difficult to disperse because of the significant decrease in the planetary boundary layer(PBL) height. Relative humidity played a crucial role in the formation of haze by leading to hygroscopic growth of the diameter of aerosols. | Wenguang Li Xingang Liu Yuanhang Zhang Kang Sun Yusheng Wu Rui Xue Limin Zeng Yu Qu Junling An | 2018 | Journal of Environmental Sciences2018，30，1： | 11 |
| 5 | An overview of emissions of SO2 and NOx and the long-range transport of oxidized sulfur and nitrogen pollutants in East Asia显示文摘The long-range transport of oxidized sulfur(sulfur dioxide(SO_2) and sulfate) and oxidized nitrogen(nitrogen oxides(NO_x ) and nitrate) in East Asia is an area of increasing scientific interest and political concern. This paper reviews various published papers, including ground- and satellite-based observations and numerical simulations. The aim is to assess the status of the anthropogenic emissions of SO_2 and NO_x and the long-range transport of oxidized S and N pollutants over source and downwind region. China has dominated the emissions of SO_2 and NO_x in East Asia and urgently needs to strengthen the control of their emissions, especially NO_x emissions. Oxidized S and N pollutants emitted from China are transported to Korea and Japan, due to persistent westerly winds, in winter and spring.However, the total contributions of China to S and N pollutants across Korea and Japan were not found to be dominant over longer time scales(e.g., a year). The source–receptor relationships for oxidized S and N pollutants in East Asia varied widely among the different studies. This is because:(1) the nonlinear effects of atmospheric chemistry and deposition processes were not well considered, when calculating the source–receptor relationships;(2) different meteorological and emission data inputs and solution schemes for key physical and chemical processes were used; and(3) different temporal and spatial scales were employed. Therefore, simulations using the same input fields and similar model configurations would be of benefit, to further evaluate the source–receptor relationships of the oxidized S and N pollutants. | Yu Qu Junling An Youjiang He Jun Zheng | 2016 | Journal of Environmental Sciences2016，28，6： | 8 |
| 6 | A Self-certified Cross-Cluster Asymmetric Group Key Agreement for Wireless Sensor Networks显示文摘Wireless sensor networks have some obvious characteristics, such as communication range is limited, computing power is limited and energy is limited. Group key agreement in this environment requires a cross-cluster, computation and communication overhead are lightweight and highly safe group key agreement protocol. Aiming at these demands, the paper proposes a Self-certified cross-cluster Asymmetric group key agreement(SC-AGKA). To establish a lightweight and efficient group communication channel among sensor nodes. According to the cluster head as the bridge node to realize the sensor nodes in different cluster have the same group key information, and negotiate a pair of asymmetric group keys to realize the cross cluster secure communication. The group communication adopts asymmetric encryption mechanism. It realizes the group security communication mechanism of message sender unconstraint. The asymmetric group key agreement has the key self-certified, which does not need additional rounds to verify the correctness of group key. Proven and analysis show that the proposed protocol has the advantages of in security and energy consumption. | ZHANG Qikun LI Yongjiao ZHANG Quanxin YUAN Junling WANG Ruifang GAN Yong TAN Yu'an | 2019 | Chinese Journal of Electronics2019，28，2： | 5 |
| 7 | Impacts of Uncertainty in AVOC Emissions on the Summer RO_x Budget and Ozone Production Rate in the Three Most Rapidly-Developing Economic Growth Regions of China显示文摘High levels of uncertainty in non-methane volatile organic compound(NMVOC) emissions in China could lead to significant variation in the budget of the sum of hydroxyl(OH) and peroxy(HO2, RO2) radicals(ROx= OH + HO2+ RO2)and the ozone production rate [P(O3)], but few studies have investigated this possibility, particularly with three-dimensional air quality models. We added diagnostic variables into the WRF-Chem model to assess the impact of the uncertainty in anthropogenic NMVOC(AVOC) emissions on the ROxbudget and P(O3) in the Beijing–Tianjin–Hebei region, Yangtze River Delta, and Pearl River Delta of China. The WRF-Chem simulations were compared with satellite and ground observations,and previous observation-based model studies. Results indicated that 68% increases(decreases) in AVOC emissions produced4%–280% increases(2%–80% decreases) in the concentrations of OH, HO2, and RO2 in the three regions, and resulted in35%–48% enhancements(26%–39% reductions) in the primary ROxproduction and ~ 65% decreases(68%–73% increases)of the P(O3) in Beijing, Shanghai, and Guangzhou. For the three cities, the two largest contributors to the ROxproduction rate were the reaction of O1 D + H2 O and photolysis of HCHO, ALD2, and others; the reaction of OH + NO2(71%–85%)was the major ROxsink; and the major contributor to P(O3) was the reaction of HO2+ NO(~ 65%). Our results showed that AVOC emissions in 2006 from Zhang et al.(2009) have been underestimated by ~ 68% in suburban areas and by > 68%in urban areas, implying that daily and hourly concentrations of secondary organic aerosols and inorganic aerosols could be substantially underestimated, and cloud condensation nuclei could be underestimated, whereas local and regional radiation was overestimated. | WANG Feng AN Junling LI Ying TANG Yujia LIN Jian QU Yu CHEN Yong ZHANG Bing ZHAI Jing | 2014 | Advances in Atmospheric Sciences2014，31，6： | 5 |
| 8 | Observation of Wind Shear during Evening Transition and an Estimation of Submicron Aerosol Concentrations in Beijing Using a Doppler Wind Lidar显示文摘The wind speed and direction measured over six months by a Doppler wind lidar(Windcube-8)were compared with wind cup anemometers mounted on the 325-m Beijing meteorological tower(BMT).Five mountain–plain wind cases characterized by wind direction shear were selected based on the high-frequency(1.1 s)wind profile of the Windcube-8 and analyzed with 1-h mesoscale surface weather charts.Also analyzed was the relationship between insitu PM_1(aerodynamic diameter≤1μm)concentrations measured at 260 m on BMT and the carrier-to-noise ratio(CNR)of the co-located Windcube-8.The results showed that the 10-min averaged wind speed and direction were highly correlated(R=0.96–0.99)at three matched levels(80,140,and 200 m).The evening transition duration was1–3 h,with an average wind speed of 1 m s^(–1) at 80 m above the ground.In addition,there was a zero horizontalwind-speed zone along the wind direction shear line,and in one case,the wind speed was characterized by a Kelvin–Helmholtz gravity wave.The variability of the PM_1 concentrations was captured by the CNR of the Windcube-8 in a fair weather period without the long-range transport of dust. | Yong CHEN Junling AN Xiquan WANG Yele SUN Zifa WANG Jing DUAN | 2017 | Journal of Meteorological Research2017，31，2： | 5 |
| 9 | Synergistic impacts of anthropogenic and biogenic emissions on summer surface O_3 in East Asia显示文摘A factor separation technique and an improved regional air quality model (RAQM) were applied to calculate synergistic contributions of anthropogenic volatile organic compounds (AVOCs),biogenic volatile organic compounds (BVOCs) and nitrogen oxides (NOx) to daily maximum surface O3(O3DM) concentrations in East Asia in summer (June to August 2000).The summer averaged synergistic impacts of AVOCs and NOx are dominant in most areas of North China,with a maximum of 60 ppbv,while those of BVOCs and NOx are notable only in some limited areas with high BVOC emissions in South China,with a maximum of 25 ppbv.This result implies that BVOCs contribute much less to summer averaged O3DM concentrations than AVOCs in most areas of East Asia at a coarse spatial resolution (1×1) although global emissions of BVOCs are much greater than those of AVOCs.Daily maximum total contributions of BVOCs can approach 20 ppbv in North China,but they can reach 40 ppbv in South China,approaching or exceeding those in some developed countries in Europe and North America.BVOC emissions in such special areas should be considered when O3 control measures are taken.Synergistic contributions among AVOCs,BVOCs and NOx significantly enhance O3 concentrations in the Beijing-Tianjin-Tangshan region and decrease them in some areas in South China.Thus,the total contributions of BVOCs to O3DM vary significantly from day to day and from location to location.This result suggests that O3 control measures obtained from episodic studies could be limited for long-term applications. | Yu Qu Junling An Jian Li | 2013 | Journal of Environmental Sciences2013，25，3： | 4 |
| 10 | Effect of potential HONO sources on peroxyacetyl nitrate(PAN)formation in eastern China in winter显示文摘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. | Jingwei Zhang Yitian Guo 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 | 2020 | Journal of Environmental Sciences2020，32，8： | 3 |
| 11 | Aerosol optical properties under different pollution levels in the Pearl River Delta(PRD) region of China显示文摘To clarify the aerosol hygroscopic growth and optical properties of the Pearl River Delta(PRD)region,integrated observations were conducted in Heshan City of Guangdong Province from October 19 to November 17,2014.The concentrations and chemical compositions of PM2.5,aerosol optical properties and meteorological parameters were measured.The mean value of PM2.5 increased from less than 35(excellent)to 35-75μg/m^3(good)and then to greater than 75μg/m^3(pollution),corresponding to mean PM2.5 values of 24.9,51.2,and 93.3μg/m^3,respectively.The aerosol scattering hygroscopic growth factor(f(RH=80%))values were 2.0,2.12,and 2.18 for the excellent,good,and pollution levels,respectively.The atmospheric extinction coefficient(σext)and the absorption coefficient of aerosols(σap)increased,and the single scattering albedo(SSA)decreased from the excellent to the pollution levels.For different air mass sources,under excellent and good levels,the land air mass from northern Heshan had lower f(RH)andσsp values.In addition,the mixed aerosol from the sea and coastal cities had lower f(RH)and showed that the local sources of coastal cities have higher scattering characteristics in pollution periods. | Liuwei Kong Min Hu Qinwen Tan Miao Feng Yu Qu Junling An Yuanhang Zhang Xingang Liu Nianliang Cheng | 2020 | Journal of Environmental Sciences2020，32，1： | 3 |
| 12 | Effects of Additional HONO Sources on Visibility over the North China Plain显示文摘The objective of the present study was to better understand the impacts of the additional sources of nitrous acid(HONO)on visibility, which is an aspect not considered in current air quality models. Simulations of HONO contributions to visibility over the North China Plain(NCP) during August 2007 using the fully coupled Weather Research and Forecasting/Chemistry(WRF/Chem) model were performed, including three additional HONO sources:(1) the reaction of photo-excited nitrogen dioxide(NO*2) with water vapor;(2) the NO2 heterogeneous reaction on aerosol surfaces; and(3) HONO emissions. The model generally reproduced the spatial patterns and diurnal variations of visibility over the NCP well. When the additional HONO sources were included in the simulations, the visibility was occasionally decreased by 20%–30%(3–4 km) in local urban areas of the NCP. Monthly-mean concentrations of NO-3, NH+4, SO2-4and PM2.5were increased by 20%–52%(3–11μg m-3), 10%–38%, 6%–10%, and 6%–11%(9–17 μg m-3), respectively; and in urban areas, monthly-mean accumulationmode number concentrations(AMNC) and surface concentrations of aerosols were enhanced by 15%–20% and 10%–20%,respectively. Overall, the results suggest that increases in concentrations of PM2.5, its hydrophilic components, and AMNC,are key factors for visibility degradation. A proposed conceptual model for the impacts of additional HONO sources on visibility also suggests that visibility estimation should consider the heterogeneous reaction on aerosol surfaces and the enhanced atmospheric oxidation capacity due to additional HONO sources, especially in areas with high mass concentrations of NOxand aerosols. | LI Ying AN Junling Ismail GULTEPE | 2014 | Advances in Atmospheric Sciences2014，31，5： | 3 |
| 13 | Nocturnal Low-levelWinds and Their Impacts on Particulate Matter over the Beijing Area显示文摘Three-month wind profiles, 260 m PM_1 concentrations [i.e., particulate matter(PM) with an aerodynamic diameter ≤1μm], and carrier-to-noise ratio data at two Beijing sites 55 km apart(urban and suburban) were collected to analyze the characteristics of low-level nocturnal wind and PM in autumn and winter. Three mountain-plain wind events with wind shear were selected for analysis. The measurements indicated that the maximum wind speeds of the northerly weak low-level jet(LLJ) below 320 m at the suburban site were weaker than those at the urban site, and the LLJ heights and depths at the suburban site were lower than those at the urban site. The nocturnal 140 m mean vertical velocities and the variations in vertical velocity at the urban site were larger than those at the suburban site. A nocturnal breeze with a weak LLJ of ~3 m s^(-1) noticeably offset nocturnal PM transport due to southerly flow and convergence within the northern urban area of Beijing. Characteristics of the nocturnal LLJ, such as start-up time, structure, intensity, and duration, were important factors in determining the decrease in the nocturnal horizontal range and site-based low-level variations in PM. | Yong CHEN Junling AN Yele SUN Xiquan WANG Yu QU Jingwei ZHANG Zifa WANG Jing DUAN | 2018 | Advances in Atmospheric Sciences2018，35，12： | 2 |
| 14 | Insights into the phenomenon of an explosive growth and sharp decline in haze:A case study in Beijing显示文摘A severe haze episode occurred in winter in the North China Plain(NCP),and the phenomenon of an explosive growth and sharp decline in PM2.5(particulate matter with an aerodynamic diameter equal to or less than 2.5μm)concentration was observed.To study the systematic causes for this phenomenon,comprehensive observations were conducted in Beijing from November 26 to December 2,2015;during this period,meteorological parameters,LIDAR data,and the chemical compositions of aerosols were determined.The haze episode was characterized by rapidly varying PM2.5 concentration,and the highest PM2.5 concentration reached 667μg/m3.During the haze episode,the NCP was dominated by a weak high-pressure system and continuously low PBL(planetary boundary layer)heights,which are unfavorable conditions for the diffusion of pollutants.The large increases in the concentrations of SNA(SO42-,NO3-and NH4+)during the haze implied that the formation of SNA was the largest contribution.Water vapor also played a vital role in the formation of haze by promoting the chemical transformation of secondary pollutants,which led to higher PM2.5 concentrations.The spatial distributions of PM2.5 in Beijing at different times and the backward trajectories of the air masses also indicated that pollutants from surrounding provinces in particular,contributed to the higher PM2.5concentration. | Wenguang Li Xingang Liu Yuanhang Zhang Qinwen Tan Miao Feng Mengdi Song Lirong Hui Yu Qu Junling An Haokai Gao | 2019 | Journal of Environmental Sciences2019，31，10： | 1 |
| 15 | Impacts of HONO sources on the air quality in Beijing, Tianjin and Hebei Province of China 显示文摘 | Ying Li Junling An Min Min etal | 2011 | Atmospheric Environment2011，，45： | 1 |
| 16 | Long-Term Soil Acidification Model (LTSAM) Development and Application for Analyzing Soil Responses to Acidic Deposition显示文摘 | Junling An Meiyuan Huang | 1999 | Water Air and Soil Pollution (-)1999，，3： | 1 |
| 17 | A sup- ported gold catalyst for the elimination of hydrogen from CO2 feed gas in the production of urea显示文摘 | Zhengping Hao Lidun An Junling Zhou | 1996 | Reaction Kinetics and Catalysis Letters1996，59，： | 1 |
| 18 | Simulations of monthly mean nitrate concentrations in precipitation over East Asia显示文摘 | AN Junling UEDA H WANG Zifa | 2002 | Atmospheric Environment2002，36，26： | 1 |
| 19 | ‘Aerosol optical properties under different pollution levels in the pearl river delta(PRD)region of China’J.Environ.Sci.87(2020)49–59显示文摘The authors regret | Liuwei Kong Min Hu Qinwen Tan Miao Feng Yu Qu Junling An Yuanhang Zhang Xingang Liu Nianliang Cheng | 2021 | Journal of Environmental Sciences2021，33，6： | 0 |
| 20 | Satellite estimates and subpixel variability of rainfall in a semi-arid grassland显示文摘卫星估雨精度的不确定性受到当地降雨类型和像元内降雨非均匀性影响,而结合这两个关键因素开展半干旱草原卫星估雨的研究有限.2009年夏,我们在中国锡林郭勒半干旱草原用多部微雨雷达和雨量计构建了9 km卫星像元降雨观测网,观测了像元内降雨非均匀性(空间变异系数CV),并评估了卫星估雨精度.结果表明:(1) CV值受像元内平均降雨量,降雨类型,降雨云面积及移向等影响,如高CV值的降雨过程大多为平均降雨量小,对流性降雨过程,降雨云边缘像元CV值较高;(2) TRMM 3B42V7卫星估雨产品适用性较好,CMORPH和PERSIANN次之,但TRMM3B42V7易在半干旱草原湖泊处高估降雨. | Yong Chen Jing Duan Junling An Huizhi Liu Ulrich Görsdorf Franz HBerger | 2021 | Atmospheric and Oceanic Science Letters2021，14，5： | 0 |
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