Light-absorbing properties of polar- and non-polar brown carbon fractions of aerosols in Delhi

Atmospheric Research, Год журнала: 2023, Номер 296, С. 107073 - 107073

Опубликована: Окт. 22, 2023

Язык: Английский

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Characterization of water-soluble organic carbon absorption at an urban background site in the south-eastern Iberian Peninsula

Atmospheric Environment, Год журнала: 2024, Номер 324, С. 120435 - 120435

Опубликована: Март 2, 2024

Measurements of absorption coefficients (σap,λ) and carbonaceous components (OC, EC, WSOC levoglucosan) in PM1 were conducted at an urban background site southeastern Spain throughout 2021. The main goal this research was to determine the contribution from different sources light (σWSOC). For this, σBrC,λ values previously obtained. mean BrC total aerosol ∼29% 370 nm, revealing a significant influence study area. Assuming that WIOC, multilinear regression (MLR) model used estimate σWSOC σWIOC. Average (mean ± SD) very similar for both components: σWSOC,370 = 1.6 (±0.7) Mm−1 σWIOC,370 1.9 Mm−1. Finally, PMF technique coupled with MLR analysis identify their contribution. Our findings point biomass burning as dominant source during cold season, ∼37%. Mineral Dust Secondary Nitrate sources, not included due low mass concentrations, accounted percentage period. organic major warm season (∼56%), followed by traffic emissions (∼30%).

Язык: Английский

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Characterizing winter-time brown carbon: Insights into chemical and light-absorption properties in residential and traffic environments

The Science of The Total Environment, Год журнала: 2024, Номер 955, С. 177089 - 177089

Опубликована: Ноя. 1, 2024

Brown carbon (BrC) is an organic aerosol (OA) component that possesses light-absorbing properties in the UV-Vis spectrum, impacting climate. However, current understanding of climate repercussions stemming from BrC emissions remains insufficient due to a lack comprehensive knowledge regarding its chemical makeup, light-absorption, and role atmospheric aging shaping properties. This study investigates PM

Язык: Английский

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Examining the Chemical and Optical Properties of Biomass-burning Aerosols and their Impact on Oxidative Potential

Aerosol and Air Quality Research, Год журнала: 2023, Номер 23(11), С. 230102 - 230102

Опубликована: Янв. 1, 2023

The use of biomass fuels for cooking persists on a large scale in rural areas many low-and middle-income countries, including India. Exposure to emissions from is linked with adverse respiratory health outcomes - likely mediated through the oxidative potential particulate matter (PM). This study aims measure (OP) aerosols kitchens and examine its association aerosol chemical optical properties. Field measurements were conducted collect PM2.5 fuel Maharashtra, Chemical methods employed understand PM characteristics, while OP was measured using Dithiothreitol (DTT) assay. average (± SD) indoor PM2.5, OC, EC, BC, WSOC during 1025 ± 1001, 203 196, 140 133, 112 61, 130 118 μg m-3, respectively, corresponding village outdoor levels ~12.8 (p=0.04), 4.9 (p=0.14), 19.8 (p=0.09), 23.6 (p=0.01), 8.1 (p=0.12) folds (statistical significance difference) lower, respectively. volume normalized (DTTv) 25.3 nmol DTT min-1 which an order magnitude higher redox active than ambient PM. Carbonaceous components correlated positively OP, having significant EC1 (R=0.83), BC (R=0.93), absorption coefficient (WSOC babs, 365) (R=0.97). Our findings suggest that may pose substantial risk population, particular women young children toxicity emitted due soot absorbing OC

Язык: Английский

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Dual carbon isotope-based brown carbon aerosol characteristics at a high-altitude site in the northeastern Himalayas: Role of biomass burning

The Science of The Total Environment, Год журнала: 2023, Номер 912, С. 169451 - 169451

Опубликована: Дек. 22, 2023

Язык: Английский

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