Matthew Fraund

Nanoscale Chemical Imaging of Soot and Brown Carbon Components in Individual Atmospheric Particles

Steven A. L. Sharpe, Temitope Olayemi, Julius Ese, Seth Koloski et autres

Abstract Biomass-burning aerosols contain complex mixtures of soot carbon (SC), brown carbon (BrC), organic carbon (OC), and inorganic (IN) constituents whose spatial distributions within individual particles strongly influence aerosol optical properties, atmospheric chemistry, and climate impacts. Scanning transmission X-ray microscopy (STXM) coupled …

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Measurement report: Role of organic coating and chemical composition on ice nucleation potential of atmospheric particles in European Arctic

Nurun Nahar Lata, Trung Diep, Stefania Gilardoni, Mauro Mazzola et autres

Abstract. Understanding the ice nucleation (IN) potential of Arctic aerosols is critical for predicting their influence on cloud formation and water cycles in this vulnerable region. This study investigates the role of particle composition, organic coatings, and aerosol sources in modulating IN …

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Stratospheric aerosol perturbation by tropospheric biomass burning and deep convection

Xiaoli Shen, Justin Jacquot, Yaowei Li, Steven Sharpe et autres

The stratosphere is often considered to be dynamically stable with limited vertical exchange; however, episodic deep convection can even transport tropospheric air masses into the upper troposphere (UT) and even across the tropopause into lower stratosphere (LS). We deployed a newly developed …

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Chemical imaging of individual stratospheric particles sampled over North America

Steven Sharpe, Yaowei Li, Sophia Benjemia, Felipe Rivera-Adorno et autres

Chemical imaging was used to examine the morphology, composition, and mixing state of stratospheric particles. The results showed evidence of wildfire-derived black carbon and organic material reaching the upper troposphere and lower stratosphere.

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Supplementary material to "Measurement report: Role of Organic Coating and Chemical Composition on Ice Nucleation Potential of Atmospheric Particles in European Arctic"

Nurun Nahar Lata, Trung Diep, Stefania Gilardoni, Mauro Mazzola et autres

Individual particles were classified based on their elemental composition (as atomic %) obtained from SEM-EDX measurements (Figure S2).Particles containing both phosphorus and potassium ≥ 0.4 at.% were identified as biogenic.The remaining non-biogenic particles were categorized into dust-laden, Na-laden, non-dust, and other groups.Dust-laden …

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Spectro-microscopic analysis of soot particle composition and source attribution

Felipe Rivera-Adorno, Steven Sharpe, Temitope Olayemi, Julius Iruoghene Ese et autres

Ambient soot particles significantly impact Earth’s radiative balance, human health, and atmospheric visibility. Their microstructural properties depend on formation and aging mechanisms, which vary by emission source and atmospheric processes. Hence, accurately identifying sources of soot enhances our understanding of their physicochemical …

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Chemical Imaging of Atmospheric Biomass Burning Particles from North American Wildfires

Felipe Rivera-Adorno, Jay M. Tomlin, Nurun Nahar Lata, Lisa Azzarello et autres

The effects of biomass burning aerosols (BBA) on radiative forcing and cloud formation depend on chemical composition and the internal structures of individual particles within smoke plumes. To improve our understanding of the chemical and physical properties of BBA emitted at different …

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Investigating New Particle Formation and Growth Over an Urban Location in the Eastern Mediterranean

T. C. Ajith, Eli Windwer, Chunlin Li, Zheng Fang et autres

Abstract This study investigates the new particle formation (NPF) events at an urban location in the Eastern Mediterranean. Particle size distribution, particulate chemical composition, and gaseous pollutants were monitored in Rehovot, Israel (31°53″N 34°48″E) during two campaigns: from April 29 to 3 …

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Multimodal Chemical Characterization of Brown Carbon in Atmosphere and Snowpack during SAIL Field Campaign Report

Alexander Laskin, Ryan C. Moffet, Steven Sharpe, Temitope Olayemi et autres

The main goal of this field project was to characterize the chemical and physical properties of light-absorbing particles (LAP) present in the atmosphere and snowpack. The specific field efforts included: 1) online measurement and sampling of light-absorbing particles using a Magee Scientific …

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Estimating viscosity of individual substrate-deposited particles from measurements of their height-to-width ratios

Felipe Rivera-Adorno, Jay M. Tomlin, Matthew Fraund, E. David Morgan et autres

Airborne particles alter the radiative forcing of climate and have further consequences on air visibility, atmospheric chemistry, and human health. Recent studies reported the existence of highly viscous semisolid and even solid amorphous organic aerosol (OA) particles. Particle viscosity has an impact …

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Cloud condensation nuclei activity of internally mixed particle populations at a remote marine free troposphere site in the North Atlantic Ocean

Zezhen Cheng, Megan Morgenstern, Silvia Henning, Bo Zhang et autres

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Cloud Condensation Nuclei Activity of Prevalent Internally Mixed Particles at a Remote Marine Free Troposphere Site in the North Atlantic Ocean

Zezhen Cheng, Megan Morgenstern, Silvia Henning, Bo Zhang et autres

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