Characterization of brown carbon absorption in different European environments through source contribution analysis

Atmospheric chemistry and physics, Год журнала: 2025, Номер 25(4), С. 2667 - 2694

Опубликована: Фев. 28, 2025

Abstract. Brown carbon (BrC) is a fraction of organic aerosol (OA) that absorbs radiation in the ultraviolet and short visible wavelengths. Its contribution to radiative forcing uncertain due limited knowledge its imaginary refractive index (k). This study investigates variability k for OA from wildfires, residential, shipping, traffic emission sources over Europe. The Multiscale Online Nonhydrostatic Atmosphere Chemistry (MONARCH) model simulated concentrations source contributions, feeding an offline optical tool constrain values at 370 nm. was evaluated against mass chemical speciation monitors (ACSMs) filter sample measurements, as well light absorption measurements nm derived Aethalometer™ 12 sites across Results show MONARCH captures temporal environments (regional, suburban, urban background). Residential emissions are major colder months, while secondary (SOA) dominates warmer periods. Traffic minor primary contributor. Biomass coal combustion significantly influence absorption, with shipping also notable near harbors. Optimizing revealed significant influenced by environmental conditions. Derived biomass burning (0.03 0.13), residential (0.008 (0.005 0.08), 0.07) improved representation compared constant k. Introducing such source-specific constraints innovative approach enhance atmospheric models.

Язык: Английский

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Comparative study of atmospheric brown carbon at Shanghai and the East China Sea: Molecular characterization and optical properties

The Science of The Total Environment, Год журнала: 2024, Номер 941, С. 173782 - 173782

Опубликована: Июнь 5, 2024

Язык: Английский

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Emission of volatile organic compounds from residential biomass burning and their rapid chemical transformations

The Science of The Total Environment, Год журнала: 2023, Номер 903, С. 166592 - 166592

Опубликована: Авг. 26, 2023

Biomass combustion releases a complex array of Volatile Organic Compounds (VOCs) that pose significant challenges to air quality and human health. Although biomass burning has been extensively studied at ecosystem levels, understanding the atmospheric transformation impact on emissions in urban environments remains challenging due sources materials. In this study, we investigate VOC emission rates chemical processing predominantly wood small centre Greece. Ioannina is situated valley within Dinaric Alps experiences intense pollution accumulation during winter its topography high activity. During event days, ambient mixing ratios key species were found be similar those reported for major centres worldwide. Positive matrix factorisation (PMF) analysis revealed was dominant source (>50 %), representing two thirds OH reactivity, which indicates highly reactive mixture. Calculated reactivity ranges from 5 s-1 an unprecedented 278 s-1, averages 93 ± 66 9 PM, indicating presence exceptionally VOCs. The pronounced photochemical formation organic acids coincided with ozone, highlighting significance secondary pollutants poorly ventilated areas. Our findings underscore pressing need transition environmentally friendly energy areas, order improve safeguard public

Язык: Английский

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Impact of peri-urban forest fires on air quality and aerosol optical and chemical properties: The case of the August 2021 wildfires in Athens, Greece

The Science of The Total Environment, Год журнала: 2023, Номер 907, С. 168028 - 168028

Опубликована: Окт. 29, 2023

Язык: Английский

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Space–Time Evaluation of Atmospheric Black Carbon in Chinese Urban Environment: Influence of Land Use and Air Pollution Policies

Earth Systems and Environment, Год журнала: 2024, Номер 8(2), С. 501 - 519

Опубликована: Фев. 28, 2024

Язык: Английский

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Spatiotemporal Gradients of PAH Concentrations in Greek Cities and Associated Exposure Impacts

Toxics, Год журнала: 2024, Номер 12(4), С. 293 - 293

Опубликована: Апрель 16, 2024

To study the spatiotemporal variability of particle-bound polycyclic aromatic hydrocarbons (PAHs) and assess their carcinogenic potential in six contrasting urban environments Greece, a total 305 filter samples were collected analyzed. Sampling sites included variety background, traffic (Athens, Ioannina Heraklion), rural (Xanthi) near-port locations (Piraeus Volos). When considering sum 16 U.S. EPA priority PAHs, as well that EU-proposed members, average concentrations observed across during summer varied moderately (0.4–2.2 ng m−3) independently population each site, with highest values areas Piraeus Volos are affected by port industrial activities. Winter levels significantly higher more spatially variable compared to summer, seasonal enhancement ranging from 7 times 98 Ioannina, indicating large impact PAH emissions residential wood burning. Regarding benzo(a)pyrene (BaP), an IARC Group 1 carcinogen only EU-regulated PAH, winter/summer ratios 24–33 Athens, Volos, Heraklion Xanthi; 60 Piraeus; 480 which is afflicted severe wood-burning pollution events. An excellent correlation was between organic carbon (OC) (BaP) cold period at all (r2 > 0.8) stable BaP/OC slopes (0.09–0.14 × 10−3), highlighting use OC proxy for estimation BaP winter conditions. The identified contrasts, explored first time PAHs such scale Eastern Mediterranean, provide important insights into sources controlling atmospheric conditions reveal deviations exposure risks among cities raise issue environmental injustice on national level.

Язык: Английский

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The role of nitroaromatic compounds (NACs) in constraining BrC absorption in the Indo-Gangetic Plain (IGP)

The Science of The Total Environment, Год журнала: 2024, Номер 917, С. 170523 - 170523

Опубликована: Фев. 1, 2024

Язык: Английский

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Seasonal changes in water-soluble brown carbon (BrC) at Nanling background station in South China

Frontiers in Environmental Science, Год журнала: 2024, Номер 12

Опубликована: Фев. 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.

Язык: Английский

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Variations in optical properties of water- and methanol-soluble organic carbon in PM2.5 in Tianjin and Handan over the Wintertime of 2018–2020

Atmospheric Research, Год журнала: 2024, Номер 303, С. 107332 - 107332

Опубликована: Март 11, 2024

Язык: Английский

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Optical source apportionment of aqueous brown carbon (BrC) on a daytime and nighttime basis in the eastern Indo-Gangetic Plain (IGP) and insights from 13C and 15N isotopic signatures

The Science of The Total Environment, Год журнала: 2023, Номер 894, С. 164872 - 164872

Опубликована: Июнь 19, 2023

Язык: Английский

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