Light absorption properties and molecular profiles of HULIS in PM2.5 emitted from biomass burning in traditional “Heated Kang” in Northwest China

Zhang, Tian; Shen, Zhenxing; Zeng, Yaling; Cheng, Conglan; Wang, Diwei; Zhang, Qian; Lei, Yali; Zhang, Yue; Sun, Jian; Xu, Hongmei; Ho, Steven Sai Hang; Cao, Junji

doi:10.1016/j.scitotenv.2021.146014

Cited by 31 publications

(17 citation statements)

References 67 publications

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“…The average concentration of OC, a major chemical component of PM 2.5 , ranged from 5.6 to 19.4 µg m −3 in six megacities; these cities can be arranged (in descending order) as follows in terms of the average OC concentration: S2). Similar to the PM 2.5 trend, the average OC concentration in the northern cities (15.5 ± 7.9 µg m −3 ) was higher than that in the southern cities (9.2 ± 4.6 µg m −3 ), which can be attributed to substantial emissions from residential heating (i.e., coal and biomass combustion) in winter in northern China (Zhang et al, 2021). In addition, these residential fuels can emit an abundance of OC emissions (Lei et al, 2018;Sun et al, 2017).…”

Section: General Description Of Pm 25 and Its Chemical Species In Six...mentioning

confidence: 57%

Winter brown carbon over six of China's megacities: light absorption, molecular characterization, and improved source apportionment revealed by multilayer perceptron neural network

Wang

Shen²,

Zhang³

et al. 2022

Atmos. Chem. Phys.

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Abstract. Brown carbon (BrC) constitutes a large fraction of organic carbon and exhibits strong light absorption properties, thus affecting the global radiation budget. In this study, we investigated the light absorption properties, chemical functional bonds, and sources of BrC in six megacities in China, namely Beijing, Harbin, Xi'an, Chengdu, Guangzhou, and Wuhan. The average values of the BrC light absorption coefficient and the mass absorption efficiency at 365 nm in northern cities were higher than those in southern cities by 2.5 and 1.8 times, respectively, demonstrating the abundance of BrC present in northern China's megacities. Fourier transform infrared (FT-IR) spectra revealed sharp and intense peaks at 1640, 1458–1385, and 1090–1030 cm−1, which were ascribed to aromatic phenols, confirming the contribution of primary emission sources (e.g., biomass burning and coal combustion) to BrC. In addition, we noted peaks at 860, 1280–1260, and 1640 cm−1, which were attributed to organonitrate and oxygenated phenolic groups, indicating that secondary BrC also existed in the six megacities. Positive matrix factorization (PMF) coupled with multilayer perceptron (MLP) neural network analysis was used to apportion the sources of BrC light absorption. The results showed that primary emissions (e.g., biomass burning, tailpipe emissions, and coal combustion) made a major contribution to BrC in the six megacities. However, secondary formation processes made a greater contribution to light absorption in the southern cities (17.9 %–21.2 %) than in the northern cities (2.1 %–10.2 %). These results can provide a basis for the more effective control of BrC to reduce its impacts on regional climates and human health.

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Section: General Description Of Pm 25 and Its Chemical Species In Six...mentioning

confidence: 57%

Winter brown carbon over six of China's megacities: light absorption, molecular characterization, and improved source apportionment revealed by multilayer perceptron neural network

Wang

Shen²,

Zhang³

et al. 2022

Atmos. Chem. Phys.

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“…Chen et al 11 found in Nagoya, an urban site in Japan, that HULIS with neutral nature have low O/C ratios (mean: 0.4) and are abundant in aliphatic structures and hydroxyl groups, while HULIS with acidic nature have moderate O/C ratios (mean: 0.7) and contain relatively large amounts of low-molecular-weight carboxylic acids and alcohols. Zhang et al 16 found that HULIS from biomass burning sources mainly have O-containing, aliphatic C–H, and aromatic C=C functional groups. Sun et al 10 identified species of HULIS in less polluted (~ 1800) and highly polluted (~ 2800) samples.…”

Section: Introductionmentioning

confidence: 99%

Abundance, chemical structure, and light absorption properties of humic-like substances (HULIS) and other organic fractions of forest aerosols in Hokkaido

Afsana

Zhou

Miyazaki

et al. 2022

Sci Rep

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Atmospheric organic aerosol (OA) are considered as a significant contributor to the light absorption of OA, but its relationship with abundance, composition and sources are not understood well. In this study, the abundance, chemical structural characteristics, and light absorption property of HULIS and other low-to-high polar organics in PM0.95 collected in Tomakomai Experimental Forest (TOEF) were investigated with consideration of their possible sources. HULIS were the most abundant (51%), and correlation analysis revealed that biogenic secondary organic aerosols significantly contribute to HULIS. The mass spectra obtained using a high-resolution aerosol mass spectrometer (HR-AMS) showed that HULIS and highly polar water-soluble organic matter (HP-WSOM) were substantially oxygenated organic aerosol fractions, whereas water-insoluble organic matter (WISOM) had a low O/C ratio and more hydrocarbon-like structures. The WISOM fraction was the predominant light-absorbing organics. HULIS and WISOM showed a noticeable seasonal change in mass absorption efficiency (MAE365), which was highest in winter. Further, HULIS were shown to be less absorbing than those reported for urban sites. The findings in this study provide insights into the contribution of biogenic secondary OA on aerosol property and radiative forcing under varying contributions from other types of OA.

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“…In comparison, the 66 % contribution of OA on reference days decreased to 52 % during SIA_P1 and to 44 % during SIA_P2, and the contribution of SIA increased from 30 % on reference days to 45 % during SIA_P1 and to 53 % during SIA_P2. Meanwhile, the SIA-enhanced periods were also related to a higher PM 2.5 concentration, which increased from 44.1±25.5 µg m −3 during reference days to 131.0 ± 49.6 µg m −3 during SIA_P1 and to 84.9 ± 30.7 µg m −3 during SIA_P2, suggesting an important contribution of SIA to the formation of haze pollution in Xi'an in winter (Zhong et al, 2020;Zhang et al, 2021b). The major difference between SIA-enhanced periods and reference days was the very frequent occurrence of a higher relative humidity (RH>60 %) and ALWC concentration (ALWC>10 µg m −3 ) during SIA_P1 and SIA_P2 compared with reference days (Fig.…”

Section: Overview Of Nr-pm 25 Composition and Oa Sources In Xi'an In ...mentioning

confidence: 91%

“…In addition, Xiao et al (2020) reported that biomass burning sources, especially residential biofuel, can contribute to increased urban NH 3 emissions. Several studies have also indicated that biomass burning is an important source of light-absorbing components in Xi'an (Zhang et al, 2020;Yuan et al, 2021;Zhang et al, 2021b;Li et al, 2022b). Wu et al (2018) revealed that simultaneously elevated RH and anthropogenic secondary inorganic aerosol (SIA) resulted in an abundant aerosol liquid water content (ALWC), which can further facilitate the formation of heavy haze.…”

Section: Introductionmentioning

confidence: 99%

Measurement report: Large contribution of biomass burning and aqueous-phase processes to the wintertime secondary organic aerosol formation in Xi'an, Northwest China

Duan

Huang

et al. 2022

Atmos. Chem. Phys.

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Abstract. Secondary organic aerosol (SOA) plays an important role in particulate air pollution, but its formation mechanism is still not fully understood. The chemical composition of non-refractory particulate matter with a diameter ≤2.5 µm (NR-PM2.5), OA sources, and SOA formation mechanisms were investigated in urban Xi'an during winter 2018. The fractional contribution of SOA to total OA mass (58 %) was larger than primary OA (POA, 42 %). Biomass-burning-influenced oxygenated OA (OOA-BB) was resolved in urban Xi'an and was formed from the photochemical oxidation and aging of biomass burning OA (BBOA). The formation of OOA-BB was more favorable on days with a larger OA fraction and higher BBOA concentration. In comparison, the aqueous-phase processed oxygenated OA (aq-OOA) was more dependent on the secondary inorganic aerosol (SIA) content and aerosol liquid water content (ALWC), and it showed a large increase (to 50 % of OA) during SIA-enhanced periods. Further van Krevelen (VK) diagram analysis suggests that the addition of carboxylic acid groups with fragmentation dominated OA aging on reference days, while the increased aq-OOA contributions during SIA-enhanced periods likely reflect OA evolution due to the addition of alcohol or peroxide groups.

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Light absorption properties and molecular profiles of HULIS in PM2.5 emitted from biomass burning in traditional “Heated Kang” in Northwest China

Cited by 31 publications

References 67 publications

Winter brown carbon over six of China's megacities: light absorption, molecular characterization, and improved source apportionment revealed by multilayer perceptron neural network

Winter brown carbon over six of China's megacities: light absorption, molecular characterization, and improved source apportionment revealed by multilayer perceptron neural network

Abundance, chemical structure, and light absorption properties of humic-like substances (HULIS) and other organic fractions of forest aerosols in Hokkaido

Measurement report: Large contribution of biomass burning and aqueous-phase processes to the wintertime secondary organic aerosol formation in Xi'an, Northwest China

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