Characteristics and origins of air pollutants and carbonaceous aerosols during wintertime haze episodes at a rural site in the Yangtze River Delta, China

Bao, Mengying; Cao, Fang; Chang, Yunhua; Zhang, Yanlin; Gao, Yaqi; Liu, Xiaoyan; Zhang, Yuanyuan; Zhang, Wenqi; Tianran, Tang; Xu, Zufei; Liu, Shoudong; Lee, Xuhui; Li, Jun; Zhang, Gan

doi:10.1016/j.apr.2017.03.001

Cited by 23 publications

(12 citation statements)

References 65 publications

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“…It was reported that WSOC was abundant in biomass burning emissions in previous studies (Jaffrezo et al, 2005;Park and Cho, 2011). In addition, a strong correlation was also found between OC and WSOC (R 2 > 0.70, p < 0.01), and the WSOC/OC mass ratio was averaged to 0.5 ± 0.1, a value consistent with that of another study (Bikkina, 2014). If a major portion of OC was derived from combustion, WSOC could be very likely released from fuel burning.…”

Section: Carbonaceous Componentssupporting

confidence: 89%

“…The footprint was illustrated as FLEXPART potential emission sensitivity, shown as the retention time in each grid at 0-500 m contributing to the observed elemental carbon. and biofuel emissions is larger than 6 (Hoffer et al, 2006;Chen and Bond, 2010;Hecobian et al, 2010;Bikkina, 2014). The AAE mean in this study was 6.6 ± 1.3, ranging from 4.1 to 10.3, and more than 68 % of samples (71 out of 104) had an AAE above 6 ( Fig.…”

Section: Light-absorbing Propertymentioning

confidence: 48%

“…where K is a constant, AAE describes the wavelengthdependent absorption enhancement of BrC, associated with its origin, size and composition (Bikkina, 2014); and λ is wavelength in the range of 310-460 nm. AAE for WSOC was fitted within the range of 310-460 nm in which coefficients of determination (R 2 ) for all samples are above 0.90.…”

Section: Extraction and Analysis Of Wsoc Light-absorbing Propertymentioning

confidence: 99%

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Chemical and optical properties of carbonaceous aerosols in Nanjing, eastern China: regionally transported biomass burning contribution

et al. 2019

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Abstract. Biomass burning can significantly impact the chemical and optical properties of carbonaceous aerosols. Here, the biomass burning impacts were studied during wintertime in a megacity of Nanjing, eastern China. The high abundance of biomass burning tracers such as levoglucosan (lev), mannosan (man), galactosan (gal) and non-sea-salt potassium (nss-K+) was found during the studied period with the concentration ranges of 22.4–1476 ng m−3, 2.1–56.2 ng m−3, 1.4–32.2 ng m−3 and 0.2–3.8 µg m−3, respectively. The significant contribution of biomass burning to water-soluble organic carbon (WSOC; 22.3±9.9 %) and organic carbon (OC; 20.9±9.3 %) was observed in this study. Backward air mass origin analysis, potential emission sensitivity of elemental carbon (EC) and MODIS fire spot information indicated that the elevations of the carbonaceous aerosols were due to the transported biomass-burning aerosols from southeastern China. The characteristic mass ratio maps of lev∕man and lev∕nss-K+ suggested that the biomass fuels were mainly crop residuals. Furthermore, the strong correlation (p < 0.01) between biomass burning tracers (such as lev) and light absorption coefficient (babs) for water-soluble brown carbon (BrC) revealed that biomass burning emissions played a significant role in the light-absorption properties of carbonaceous aerosols. The solar energy absorption due to water-soluble brown carbon and EC was estimated by a calculation based on measured light-absorbing parameters and a simulation based on a radiative transfer model (RRTMG_SW). The solar energy absorption of water-soluble BrC in short wavelengths (300–400 nm) was 0.8±0.4 (0.2–2.3) W m−2 (figures in parentheses represent the variation range of each parameter) from the calculation and 1.2±0.5 (0.3–1.9) W m−2 from the RRTMG_SW model. The absorption capacity of water-soluble BrC accounted for about 20 %–30 % of the total absorption of EC aerosols. The solar energy absorption of water-soluble BrC due to biomass burning was estimated as 0.2±0.1 (0.0–0.9) W m−2, considering the biomass burning contribution to carbonaceous aerosols. Potential source contribution function model simulations showed that the solar energy absorption induced by water-soluble BrC and EC aerosols was mostly due to the regionally transported carbonaceous aerosols from source regions such as southeastern China. Our results illustrate the importance of the absorbing water-soluble brown carbon aerosols in trapping additional solar energy in the low-level atmosphere, heating the surface and inhibiting the energy from escaping the atmosphere.

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Section: Carbonaceous Componentssupporting

confidence: 89%

Section: Light-absorbing Propertymentioning

confidence: 48%

Section: Extraction and Analysis Of Wsoc Light-absorbing Propertymentioning

confidence: 99%

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Chemical and optical properties of carbonaceous aerosols in Nanjing, eastern China: regionally transported biomass burning contribution

et al. 2019

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“…OC and EC were detected using a Desert Research Institute (DRI) Model 2001 Thermal Optical Carbon Analyzer (Atmoslytic Inc., Calabasas, USA). A portion of sampled filter (0.53 cm 2 ) was analyzed following the IMPROVE thermal optical reflectance (TOR) protocol (Bao et al, 2017). For the determination of WSOC, a portion of each filter with a size of 4.02 cm 2 was removed from the parent filter and extracted with 10 mL ultrapure water in a sonication bath for 30 min.…”

Section: Sample Analysis For Carbonaceous Componentsmentioning

confidence: 99%

“…The Potential Source Contribution Function model (PSCF) was usually applied to localize the potential sources of pollutants. The details about the setup of the model can be seen in the research ofBao et al (2017).…”

mentioning

confidence: 99%

Impacts of Regional-transported Biomass Burning Emissions on Chemical and Optical Properties of Carbonaceous Aerosols in Nanjing, East China

Liu

Zhang

Peng

et al. 2019

Preprint

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Abstract. Biomass burning can significantly impact the chemical and optical properties of carbonaceous aerosols. Here, the impacts of biomass burning emissions on chemical and optical properties of carbonaceous aerosols were studied during wintertime in a megacity of Nanjing, East China. The high abundance of biomass burning tracers such as levoglucosan (lev), mannosan (man), galactosan (gal) and non-sea-salt potassium (nss-K+) was found during the studied period with the concentration ranges of 22.4&#8211;1476&#8201;ng&#8201;m&#8722;3, 2.1&#8211;56.2&#8201;ng&#8201;m&#8722;3, 1.4&#8211;32.2&#8201;ng&#8201;m&#8722;3, and 0.2&#8211;3.8&#8201;&#956;g&#8201;m&#8722;3, respectively. Backward air mass origin analysis, potential emission sensitivity of element carbon (EC), and MODIS fire spot information indicated that the elevations of the carbonaceous aerosols were due to the transported biomass-burning aerosols from Southeast China. The characteristic mass ratio maps of lev/man and lev/nss-K+ suggested that the biomass fuels were mainly crop residuals. Furthermore, the strong correlation (p&#8201;<&#8201;0.01) between biomass burning tracers (e.g. lev) and light absorption coefficient (babs) for water soluble organic carbon (WSOC) revealed that biomass burning emissions played a significant role in the light-absorption properties of carbonaceous aerosols. The solar energy absorption due to water-soluble brown carbon (BrC) and EC was estimated by the calculation-based on measured light-absorbing parameters and the simulation-based on a radiative transfer model (RRTMG_SW). The solar energy absorption of water-soluble BrC in short wavelengths (300&#8211;400&#8201;nm) was 0.8&#8201;&#177;&#8201;0.4 (0.2&#8211;2.3)&#8201;W&#8201;m&#8722;2 from the calculation-based and 1.2&#8201;&#177;&#8201;0.5 (0.3&#8211;1.9)&#8201;W&#8201;m&#8722;2 from the RRTMG_SW model. The absorption capacity of water-soluble BrC accounted for about 20&#8211;30&#8201;% of the total absorption of EC aerosols. The solar energy absorption of WSOC due to biomass burning was estimated as 0.2&#8201;&#177;&#8201;0.1 (0.0&#8211;0.9)&#8201;W&#8201;m&#8722;2. Potential Source Contribution Function model simulations showed that the solar energy absorption induced by WSOC and EC aerosols was mostly due to the regional transported carbonaceous aerosols from the source regions such as southeast China. Our results illustrate the importance of the absorbing water-soluble brown carbon aerosols in trapping additional solar energy in the low-level atmosphere, heating the surface and inhibiting the energy from escaping the atmosphere. The regional transported biomass burning emissions may significantly impact the chemical and optical properties of carbonaceous aerosols in the polluted atmosphere.

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Aircraft study of secondary aerosols in long-range transported air masses from the North China Plain by a mid-latitude cyclone

Sun

Nie

Chi³

et al. 2022

Preprint

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Regional transport has been identified as an important contributor to air pollution. Yet, understanding evolution of aerosol components associated with synoptic systems remains limited, particularly in China, where most of the measurement studies were conducted at ground-surface. In this study, an intensive campaign was designed with an aircraft measurement in Northeast China (NEC) together with ground-surface measurements in North China Plain (NCP), to investigate the role that the midlatitude cyclone plays in transporting air pollution, specifically in changing aerosol components during the transport. During a flight on 30 July 2018, high concentrations of aerosols dominated by sulfate were observed in the free troposphere (FT), despite low aerosol loadings dominated by organics in the planetary boundary layer. Model simulations indicated that pollution in the lower free troposphere (LFT) was transported directly from North Hebei by warm and moist air masses, while pollution in the higher free troposphere (HFT) was influenced by the warm conveyor belt (WCB), which transported aerosols from the NCP and lifted them into the HFT. Both particulate nitrate and sulfate were formed productively due to strong emissions and high atmospheric oxidizing capacity in the NCP. During the transport, sulfate concentrations stayed relatively constant while nitrate decreased readily due to evaporation losses, resulting in an increasing contribution of sulfate but a decreasing contribution of nitrate to secondary aerosols along the transport path.

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Characteristics and origins of air pollutants and carbonaceous aerosols during wintertime haze episodes at a rural site in the Yangtze River Delta, China

Cited by 23 publications

References 65 publications

Chemical and optical properties of carbonaceous aerosols in Nanjing, eastern China: regionally transported biomass burning contribution

Chemical and optical properties of carbonaceous aerosols in Nanjing, eastern China: regionally transported biomass burning contribution

Impacts of Regional-transported Biomass Burning Emissions on Chemical and Optical Properties of Carbonaceous Aerosols in Nanjing, East China

Aircraft study of secondary aerosols in long-range transported air masses from the North China Plain by a mid-latitude cyclone

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