Radiative cooling in New York/New Jersey metropolitan areas by wildfire particulate matter emitted from the Canadian wildfires of 2023 DOI Creative Commons
Georgios A. Kelesidis, Constantinos Moularas, Hooman Parhizkar

et al.

Communications Earth & Environment, Journal Year: 2025, Volume and Issue: 6(1)

Published: April 21, 2025

Wildfire particulate matter from Canadian forest fires significantly impacted the air quality in northeastern United States during summer of 2023. Here, we used real-time and time-integrated instrumentation to characterize physicochemical properties radiative effects wildfire reaching metropolitan areas New Jersey/ York this extreme incident. The forcing -352.4 W/m2 derived here based on measured optical explains, some extent, ground level temperature reduction about 3 °C observed City Such negative densely populated megacities may limit natural ventilation, increase residence time background pollutants, exacerbating public health risks. This study highlights importance their potential implications for climate, health.

Language: Английский

Aerosol spectral optical properties in the Paris urban area and its peri-urban and forested surroundings during summer 2022 from ACROSS surface observations DOI Creative Commons
Ludovico Di Antonio, Claudia Di Biagio, Paola Formenti

et al.

Atmospheric chemistry and physics, Journal Year: 2025, Volume and Issue: 25(5), P. 3161 - 3189

Published: March 14, 2025

Abstract. The complex refractive index (CRI; n−ik) and the single scattering albedo (SSA) are key parameters driving aerosol direct radiative effect. Their spatial, temporal, spectral variabilities in anthropogenic–biogenic mixed environments poorly understood. In this study, we retrieve CRI SSA (370–950 nm wavelength range) from situ surface optical measurements number size distribution of submicron aerosols at three sites greater Paris area, representative urban city, as well its peri-urban forested rural environments. Measurements were taken part ACROSS (Atmospheric Chemistry Suburban Forest) campaign June–July 2022 under diversified conditions: (1) two heatwaves leading to high levels, (2) an intermediate period with low concentrations, (3) episode long-range-transported fire emissions. retrieved exhibit urban-to-rural gradient, whose intensity is modulated by weather conditions. A full average 1.41−0.037i (urban), 1.52−0.038i (peri-urban), 1.50−0.025i (rural) retrieved. imaginary (k) increases decreases forest when exposed influence plume. Values k > 0.1 < 0.6 520 related a black carbon mass fraction larger than 10 %. Organic found contribute more 50 % up 17 22 (forest) absorption coefficient 370 nm. value 0.022 (370 nm) was measured site for episode.

Language: Английский

Citations

0
Quantifying densification effects on the morphology of nano-sized carbon black aggregates DOI Creative Commons
Kunfeng Gao, Franz Friebel, Chong‐Wen Zhou

et al.

Powder Technology, Journal Year: 2025, Volume and Issue: unknown, P. 120943 - 120943

Published: March 1, 2025

Language: Английский

Citations

0
A Framework for Quantifying the Size and Fractal Dimension of Compacting Soot Particles DOI Creative Commons
Payton Beeler, Joel C. Corbin, Timothy A. Sipkens

et al.

Environmental Science & Technology, Journal Year: 2025, Volume and Issue: unknown

Published: March 21, 2025

Black carbon (BC) is a strongly absorbing component of atmospheric aerosols that has significant warming effect. BC particles are emitted from combustion sources as open-structured fractal aggregates. After emission, often compacted due to capillary condensation semivolatile vapors form coatings. The addition coatings influences the size and radiative properties BC, but representing these details in transfer models computationally difficult neglected. Laboratory studies have measured restructuring during coating rarely provide information on changes particle shape. Here, we combine laboratory measurements compaction with detailed develop framework for predicting shape function volume ratio, property already tracked large-scale models. predicts mobility diameter dimension throughout root-mean-squared error (RMSE) values less than 6.8 4.3%, respectively. These predicted both coated core. Our proposed will enable more complete representation evolving its lifetime, thereby improving model accuracy at low computational cost.

Language: Английский

Citations

0
Size-resolved measurements of the light absorption properties of soot aerosols from a gas turbine engine DOI Creative Commons

Rym Mehri,

Timothy A. Sipkens, Gregory J. Smallwood

et al.

Applied Physics B, Journal Year: 2025, Volume and Issue: 131(5)

Published: April 9, 2025

Language: Английский

Citations

0
Radiative cooling in New York/New Jersey metropolitan areas by wildfire particulate matter emitted from the Canadian wildfires of 2023 DOI Creative Commons
Georgios A. Kelesidis, Constantinos Moularas, Hooman Parhizkar

et al.

Communications Earth & Environment, Journal Year: 2025, Volume and Issue: 6(1)

Published: April 21, 2025

Wildfire particulate matter from Canadian forest fires significantly impacted the air quality in northeastern United States during summer of 2023. Here, we used real-time and time-integrated instrumentation to characterize physicochemical properties radiative effects wildfire reaching metropolitan areas New Jersey/ York this extreme incident. The forcing -352.4 W/m2 derived here based on measured optical explains, some extent, ground level temperature reduction about 3 °C observed City Such negative densely populated megacities may limit natural ventilation, increase residence time background pollutants, exacerbating public health risks. This study highlights importance their potential implications for climate, health.

Language: Английский

Citations

0