Photochemical smog pollution in the Bangkok Metropolitan Region of Thailand in relation to O3 precursor concentrations and meteorological conditions

Zhang, B.-N.; Oanh, Nguyen Thi Kim

doi:10.1016/s1352-2310(02)00348-5

Cited by 89 publications

(65 citation statements)

References 13 publications

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“…In Sao Paulo in Brazil, the increased MLH and the enhanced wind speeds could promote the dilution of surface ozone and resulted in the decrease of ozone levels (SachezCcoyllo et al, 2006). The ozone levels during the premonsoon were observed to be significantly higher than the values during the monsoon in Thailand and Nepal (Zhang and Kim Oanh, 2002;Pudasainee et al, 2006). During the premonsoon, the metrological conditions of high air temperature, strong solar radiation and lack of rainfall could give rise to the accumulation of ground-level ozone.…”

Section: Introductionmentioning

confidence: 88%

Influences of characteristic meteorological conditions on atmospheric carbonyls in Beijing, China

Pang

Lee

et al. 2009

Atmospheric Research

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Atmospheric pollutants are controlled not only by their production rates but also by meteorological conditions. The influences of dust storm, sauna weather (haze with high temperature and high humidity), wet precipitation and wind speed on atmospheric carbonyls in Beijing were investigated. During a severe dust episode (April 17, 2006), the mixing ratios of carbonyls were significantly elevated to 13-27 ppbV from 7 to 13 ppbV in the previous non-dust days (April 15 and 16) with the increasing extents of 38-154%. The accumulating effect and the lower photolysis rate in the dust day may be responsible for the increases of carbonyls' levels. Additionally, the contribution from heterogeneous reactions occurring on dust particles to formaldehyde and acetaldehyde cannot be ruled out. During the period of typical sauna weather, the concentrations of atmospheric carbonyls increased to 18-60 ppbV from 10 to 17 ppbV before the sauna days. The air mass over Beijing during the sauna days was controlled by a subtropical anticyclone and the boundary layer became quite stable, which was beneficial to the rapid accumulation of air pollutants including carbonyls. Wet precipitation was found to be an effective removal process to the atmospheric carbonyls. After one-hour of rain in summer, the total concentrations of atmospheric carbonyls decreased to less than half of that before the rainfall. The similar temporal varying patterns of carbonyls and inorganic ions in rainwater indicated that carbonyls were mainly washed out from the atmosphere into rainwater as inorganic ions were. Strong wind could evidently dilute atmospheric carbonyls and a negative correlation was found between wind speeds and the concentrations of carbonyls in spring in Beijing.

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Section: Introductionmentioning

confidence: 88%

Influences of characteristic meteorological conditions on atmospheric carbonyls in Beijing, China

Pang

Lee

et al. 2009

Atmospheric Research

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“…Vegetation fires cause serious smoke pollution and trans-boundary haze episodes throughout SEA (e.g., Qadri, 2001). Overall, biomass burning in SEA is associated with poor air quality and widespread environmental decline (e.g., Kunii et al, 2002;Dawud, 1998;Balasubramanian et al, 1999;Aditama, 2000;Kunii et al, 2002;Zhan et al, 2002;Zhang and Oanh, 2002;Tipayarom and Oanh, 2007;Wiwanitkit, 2008;Pengchai et al, 2009;Hyer and Chew, 2010;Silva et al, 2010;Sundarambal et al, 2010;Oanh et al, 2011).…”

Section: The Nature Of Biomass Burning Emissions In Seamentioning

confidence: 99%

Observing and understanding the Southeast Asian aerosol system by remote sensing: An initial review and analysis for the Seven Southeast Asian Studies (7SEAS) program

Reid¹,

Hyer²,

Johnson

et al. 2013

Atmospheric Research

290

264

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“…9, the diurnal variation of O 3 at BL is typical for large polluted cities, with minimum values in the early morning, a strong rise during the morning with the increasing solar radiation, peak mixing ratios at about 14:00, and a decline due to ozone destruction by NO during night time (Lal et al, 2000;Duenas et al, 2002;Zhang and Kim, 2002;Ribas and Peuelas, 2004;Mazzeo et al, 2005). While there is no large difference in the diurnal variation of O 3 between the three types at BL, different features are found for SDZ.…”

Section: Pollutants' Diurnal Variations and Influence Of Transportmentioning

confidence: 99%

Measurements of ozone and its precursors in Beijing during summertime: impact of urban plumes on ozone pollution in downwind rural areas

Zhang

et al. 2011

Atmos. Chem. Phys.

122

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Abstract. Sea-land and mount-valley circulations are the dominant mesoscale synoptic systems affecting the Beijing area during summertime. Under the influence of these two circulations, the prevailing wind is southwesterly from afternoon to midnight, and then changes to northeasterly till forenoon. In this study, surface ozone (O 3 ), carbon monoxide (CO), nitric oxide (NO), nitrogen dioxide (NO 2 ), nitrogen oxide (NO x ) and non-methane hydrocarbons (NMHCs) were measured at four sites located along the route of prevailing wind, including two upwind urban sites (Fengtai "FT" and Baolian "BL"), an upwind suburban site (Shunyi "SY") and a downwind rural site (Shangdianzi "SDZ") during 20 June-16 September 2007. The purpose is to improve our understanding of ozone photochemistry in urban and rural areas of Beijing and the influence of urban plumes on ozone pollution in downwind rural areas. It is found that ozone pollution was synchronism in the urban and rural areas of Beijing, coinciding with the regional-scale synoptic processes. Due to the high traffic density and local emissions, the average levels of reactive gases NO x and NMHCs at the non-rural sites were much higher than those at SDZ. The level of long-lived gas CO at SDZ was comparable to, though slightly lower than, at the urban sites. We estimate the photochemical reactivity (L OH ) and the ozone formation potential (OFP) in the urban (BL) and rural (SDZ) areas using measured CO and NMHCs. The OH loss rate coefficient (L OH ) by total NMHCs at the BL and SDZ sites are estimated to be 50.7 s −1Correspondence to: J. Z. Ma (mjz@cams.cma.gov.cn) and 15.8 s −1 , respectively. While alkenes make a major contribution to the L OH , aromatics dominate OFP at both urban and rural sites. With respect to the individual species, CO has the largest ozone formation potential at the rural site, and at the urban site aromatic species are the leading contributors. While the O 3 diurnal variations at the four sites are typical for polluted areas, the ozone peak values are found to lag behind one site after another along the route of prevailing wind from SW to NE. Intersection analyses of trace gases reveal that polluted air masses arriving at SDZ were more aged with both higher O 3 and O x concentrations than those at BL. The results indicate that urban plume can transport not only O 3 but its precursors, the latter leading more photochemical O 3 production when being mixed with background atmosphere in the downwind rural area.

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Photochemical smog pollution in the Bangkok Metropolitan Region of Thailand in relation to O3 precursor concentrations and meteorological conditions

Cited by 89 publications

References 13 publications

Influences of characteristic meteorological conditions on atmospheric carbonyls in Beijing, China

Influences of characteristic meteorological conditions on atmospheric carbonyls in Beijing, China

Observing and understanding the Southeast Asian aerosol system by remote sensing: An initial review and analysis for the Seven Southeast Asian Studies (7SEAS) program

Measurements of ozone and its precursors in Beijing during summertime: impact of urban plumes on ozone pollution in downwind rural areas

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