Monitoring of black carbon concentration at an inland rural area including fixed sources in Korea

Lee, Jeong-Hoon; Yun, Jeongseok; Kim, Kyeong Jun

doi:10.1016/j.chemosphere.2015.04.003

Cited by 20 publications

(7 citation statements)

References 17 publications

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“…The average of eBC concentrations was 1.23 μg/m 3 , and the average of EC concentrations was also 1.23 μg/m 3 . The level of EC and eBC concentrations was similar to the average eBC concentration measured by our group [17]. Thus, the EC and eBC concentrations are comparable.…”

Section: Comparison Of Ec With Ebcsupporting

confidence: 88%

“…Equivalent black carbon (eBC) concentration is usually measured by filter-based optical transmittance instruments such as an aethalometer, and its limitation has been updated [14]. A multi-angle absorption photometer (MAAP), another filter-based instrument, was successfully applied to the continuous monitoring of local eBC concentrations for more than three months [16,17]. Thus, we employed the MAAP in order to verify EC concentrations with the help of eBC concentrations.…”

Section: Introductionmentioning

confidence: 99%

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Elemental Carbon and Its Fractions during Evolved Gas Analysis with Respect to Pyrolytic Carbon and Split Time

2021

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We demonstrated the relationships between elemental carbon (EC) and EC fractions during evolved gas analysis (EGA) for PM2.5 sampled at KOREATECH from 29 March 2018 to 12 May 2018. The EC concentrations were compared to the concentrations of equivalent black carbon to confirm that the level of EC concentrations analyzed in this study was valid. Among various EC fractions and their combination, EC1+EC3 fractions were best correlated with the EC concentrations. Especially, dominant EC fraction was related with the dependence of carbon oxidation quantity on the oxidation temperature. We also examined the relationships between pyrolytic carbon (PyC) and EC concentration with respect to the split time. PyC was correlated with the split time in the phase of oxygen-helium mixture. PyC was close to zero for the split time in the helium phase. It is novel, as far as the authors know, that the correlation between PyC and the split time under NIOSH 5040 protocol was reported with regard to EGA. We believe that our study helps to identify what causes uncertainty in the quantification of PyC.

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Section: Comparison Of Ec With Ebcsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Elemental Carbon and Its Fractions during Evolved Gas Analysis with Respect to Pyrolytic Carbon and Split Time

2021

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“…The concentration of atmospheric primary aerosols is a function of atmospheric dispersion, removal processes (vertical and horizontal) and emission rates (Husain et al, 2007). The decrease in BC concentration during mid-day emerges to be strongly impacted by the increased horizontal and vertical dispersion as the vehicular emissions over the cities are assumed to remain the same throughout the day (Bond et al, 2004;Cohen and Wang, 2014;Lee et al, 2016). A mathematical model, which converts mass concentration of BC into its emissions has been used previously for estimation of BC emissions over the different regions including India (Dutkiewicz et al, 2009;Bano et al, 2011;Dumka et al 2013) considering local/regional vertical and horizontal dispersion rates and the mean concentrations times the affected volume which can be taken as the area of the city times the boundary layer heights et al, 2009).…”

Section: Estimation Of Bc Emissionmentioning

confidence: 99%

Significant cooling effect on the surface due to soot particles over Brahmaputra River Valley region, India: An impact on regional climate

Tiwari

Kumar

Tunved

et al. 2016

Science of The Total Environment

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Black carbon (BC) is an important atmospheric aerosol constituent that affects the climate by absorbing (directly) the sunlight and modifying cloud characteristics (indirectly). Here, we present first time yearlong measurements of BC and carbon monoxide (CO) from an urban location of Guwahati located in the Brahmaputra River valley (BRV) in the northeast region of India from 1st July 2013 to 30th June 2014. Daily BC concentrations varied within the range of 2.86 to 11.56μgm(-3) with an annual average of 7.17±1.89μgm(-3), while, CO varied from 0.19 to 1.20ppm with a mean value of 0.51±0.19ppm during the study period. The concentrations of BC (8.37μgm(-3)) and CO (0.67ppm) were ~39% and ~55% higher during the dry months (October to March) than the wet months (April to September) suggesting that seasonal changes in meteorology and emission sources play an important role in controlling these species. The seasonal ΔBC/ΔCO ratios were highest (lowest) in the pre-monsoon (winter) 18.1±1.4μgm(-3)ppmv(-1) (12.6±2.2μgm(-3)ppmv(-1)) which indicate the combustion of biofuel/biomass as well as direct emissions from fossil fuel during the pre-monsoon season. The annual BC emission was estimated to be 2.72Gg in and around Guwahati which is about 44% lower than the mega city 'Delhi' (4.86Gg). During the study period, the annual mean radiative forcing (RF) at the top of the atmosphere (TOA) for clear skies of BC was +9.5Wm(-2), however, the RF value at the surface (SFC) was -21.1Wm(-2) which indicates the net warming and cooling effects, respectively. The highest RF at SFC was in the month of April (-30Wm(-2)) which is coincident with the highest BC mass level. The BC atmospheric radiative forcing (ARF) was +30.16 (annual mean) Wm(-2) varying from +23.1 to +43.8Wm(-2). The annual mean atmospheric heating rate (AHR) due to the BC aerosols was 0.86Kday(-1) indicates the enhancement in radiation effect over the study region. The Weather Research and Forecasting model coupled with Chemistry (WRF-Chem) captured the seasonal cycle of observed BC fairly well but underestimated the observed BC during the month of May-August. Model results show that BC at Guwahati is controlled mainly by anthropogenic emissions except during the pre-monsoon season when open biomass burning also makes a similar contribution.

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“…Ambient PTI data were compared with eBC mass concentrations measured with a multi-angle absorption photometer (MAAP 5012, Thermo Scientific, USA) installed at the monitoring site (37.521 • N, 127.124 • E) in Olympic Park in Seoul, South Korea. MAAP measurements of aerosol absorption coefficients were shown to be in excellent agreement with reference measurements [21], the MAAP instrument and its operation have been described in detail [22], and more recently, its long-term (> 1 month) performance was verified through a continuous measurement [23].…”

Section: Characterization Of Ambient Equivalent Black Carbon (Ebc)mentioning

confidence: 55%

Measurement of Light Absorbing Aerosols with Folded-Jamin Photothermal Interferometry

Lee

Moosmüller

2020

Sensors

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In this study, a photothermal interferometer was developed, based on a folded-Jamin polarization instrument with refractive-index sensitive configuration, in order to characterize light-absorbing aerosols. The feasibility of our interferometric technique was demonstrated by performing photothermal spectroscopy characterizing spark-generated black carbon particles with atmospherically relevant concentrations and atmospheric aerosols in a metropolitan area. The sensitivity of this interferometric system for both laboratory-generated aerosols and atmospheric aerosols was ~ 1 (μg/m3)/μV, which is sufficient for the monitoring of black carbon aerosol in urban areas.

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Monitoring of black carbon concentration at an inland rural area including fixed sources in Korea

Cited by 20 publications

References 17 publications

Elemental Carbon and Its Fractions during Evolved Gas Analysis with Respect to Pyrolytic Carbon and Split Time

Elemental Carbon and Its Fractions during Evolved Gas Analysis with Respect to Pyrolytic Carbon and Split Time

Significant cooling effect on the surface due to soot particles over Brahmaputra River Valley region, India: An impact on regional climate

Measurement of Light Absorbing Aerosols with Folded-Jamin Photothermal Interferometry

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