Wet Deposition of Black Carbon: Insights From a Comparative Study of Char/Soot in PM₁₀ and Rainwater

Journal of Geophysical Research Atmospheres, Journal Year: 2025, Volume and Issue: 130(8)

Published: April 23, 2025

Abstract Wet scavenging of black carbon (BC) is essential for evaluating their atmospheric lifetime and radiative forcing. However, it crucial to differentiate BC into char soot subgroups, given significant disparities in physicochemical properties potential impacts. We first conducted a comparative study char/soot PM 10 rainwater, collected over year urban Guangzhou, China. The mean ratio (∼2.5) obviously higher than that rainwater (∼0.8), corresponding wet efficiency soot. Through sequence sampling during individual rainfall events, we further distinguished the contributions in‐cloud below‐cloud scavenging, with predominantly contributed distinct difference between Such behavior would have substantial implications BC, which should be considered future models accurate evaluation its climate impact.

Language: Английский

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Comparing the ice nucleation properties of the kaolin minerals kaolinite and halloysite

Atmospheric chemistry and physics, Journal Year: 2023, Volume and Issue: 23(2), P. 1579 - 1598

Published: Jan. 27, 2023

Abstract. Heterogeneous ice nucleation on dust particles in the atmosphere is a key mechanism for formation clouds. However, conditions of particle surface efficient are poorly understood. In this study, we present results immersion freezing experiments using differential scanning calorimetry emulsified mineral suspensions, involving two chemically identical, but morphologically different, kaolin minerals kaolinite and halloysite. Kaolinite occurs platy morphology, while halloysites form predominantly tubular structures. We investigated six different halloysite samples. Our show that, average, samples not only exhibit higher (IN) activity than also diversity terms onset temperatures heterogeneously frozen fraction. Repeating after shortly milling led to decrease fraction samples, bringing their IN closer that kaolinites. To interpret these findings, were complemented by dynamic vapor sorption (DVS), BET (Brunauer–Emmett–Teller) area measurements, pore melting with slurries, transmission electron microscopy (TEM) before milling. These measurements demonstrate an increase destruction tubes provide evidence influence structure activity. identify OH–Al–O–Si–OH functionalized edges as being most likely site nucleation, high geometric best accounts halloysites. hypothesize stacking layers number stacks platelets affect temperature, thicker having potential freeze water at temperatures. The notion constitute IN-active part further supported comparing montmorillonites feldspars, all which enhanced presence ammonia ammonium-containing solutions. As edge surfaces type have common feature enhancement ammoniated solutions can be explained occurring minerals.

Language: Английский

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Biomass burning in critical fire region over the Maritime Continent from 2012 to 2021: A review of the meteorological influence and cloud-aerosol-radiation interactions

Atmospheric Environment, Journal Year: 2024, Volume and Issue: 320, P. 120324 - 120324

Published: Jan. 2, 2024

Language: Английский

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Unraveling Ice Nucleating Particle Concentration Variability: Insights Into Source Emissions Origin and Parameterizations

Journal of Geophysical Research Atmospheres, Journal Year: 2025, Volume and Issue: 130(8)

Published: April 18, 2025

Abstract Despite having very low atmospheric concentrations, ice‐nucleating particles (INPs) play an important role in the formation of ice crystals at temperatures warmer than −35°C and hence precipitation cycle. Moreover, they tend to have a high spatiotemporal variability. In order understand this variability, long‐term measurements with temporal resolution are essential. This paper presents analysis 3 months online INP (10 min time‐resolved), using PINE cloud chamber (−33°C ≤ T −22°C). Measurements were made from December 2022 March 2023 PUY station (France, 1,465 m a.s.l), site exposed variety air masses including free troposphere conditions. A large part variability concentrations (over four orders magnitude single temperature) can be explained by mass origin. measured for oceanic lower range (from ≈0.1 ≈10 L −1 ). Those continental medium ≈1 ≈100 ) depend on level pollution mass. southern show highest ≈500 mostly amount dust ambient air. conducted during two events revealing over 1000 −32°C. Subsequently, set parameterizations capable tracing developed. will facilitate our understanding impact mixed‐phase properties models.

Language: Английский

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Microfluidic platform for coupled studies of freezing behavior and final effloresced particle morphology in Snomax ^® containing aqueous droplets

Aerosol Science and Technology, Journal Year: 2023, Volume and Issue: 58(4), P. 427 - 439

Published: July 12, 2023

Aerosol physicochemical mixing state, defined as the chemical, phase, and internal structure of a population aerosols, is complex under-characterized regarding its role in atmosphere. The compositional microphysical properties aerosol particle strongly impact atmospheric processes, including water uptake ice nucleation (IN) activities. However, relationship between IN activity microphysics remains underdeveloped, activity, composition, morphology size are highly intercorrelated. In this article, we demonstrate efficacy microfluidic static well trap device for testing both effloresced residual same droplet. We link cationic composition with droplets containing sodium chloride, calcium biological nucleating (INP) Snomax. Finally, show decoupling within droplet chemical systems studied here.

Language: Английский

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Studying Aerosol Hygroscopicity Using Environmental Electron Microscopy

Geophysical monograph, Journal Year: 2024, Volume and Issue: unknown, P. 253 - 260

Published: Dec. 13, 2024

Aerosol particles play an essential role in climate, air quality, and human health. It is therefore vital to understand their composition, morphology, size distribution how these properties influence reactivity the atmosphere. This chapter highlights valuable contributions of environmental scanning transmission electron microscopy (E-SEM/TEM) study aerosol atmosphere, with particular reference aerosol–cloud interactions. begins a brief overview detailing E-SEM/TEM has been instrumental examining interactions between atmospheric gases, particularly water vapor, overcoming limitations inherent conventional online methods. Challenges future prospects are discussed, recognizing potential for developing synergies other analytical tools. collaborative approach crucial answering key questions about interactions, leading way more complete understanding complex processes.

Language: Английский

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Comment on acp-2022-489

Published: Oct. 3, 2022

Abstract. Heterogeneous ice nucleation on dust particles in the atmosphere is a key mechanism for formation clouds. However, conditions of particle surface efficient are poorly understood. In this study, we present results immersion freezing experiments using differential scanning calorimetry emulsified mineral suspensions, involving two chemically identical, but morphologically different, kaolin minerals kaolinite and halloysite. Kaolinite occurs platy morphology, while halloysites form predominantly tubular structures. We investigated six different halloysite samples. Our show that, average, samples not only exhibit higher (IN) activity than also diversity terms onset temperatures heterogeneously frozen fraction. Repeating after shortly milling led to decrease fraction samples, bringing their IN closer that kaolinites. To interpret these findings, were complemented by dynamic vapor sorption (DVS), BET (Brunauer–Emmett–Teller) area measurements, pore melting with slurries, transmission electron microscopy (TEM) before milling. These measurements demonstrate an increase destruction tubes provide evidence influence structure activity. identify OH–Al–O–Si–OH functionalized edges as being most likely site nucleation, high geometric best accounts halloysites. hypothesize stacking layers number stacks platelets affect temperature, thicker having potential freeze water at temperatures. The notion constitute IN-active part further supported comparing montmorillonites feldspars, all which enhanced presence ammonia ammonium-containing solutions. As edge surfaces type have common feature enhancement ammoniated solutions can be explained occurring minerals.

Language: Английский

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Comment on acp-2022-489

Published: Oct. 24, 2022

Abstract. Heterogeneous ice nucleation on dust particles in the atmosphere is a key mechanism for formation clouds. However, conditions of particle surface efficient are poorly understood. In this study, we present results immersion freezing experiments using differential scanning calorimetry emulsified mineral suspensions, involving two chemically identical, but morphologically different, kaolin minerals kaolinite and halloysite. Kaolinite occurs platy morphology, while halloysites form predominantly tubular structures. We investigated six different halloysite samples. Our show that, average, samples not only exhibit higher (IN) activity than also diversity terms onset temperatures heterogeneously frozen fraction. Repeating after shortly milling led to decrease fraction samples, bringing their IN closer that kaolinites. To interpret these findings, were complemented by dynamic vapor sorption (DVS), BET (Brunauer–Emmett–Teller) area measurements, pore melting with slurries, transmission electron microscopy (TEM) before milling. These measurements demonstrate an increase destruction tubes provide evidence influence structure activity. identify OH–Al–O–Si–OH functionalized edges as being most likely site nucleation, high geometric best accounts halloysites. hypothesize stacking layers number stacks platelets affect temperature, thicker having potential freeze water at temperatures. The notion constitute IN-active part further supported comparing montmorillonites feldspars, all which enhanced presence ammonia ammonium-containing solutions. As edge surfaces type have common feature enhancement ammoniated solutions can be explained occurring minerals.

Language: Английский

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Reply on RC1

Published: Dec. 4, 2022

Abstract. Heterogeneous ice nucleation on dust particles in the atmosphere is a key mechanism for formation clouds. However, conditions of particle surface efficient are poorly understood. In this study, we present results immersion freezing experiments using differential scanning calorimetry emulsified mineral suspensions, involving two chemically identical, but morphologically different, kaolin minerals kaolinite and halloysite. Kaolinite occurs platy morphology, while halloysites form predominantly tubular structures. We investigated six different halloysite samples. Our show that, average, samples not only exhibit higher (IN) activity than also diversity terms onset temperatures heterogeneously frozen fraction. Repeating after shortly milling led to decrease fraction samples, bringing their IN closer that kaolinites. To interpret these findings, were complemented by dynamic vapor sorption (DVS), BET (Brunauer–Emmett–Teller) area measurements, pore melting with slurries, transmission electron microscopy (TEM) before milling. These measurements demonstrate an increase destruction tubes provide evidence influence structure activity. identify OH–Al–O–Si–OH functionalized edges as being most likely site nucleation, high geometric best accounts halloysites. hypothesize stacking layers number stacks platelets affect temperature, thicker having potential freeze water at temperatures. The notion constitute IN-active part further supported comparing montmorillonites feldspars, all which enhanced presence ammonia ammonium-containing solutions. As edge surfaces type have common feature enhancement ammoniated solutions can be explained occurring minerals.

Language: Английский

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Reply on RC2

Published: Dec. 4, 2022

Abstract. Heterogeneous ice nucleation on dust particles in the atmosphere is a key mechanism for formation clouds. However, conditions of particle surface efficient are poorly understood. In this study, we present results immersion freezing experiments using differential scanning calorimetry emulsified mineral suspensions, involving two chemically identical, but morphologically different, kaolin minerals kaolinite and halloysite. Kaolinite occurs platy morphology, while halloysites form predominantly tubular structures. We investigated six different halloysite samples. Our show that, average, samples not only exhibit higher (IN) activity than also diversity terms onset temperatures heterogeneously frozen fraction. Repeating after shortly milling led to decrease fraction samples, bringing their IN closer that kaolinites. To interpret these findings, were complemented by dynamic vapor sorption (DVS), BET (Brunauer–Emmett–Teller) area measurements, pore melting with slurries, transmission electron microscopy (TEM) before milling. These measurements demonstrate an increase destruction tubes provide evidence influence structure activity. identify OH–Al–O–Si–OH functionalized edges as being most likely site nucleation, high geometric best accounts halloysites. hypothesize stacking layers number stacks platelets affect temperature, thicker having potential freeze water at temperatures. The notion constitute IN-active part further supported comparing montmorillonites feldspars, all which enhanced presence ammonia ammonium-containing solutions. As edge surfaces type have common feature enhancement ammoniated solutions can be explained occurring minerals.

Language: Английский

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