Characteristics of pollutants and their correlation to meteorological conditions at a suburban site in the North China Plain

Xu, Wanyun; Zhao, Chunsheng; Ran, Liang; Deng, Zhaoze; Liu, P. F.; Ma, Nan; Lin, Weili; Xu, Xiangde; Yan, Peng; He, Xiaobo; Yu, Junsheng; Liang, Weiqing; Chen, L. L.

doi:10.5194/acp-11-4353-2011

Cited by 231 publications

(153 citation statements)

References 48 publications

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“…They compared the characteristics of dispersion and transport during pre-episode and episode days. Xu et al (2011) confirmed the deterministic impact of wind speed and wind direction on the concentration of various trace gases at a suburban site between two mega-cities. Csavina et al (2014) examined dust events in two semi-arid sites and then showed a complex, nonlinear dependence of PM 10 (particulate matter with aerodynamic diameters ≤ 10 µm) on wind speed and relative humidity.…”

Section: Y Zheng Et Al: Impact Of Atmospheric Circulations On Aementioning

confidence: 53%

“…ern China, and the degree of air pollution in the region is largely subject to large-scale atmospheric conditions (Xu et al, 2011). In some other regions, strong links between the concentration of aerosols and certain synoptic weather condition have already been identified (Demuzere et al, 2009;Saavedra et al, 2012).…”

Section: Y Zheng Et Al: Impact Of Atmospheric Circulations On Aementioning

confidence: 99%

“…To understand the mechanisms that control spatiotemporal distribution of aerosols, extensive investigations have been carried out to study the relationship between air quality and multiple factors. Among the multifaceted problems related to air pollution, favourable weather conditions are a factor that should not be ignored Xu et al, 2011). In general, although the characteristics of regional air quality depend on many complex elements, the major contributors are the emission of the pollutants and favourable largescale meteorological conditions (Z. H. ; X. L. .…”

Section: Introductionmentioning

confidence: 99%

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Impact of atmospheric circulations on aerosol distributions in autumn over eastern China: observational evidence

Zheng

Yang

et al. 2015

Atmos. Chem. Phys.

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Abstract. Regional heavy pollution events in eastern China (110-122 • E, 28-40 • N) are causing serious environmental problems. In this study, the relationship between the degree of regional pollution and the patterns of large-scale atmospheric circulation over eastern China in October is investigated using 10-year (2001-2010) Terra/MODIS aerosol optical depth and NCEP reanalysis data by both case study and composite analysis. Eighteen polluted and 10 clean episodes are selected and categorised into six polluted types and three clean types respectively. Generally speaking, weather patterns such as a uniform surface pressure field in eastern China or a steady straight westerly in the middle troposphere, particularly when being at the rear of the anticyclone at 850 hPa, are typically responsible for heavy pollution events. Meanwhile, clean episodes occur when strong southeastward cold air advection prevails below the middle troposphere or air masses are transported from sea to land. Uniform descending motion prevails over the study region, trapping pollutants in the lower atmosphere. Therefore, the value of vertical velocity averaged from 1000 to 100 hPa and divergence of wind field in the lower troposphere are used in this study to quantify the diffusion conditions in each circulation type. The results reveal that it is often a clean episode when both the mean downward motion (larger than 2.56 × 10 −2 Pa s −1 ) and the divergence of lowlevel winds (larger than 1.79 × 10 −2 s −1 ) are strong. Otherwise, it is more likely to be a polluted episode.

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Section: Y Zheng Et Al: Impact Of Atmospheric Circulations On Aementioning

confidence: 53%

Section: Y Zheng Et Al: Impact Of Atmospheric Circulations On Aementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impact of atmospheric circulations on aerosol distributions in autumn over eastern China: observational evidence

Zheng

Yang

et al. 2015

Atmos. Chem. Phys.

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“…For chemical reactions and transformations, temperature, solar radiation, and humidity are the most crucial factors [24,25]. However, no clear linear relationships can be found between meteorological parameters (i.e., wind speed, ultraviolet radiation, or temperature) and the concentration of pollutants [26,27]. Furthermore, due to topographical differences, the key meteorological parameters that may affect the haze process are distinct in different regions.…”

Section: Introductionmentioning

confidence: 94%

The Effect of Meteorological Elements on Continuing Heavy Air Pollution: A Case Study in the Chengdu Area during the 2014 Spring Festival

Zeng

2017

Atmosphere

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Meteorological conditions significantly influence air pollution. The Chengdu plain, with few external pollution sources and homogeneous meteorological conditions, is a natural lab to study the effects of meteorological elements on the diffusion and dissipation of pollutants. Large-scale and long-duration haze events occurred all over China during the Spring Festival in 2014. This study tries to detect the characteristics and the formation mechanisms of this haze event in the Chengdu area using air quality and the meteorological monitoring of this event. The results showed that, when considering the concentration changes of the primary pollutant, this haze event could be divided into three stages: Stage 1, the concentration of all pollutions increased; Stage 2, the concentration of gaseous pollutants decreased, while that of particulate matter increased; Stage 3, the concentration of all pollutants decreased. Adverse atmospheric circulation, unfavorable meteorological conditions (lower air temperature and wind speed, higher air pressure and relative humidity), a frequently occurring inversion layer (with a strong intensity and lower bottom), and the low height of the mixing layer resulted in this haze. This study suggests that not only surface meteorological factors, but also the boundary layer structure, played an important role in the vertical diffusion of the pollutants.

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“…However, urban area only takes up approximately 5% area in China while cropland is the dominant surface type also featuring dense population and high PM2.5 exposure (Liu, 2005;Xu et al, 2011). Frequent regional-scale haze pollution and cropland-dominant land cover in China make 15 it necessary to figure out this interaction over rural area Zhao et al, 2013b).…”

Section: A Comparison Of the Dome Effect Over Urban And Rural Areasmentioning

confidence: 99%

Dome effect of black carbon and its key influencing factors: A one-dimensional modelling study

Wang¹,

Huang²,

Ding³

2017

Preprint

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Black carbon (BC) has been identified to play a critical role in aerosol-planet boundary layer (PBL) interaction and further deterioration of near-surface air pollution in megacities, which has been named as its "dome effect". However, the impacts of key factors that influence this effect, such as the vertical distribution and aging processes of BC, and also the underlying land surface, have not been quantitatively explored yet. Here, based on available in-situ measurements of meteorology and 15 atmospheric aerosols together with the meteorology-chemistry online coupled model, WRF-Chem, we conduct a set of parallel simulations to quantify the roles of these factors in influencing the BC's dome effect and surface haze pollution, and discuss the main implications of the results to air pollution mitigation in China. We found that the impact of BC on PBL is very sensitive to the altitude of aerosol layer. The upper level BC, especially those near the capping inversion, is more essential in suppressing the PBL height and weakening the turbulence mixing. The dome effect of BC tends to be significantly intensified 20 as BC aerosol mixed with scattering aerosols during winter haze events, resulting in a decrease of PBL height by more than 25%. In addition, the dome effect is more substantial (up to 15%) in rural areas than that in the urban areas with the same BC loading, indicating an unexpected regional impact of such kind of effect to air quality in countryside. This study suggests that China's regional air pollution would greatly benefit from BC emission reductions, especially those from the elevated sources from the chimneys and also the domestic combustions in rural areas, through weakening the aerosol-boundary layer 25 interactions that triggered by BC.

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Characteristics of pollutants and their correlation to meteorological conditions at a suburban site in the North China Plain

Cited by 231 publications

References 48 publications

Impact of atmospheric circulations on aerosol distributions in autumn over eastern China: observational evidence

Impact of atmospheric circulations on aerosol distributions in autumn over eastern China: observational evidence

The Effect of Meteorological Elements on Continuing Heavy Air Pollution: A Case Study in the Chengdu Area during the 2014 Spring Festival

Dome effect of black carbon and its key influencing factors: A one-dimensional modelling study

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