Publications (7)0 Total impact
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Article: [Characteristics of atmospheric pollutants in Cangzhou].
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ABSTRACT: The variation characteristics of air pollution in Cangzhou are analyzed base on measurements from July 2009 to July 2011 in Cangzhou Normal College. Measurement data of NO(x) (NO(x) = NO + NO2), O3, SO2 and PM10 was used to analyze diurnal, monthly variation and annual variation characteristics of air pollutants in Cangzhou city. The results indicated that there were two peak values in the diurnal variation of NO, and PM10, and there was a single peak in the diurnal variation of O3. The diurnal variation of SO2 was similar to those of NO(x) and PM10, however, the variation trend was smoother than those of other pollutants. The seasonal variations of NO, NO2, NO(x) were the same as that of SO2, with the maximum values of these pollutants appearing in Winter, and the concentrations of NO, NO2, SO2 and PM10 were (30.0 +/- 18.9) microg x m(-3), (50.5 +/- 19.8) microg x m(-3), (80.5 +/- 38.7) microg x m(-3), (62.1 +/- 34.7) microg x m(-3) and (201.6 +/- 98.5) microg x m(-3), respectively. The seasonal variation of O3 was different from those of other pollutants, and the maximum concentration appeared in summer with the value of (44.9 +/- 11.4) microg x m(-3). The annual mean values of NO, NO2, NO(x), O3, SO2 and PM10 were (18.9 +/- 14.5) microg x m(-3), (37.6 +/- 13.0) microg x m(-3), (56.5 +/- 27.5) microg x m(-3), (49.9 +/- 16.3) microg x m(-3), (31.6 +/- 19.5) microg x m(-3) and (156.7 +/- 79.1) microg x m(-3), respectively. The dominant pollutants differed in different seasons. NO(x) (NO(x) = NO + NO2), SO2 and PM10 were the most important pollutants in autumn and winter, while O3 was the main pollutant in summer.Huan jing ke xue= Huanjing kexue / [bian ji, Zhongguo ke xue yuan huan jing ke xue wei yuan hui "Huan jing ke xue" bian ji wei yuan hui.] 11/2012; 33(11):3705-11. -
Article: [Effects of synoptic type on surface ozone pollution in Beijing].
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ABSTRACT: Ozone (O), influenced by meteorological factors, is a primary gaseous photochemical pollutant during summer to fall in Beijing' s urban ambient. Continuous monitoring during July to September in 2008 was carried out at four sites in Beijing. Analyzed with synoptic type, the results show that the ratios of pre-low cylonic (mainly Mongolia cyclone) and pre-high anticylonic to total weather conditions are about 42% and 20%, illustrating the high-and low-ozone episodes, respectively. At the pre-low cylonic conditions, high temperature, low humidity, mountain and valley winds caused by local circulation induce average hourly maximum ozone concentration (volume fraction) up to 102.2 x 10(-9), negative correlated with atmospheric pressure with a slope of -3.4 x 10(-9) Pa(-1). The time of mountain wind changed to valley wind dominates the diurnal time of maximum ozone, generally around 14:00. At the pre-high anticylonic conditions, low temperature, high humidity and systematic north wind induce average hourly maximum ozone concentration (volume fraction) only 49.3 x 10(-9), the diurnal time of maximum ozone is deferred by continuous north wind till about 16:00. The consistency of photochemical pollution in Beijing region shows that good correlation exists between synoptic type and ozone concentration. Therefore, getting an eye on the structure and evolution of synoptic type is of great significances for forecasting the photochemical pollution.Huan jing ke xue= Huanjing kexue / [bian ji, Zhongguo ke xue yuan huan jing ke xue wei yuan hui "Huan jing ke xue" bian ji wei yuan hui.] 03/2010; 31(3):573-8. -
Article: [Observation on atmospheric pollution in Xianghe during Beijing 2008 Olympic Games].
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ABSTRACT: There is a concern that much of the atmospheric pollution experienced in Beijing is regional in nature and not attributable to local sources. The objective of this study is to examine the contribution of sources outside Beijing to atmospheric pollution levels during Beijing 2008 Olympic Games. The observations of SO2, NO(x), O3, PM2.5 and PM10 were conducted from June 1 to September 30, 2008 in Xianghe, a rural site about 70 km southeast of Beijing. Sources and transportation of atmospheric pollution during the experiment were discussed with surface meteorology data and backward trajectories calculated using HYSPLIT model. The results showed that the daily average maximum (mean +/- standard deviation) concentrations of SO2, NO(x), O3, PM2.5, and PM10 during observation reached 84.4(13.4 +/- 15.2), 43.3 (15.9 +/- 9.1), 230 (82 +/- 38), 184 (76 +/- 42) and 248 (113 +/- 52) microg x m(-3), respectively. In particular, during the pollution episodes from July 20 to August 12, the hourly average concentration of O3 exceeded the National Ambient Air Quality Standard II for 46 h (9%), and the daily average concentration of PM10 exceeded the Standard for 11 d (46%); PM2.5 exceeded the US EPA Standard for 18 d (75%). The daily average concentrations of SO2, NO(x), O3, PM2.5 and PM10 decreased from 27.7, 18.6, 96, 90, 127 microg x m(-3) in June-July to 5.8, 13.2, 80, 60, 106 microg x m(-3) during Olympic Games (August-September), respectively. The typical diurnal variations of NO(x), PM2.5 and PM10 were similar, peaking at 07:00 and 20:00, while the maximum of O3 occurred between 14:00 to 16:00 local time. The findings also suggested that the atmospheric pollution in Xianghe is related to local emission, regional transport as well as the meteorological conditions. Northerly wind and precipitation are favorable for diffusion and wet deposition of pollutants, while sustained south flows make the atmospheric pollution more serious. The lead-lag correlation analysis during the pollution episodes from July 20 to August 12 showed that there are about 6-10 h (0.57 < r < 0.65, p = 0.01) of hourly average PM2.5 in Beijing lagging Xianghe, reaching the maximum at 8 h, which indicates that the real-time atmospheric PM2.5 database of Xianghe might provides early warning for the Beijing PM2.5 pollution events.Huan jing ke xue= Huanjing kexue / [bian ji, Zhongguo ke xue yuan huan jing ke xue wei yuan hui "Huan jing ke xue" bian ji wei yuan hui.] 01/2010; 31(1):1-9. -
Article: [On-line analysis and mass concentration characters of the alkali metal ions of PM10 in Beijing].
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ABSTRACT: The mass concentration characters and the sources of water-soluble alkali metal ions in PM10 in 2004 and 2005 in Beijing were analyzed by using the system of rapid collection of particles. The result showed that the average concentration of Na+, K+, Mg2+ and Ca2+ was 0.5-1.4, 0.5-2.5, 0.1-0.5 and 0.6-5.8 microg/m3, respectively. The highest and lowest concentration appeared in different seasons for the alkali metal ions, which was related to the quality and source. The concentration of alkali metal ions was no difference between the heating period and no heating period, which meant the heating was not the main source. Sea salt and soil were the important sources of Na+. The source of K+ came from biomass burning and vegetation. Soil was the large source of Mg2+ and Ca2+. The alkali metal ions appeared different daily variation in different seasons. Precipitation could decrease the concentration of Na+, K+, Mg2+ and Ca2+, which was 10%-70%, 20%-80%, 10%-77%, 5%-80% respectively.Huan jing ke xue= Huanjing kexue / [bian ji, Zhongguo ke xue yuan huan jing ke xue wei yuan hui "Huan jing ke xue" bian ji wei yuan hui.] 02/2008; 29(1):246-52. -
Article: [Water-soluble chloride in aerosol PM10 in Beijing].
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ABSTRACT: Water-soluble chloride is one of the most important components in aerosols. The chloride in PM10 measured from January to December 2004 in Beijing was determined using a system by combing rapid collection of fine particles and ion chromatography (RCFP-IC). The results showed that the annual average concentration of water-soluble chloride at the urban area in Beijing was about (3.1 +/- 1.7) microg x m(-3); the average concentration of chloride during the heating period was (4.6 +/- 2.1) microg m(-3) while it was (2.6 +/- 1.6) microg x m(-3) during the period no heating. The lowest concentration of (1.3 +/- 0.8) microg x m(-3) appeared in May, and the highest concentration appeared of (5.8 +/- 5.3) microg x m(-3) in December. Trends of the diurnal variation of water-soluble chloride depended on seasons. In autumn and winter, the higher concentration appeared in the daytime and the lower concentration appeared at night. In spring and summer, the higher concentration appeared at forenoon and the lower appeared at afternoon. Overall, the concentration of chloride in autumn and winter was higher than in spring and summer.Huan jing ke xue= Huanjing kexue / [bian ji, Zhongguo ke xue yuan huan jing ke xue wei yuan hui "Huan jing ke xue" bian ji wei yuan hui.] 06/2006; 27(5):825-30. -
Article: [Measurement on the atmospheric CO concentration in Beijing].
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ABSTRACT: Carbon monoxide is considered as a criteria pollutant in urban areas, and plays an important role in photochemistry of regional and urban environments. Continuous measurement of CO at the meteorological observation tower in IAP-CAS (39 degrees 9'N, 116 degrees 4'E) from January to December 2004 was carried out in Beijing, using HP5890II gas chromatography (GC) with flame ionization detector(FID), at measurement frequency of 10 minutes. The diurnal variations of the atmospheric CO concentration at the urban area in Beijing show a very clear cycle with two peaks, one appears about 07:00 to approximately 08:00 in the morning and the other is at 22:00 to approximately 23:00 in the evening, with the maximum of 13.8mg x m(-3), 17.1 mg x m(-3), respectively. However, diurnal variations in four seasons are not very same. The variation range is bigger in winter and autumn seasons than that in summer and spring seasons. The concentration in fall and winter seasons dropped more quickly than that in spring and summer seasons after 07:00 to approximately 08:00. CO concentration diurnal variations are believed to be due to the combination results of surface emission sources and meteorological factors. The results indicate that there is an obviously seasonal cycle of CO concentration, with the maximum in Dec (4.0 +/- 3.4)mg x m(-3) and minimum in May (1.7 +/- 0.7)mg x m(-3). The average concentration of CO during the whole year is (2.6 +/- 1.9) mg x m(-3). The average concentration of CO during the heating period is (3.5 +/- 2.6)mg x m(-3), and (2.2 +/- 1.2) mg x m(-3) during the period without heating.Huan jing ke xue= Huanjing kexue / [bian ji, Zhongguo ke xue yuan huan jing ke xue wei yuan hui "Huan jing ke xue" bian ji wei yuan hui.] 03/2006; 27(2):200-6. -
Article: [Analysis on chemical and physical properties of Beijing super dust storm in spring of 2004].
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ABSTRACT: On March 27, 2004 a super dust storm occurred in Beijing. The concentration of the aerosol and the element concentration of the aerosol were analyzed. The velocity of wind and radiation of ground were also measured. TSP increased 300 - 400 percent. PM2.5 increased 200 - 300 percent, but the concentration of the fine particle decreased. The elements like Na, Mg, Al, Mn and Fe mainly distribute in coarse particles. The contaminated elements such as Zn and Pb mainly distribute in fine particles. The contaminated elements mainly come from local source. The total radiation reduced 37.8 percent. With the increased of the velocity of the wind, the concentration of the coarse particle increased notability, the concentration of the fine particle decreased.Huan jing ke xue= Huanjing kexue / [bian ji, Zhongguo ke xue yuan huan jing ke xue wei yuan hui "Huan jing ke xue" bian ji wei yuan hui.] 10/2005; 26(5):1-6.
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Institutions
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2005
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Chinese Academy of Sciences
- Institute of Atmospheric Physics
Beijing, Beijing Shi, China
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