Comment on acp-2022-801 DOI Creative Commons

Published: Jan. 12, 2023

Abstract. Traditional animal dung fuel use is a prominent source of brown carbon (BrC) in the Tibetan Plateau (TPL) region. Changes burning conditions, types, and uses fuels areas can lead to considerable uncertainties about molecular absorption properties their radiative forcing influence on BrC. Here, constituents BrC’s chromophoric molecules emitted from residential heating cooking scenarios using were proposed ultra-high performance liquid chromatography-quadrupole time-of-flight mass spectrometry TPL region, China. Our results show that this study release abundant BrC emissions with substantial high when compared those observed bitumite. Particularly, linkage between was quantified by partial least squares regression. Among detected groups, above 70 % N-containing compounds (CHON CHONS) low-oxygen-containing unsaturated aromatic bonds 20.9–27.5 CHO measured combustion samples lies potential chromophores regions. Further, significantly enhanced contribution coefficient (Mbabs) total Mbabs (up 99.7 %) presence both CHON (N2+N4) distinctive characteristics long chains levels unsaturation. Interestingly, identified CHONS markers highly oxygenated double-bonds Mbabs, but rarely produced under insufficient oxygen conditions at high-altitude plateau. Meanwhile, incomplete values integrated simple efficiency thus destroyed radiation balance over

Language: Английский

Molecular insights into the composition, sources, and aging of atmospheric brown carbon DOI Creative Commons
Alexander Laskin, Christopher P. West, Anusha P. S. Hettiyadura

et al.

Chemical Society Reviews, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

The light-absorbing chemical components of atmospheric organic aerosols are commonly referred to as Brown Carbon (BrC), reflecting the characteristic yellowish brown appearance aerosol.

Language: Английский

Citations

4
Enhanced Light Absorption and Elevated Viscosity of Atmospheric Brown Carbon through Evaporation of Volatile Components DOI
Diego Calderon‐Arrieta, Ana C. Morales, Anusha P. S. Hettiyadura

et al.

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(17), P. 7493 - 7504

Published: April 18, 2024

Samples of brown carbon (BrC) material were collected from smoke emissions originating wood pyrolysis experiments, serving as a proxy for BrC representative biomass burning emissions. The acquired samples, referred to "pyrolysis oil (PO

Language: Английский

Citations

9
Singlet Oxygen Seasonality in Aqueous PM10 is Driven by Biomass Burning and Anthropogenic Secondary Organic Aerosol DOI

Sophie Bogler,

Kaspar R. Daellenbach,

David M. Bell

et al.

Environmental Science & Technology, Journal Year: 2022, Volume and Issue: 56(22), P. 15389 - 15397

Published: Oct. 28, 2022

The first excited state of molecular oxygen is singlet-state (1O2), formed by indirect photochemistry chromophoric organic matter. To determine whether 1O2 can be a competitive atmospheric oxidant, we must quantify its production in aerosols (OA). Here, report the spatiotemporal distribution over 1-year dataset PM10 extracts at two locations Switzerland, representing rural and suburban site. Using chemical probe technique, measured steady-state concentrations with seasonality an order magnitude peaking wintertime 4.59 ± 0.01 × 10-13 M quantum yield up to 2%. Next, identified biomass burning anthropogenic secondary OA (SOA) as drivers for formation aqueous using source apportionment data. Importantly, quantity, amount brown carbon present PM10, quality, composition present, influence concentration sensitized each extract. Anthropogenic SOA were 4 times more efficient sensitizing than primary aerosols. Last, developed empirical fit estimate based on components, unlocking ability from existing Overall, likely photo-oxidant since ubiquitous SOA.

Language: Английский

Citations

35
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
Contribution of Carbonyl Chromophores in Secondary Brown Carbon from Nighttime Oxidation of Unsaturated Heterocyclic Volatile Organic Compounds DOI Creative Commons
Kunpeng Chen, Raphael Mayorga, Caitlin Hamilton

et al.

Environmental Science & Technology, Journal Year: 2023, Volume and Issue: 57(48), P. 20085 - 20096

Published: Nov. 20, 2023

The light absorption properties of brown carbon (BrC), which are linked to molecular chromophores, may play a significant role in the Earth's energy budget. While nitroaromatic compounds have been identified as strong chromophores wildfire-driven BrC, other types remain be investigated. Given electron-withdrawing nature carbonyls ubiquitous atmosphere, we characterized carbonyl BrC samples from nighttime oxidation furan and pyrrole derivatives, important but understudied precursors secondary organic aerosols primarily found wildfire emissions. Various were quantified samples, their ultraviolet-visible spectra simulated by using time-dependent density functional theory. Our findings suggest that with bonded nitrogen (i.e., imides amides) derived N-containing heterocyclic substantially contribute absorption. contributed over 40% total at wavelengths below 350 nm above 430 BrC. contributions differed significantly wavelength, highlighting divergent importance different wavelength ranges. Overall, our highlight significance underscore need for further investigation.

Language: Английский

Citations

16
Diversity and function of mountain and polar supraglacial DNA viruses DOI

Yongqin Liu,

Nianzhi Jiao, Kevin Xu Zhong

et al.

Science Bulletin, Journal Year: 2023, Volume and Issue: 68(20), P. 2418 - 2433

Published: Sept. 9, 2023

Language: Английский

Citations

14
A Review on Brown Carbon Aerosol in China: From Molecular Composition to Climate Impact DOI

Xu-bing Cao,

Jiumeng Liu, Yuliang Wu

et al.

Current Pollution Reports, Journal Year: 2024, Volume and Issue: 10(2), P. 326 - 343

Published: Feb. 29, 2024

Language: Английский

Citations

6
Research progress on secondary formation, photosensitive reaction mechanism and human health effects of chromophoric brown carbon DOI

Baihang Chen,

Jiangyao Chen, Guiying Li

et al.

Journal of Environmental Sciences, Journal Year: 2024, Volume and Issue: 151, P. 310 - 330

Published: April 14, 2024

Language: Английский

Citations

5
High-resolution physicochemical dataset of atmospheric aerosols over the Tibetan Plateau and its surroundings DOI Creative Commons
Jianzhong Xu, Xinghua Zhang,

Wenhui Zhao

et al.

Earth system science data, Journal Year: 2024, Volume and Issue: 16(4), P. 1875 - 1900

Published: April 16, 2024

Abstract. Atmospheric aerosol in the Tibetan Plateau (TP) and its surroundings has attracted significant scientific interest recent decades due to notable impacts on regional climatic cryospheric changes, ecological environmental security, hydrological cycle. However, our understanding of atmospheric this remote region is highly limited by scarcity available datasets owing extremely harsh natural conditions. This challenge been mitigated establishing field observatories at typical sites within TP surroundings. A continuous project initiated 2015 aims explore properties sources aerosols, as well their differences, through multiple short-term intensive observations obtained across vast utilizing a suite high-time-resolution online instruments. paper presents systematic hourly scale dataset physicochemical optical eight that derived from project. It includes size-resolved chemical compositions submicron high-resolution mass spectra organic size distributions particle number concentrations, light-scattering light-absorption coefficients, light absorptions attributed different carbonaceous substances including black carbon brown carbon, concentrations cloud condensation nuclei. In brief, aerosols these were all mixed aged, reflecting dominant transport sources. southern exhibited high contributions neutralized bulk relatively capacity, whereas northern region, secondary inorganic species main contributors overall acidic aerosols. Beyond providing insights into differences surroundings, will also benefit simulations radiative forcing evaluations interactions among Earth system components numerical models for region. The are accessible National Cryosphere Desert Data Center, Chinese Academy Sciences (https://doi.org/10.12072/ncdc.NIEER.db2200.2022; Xu, 2022).

Language: Английский

Citations

3
Predictions of the Optical Properties of Brown Carbon Aerosol by Machine Learning with Typical Chromophores DOI
Ying Wang, Ru‐Jin Huang, Haobin Zhong

et al.

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(46), P. 20588 - 20597

Published: Nov. 7, 2024

The linkages between BrC optical properties and chemical composition remain inadequately understood, with quantified chromophores explaining less than 25% of ambient aerosol light absorption. This study characterized 38 typical in aerosols collected Xi'an, absorption contributions to ranging from 1.6 ± 0.3 5.8 2.6% at 365 nm. Based on these chromophores, an interpretable machine learning model the Shapley Additive Explanation (SHAP) method were employed explore relationships composition. attained high accuracy Pearson correlation coefficients (

Language: Английский

Citations

3