Radiative Effects of Particular Matters on Ozone Pollution in Six North China Cities

2021 ◽  
Author(s):  
Shaomin Li ◽  
Rui Liu ◽  
Shuai Wang ◽  
Song Xi Chen
Keyword(s):  
North China ◽  
Ozone Pollution ◽  
Radiative Effects

scholarly journals Contributions of pollutants from North China Plain to surface ozone at the Shangdianzi GAW Station

2008 ◽  
Vol 8 (19) ◽  
pp. 5889-5898 ◽  
Author(s):  
W. Lin ◽  
X. Xu ◽  
X. Zhang ◽  
J. Tang
Keyword(s):  
North China Plain ◽  
North China ◽  
Surface Ozone ◽  
Surface Wind ◽  
Ozone Pollution ◽  
Ancillary Data ◽  
Ozone Concentrations ◽  
The North ◽  
The North China Plain ◽  
Autumn And Winter

Abstract. Regional ozone pollution has become one of the top environmental concerns in China, especially in those economically vibrant and densely populated regions, such as North China region including Beijing. To address this issue, surface ozone and ancillary data over the period 2004–2006 from the Shangdianzi Regional Background Station in north China were analyzed. Due to the suitable location and valley topography of the site, transport of pollutants from the North China Plain was easily observed and quantified according to surface wind directions. Regional (polluted) and background (clean) ozone concentrations were obtained by detailed statistic analysis. Contribution of pollutants from North China Plain to surface ozone at SDZ was estimated by comparing ozone concentrations observed under SW wind conditions and that under NE wind conditions. The average daily accumulated ozone contribution was estimated to be 240 ppb·hr. The average regional contributions to surface ozone at SDZ from the North China Plain were 21.8 ppb for the whole year, and 19.2, 28.9, 25.0, and 10.0 ppb for spring, summer, autumn, and winter, respectively. The strong ozone contribution in summer led to disappearance of the spring ozone maximum phenomenon at SDZ under winds other than from the NNW to E sectors. The emissions of nitrogen oxide in the North China plain cause a decrease in ozone concentrations in winter.

scholarly journals Daytime variation of aerosol optical depth in North China and its impact on aerosol direct radiative effects

2018 ◽  
Vol 182 ◽  
pp. 31-40 ◽  
Author(s):  
Jingjing Song ◽  
Xiangao Xia ◽  
Huizheng Che ◽  
Jun Wang ◽  
Xiaoling Zhang ◽  
...  
Keyword(s):  
Aerosol Optical Depth ◽  
Optical Depth ◽  
North China ◽  
Radiative Effects ◽  
Daytime Variation

scholarly journals A typical weather pattern for the ozone pollution events in North China

2019 ◽  
Author(s):  
Cheng Gong ◽  
Hong Liao
Keyword(s):  
North China ◽  
Transport Model ◽  
Lower Troposphere ◽  
Maximum Temperature ◽  
Daily Maximum Temperature ◽  
Daily Maximum ◽  
Ozone Pollution ◽  
Chemical Production ◽  
Weather Pattern ◽  
Pollution Events

Abstract. Ground-level observations, reanalyzed meteorological fields and a 3-D global chemical and transport model (GEOS-Chem) were applied in this study to investigate ozone (O3) pollution events (OPEs) in North China (36.5° N–40.5° N, 114.5° E–119.5° E) during 2014–2017. Ozone pollution days (OPDs) were defined as days with maximum daily averaged 8-h (MDA8) concentrations over North China larger than 160 μg m−3, and OPEs were defined as periods with 3 or more consecutive OPDs. Observations showed that there were 167 OPDs and 27 OPEs in North China during 2014–2017, in which 123 OPDs and 21 OPEs occurred in May–July. We found that OPEs in North China occurred under a typical weather pattern with high daily maximum temperature (Tmax), low relative humidity (RH), anomalous southerlies and divergence in the lower troposphere, an anomalous high-pressure system at 500 hPa and an anomalous downward air flow from 500 hPa to the surface. Under such a weather pattern, chemical production of O3 was high between 800 and 900 hPa, which was then transported downward to enhance O3 pollution at the surface. A standardized index I_OPE was defined by applying four key meteorological parameters, including Tmax, RH, meridional winds at 850 hPa (V850) and zonal winds at 500 hPa (U500). I_OPE can capture approximately 80 % of the observed OPDs and OPEs, which has implications for forecasting OPEs in North China.

scholarly journals Dominant patterns of summer ozone pollution in eastern China and associated atmospheric circulations

2019 ◽  
Vol 19 (22) ◽  
pp. 13933-13943 ◽  
Author(s):  
Zhicong Yin ◽  
Bufan Cao ◽  
Huijun Wang
Keyword(s):  
North China ◽  
Surface Ozone ◽  
Eastern China ◽  
Western Pacific Subtropical High ◽  
Ground Level ◽  
Photochemical Reactions ◽  
Western Pacific ◽  
Subtropical High ◽  
Ozone Pollution ◽  
Atmospheric Circulations

Abstract. Surface ozone has been severe during summers in the eastern parts of China, damaging human health and flora and fauna. During 2015–2018, ground-level ozone pollution increased and intensified from south to north. In North China and the Huanghuai region, the O3 concentrations were highest. Two dominant patterns of summer ozone pollution were determined, i.e., a south–north covariant pattern and a south–north differential pattern. The anomalous atmospheric circulations composited for the first pattern manifested as a zonally enhanced East Asian deep trough and as a western Pacific subtropical high, whose western ridge point shifted northward. The local hot, dry air and intense solar radiation enhanced the photochemical reactions to elevate the O3 pollution levels in North China and the Huanghuai region; however, the removal of pollutants was decreased. For the second pattern, the broad positive geopotential height anomalies at high latitudes significantly weakened cold air advection from the north, and those extending to North China resulted in locally high temperatures near the surface. In a different manner, the western Pacific subtropical high transported sufficient water vapor to the Yangtze River Delta and resulted in a locally adverse environment for the formation of surface ozone. In addition, the most dominant pattern in 2017 and 2018 was different from that in previous years, which is investigated as a new feature.

scholarly journals Substantial ozone enhancement over the North China Plain from increased biogenic emissions due to heat waves and land cover in summer 2017

2019 ◽  
Author(s):  
Mingchen Ma ◽  
Yang Gao ◽  
Yuhang Wang ◽  
Shaoqing Zhang ◽  
L. Ruby Leung ◽  
...  
Keyword(s):  
Land Cover ◽  
Land Cover Change ◽  
North China Plain ◽  
North China ◽  
Urban Landscape ◽  
Heat Waves ◽  
Biogenic Emissions ◽  
Ozone Pollution ◽  
The North ◽  
The North China Plain

Abstract. In the summer of 2017, heavy ozone pollution swamped most of the North China Plain (NCP), with the maximum regional average of daily maximum 8-h ozone concentration (MDA8) reaching almost 120 ppbv. In light of the continuing reduction of anthropogenic emissions in China, the underlying mechanisms for the occurrences of these regional extreme ozone episodes are elucidated from two perspectives: meteorology and biogenic emissions. The significant positive correlation between MDA8 and temperature, which is amplified during heat waves concomitant with stagnant air and no precipitation, supports the crucial role of meteorology in driving high ozone concentrations. We also find that biogenic emissions are enhanced due to factors previously not considered. During the heavy ozone pollution episodes in June 2017, biogenic emissions driven by high vapor pressure deficit (VPD), land cover change and urban landscape yield an extra mean MDA8 ozone of 3.08, 2.79 and 4.74 ppbv, respectively over the NCP, which together contribute as much to MDA8 ozone as biogenic emissions simulated using the land cover of 2003 and ignoring VPD and urban landscape. In Beijing, the biogenic emission increase due to urban landscape has a comparable effect on MDA8 ozone to the combined effect of high VPD and land cover change between 2003 and 2016. This study highlights the vital contributions of heat waves, land cover change and urbanization to the occurrence of extreme ozone episode, with significant implications for ozone pollution control in a future when heat wave frequency and intensity are projected to increase under global warming.

Cropland nitrogen dioxide emissions and effects on the ozone pollution in the North China plain

2021 ◽  
pp. 118617
Author(s):  
Ruonan Wang ◽  
Naifang Bei ◽  
Jiarui Wu ◽  
Xia Li ◽  
Suixin Liu ◽  
...  
Keyword(s):  
Nitrogen Dioxide ◽  
North China Plain ◽  
North China ◽  
Ozone Pollution ◽  
The North ◽  
The North China Plain

scholarly journals Contributions of pollutants from North China Plain to surface ozone at the Shangdianzi GAW station

2008 ◽  
Vol 8 (3) ◽  
pp. 9139-9165 ◽  
Author(s):  
W. Lin ◽  
X. Xu ◽  
X. Zhang ◽  
J. Tang
Keyword(s):  
North China Plain ◽  
North China ◽  
Surface Ozone ◽  
Surface Wind ◽  
Ozone Pollution ◽  
Ancillary Data ◽  
Ozone Concentrations ◽  
The North ◽  
The North China Plain ◽  
Autumn And Winter

Abstract. Regional ozone pollution has become one of the top environmental concerns in China, especially in those economically vibrant and densely populated regions, such as North China region including Beijing. To address this issue, surface ozone and ancillary data over the period 2004–2006 from the Shangdianzi Regional Background Station in north China were analyzed. Due to the suitable location and valley topography of the site, transport of pollutants from the North China Plain was easily observed and quantified according to surface wind directions. Regional (polluted) and natural (clean) background ozone concentrations were obtained by detailed statistic analysis. Contribution of pollutants from North China Plain to surface ozone at SDZ was estimated by comparing ozone concentrations observed under SW wind conditions and that under NE wind conditions. The average daily accumulated ozone contribution was estimated to be 240 ppb·hr. The average regional contributions to surface ozone at SDZ from the North China Plain were 21.8 ppb for the whole year, and 19.2, 28.9, 25.0, and 10.0 ppb for spring, summer, autumn, and winter, respectively. The strong ozone contribution in summer led to disappearance of the spring ozone maximum phenomenon at SDZ under winds other than from the WNN to E sectors. High winter NOx concentrations in the North China Plain caused negative ozone contribution in winter.

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