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1. Aerosol Hygroscopicity and Surface-Active Coverage for the Droplet Growth of Aerosol Mixtures

   https://doi.org/10.1021/acsestair.4c00303  

   Ferdousi-Rokib, Nahin; A_Malek, Kotiba; Mitchell, Ian; M_Fierce, Laura; Asa-Awuku, Akua_A (July 2025, ACS ES&T Air)
2. Remote Aerosol Simulated During the Atmospheric Tomography (ATom) Campaign and Implications for Aerosol Lifetime

   https://doi.org/10.1029/2022JD036524  

   Gao, Chloe Yuchao; Heald, Colette L.; Katich, Joseph M.; Luo, Gan; Yu, Fangqun (November 2022, Journal of Geophysical Research: Atmospheres)

   Abstract We investigate and assess how well a global chemical transport model (GEOS‐Chem) simulates submicron aerosol mass concentrations in the remote troposphere. The simulated speciated aerosol (organic aerosol (OA), black carbon, sulfate, nitrate, and ammonium) mass concentrations are evaluated against airborne observations made during all four seasons of the NASA Atmospheric Tomography Mission (ATom) deployments over the remote Pacific and Atlantic Oceans. Such measurements over pristine environments offer fresh insights into the spatial (Northern [NH] and Southern Hemispheres [SH], Atlantic, and Pacific Oceans) and temporal (all seasons) variability in aerosol composition and lifetime, away from continental sources. The model captures the dominance of fine OA and sulfate aerosol mass concentrations in all seasons. There is a high bias across all species in the ATom‐2 (NH winter) simulations; implementing recent updates to the wet scavenging parameterization improves our simulations, eliminating the large ATom‐2 (NH winter) bias, improving the ATom‐1 (NH summer) and ATom‐3 (NH fall) simulations, but producing a model underestimate in aerosol mass concentrations for the ATom‐4 (NH spring) simulations. Following the wet scavenging updates, simulated global annual mean aerosol lifetimes vary from 1.9 to 4.0 days, depending on species. Aerosol lifetimes in each hemisphere vary by season, and are longest for carbonaceous aerosol during the southern hemispheric fire season. The updated wet scavenging parameterization brings simulated concentrations closer to observations and reduces global aerosol lifetime for all species, indicating the sensitivity of global aerosol lifetime and burden to wet removal processes. 

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3. The color of aerosol particles

   https://doi.org/10.1038/s41598-023-28823-6  

   Giri, Ramesh; Berg, Matthew J. (December 2023, Scientific Reports)

   Abstract Digital in-line holography (DIH) is an established method to image small particles in a manner where image reconstruction is performed computationally post-measurement. This ability renders it ideal for aerosol characterization, where particle collection or confinement is often difficult, if not impossible. Conventional DIH provides a gray-scale image akin to a particle’s silhouette, and while it gives the particle size and shape, there is little information about the particle material. Based on the recognition that the spectral reflectance of a surface is partly determined by the material, we demonstrate a method to image free-flowing particles with DIH in color with the eventual aim to differentiate materials based on the observed color. Holograms formed by the weak backscattered light from individual particles illuminated by red, green, and blue lasers are recorded by a color sensor. Images are reconstructed from the holograms and then layered to form a color image, the color content of which is quantified by chromaticity analysis to establish a representative signature. A variety of mineral dust aerosols are studied where the different signatures suggest the possibility to differentiate particle material. The ability of the method to resolve the inhomogeneous composition within a single particle in some cases is shown as well. 

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4. Multifaceted aerosol effects on precipitation

   https://doi.org/10.1038/s41561-024-01482-6  

   Stier, Philip; van_den_Heever, Susan C; Christensen, Matthew W; Gryspeerdt, Edward; Dagan, Guy; Saleeby, Stephen M; Bollasina, Massimo; Donner, Leo; Emanuel, Kerry; Ekman, Annica_M L; et al (August 2024, Nature Geoscience)
5. Secondary Marine Aerosol Plays a Dominant Role over Primary Sea Spray Aerosol in Cloud Formation

   https://doi.org/10.1021/acscentsci.0c00793  

   Mayer, Kathryn J.; Wang, Xiaofei; Santander, Mitchell V.; Mitts, Brock A.; Sauer, Jonathan S.; Sultana, Camille M.; Cappa, Christopher D.; Prather, Kimberly A. (December 2020, ACS Central Science)

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