Comparison of water-soluble and insoluble organic compositions attributing to different light absorption efficiency between residential coal and biomass burning emissions DOI Creative Commons
Lu Zhang, Jin Li, Yaojie Li

et al.

Published: Nov. 13, 2023

Abstract. There are growing concerns about the climate impacts of absorbing organic carbon (also known as Brown Carbon, BrC) in environment, however, chemical composition and association with light absorption ability BrC remain poorly understood. In this study, focusing on one major source BrC, water-soluble water-insoluble (WSOC; WISOC) from residential solid fuel combustions were characterized at molecular level, evaluated for their quantitative relationship mass efficiency (MAE). The MAE values λ=365 nm biomass burning significantly higher than coal combustion smokes. Thousands peaks identified m/z range 150–800, most intense ion 200–500 WSOC 600–800 WISOC, respectively. CHO group was abundant component extracts emissions compared to coals; while sulfur-containing compounds (CHOS+CHONS, SOCs) more WISOC extracts, especially emissions. Emissions CHON positively correlated N content (r=0.936, p<0.05), which explained SOCs predominant flaming phases, seen a positive correlation between modified (MCE) (r=0.750, p<0.05). unique formulas aerosols lower H/C O/C regions unsaturated van Krevelen (VK) diagram. had high fractions condensed aromatics (32–59 %) only 4.3–9.7 % CHOS by larger aromatic compound combustion. values, both (r=0.714, p<0.05) (r=0.929, p<0.001), suggesting abundance variabilities across different fuels.

Language: Английский

Comparative study of atmospheric brown carbon at Shanghai and the East China Sea: Molecular characterization and optical properties DOI
Dongmei Cai, Chunlin Li,

Jingxin Lin

et al.

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 941, P. 173782 - 173782

Published: June 5, 2024

Language: Английский

Citations

7
Molecular compositions and optical properties of water-soluble brown carbon during the autumn and winter in Guangzhou, China DOI
Tan He, Yang Wu, Dian Wang

et al.

Atmospheric Environment, Journal Year: 2022, Volume and Issue: 296, P. 119573 - 119573

Published: Dec. 30, 2022

Language: Английский

Citations

23
Optical properties and molecular composition of wintertime atmospheric water-soluble organic carbon in different coastal cities of eastern China DOI Creative Commons
Haibiao Chen, Caiqing Yan, Qing‐Long Fu

et al.

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 892, P. 164702 - 164702

Published: June 9, 2023

Language: Английский

Citations

14
Aqueous‐Phase Secondary Processes and Meteorological Change Promote the Brown Carbon Formation and Transformation During Haze Events DOI
Hongxing Jiang, Junjie Cai, Xinxin Feng

et al.

Journal of Geophysical Research Atmospheres, Journal Year: 2023, Volume and Issue: 128(16)

Published: Aug. 20, 2023

Abstract The evolution and the impacts of meteorological conditions on brown carbon (BrC) absorption are not understood, which hinders assessment BrC radiative forcing. To address this issue, 1‐hr time‐resolved PM 2.5 samples collected during three haze events in North China Plain prior to COVID‐19 pandemic were used measure optical properties BrC. By coupling excitation‐emission matrix spectroscopy, chemical tracer analysis with multiple model including positive factorization (PMF) a deweather‐random forest model, we found that higher proportion highly oxidized chromophoric components was present water‐soluble than methanol‐soluble BrC, indicating conversion low‐oxidized water‐insoluble into day. results PMF showed aqueous secondary processes major contributor (68% ± 38%), changes such as relative humidity (RH) could significantly lead light‐absorbing capacity especially enhancement for bleaching noon afternoon. We further increased RH increases maximum ∼65%, then decreased when >65%, highlighting important role generation

Language: Английский

Citations

14
Comparison of water-soluble and water-insoluble organic compositions attributing to different light absorption efficiency between residential coal and biomass burning emissions DOI Creative Commons
Lu Zhang, Jin Li, Yaojie Li

et al.

Atmospheric chemistry and physics, Journal Year: 2024, Volume and Issue: 24(10), P. 6323 - 6337

Published: May 29, 2024

Abstract. There are growing concerns about the climate impacts of absorbing organic carbon (also known as brown carbon, BrC) in environment, yet its chemical composition and association with light absorption capabilities remain poorly understood. This study characterized water-soluble water-insoluble (WSOC WIOC) from residential solid fuel combustion at molecular level evaluated their quantitative relationship mass efficiency (MAE). The MAE values λ = 365 nm biomass burning were significantly higher than those coal (p < 0.05). Thousands peaks identified m/z range 150–800, most intense ion occurring between 200–500 for WSOC 600–800 WIOC, respectively. CHO group predominated extract emissions, while sulfur-containing compounds (SOCs) including CHOS CHONS more WIOC extract, particularly emissions. Emissions CHON positively correlated nitrogen content (r 0.936; p 0.05), explaining abundance emissions compared to biomass. SOC predominant during flaming phases, indicated by a positive correlation modified (MCE) 0.750; unique formulas aerosols lower H/C O/C regions, unsaturated van Krevelen (VK) diagram. In contained fractions condensed aromatics (32 %–59 %) only 4.3 %–9.7 % contrast, was larger aromatic compound combustion. Moreover, both 0.714; 0.05) extracts 0.929; 0.001), suggesting that these contributed variabilities across different fuels.

Language: Английский

Citations

5
Seasonal characterization of chemical and optical properties of water-soluble organic aerosol in Beijing DOI
Bo You, Zhi‐Qiang Zhang,

Aodong Du

et al.

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 930, P. 172508 - 172508

Published: April 18, 2024

Language: Английский

Citations

4
Seasonal changes in water-soluble brown carbon (BrC) at Nanling background station in South China DOI Creative Commons
Bolong Zhang, Jiao Tang, Xiaofei Geng

et al.

Frontiers in Environmental Science, Journal Year: 2024, Volume and Issue: 12

Published: Feb. 14, 2024

Brown carbon (BrC) is an important light-absorbing component of organic (OC), causing large uncertainty in aerosol radiative forcing evaluation and being related to health issues as well. Knowledge BrC atmospheric background station beneficial understand its role a changing climate. A year-long sampling campaign was conducted at Nanling get comprehensive knowledge WS-BrC, total seventy-two PM 2.5 samples throughout year were used. Light absorption fluorescence spectra WSOC analyzed synchronously using spectrophotometer. The low levels , OC, elemental (EC) conferred site. optical properties WS-BrC characterized excitation-emission matrix (EEM) spectroscopy. made significant contribution (365 nm, 18% ± 10%) carbonaceous absorption. mass efficiency (MAE) 0.81 0.34 m 2 gC –1 varies among seasons due the different sources or processing. Three EEM fluorescent components identified by parallel factor (PAFAFAC) analysis, including two humic-like substances (HULIS, C1, C2), one phenolic-like component. HULIS accounted for approximately 70% intensities. Primary combustion emissions showed enhanced activity during winter spring seasons, but there no influences on spring. Secondary contributed significantly winter, summer, autumn (all exceeding 50%), except Photooxidation process formation secondary autumn, may be another pathway i.e., ammonia pathway. This study contributes our understanding atmosphere.

Language: Английский

Citations

3
Measurement report: Optical and structural properties of atmospheric water-soluble organic carbon in China – insights from multi-site spectroscopic measurements DOI Creative Commons
Haibiao Chen, Caiqing Yan,

Liubin Huang

et al.

Atmospheric chemistry and physics, Journal Year: 2025, Volume and Issue: 25(6), P. 3647 - 3667

Published: March 27, 2025

Abstract. To understand the spatial variation of optical and structural properties water-soluble brown carbon its influencing factors in China, light absorption, fluorescence, Fourier transform infrared (FTIR) spectrum organic (WSOC) different regions China are measured following same analytical methods. The average absorption coefficients mass efficiencies WSOC at 365 nm (Abs365 MAE365) rank from high to low as northwest > southwest north east regional site, with higher values northern than southern sites inland areas coastal areas. resolved by spectra-based positive matrix factorization model abundance aromatic O−H C=C functional groups determined FTIR both indicate that compounds significant light-absorbing substances have a impact on fluorophores. Multiple linear regression analysis shows fluorophores identified fluorescence spectra combined parallel factor (PARAFAC) contribute about 62 %–93 % all sites, which humic-like substance (HULIS) contributes most, especially highly oxygenated HULIS (29 %–50 %) long emission wavelengths. Combustion source emissions atmospheric chemical processes impacts some sites. Moreover, relative humidity (RH) can also affect MAE365 WSOC, decreasing increase RH when RH<60 remaining relatively unchanged RH>60 %. Taken together, this study promotes better understanding heterogeneity their China.

Language: Английский

Citations

0
Molecular signatures and formation mechanisms of water-soluble chromophores in particulate matter from Karachi in Pakistan DOI
Jiao Tang, Jun Li, Shizhen Zhao

et al.

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 914, P. 169890 - 169890

Published: Jan. 6, 2024

Language: Английский

Citations

3
Nitrogen‐Containing Functional Groups Dominate the Molecular Absorption of Water‐Soluble Humic‐Like Substances in Air From Nanjing, China Revealed by the Machine Learning Combined FT‐ICR‐MS Technique DOI
Yihang Hong, Yanlin Zhang, Mengying Bao

et al.

Journal of Geophysical Research Atmospheres, Journal Year: 2023, Volume and Issue: 128(24)

Published: Dec. 13, 2023

Abstract The light absorption capacity of water‐soluble humic‐like substances (HULIS WS ) at the molecular level is crucial for reducing uncertainties in modeling radiative forcing. This study proposed a machine learning approach to allocate coefficient 365 nm (Abs HULIS into 8084 Fourier transform‐ion cyclotron resonance mass spectrometry (FT‐ICR‐MS) detached markers and their potential functional groups. ML model showed an acceptable uncertainty (<5%) whole Abs value based on prediction errors. results that five critical light‐absorbing molecules (C 4 H 6 O NS, C 8 11 15 3 N 2 , 12 19 21 could explain 74% (±3%) variation winter, whereas no were found summer. Besides, nitrogen‐containing groups dominate (61% ± 8%) near spectrum. work illustrated how affect providing information future research level.

Language: Английский

Citations

2