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, Год журнала: 2022, Номер 860, С. 160434 - 160434

Опубликована: Ноя. 24, 2022

Язык: Английский

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

Environmental Science & Technology Letters, Год журнала: 2024, Номер 11(2), С. 150 - 157

Опубликована: Янв. 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.

Язык: Английский

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

Environmental Science & Technology, Год журнала: 2022, Номер 56(18), С. 12873 - 12885

Опубликована: Сен. 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

Язык: 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, Год журнала: 2022, Номер 302, С. 134869 - 134869

Опубликована: Май 7, 2022

Язык: 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, Год журнала: 2024, Номер 918, С. 170374 - 170374

Опубликована: Фев. 2, 2024

Язык: 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, Год журнала: 2023, Номер 895, С. 165180 - 165180

Опубликована: Июнь 27, 2023

Язык: Английский

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

Environmental Science Atmospheres, Год журнала: 2023, Номер 3(9), С. 1262 - 1271

Опубликована: Янв. 1, 2023

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

Язык: 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, Год журнала: 2024, Номер 252, С. 119067 - 119067

Опубликована: Май 3, 2024

Язык: 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, Год журнала: 2023, Номер 6(1)

Опубликована: Июль 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.

Язык: 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, Год журнала: 2023, Номер 30(20), С. 58882 - 58906

Опубликована: Март 31, 2023

Язык: Английский

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