Characteristics of gaseous pollutants at Gucheng, a rural site southwest of Beijing

Lin, Weili; Xu, Xiaobin; Ge, Baozhu; Zhang, Xiaochun

doi:10.1029/2008jd010339

Cited by 81 publications

(93 citation statements)

References 42 publications

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“…Therefore, in winter Beijing, wind speed is the main factor indirectly causing the negative correlation of RH with O 3 and the postive correlation of RH with other pollutants. The similar phenomenon is also reported in other papers (e.g., An et al, 2007An et al, , 2008Li et al, 2007;Lin et al, 2009). In winter when the photochemical transformation becomes much weaker, the variations of the primary pollutants are driven mainly by emission and mixing processes.…”

Section: Concentration Ratios and Implications To Emission Sourcessupporting

confidence: 69%

Gaseous pollutants in Beijing urban area during the heating period 2007–2008: variability, sources, meteorological, and chemical impacts

Lin

et al. 2011

Atmos. Chem. Phys.

122

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Abstract. Gaseous pollutants, NO y /NO x , SO 2 , CO, and O 3 , were measured at an urban site in Beijing from 17 November 2007 to 15 March 2008. The average concentrations (with ± 1σ ) of NO, NO 2 , NO x , NO y , CO, SO 2 , and O 3 were 29.0 ± 2.7 ppb, 33.7 ± 1.4 ppb, 62.7 ± 4.0 ppb, 72.8 ± 4.5 ppb, 1.99 ± 0.13 ppm, 31.9 ± 2.0 ppb, and 11.9 ± 0.8 ppb, respectively, with hourly maxima of 200.7 ppb, 113.5 ppb, 303.9 ppb, 323.2 ppb, 15.06 ppm, 147.3 ppb, and 69.7 ppb, respectively. The concentrations of the pollutants show "saw-toothed" patterns, which are attributable mainly to changes in wind direction and speed. The frequency distributions of the hourly mean concentrations of NO y , SO 2 , CO, and O 3 can all be decomposed in the two Lorentz curves, with their peak concentrations representing background levels under different conditions. During the observation period, the average ratio NO x /NO y was 0.86 ± 0.10, suggesting that the gaseous pollutants in Beijing in winter are mainly from local emissions. Data of O 3 , NO z , and NO x /NO y indicate that photochemistry can take place in Beijing even in the cold winter period. Based on the measurements of O 3 , NO x , and NO y , ozone production efficiency (OPE) is estimated to be in the range of 0-8.9 (ppb ppb −1 ) with the mean(±1σ ) and median values being 1.1(±1.6) and 0.5 (ppb ppb −1 ), respectively, for the winter 2007-2008 in Beijing. This low OPE would cause a photochemical O 3 source of 5 ppb day −1 , which is small but significant for surface O 3 in winter in Beijing.Correspondence to: X. Xu (xuxb@cams.cma.gov.cn) Downward transport of O 3 -rich air from the free troposphere is the more important factor for the enhancement of the O 3 level in the surface layer, while high NO level for the destruction of O 3 . The concentrations of SO 2 , CO, and NO x are strongly correlated among each other, indicating that they are emitted by some common sources. Multiple linear regression analysis is applied to the concentrations of NO y , SO 2 , and CO and empirical equations are obtained for the NO y concentration. Based the equations, the relative contributions from mobile and point sources to NO y is estimated to be 66 ± 30 % and 40 ± 16 %, respectively, suggesting that even in the heating period, mobile sources in Beijing contribute more to NO y than point sources.

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Section: Concentration Ratios and Implications To Emission Sourcessupporting

confidence: 69%

Gaseous pollutants in Beijing urban area during the heating period 2007–2008: variability, sources, meteorological, and chemical impacts

Lin

et al. 2011

Atmos. Chem. Phys.

122

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“…Ozone exhibits a distinguished seasonal variation, with a broad peak in late spring and middle summer (a maximum in May and a secondary maximum in July) and a minimum in winter (November to January). Its observed behavior at NRCS is different from what has been disclosed in previous studies conducted in southern and northern China, such as a summer minimum and an autumn maximum of O 3 found in Hong Kong and an early summer (June) broad maximum recorded in Beijing (Ding et al, 2008;Lin et al, 2008Lin et al, , 2009Xue et al, 2014b;Sun et al, 2016). Recently, Ding et al (2013) presented two peaks of O 3 appearing in summer (July) and early autumn (September) at the Xianlin site in the suburban area Qi et al (2015).…”

Section: Seasonal Characteristicscontrasting

confidence: 46%

“…3.2. Such a circumstance was also observed at the rural site of Gucheng in the North China Plain (NCP) and in the urban area of Beijing (Lin et al, 2009(Lin et al, , 2011. Taking the average of SOPE of 1.99 and the average daytime increment of NO z (ca.…”

Section: Dependences Of Pollutant Concentrations On Local Emission Anmentioning

confidence: 99%

“…2b and e) show that these precursors were still at fairly high levels (about 500 and 35 ppbv, respectively) in summer. The low O 3 level in winter, especially at night, can be attributed to the lower temperature, weaker solar radiation, and in particular the strong destruction of O 3 by chemical titration of NO from local emissions or regional transport as discussed below (Lin et al, 2008(Lin et al, , 2009(Lin et al, , 2011. Note that a slight drop of O 3 was found in June compared with other months in summer, mainly attributed to the more frequent rainy days (23 days) and larger rainfall in June (346 mm) than those in May (15 days) and July (5 days) during summertime (Table 1).…”

Section: Seasonal Characteristicsmentioning

confidence: 99%

“…Photochemical age is often used to express the extent of photochemistry, which can be estimated using an indicator such as NO x / NO y (Carpenter et al, 2000;Lin et al, 2008Lin et al, , 2009Lin et al, , 2011Parrish et al, 1992). Air masses with fresh emissions have an NO x / NO y ratio close to 1, while there is a lower NO x / NO y ratio for the photochemical aged air masses.…”

Section: Dependences Of Pollutant Concentrations On Local Emission Anmentioning

confidence: 99%

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Characterization of atmospheric trace gases and particulate matter in Hangzhou, China

Zhang

et al. 2018

Atmos. Chem. Phys.

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Abstract. The Yangtze River Delta (YRD) is one of the most densely populated regions in China with severe air quality issues that have not been fully understood. Thus, in this study, based on 1-year (2013) continuous measurement at a National Reference Climatological Station (NRCS, 30.22 • N, 120.17 • E; 41.7 m a.s.l.) in the center of Hangzhou in the YRD, we investigated the seasonal characteristics, interspecies relationships, and the local emissions and the regional potential source contributions of trace gases (including O 3 , NO x , NO y , SO 2 , and CO) and particulate matter (PM 2.5 and PM 10 ). Results revealed that severe two-tier air pollution (photochemical and haze pollution) occurred in this region, with frequent exceedances in O 3 (38 days) and PM 2.5 (62 days). O 3 and PM 2.5 both exhibited distinct seasonal variations with reversed patterns: O 3 reaching a maximum in warm seasons (May and July) but PM 2.5 reaching a maximum in cold seasons (November to January). The overall results from interspecies correlation indicated a strong local photochemistry favoring the O 3 production under a volatile organic compound (VOC)-limited regime, whereas it moved towards an optimum O 3 production zone during warm seasons, accompanied by the formation of secondary fine particulates under high O 3 . The emission maps of PM 2.5 , CO, NO x , and SO 2 demonstrated that local emissions were significant for these species on a seasonal scale. The contributions from the regional transport among inland cities (Zhejiang, Jiangsu, Anhui, and Jiangxi Province) on a seasonal scale were further confirmed to be crucial to air pollution at the NRCS site by using backward trajectory simulations. Air masses transported from the offshore areas of the Yellow Sea, East Sea, and South Sea were also found to be highly relevant to the elevated O 3 at the NRCS site through the analysis of potential source contribution function (PSCF). Case studies of photochemical pollution (O 3 ) and haze (PM 2.5 ) episodes both suggested the combined importance of local atmospheric photochemistry and synoptic conditions during the accumulation (related with anticyclones) and dilution process (related with cyclones). Apart from supplementing a general picture of the air pollution state in the city of Hangzhou in the YRD region, this study specifically elucidates the role of local emission and regional transport, and it interprets the physical and photochemical processes during haze and photochemical pollution episodes. Moreover, this work suggests that cross-regional control measures are crucial to improve air quality in the YRD region, and it further emphasizes the importance of local thermally induced circulation for air quality.

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Analysis on temporal variation law of ozone pollution and meteorological driving factors in Pudong New Area of Shanghai

Guan

Geng

Yang³

et al. 2023

Env Prog and Sustain Energy

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In order to deeply understand the influence of meteorological drivers on ozone (O3) pollution during the high season and explore O3 pollution control options, we analyzed the temporal variation characteristics of O3 pollution based on the ambient air observation data of Pudong New Area, Shanghai from 2020 to 2021, studied the influence of meteorological drivers on O3 pollution, and explored seasonal emission reduction options based on the results of EKMA (Empirical Kinetics Modeling Approach) curves. The results show that the seasonal O3 concentration variation is spring > summer > autumn > winter; relative humidity, temperature and wind speed are the main meteorological drivers of O3 pollution; the cross‐regional transport of high O3 concentrations and precursors from the south and southwest has a strong influence on the local O3 concentration; Pudong New Area is in the “VOCs control zone” during the O3 pollution period in May. Therefore, it is important to control the production and emission of local VOCs and to strengthen the synergistic control of O3 and its precursors between regions for the control of spring O3 in Pudong New Area.

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Characteristics of gaseous pollutants at Gucheng, a rural site southwest of Beijing

Cited by 81 publications

References 42 publications

Gaseous pollutants in Beijing urban area during the heating period 2007–2008: variability, sources, meteorological, and chemical impacts

Gaseous pollutants in Beijing urban area during the heating period 2007–2008: variability, sources, meteorological, and chemical impacts

Characterization of atmospheric trace gases and particulate matter in Hangzhou, China

Analysis on temporal variation law of ozone pollution and meteorological driving factors in Pudong New Area of Shanghai

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