Brown carbon absorption and radiative effects under intense residential wood burning conditions in Southeastern Europe: New insights into the abundance and absorptivity of methanol-soluble organic aerosols

The Science of The Total Environment, Journal Year: 2022, Volume and Issue: 860, P. 160434 - 160434

Published: Nov. 24, 2022

Language: Английский

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Wintertime Heavy Haze Episodes in Northeast China Driven by Agricultural Fire Emissions

Environmental Science & Technology Letters, Journal Year: 2024, Volume and Issue: 11(2), P. 150 - 157

Published: Jan. 22, 2024

Heavy haze events occur frequently over northeast China during the winter, despite successful implementation of Clean Air Act, which primarily targets fossil fuel sources, in recent years. Agricultural fires have been suggested as one main causes these episodes. However, their regional contribution to fine particulate matter (PM2.5) pollution has not systematically evaluated. In this study, we use GEOS-Chem model investigate role agricultural heavy episodes from December 2018 March 2019 Heilongjiang province. Our results show significant discrepancies between simulated and observed PM2.5 concentrations severe days. By increasing fire emissions GFED4s inventory by a factor ∼23, are able better replicate model, indicating under-representation inventory. Furthermore, baseline simulation overestimates black carbon organic ratio Harbin, suggesting biased emission specified assessment underscores that agriculture constitute cause extreme study period, strictly implemented ban would improve air quality with substantial health benefits.

Language: Английский

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Connecting the Light Absorption of Atmospheric Organic Aerosols with Oxidation State and Polarity

Environmental Science & Technology, Journal Year: 2022, Volume and Issue: 56(18), P. 12873 - 12885

Published: Sept. 9, 2022

The light-absorbing organic aerosol (OA) constitutes an important fraction of absorbing components, counteracting major cooling effect aerosols to climate. mechanisms in linking the complex and changeable chemistry OA with its properties remain be elucidated. Here, by using solvent extraction, ambient from urban environment was fractionated according polarity, which further nebulized online characterized compositions properties. Water extracted high-polar compounds a significantly higher oxygen carbon ratio (O/C) than methanol extracts. A transition O/C about 0.6 found, below above enhancement reduction absorptivity were observed increasing O/C, occurring on less polar high compounds, respectively. In particular, co-increase nitrogen elements suggests role nitrogen-containing functional groups enhancing (e.g., forming aromatics), while oxidation (O/C > 0.6) likely led fragmentation bleaching chromophores. results here may reconcile previous observations darkening or whitening chromophores brown carbon, parametrization has potential link changing polarity

Language: Английский

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Spectral characteristics of dissolved organic carbon (DOC) derived from biomass pyrolysis: Biochar-derived DOC versus smoke-derived DOC, and their differences from natural DOC

Chemosphere, Journal Year: 2022, Volume and Issue: 302, P. 134869 - 134869

Published: May 7, 2022

Language: Английский

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Light absorption enhancement of black carbon and its impact factors during winter in a megacity of the Sichuan Basin, China

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 918, P. 170374 - 170374

Published: Feb. 2, 2024

Language: Английский

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Water-soluble organic carbon (WSOC) from vegetation fire and its differences from WSOC in natural media: Spectral comparison and self-organizing maps (SOM) classification

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 895, P. 165180 - 165180

Published: June 27, 2023

Language: Английский

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Brown carbon absorptivity in fresh wildfire smoke: associations with volatility and chemical compound groups

Environmental Science Atmospheres, Journal Year: 2023, Volume and Issue: 3(9), P. 1262 - 1271

Published: Jan. 1, 2023

Brown carbon light absorptivity is associated with organic aerosol volatility and elemental concentrations.

Language: Английский

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Seasonal variations and sources of atmospheric EPFRs in a megacity in severe cold region: Implications for the influence of strong coal and biomass combustion

Environmental Research, Journal Year: 2024, Volume and Issue: 252, P. 119067 - 119067

Published: May 3, 2024

Language: Английский

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Combined influences of sources and atmospheric bleaching on light absorption of water-soluble brown carbon aerosols

npj Climate and Atmospheric Science, Journal Year: 2023, Volume and Issue: 6(1)

Published: July 29, 2023

Abstract Light-absorbing Brown Carbon (BrC) aerosols partially offset the overall climate-cooling of aerosols. However, evolution BrC light-absorption during atmospheric transport is poorly constrained. Here, we utilize optical properties, ageing-diagnostic δ 13 C-BrC and time to deduce that mass absorption cross-section (MAC WS-BrC ) decreasing by ~50% long-range oversea transport, resulting in a first-order bleaching rate 0.24 day ‒1 3-day transit from continental East Asia south-east Yellow Sea receptor. A modern 14 C signal points strong inverse correlation between age source material. Combining this with results for South reveals striking agreement these two major-emission regions rapid photobleaching higher intrinsic absorptivity stemming biomass burning. The consistency parameters constrained independently outflows both indicates weakening light absorption, thus primarily related photochemical processes rather than sources, likely ubiquitous phenomenon.

Language: Английский

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Synergistic interactions of fine particles and radiative effects in modulating urban heat islands during winter haze event in a cold megacity of Northeast China

Environmental Science and Pollution Research, Journal Year: 2023, Volume and Issue: 30(20), P. 58882 - 58906

Published: March 31, 2023

Language: Английский

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