An observational and numerical study of the effects of the late sea breeze on ozone distributions in the Busan metropolitan area, Korea

Oh, Inbo; Kim, Yoo-Keun; Lee, Hwa Woon; Kim, Cheol-Hee

doi:10.1016/j.atmosenv.2005.10.049

Cited by 61 publications

(36 citation statements)

References 21 publications

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“…We speculated that the recirculation of pollutants by sea-and land-breeze circulations around the cities along the YRD and Hangzhou Bay, which has been confirmed by M. M. , was largely responsible for the increased concentration of O 3 at the NRCS site. Such an increase in O 3 concentrations in urbanized coastal areas has been observed and modeled in a number of studies (Oh et al, 2006;Levy et al, 2008;Martins et al, 2012). Thus, our study further emphasizes the importance of local thermally induced circulation for air quality.…”

Section: Dependences Of Pollutant Concentrations On Local Emission Anmentioning

confidence: 52%

“…The secondary particulate formation may be related to a high conversion rate of SO 2 and NO x to sulfate and nitrate under a high concentration of oxidants (Khoder, 2002;. Additionally, it was also associated with the formation of secondary organic aerosols with high O 3 concentrations (Kamens et al, 1999;Lambe et al, 2015;Palm et al, 2017), which were primarily produced through the photooxidation of BVOCs (Claeys, et al, 2004;Böge et al, 2013). As inferred above, significant emission of BVOCs was speculated around NRCS in summer.…”

Section: Interspecies Correlationsmentioning

confidence: 99%

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Characterization of atmospheric trace gases and particulate matter in Hangzhou, China

Zhang

et al. 2018

Atmos. Chem. Phys.

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Abstract. The Yangtze River Delta (YRD) is one of the most densely populated regions in China with severe air quality issues that have not been fully understood. Thus, in this study, based on 1-year (2013) continuous measurement at a National Reference Climatological Station (NRCS, 30.22 • N, 120.17 • E; 41.7 m a.s.l.) in the center of Hangzhou in the YRD, we investigated the seasonal characteristics, interspecies relationships, and the local emissions and the regional potential source contributions of trace gases (including O 3 , NO x , NO y , SO 2 , and CO) and particulate matter (PM 2.5 and PM 10 ). Results revealed that severe two-tier air pollution (photochemical and haze pollution) occurred in this region, with frequent exceedances in O 3 (38 days) and PM 2.5 (62 days). O 3 and PM 2.5 both exhibited distinct seasonal variations with reversed patterns: O 3 reaching a maximum in warm seasons (May and July) but PM 2.5 reaching a maximum in cold seasons (November to January). The overall results from interspecies correlation indicated a strong local photochemistry favoring the O 3 production under a volatile organic compound (VOC)-limited regime, whereas it moved towards an optimum O 3 production zone during warm seasons, accompanied by the formation of secondary fine particulates under high O 3 . The emission maps of PM 2.5 , CO, NO x , and SO 2 demonstrated that local emissions were significant for these species on a seasonal scale. The contributions from the regional transport among inland cities (Zhejiang, Jiangsu, Anhui, and Jiangxi Province) on a seasonal scale were further confirmed to be crucial to air pollution at the NRCS site by using backward trajectory simulations. Air masses transported from the offshore areas of the Yellow Sea, East Sea, and South Sea were also found to be highly relevant to the elevated O 3 at the NRCS site through the analysis of potential source contribution function (PSCF). Case studies of photochemical pollution (O 3 ) and haze (PM 2.5 ) episodes both suggested the combined importance of local atmospheric photochemistry and synoptic conditions during the accumulation (related with anticyclones) and dilution process (related with cyclones). Apart from supplementing a general picture of the air pollution state in the city of Hangzhou in the YRD region, this study specifically elucidates the role of local emission and regional transport, and it interprets the physical and photochemical processes during haze and photochemical pollution episodes. Moreover, this work suggests that cross-regional control measures are crucial to improve air quality in the YRD region, and it further emphasizes the importance of local thermally induced circulation for air quality.

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Section: Dependences Of Pollutant Concentrations On Local Emission Anmentioning

confidence: 52%

Section: Interspecies Correlationsmentioning

confidence: 99%

Characterization of atmospheric trace gases and particulate matter in Hangzhou, China

Zhang

et al. 2018

Atmos. Chem. Phys.

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“…The recirculation of polluted air originating from coastal source areas is also suggested in association with a late sea breeze, 17,32 which makes it possible for the O 3 levels along the coast to increase. In the same manner, O 3 levels over the western coastal area in P2 were found to increase similarly, due to the late sea breeze resulting from its interaction with the offshore synoptic flow.…”

Section: Association Of the Sea Breeze Combined Withmentioning

confidence: 99%

“…Thus, the recirculation of air loaded with O 3 or its precursors frequently occurred with the late sea breeze, apparently leading to higher O 3 concentrations in the coastal GSA area. 17,31,37 …”

Section: A Case Study For Major O 3 Patternsmentioning

confidence: 99%

Identification and Interpretation of Representative Ozone Distributions in Association with the Sea Breeze from Different Synoptic Winds over the Coastal Urban Area in Korea

Hwang

Kim

et al. 2007

Journal of the Air & Waste Management Association

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To aid the studies of long-term impact assessment of cumulative ozone (O 3 ) exposures, the representative 8-hr O 3 pollution patterns have been identified over the Greater Seoul Area (GSA) in Korea. Principal component analysis and two-stage clustering techniques were used to identify the representative O 3 patterns, and numerical and observational analyses were also used to interpret the identified horizontal distribution patterns. The results yielded three major O 3 distribution patterns, and each of the three patterns was found to have strong correlations with local and synoptic meteorological conditions over the GSA. For example, pattern 1, accounting for 46% of O 3 concentration distributions, mostly occurred under relatively weak westerly synoptic winds. The predominant features of this pattern were infrequent high O 3 levels but a distinct gradient of O 3 concentration from the western coastal area to the eastern inland area that was mainly induced by the local sea breeze. Pattern 2, accounting for 31% of O 3 concentration distributions, was found with higher O 3 levels in the western coastal area but lower in the eastern inland area. This is due to the modified sea breeze under the relatively stronger easterly opposing synoptic wind, affecting the high O 3 occurrence in the western coastal area only. However, pattern 3, accounting for 21% of O 3 concentration distributions, showed significantly higher O 3 concentrations over the whole GSA mainly due to the retarded and slow-moving sea-breeze front under the weak opposing synoptic flow. Modeling study also indicated that local and synoptic meteorological processes play a major role in determining the high O 3 concentration distribution patterns over the GSA. INTRODUCTIONGround-level ozone (O 3 ) adversely affects vegetation and human health. 1 In assessing plant response and health effects, the duration of exposure as well as peak concentration of O 3 has been recognized to be an important factor. [1][2][3][4] In 1997, the U.S. Environmental Protection Agency (EPA) promulgated a new 8-hr standard for estimating multiple-hour exposures to moderate O 3 concentrations, and the 8-hr standard has been used in several impact assessments using data analysis and modeling studies. [5][6][7][8] Multiyear photochemical model simulation is the most promising way to address the cumulative O 3 exposure problem, done through precise, long-term impact studies of high O 3 concentrations. However, running air quality models that cover longer-periods have generally been prohibitively complicated because of incomplete emission inventories and difficulties in constructing precise wind fields. Numerical modeling studies have suggested that, because of input demand and computational load, an episode aggregation approach by identifying several representative air quality patterns is an effective alternative to developing and running a long-term air quality model. For this reason, the air quality regimes over non-urban areas utilizing the spatiotemporal variability of dai...

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“…Using previous works which looking for to know episode situations (Cristofanelli et al, 2006;Oh et al, 2006), have been used two parameters. The daily ozone maximum and the threshold established to protect the human health (Directive, 2008).…”

Section: Identification Ocurrence and Ozone Events Characteristicsmentioning

confidence: 99%

Assessment on the Ozone Air Pollution in a Medium Metropolitan Area: Seville (Spain)

Adame¹,

Lozano²,

Contreras³

et al. 2011

Advanced Air Pollution

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An observational and numerical study of the effects of the late sea breeze on ozone distributions in the Busan metropolitan area, Korea

Cited by 61 publications

References 21 publications

Characterization of atmospheric trace gases and particulate matter in Hangzhou, China

Characterization of atmospheric trace gases and particulate matter in Hangzhou, China

Identification and Interpretation of Representative Ozone Distributions in Association with the Sea Breeze from Different Synoptic Winds over the Coastal Urban Area in Korea

Assessment on the Ozone Air Pollution in a Medium Metropolitan Area: Seville (Spain)

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