Continuous ground-based aerosol Lidar observation during seasonal pollution events at Wuxi, China

Wong, Man Sing; Qin, Kai; Lian, Hong; Campbell, James; Lee, Kwon-Ho; Sheng, Shijie

doi:10.1016/j.atmosenv.2017.01.051

Cited by 13 publications

(4 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The depolarization ratio is an indicator of the sphericity of aerosols. A low depolarization ratio indicates that aerosols are spherical (Burton et al, 2012;Wong et al, 2017). Lidar results show that depolarization ratios of over 70 % of measurements during the campaign are between 0.001 and 0.03 (see Fig.…”

Section: Aerosol Profile and Evolutionmentioning

confidence: 96%

Observations of the vertical distributions of summertime atmospheric pollutants and the corresponding ozone production in Shanghai, China

et al. 2017

View full text Add to dashboard Cite

Abstract. Ground-based multi-axis differential optical absorption spectroscopy (MAX-DOAS) and lidar measurements were performed in Shanghai, China, during May 2016 to investigate the vertical distribution of summertime atmospheric pollutants. In this study, vertical profiles of aerosol extinction coefficient, nitrogen dioxide (NO 2 ) and formaldehyde (HCHO) concentrations were retrieved from MAX-DOAS measurements using the Heidelberg Profile (HEIPRO) algorithm, while vertical distribution of ozone (O 3 ) was obtained from an ozone lidar. Sensitivity study of the MAX-DOAS aerosol profile retrieval shows that the a priori aerosol profile shape has significant influences on the aerosol profile retrieval. Aerosol profiles retrieved from MAX-DOAS measurements with Gaussian a priori profile demonstrate the best agreements with simultaneous lidar measurements and vehicle-based tethered-balloon observations among all a priori aerosol profiles. Tropospheric NO 2 vertical column densities (VCDs) measured with MAX-DOAS show a good agreement with OMI satellite observations with a Pearson correlation coefficient (R) of 0.95. In addition, measurements of the O 3 vertical distribution indicate that the ozone productions do not only occur at surface level but also at higher altitudes (about 1.1 km). Planetary boundary layer (PBL) height and horizontal and vertical wind field information were integrated to discuss the ozone formation at upper altitudes. The results reveal that enhanced ozone concentrations at ground level and upper altitudes are not directly related to horizontal and vertical transportation. Similar patterns of O 3 and HCHO vertical distributions were observed during this campaign, which implies that the ozone productions near the surface and at higher alPublished by Copernicus Publications on behalf of the European Geosciences Union.

show abstract

Section: Aerosol Profile and Evolutionmentioning

confidence: 96%

Observations of the vertical distributions of summertime atmospheric pollutants and the corresponding ozone production in Shanghai, China

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Enhanced surface O 3 concentrations were found over rural areas of Shanghai compared to the city center (Geng et al, 2008;Xing et al, 2011). This probably resulted from the sig-nificant contribution of anthropogenic emissions of NO in the city center, which consumes ambient ozone through NO titration (i.e., NO+O 3 → NO 2 +O 2 ).…”

Section: Ozone Vertical Distributionmentioning

confidence: 99%

Observations of the summertime atmospheric pollutants vertical distributions and the corresponding ozone production in Shanghai, China

Xing

Liu

Wang

et al. 2017

Preprint

View full text Add to dashboard Cite

Abstract. Ground based Multi-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS) and lidar measurements were performed in Shanghai, China during May 2016 to investigate the summertime atmospheric pollutants vertical distribution. In this study, vertical profiles of aerosol extinction coefficient, nitrogen dioxide (NO2) and formaldehyde (HCHO) concentrations were retrieved from MAX-DOAS measurement using the Heidelberg Profile (HeiPro) algorithm, while vertical distribution of ozone (O3) was obtained from an ozone lidar. Sensitivity study of the MAX-DOAS aerosol profile retrieval shows that the a priori aerosol profile shape has significant influences on the aerosol profile retrieval. Aerosol profiles retrieved from MAX-DOAS measurements with Gaussian a priori demonstrate the best agreements with simultaneous lidar measurements and vehicle-based tethered-balloon observations among all a priori aerosol profiles. MAX-DOAS measured tropospheric NO2Vertical Column Densities (VCDs) show a good agreement with OMI satellite observations with Pearson correlation coefficient (R) of 0.95. In addition, measurements of the O3 vertical distribution indicate that the ozone productions do not only occur at surface level but also at higher altitudes (about 1.1&#8201;km). Planetary boundary layer (PBL) height, horizontal and vertical wind fields information were integrated to discuss the ozone formation at upper altitudes. The results reveal that enhanced ozone concentrations at ground and upper altitudes are not directly related to horizontal and vertical transportations. Similar patterns of O3 and HCHO vertical distributions were observed during this campaign, which implies that the ozone productions near to the surface and at higher altitudes are mainly influenced by the abundance of volatile organic compounds (VOCs) in the lower troposphere.

show abstract

“…Vertical profiles of pollution are also highly dependent on local and regional meteorology. Significant variation in the depth, altitude, and composition of pollution layers has been observed across eastern Asia (e.g., Oltmans et al, 2004;Liu et al, 2011;Wong et al, 2017). Frontal boundaries are known for lifting pollution and dust particles from the boundary layer to the free troposphere (Bey et al, 2001;Liu et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Meteorology influencing springtime air quality, pollution transport, and visibility in Korea

Peterson¹,

Hyer²,

Han

et al. 2019

Elementa: Science of the Anthropocene

107

View full text Add to dashboard Cite

In an environment with many local, remote, persistent, and episodic sources of pollution, meteorology is the primary factor that drives periods of unhealthy air quality and reduced visibility. The 2016 Korea-UnitedStatesAirQuality(KORUS-AQ)fieldstudyprovidesauniqueopportunitytoexaminethe impactofmeteorologyontherelativeinfluenceoflocalandtransboundarypollution.MuchoftheKORUS-AQ campaign can be grouped into four distinct research periods based on observed synoptic meteorology, includingaperiodofcomplexaerosolverticalprofilesdrivenbydynamicmeteorology,stagnationundera persistent anticyclone, low-level transport and haze development, and a blocking pattern. These episodes areexaminedusingadiversearchiveofground,airborne,andsatellitedata.Whilefrontalboundaries are recognized as the primary mechanism driving pollution transport in eastern Asia, results show that they are not always related to sustained periods of hazardous air quality and reduced visibility at the surface.Significantlong-rangetransportofpollutionanddustwasconstrainedtoafewshortevents, suggesting that the majority of pollutants sampled during KORUS-AQ originated from local sources. A severeregionalpollutionepisodeisexaminedindetail,featuringdensehazeandsignificantsecondary particle formation within a shallow moist boundary layer. Observations during KORUS-AQ also highlight a rapid,40ppbvincreaseinozonepollutionasastrongseabreezefronttraversedtheSeoulMetropolitan Area. Representativeness of meteorology and pollution conditions measured by KORUS-AQ is considered by comparison with climatology. This analysis is an essential step toward improved local and regional forecasting of air quality and visibility.

show abstract

Continuous ground-based aerosol Lidar observation during seasonal pollution events at Wuxi, China

Cited by 13 publications

References 36 publications

Observations of the vertical distributions of summertime atmospheric pollutants and the corresponding ozone production in Shanghai, China

Observations of the vertical distributions of summertime atmospheric pollutants and the corresponding ozone production in Shanghai, China

Observations of the summertime atmospheric pollutants vertical distributions and the corresponding ozone production in Shanghai, China

Meteorology influencing springtime air quality, pollution transport, and visibility in Korea

Contact Info

Product

Resources

About