Impact of synoptic weather patterns on spatio-temporal variation in surface O3 levels in Hong Kong during 1999–2011

Zhang, Yang; Mao, Huiting; Ding, Aijun; Zhou, Derong; Fu, Congbin

doi:10.1016/j.atmosenv.2013.02.047

Cited by 72 publications

(47 citation statements)

References 27 publications

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“…In the PBL (<1 km altitude), the interannual variability of O 3 levels was particularly high, with an annual rate about 61% and over 70% in spring and summer. The high amplitude in summer might be related to relatively low mean O 3 levels under the influence of summer monsoon but a strong year-to-year variability in frequency of occurrence of the Northwest Pacific Typhoon, which has been found to be the main synoptic pattern causing photochemical pollution in South China (Ding et al 2004, 2013, Zhang et al 2013. Because PBL O 3 mixing ratios peaked in the spring and autumn ( figure 1(a)), i.e.…”

Section: Control Of Interannual Variability In the Eam On Lower Tropomentioning

confidence: 98%

“…By comparing data collected during PEM-West B and Trace-P, Wang et al (2003) found that the chemical characteristics of O 3 precursors in springtime continental outflow were influenced by year-to-year variation of weather. Using 12 years of ground based air quality data in Hong Kong, Zhang et al (2013) suggested that synoptic weather, which was influenced by the EAM, impacted significantly the interannual variations in mixing ratios of O 3 and its precursors. However, because these previous studies mainly used surface measurements, there are knowledge gaps in the relationship between O 3 levels and the EAM above the ground surface, especially the relationship between EAM and O 3 from the perspective of interannual scales.…”

Section: Introductionmentioning

confidence: 99%

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Impacts of the East Asian monsoon on lower tropospheric ozone over coastal South China

Zhou

Ding

Mao

et al. 2013

Environ. Res. Lett.

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The impact of the East Asian monsoon (EAM) on climatology and interannual variability of tropospheric ozone (O 3 ) over the coastal South China was investigated by analyzing 11 years of ozonesonde data over Hong Kong with the aid of Lagrangian dispersion modeling of carbon monoxide and calculation of an EAM index. It was found that the seasonal cycle of O 3 in the lower troposphere is highly related to the EAM over the study region. Ozone enhancements in the free troposphere are associated with the monsoon-induced transport of pollutants of continental anthropogenic and biomass burning origins. Lower tropospheric O 3 levels showed high interannual variability, with an annual averaged amplitude up to 61% of averaged concentrations in the boundary layer (0-1 km altitudes) and 49% below 3 km altitude. In spring and autumn, the interannual variability in boundary layer O 3 levels was predominately influenced by the EAM intensity, with high O 3 mixing ratios associated with northeasterly circulation anomalies.

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Section: Control Of Interannual Variability In the Eam On Lower Tropomentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Impacts of the East Asian monsoon on lower tropospheric ozone over coastal South China

Zhou

Ding

Mao

et al. 2013

Environ. Res. Lett.

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“…Ding et al (2004) explained the mechanism of how these tropical cyclones influence the development of sea-land breeze and also explained further about sub-regional and urban air mass accumulation in the South China. Zhang et al (2013) found an important influence of tropical cyclones in ozone and haze pollution in this region in summer, based on an analysis of 13-year data.…”

Section: Temporal Variations and Overall Characteristicsmentioning

confidence: 99%

Observations of aerosol optical properties at a coastal site in Hong Kong, South China

et al. 2017

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Abstract. Temporal variations in aerosol optical properties were investigated at a coastal station in Hong Kong based on the field observation from February 2012 to February 2015. At 550 nm, the average light-scattering (151 ± 100 Mm −1 ) and absorption coefficients (8.3 ± 6.1 Mm −1 ) were lower than most of other rural sites in eastern China, while the single-scattering albedo (SSA = 0.93 ± 0.05) was relatively higher compared with other rural sites in the Pearl River Delta (PRD) region. Correlation analysis confirmed that the darkest aerosols were smaller in particle size and showed strong scattering wavelength dependencies, indicating possible sources from fresh emissions close to the measurement site. Particles with D p of 200-800 nm were less in number, yet contributed the most to the light-scattering coefficients among submicron particles. In summer, both BC / CO and SO 2 / BC peaked, indicating the impact of nearby combustion sources on this site. Multi-year backward Lagrangian particle dispersion modeling (LPDM) and potential source contribution (PSC) analysis revealed that these particles were mainly from the air masses that moved southward over Shenzhen and urban Hong Kong and the polluted marine air containing ship exhausts. These fresh emission sources led to low SSA during summer months. For winter and autumn months, contrarily, BC / CO and SO 2 / BC were relatively low, showing that the site was more under influence of well-mixed air masses from long-range transport including from South China, East China coastal regions, and aged aerosol transported over the Pacific Ocean and Taiwan, causing stronger abilities of light extinction and larger variability of aerosol optical properties. Our results showed that ship emissions in the vicinity of Hong Kong could have visible impact on the light-scattering and absorption abilities as well as SSA at Hok Tsui.

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“…The East Asian monsoon is the dominant meteorological feature of the Pearl River Delta region in China (Zhou et al, 2006;Zhang et al, 2013), with southerly winds prevailing in summer and northerly winds prevailing in winter. These features influence both the accumulation of locally emitted pollutants in Hong Kong and the regional transport of pollutants from mainland China (Jia et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Spatial and Temporal Characteristics and Main Contributing Regions of High PM2.5 Pollution in Hong Kong

Ding

et al. 2017

Aerosol Air Qual. Res.

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Fine particulate matter (PM 2.5 ) pollution episodes occur frequently in most Chinese metropolises. Because Hong Kong is affected by the East Asian monsoon, its high PM 2.5 pollution is potentially contributed to by a combination of local and regional emissions. This study identified the spatial and temporal characteristics and contributing regions of PM 2.5 pollution episodes in Hong Kong. We analyzed the hourly monitoring data collected at various monitoring stations in Hong Kong for the year 2014 in addition to spatial distributions of PM 2.5 in China in the days preceding high pollution episodes, and we identified the spatial and temporal characteristics of high PM 2.5 pollution in Hong Kong. The relative contributions of local and regional sources to high PM 2.5 episodes were then quantified. Finally, backward trajectories of air masses arriving in Hong Kong during high PM 2.5 episodes were generated to determine the main contributing regions. The results indicated that PM 2.5 levels were higher in the northwestern and southeastern parts of Hong Kong and the Yuen Long station observed the most serious pollution, with a highest daily average PM 2.5 concentration of 118 µg m -3; other areas noted relatively lower concentrations, with maximum daily average concentrations less than 100 µg m -3. Regional sources accounted for almost 70% of the PM 2.5 pollution and were mostly from the northern and northeastern areas of Hong Kong. Six main contributing regions were identified: the northern region of Guangdong province, Henan-Shandong, the Yangtze River Delta, Jiangxi, Fujian, and Anhui-Hubei. Among these, Guangdong province contributed the highest proportion of the pollution. Because PM 2.5 is a major air pollutant in Hong Kong, the findings of this study will be useful for forecasting PM 2.5 pollution episodes. Moreover, the developed methodology can be extended to other pollutants if their characteristics and main contributing regions can be identified.

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Impact of synoptic weather patterns on spatio-temporal variation in surface O3 levels in Hong Kong during 1999–2011

Cited by 72 publications

References 27 publications

Impacts of the East Asian monsoon on lower tropospheric ozone over coastal South China

Impacts of the East Asian monsoon on lower tropospheric ozone over coastal South China

Observations of aerosol optical properties at a coastal site in Hong Kong, South China

Spatial and Temporal Characteristics and Main Contributing Regions of High PM2.5 Pollution in Hong Kong

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