PM2.5 carbon measurements in two urban areas: Seoul and Kwangju, Korea

Park, Seung S.; Kim, Young Jin; Fung, Kochy

doi:10.1016/s1352-2310(01)00552-0

Cited by 102 publications

(42 citation statements)

References 22 publications

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“…Cao et al (2009) reported that annual mean concentrations of OC and EC in Hangzhou, China were 24.41 and 4.06 μg/m 3 , respectively. In this study, the OC/EC ratios were lower than those measured in Xi'an (3.2) (Cao et al, 2005) and Hangzhou (6.0) (Cao et al, 2009), China, however, they were higher than those in Beijing, China (2.0) (Zhang et al, 2009) and in Seoul, Korea (1.3) (Park et al, 2002). Particularly, the average OC/EC ratios in daytime were generally higher than the threshold.…”

Section: Chemical Composition Of Pmcontrasting

confidence: 55%

Physicochemical Properties of PM2.5 and PM2.5-10 at Inland and Offshore Sites over Southeastern Coastal Region of Taiwan Strait

Tsai

Yuan

Hung

et al. 2011

Aerosol Air Qual. Res.

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This study investigates the effects of sea-land breezes (SLBs) and northeastern monsoon (NEM) on the physicochemical properties of particulate matter (PM) in the atmosphere over southeastern coastal region of Taiwan Strait. The intensive PM sampling protocol was consecutively conducted for forty-eight hours. During the sampling periods, PM 2.5 and PM 2.5-10 were simultaneously measured with dichotomous samplers at four sites (two inland and two at offshore sites) and PM 10 was measured with beta-ray monitors at these same four sites. Strong SLBs were regularly observed in the coastal region of southern Taiwan during the SLBs periods, while significant northeastern monsoons appeared during the NEM periods. The mass ratios of PM 2.5 /PM 10 during the NEM periods were always higher than the SLBs periods. The most abundant ionic species of PM were SO 4 2-, NO 3 -, and NH 4 + . The most common chemical compounds of PM in southern Taiwan were ammonium sulfate ((NH 4 ) 2 SO 4 ) and ammonium nitrate (NH 4 NO 3 ). Carbon contents of PM during the NEM periods were higher than during the SLBs periods. The organic-to-elemental-carbon ratio (OC/EC) of PM 2.5 ranged from 1.05 to 4.39 with an average of 2.26. The order of major metallic elements of PM 2.5 in the SLBs and NEM periods is Fe > Ca > K > Al > Mg > Zn > Pb and Ca > Fe > Al > K > Mg > V > Ni, respectively, and of PM 2.5-10 is Ca > K > Al > Fe > Mg > Zn and Fe > Ca > Al > K > Mg > V > Ni, respectively. This study reveals that the accumulation of PM offshore, due to land breezes, influences the tempospatial distribution of PM at the coastal region in southern Taiwan. Moreover, the nss- [

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Section: Chemical Composition Of Pmcontrasting

confidence: 55%

Physicochemical Properties of PM2.5 and PM2.5-10 at Inland and Offshore Sites over Southeastern Coastal Region of Taiwan Strait

Tsai

Yuan

Hung

et al. 2011

Aerosol Air Qual. Res.

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“…Table 3 compares the concentration of OC and EC together with OC / EC ratios in East Asia. The annual average concentration of OC in Cape Hedo (1.78 µg m −3 ) is significantly less than those reported in Mongolia during winter , Chinese cities , Pearl Delta region, China (Cao et al, 2003), Kaohsiung, Taiwan (Lin and Tai, 2001) and Seoul, Korea (Park et al, 2002), and is also lower than that of Jeju Island (Lee et al, 2001) where Asian outflow is important. Based on these comparisons, we can insist that concentrations of OC decrease during long-range atmospheric transport via atmospheric dilution and/or dry and wet scavenging.…”

Section: Seasonal Variations Of Oc / Ec and Wsoc / Oc Ratiosmentioning

confidence: 68%

One-year observations of carbonaceous and nitrogenous components and major ions in the aerosols from subtropical Okinawa Island, an outflow region of Asian dusts

2014

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Abstract. Ambient aerosol samples (TSP, n = 50) were collected for 12 months at subtropical Okinawa Island, Japan, an outflow region of Asian dusts in the western North Pacific and analysed for organic carbon (OC), elemental carbon (EC), water-soluble organic carbon (WSOC), water-soluble total nitrogen (WSTN), water-soluble organic nitrogen (WSON) and major ions to better understand the formation and transformation of East Asian aerosols during long-range atmospheric transport. Concentration ranges of these components are; OC: 0.76-7.1 µg m −3 (av. and Ca 2+ play major role in the neutralization of acidic aerosols forming NH 4 HSO 4 , (NH 4 ) 2 SO 4 and CaSO 4 .

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“…The value was corrected to 0.10 ppb/min considering the dilution effect due to increment of mixing layer height. The data of the mixing layer height of the troposphere in Seoul were reported by Park et al (2002). The k 1 from 8:00 a.m. to 9:00 a.m. (k 1,t8-9 in Eq.…”

Section: Prediction Of Daytime Ozone Concentrationmentioning

confidence: 99%

Correlation between Light Intensity and Ozone Formation for Photochemical Smog in Urban Air of Seoul

Seung-Bok

Bae

Young-Mee

et al. 2010

Aerosol Air Qual. Res.

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Urban residents are exposed to high levels of ozone that are produced by photochemical reactions of ambient air in strong sunlight. The potential for ozone formation of urban air needs to be characterized in order to avoid exposure to unexpectedly high ozone concentrations during the daytime. In this study, ten sets of twin smog chamber experiments were carried out to determine the correlation between light intensity and ozone formation during photochemical reactions of urban air in Seoul. Single chamber analysis revealed a higher rate of ozone production under higher irradiation than under less intense irradiation under similar initial ambient air conditions. However, the rate of ozone production showed significant variations at the same light intensity. Here, the ratio of two light intensities for both chambers was introduced as a key parameter. The ratio of ozone production was dependent on the ratio of the two light intensities according to a power function with a factor of approximately 1.8. The proposed correlation was used to predict the daytime ozone concentration for calm, clear and dry weather conditions.

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PM2.5 carbon measurements in two urban areas: Seoul and Kwangju, Korea

Cited by 102 publications

References 22 publications

Physicochemical Properties of PM2.5 and PM2.5-10 at Inland and Offshore Sites over Southeastern Coastal Region of Taiwan Strait

Physicochemical Properties of PM2.5 and PM2.5-10 at Inland and Offshore Sites over Southeastern Coastal Region of Taiwan Strait

One-year observations of carbonaceous and nitrogenous components and major ions in the aerosols from subtropical Okinawa Island, an outflow region of Asian dusts

Correlation between Light Intensity and Ozone Formation for Photochemical Smog in Urban Air of Seoul

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