Seasonal characteristics of water-soluble organic carbon in atmospheric particles in the inland Kanto plain, Japan

Kumagai, Kimiyo; Iijima, Akihiro; Tago, Hiroshi; Tomioka, Atsushi; Kozawa, Kunihisa; Sakamoto, Kazuhiko

doi:10.1016/j.atmosenv.2009.04.008

Cited by 48 publications

(35 citation statements)

References 25 publications

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“…The proportion of WSOC in OC was higher than that of WIOC (43.61%), indicating WSOC was the major component of the OC in YRD. Parallel phenomenon was found in the observation of Kanto plain (Kumagai et al, 2009), Gwangju (Park et al, 2013) and so on. In addition, WSOC/OC ratio can also be used to assess the photochemical aging of organics, especially for the longrange transported aerosols (Kumagai et al, 2009).…”

Section: Calculation Of Sea-salt Sourcementioning

confidence: 81%

“…Parallel phenomenon was found in the observation of Kanto plain (Kumagai et al, 2009), Gwangju (Park et al, 2013) and so on. In addition, WSOC/OC ratio can also be used to assess the photochemical aging of organics, especially for the longrange transported aerosols (Kumagai et al, 2009). Compared with some urban regions in China, such as Shanghai (0.35), Guangzhou (0.32), Lanzhou (0.40) (Pathak et al, 2011), the WSOC/OC ratio was relative higher, suggesting organic aerosol in YRD was aged and mainly transported from other source regions.…”

Section: Calculation Of Sea-salt Sourcementioning

confidence: 81%

“…Overall, the level of WSOC ranged from 0.03 to 14.56 mg m À3 with an average value of 3.09 ± 2.45 mg m À3 , representing 56.39% of OC. The concentration was much lower than that in some urban area in China, such as Beijing (6.7 ± 4.4 mg m-3) (Du et al, 2014), Shanghai (5.8 ± 4.2) (Pathak et al, 2011), while was comparable to some typical cities abroad (Kumagai et al, 2009;Park et al, 2011). The proportion of WSOC in OC was higher than that of WIOC (43.61%), indicating WSOC was the major component of the OC in YRD.…”

Section: Calculation Of Sea-salt Sourcementioning

confidence: 85%

“…This implied their emission sources were similar and their formation pathways were almost stable during day and night time. The relative higher concentration in day time suggested the stronger emissions of these species or their precursors at that time, mainly ascribing to the human activities (Kumagai et al, 2009). In order to further explore the fluctuation reason of WSOC in day and night time, two high intensity collections in 6 h interval were conducted during 1st 18:00 to 4th 18:00 and 18th 18:00 to 21st 18:00 in June 2013.…”

Section: Regime and Intraday Fluctuation Of Wsoc In Summermentioning

confidence: 99%

“…Because of its affinity with water, WSOC is absolutely responsible for altering the aerosol hygroscopicity, determining the particles acting as cloud condensation nuclei (CCN), and even for the formation of haze (Haque et al, 2016;Huang et al, 2006;Saffari et al, 2016;Sun et al, 2016;Wu et al, 2016). Generally, WSOC can be either directly emitted or formed in the atmosphere via the oxidation of the anthropogenic and biogenic volatile organic compounds (VOCs) (Kumagai et al, 2009). The latter was believed as the major formation pathway (Miyazaki et al, 2007), but rarely confirmed in field observation.…”

Section: Introductionmentioning

confidence: 99%

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Source and formation characteristics of water-soluble organic carbon in the anthropogenic-influenced Yellow River Delta, North China

Zong

Wang

Tian

et al. 2016

Atmospheric Environment

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h i g h l i g h t sHigh intensity measurement of WSOC in PM 2.5 was conducted at Yellow River Delta. WSOC concentration in day time was obviously higher than night time. WSOC was mostly secondary formation product and was enhanced at high level of acidity. Biogenic and biomass burning (B&B) was the major source of WSOC. Fossil fuel contribution, mainly vehicle emission, could not be ignored. High intensity measurement of water-soluble organic carbon (WSOC) in PM 2.5 was conducted at Yellow River Delta (YRD), North China, from 29 May to 1 July 2013. On average, concentration of WSOC was 3.09 ± 2.45 mg m À3 with a relative high WSOC/OC mass ratio (56.39%), implying organic aerosol in YRD was aged. WSOC concentration in day time was obviously higher than night time, which was mainly attributed to the decrease of source emission. While secondary formation of WSOC was strengthen in night time under stable atmospheric condition. The significant relationship between WSOC and SOC indicated WSOC was mostly secondary formation product. Furthermore, WSOC formation was enhanced at high level of acidity, providing direct evidence for the great impact of aerosol acidity on WSOC formation. WSOC correlated well with nss-K þ , nss-SO 4 2À , NO 3 À , Zn and Cu, suggesting a major part of observed WSOC and/or its precursors was of biomass burning and fossil fuel combustion origin. Moreover, vehicle emission may make great proportion in the fossil fuel combustion. Conditional probability function (CPF) analysis showed significant contribution of WSOC occurred when wind came from southerly (135e195 ) and northwesterly (285, 345 ) directions. In order to further confirm the source of WSOC, two merged samples representing the two directions were selected for radiocarbon ( 14 C) measurement. 14 C results demonstrated the average value of G c (WSOC) was 0.57 ± 0.01, implying biogenic and biomass burning (B&B) was the major source of WSOC. However, fossil fuel contribution could not be ignored in North China in summer.

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Section: Calculation Of Sea-salt Sourcementioning

confidence: 81%