Article
Chemistry, Multidisciplinary
Hind A. Al-Abadleh, Fatemeh Motaghedi, Wisam Mohammed, Md Sohel Rana, Kotiba A. Malek, Dewansh Rastogi, Akua A. Asa-Awuku, Marcelo Guzman
Summary: Nitrogen-containing organic carbon (NOC) is an important class of brown carbon (BrC) in atmospheric particles. This study investigates the catalytic role of iron in the dark oxidative oligomerization of o- and p-aminophenols under simulated aerosol and cloud conditions, highlighting the importance of iron redox chemistry in BrC formation.
COMMUNICATIONS CHEMISTRY
(2022)
Article
Engineering, Environmental
Fabian Mahrt, Elli Newman, Yuanzhou Huang, Markus Ammann, Allan K. Bertram
Summary: The research found that internal mixtures of POA and SOA in the atmosphere almost always formed two phases when the O/C ratio of the POA was less than 0.11. When the O/C ratio of the POA was between 0.11 and 0.29, the mixtures mostly resulted in particles with one liquid phase. However, depending on the types of SOA and POA surrogates, two liquid phases were also observed in some cases, and an increase in phase-separated particles was observed when increasing the relative humidity within this O/C range.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Energy & Fuels
Miroslav Kocifaj
Summary: Light scattering by aerosol particles is a significant factor in modulating circumsolar radiation, and its contribution to direct beam irradiance increases with atmospheric turbidity. Non-spherical particles play a special role in shaping the distribution of diffuse light in the solar aureola. Models based on Mie scattering theory underestimate circumsolar irradiance compared to the actual effect of non-spherical particles. Correction factors are introduced to improve the accuracy of the existing models.
Article
Multidisciplinary Sciences
Yuanzhou Huang, Fabian Mahrt, Shaun Xu, Manabu Shiraiwa, Andreas Zuend, Allan K. Bertram
Summary: Individual atmospheric particles can contain mixtures of primary organic aerosol (POA), secondary organic aerosol (SOA), and secondary inorganic aerosol (SIA), with the potential to have three distinct liquid phases. The presence of these phases is influenced by the elemental oxygen-to-carbon (O:C) ratio of the SOA, impacting equilibration timescales and potential effects on cloud formation and atmospheric chemistry.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Environmental Sciences
Yan Peng, Li-Ming Cao, Jing Wei, Yong Cheng, Kuangyou Yu, Ke Du, Xiao-Feng Huang
Summary: This study investigates the evolution of black carbon (BC) particles during atmospheric aging and how atmospheric processing influences their heterogeneities. Field measurements show that BC core size and atmospheric processing are the key factors that drive the heterogeneity evolution of BC-containing particles in real atmosphere.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Meteorology & Atmospheric Sciences
Tang Liu, Yu Xu, Qi-Bin Sun, Hong-Wei Xiao, Ren-Guo Zhu, Chen-Xi Li, Zi-Yue Li, Kai-Qi Zhang, Cheng-Xing Sun, Hua-Yun Xiao
Summary: This study systematically investigated the concentrations, compositions, potential sources, and major atmospheric processes of amines in winter PM2.5 in different regions of China for the first time. The concentrations and compositions of amines in PM2.5 showed significant spatial differences, with diethylamine dominating at the Guangzhou site and methylamine dominating at other sites (Nanjing, Shanghai, Xi'an, Haerbin, and background sites). The influence of coal combustion associated with heating and industry was a typical feature that distinguishes the difference of amine sources between the coastal and northern areas. Moreover, the overall amine abundance at the background site was largely controlled by biogenic sources. Acid-base chemistry and displacement mechanism were tightly associated with the formation of amine salts in PM2.5 at all sites. The atmospheric processes related to hydroxyl radicals (center dot OH) exerted a significant impact on the removal of amines at the Nanjing, Guangzhou, Xi'an, and Haerbin sites. The insignificant photochemical degradation of amines in the Shanghai and background areas was associated with varied amine sources, meteorological conditions, and center dot OH levels. The overall results improve the current understanding on the temporal and spatial variations in the composition, source, and atmospheric process of amines in China.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Article
Engineering, Environmental
Janaina P. Nascimento, Henrique M. J. Barbosa, Alessandro L. Banducci, Luciana V. Rizzo, Angel Liduvino Vara-Vela, Bruno B. Meller, Helber Gomes, Andre Cezar, Marco A. Franco, Milena Ponczek, Stefan Wolff, Megan M. Bela, Paulo Artaxo
Summary: In the Amazon rainforest, anthropogenic atmospheric emissions interact with biogenic emissions and result in high concentrations of ozone and secondary organic aerosols. These high concentrations affect a large primary forested area and atmospheric dynamics and photochemistry play a key role in their production.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Environmental
Peng Ren, Chunle Luo, Hongmei Zhang, Hayley Schiebel, Meredith G. Hastings, Xuchen Wang
Summary: Deposition of atmospheric particulates plays a significant role in transporting materials from land to the ocean, impacting climate and nutrient cycling. This study reveals that old organic carbon (OC) in aerosols contributes significantly to marginal sea sediments, serving as a crucial sink for atmospheric carbon dioxide.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Environmental Sciences
Xu Yu, Yee Ka Wong, Jian Zhen Yu
Summary: This study expanded a new instrumental method for monitoring inorganic nitrogen (IN) and organic nitrogen (ON) in PM2.5 and PM10 samples. The results showed that ON accounted for a significant proportion of total nitrogen in fine and coarse particles, and had potential sources such as sea spray, biological particles, and dust mixed with anthropogenic pollutants.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Environmental
Min Yao, Yue Zhao, Chongxuan Chang, Shunyao Wang, Ziyue Li, Chenxi Li, Arthur W. H. Chan, Huayun Xiao
Summary: This study investigates the reactions between SO2 and POs in monoterpene-derived secondary organic aerosol. The results show that the reactivity of PO-S(IV) is consistent with pure SOA when the particles are phase-separated, but varies substantially when the organic and inorganic phases are miscible. The measured kinetics suggest that the PO-S(IV) reaction is an important sulfate formation pathway in aerosols, with the reaction kinetics dominated by general acid catalysis.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Environmental Sciences
Jack J. Lin, Kamal R. Raj, Stella Wang, Esko Kokkonen, Mikko-Heikki Mikkela, Samuli Urpelainen, Nonne L. Prisle
Summary: Water molecules adsorb onto inorganic sodium chloride and organic malonic acid and sucrose nanoparticles at low relative humidities, with malonic acid particles showing clear changes in surface chemical composition and environment. This suggests that water uptake by aerosol particles could impact atmospheric chemistry even at low relative humidities, highlighting the importance of studying surface chemical changes using techniques like APXPS.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2021)
Article
Engineering, Environmental
Yiming Qin, Jianhuai Ye, Paul Ohno, Jinghao Zhai, Yuemei Han, Pengfei Liu, Junfeng Wang, Rahul A. Zaveri, Scot T. Martin
Summary: The influence of relative humidity on the condensational growth of organic aerosol particles was investigated in this study. Higher RH resulted in faster particle growth, with the particle growth being influenced by factors such as diffusivities within the particles.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Keda Zhao, Minjie Li, Lixia Zhao, Nan Sang, Liang-Hong Guo
Summary: According to the experimental results, carbon black particles contribute the most to ROS generation, with small particles being particularly significant. Mitochondria were found to be a damaged organelle, and both naked and BaP-coated CB affected mitochondrial function.
ENVIRONMENTAL SCIENCE-NANO
(2021)
Article
Engineering, Environmental
Weihan Li, Mikinori Kuwata
Summary: Acidity is an important property of atmospheric aerosol particles, but there is currently no method available for measuring the pH of submicron particles in suspension. This study developed a fluorescence-based method using an aerosol fluorescence cell (AFC) to quantify the pH of aerosol particles in a continuous flow. The AFC method showed good agreement with pH indicator papers and can be applied to submicron particles of 80 nm in diameter.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Review
Engineering, Chemical
Zongwei Gan, Yuzhong Li, Xiaoyu Zhang, Maofeng Nie, Hongwei Zhang
Summary: This study introduces the Stefan flow mechanism and different theoretical models in particle collection. It points out the differences between theoretical calculations and experimental results on the impact of phoretic forces on particle collection, discussing the variations from the perspective of Stefan flow. The study also emphasizes the potential importance of Stefan flow on condensing surfaces for improving particle collection efficiency.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Construction & Building Technology
Lucas B. Algrim, Demetrios Pagonis, Joost A. de Gouw, Jose L. Jimenez, Paul J. Ziemann
Article
Chemistry, Multidisciplinary
Julia G. Bakker-Arkema, Paul J. Ziemann
ACS EARTH AND SPACE CHEMISTRY
(2020)
Article
Engineering, Chemical
Zachary Finewax, Jose L. Jimenez, Paul J. Ziemann
AEROSOL SCIENCE AND TECHNOLOGY
(2020)
Article
Engineering, Environmental
Xiaoxi Liu, Douglas A. Day, Jordan E. Krechmer, Paul J. Ziemann, Jose L. Jimenez
Summary: Nonideal molecular interactions in aerosol particles affect the distribution of semivolatile organic compounds (SVOCs). This study quantifies the activity coefficients (gamma) of individual organic compounds in different atmospheric mixtures by measuring the isothermal evaporation of secondary organic aerosols (SOA) formed in an environmental chamber. The results show that the gamma of bulk SOA in complex atmospheric mixtures can be influenced by varying polarities of organic seeds and SOA.
ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Julia G. Bakker-Arkema, Paul J. Ziemann
Summary: Environmental chamber studies are essential for measuring reaction product yields and secondary organic aerosols formed from the oxidation of volatile organic compounds to develop atmospheric chemistry models. These measurements are challenging due to various potential sources of errors that need careful consideration and mitigation.
ACS EARTH AND SPACE CHEMISTRY
(2021)
Article
Chemistry, Physical
Julia G. Bakker-Arkema, Paul J. Ziemann
Summary: The reactions of 1-tetradecene and 1-pentadecene with OH radicals in the presence of NOx were investigated in environmental chamber experiments. The measured molar yields of products formed were used to calculate branching ratios and to achieve a complete gas-phase reaction mechanism for 1-alkenes.
JOURNAL OF PHYSICAL CHEMISTRY A
(2021)
Article
Chemistry, Multidisciplinary
Derek J. Price, Douglas A. Day, Demetrios Pagonis, Harald Stark, Anne Handschy, Lucas B. Algrim, Shelly L. Miller, Joost A. de Gouw, Paul J. Ziemann, Jose L. Jimenez
Summary: Indoor gases in an art museum were analyzed using different instruments, revealing multiple factors affecting the generation of organic carbon. Some factors were related to human occupancy, some to building materials, and others to emissions after painting in the gallery.
ACS EARTH AND SPACE CHEMISTRY
(2021)
Editorial Material
Construction & Building Technology
Jonathan P. D. Abbatt, Glenn C. Morrison, Vicki H. Grassian, Manabu Shiraiwa, Charles J. Weschler, Paul J. Ziemann
Article
Meteorology & Atmospheric Sciences
Sabin Kasparoglu, Russell Perkins, Paul J. Ziemann, Paul J. DeMott, Sonia M. Kreidenweis, Zachary Finewax, Benjamin L. Deming, Marla P. DeVault, Markus D. Petters
Summary: This study presents measurements of the ice nucleating ability of secondary organic material at low temperatures and high ice saturation, and finds that heterogeneous ice nucleation of glassy secondary organic materials is likely uncommon.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2022)
Article
Chemistry, Multidisciplinary
Marla P. DeVault, Anna C. Ziola, Paul J. Ziemann
Summary: Biogenic sources, particularly monoterpenes, are the main contributors to volatile organic compound (VOCs) emissions to the atmosphere. The reaction between monoterpenes and oxidants (such as OH radicals, NO3 radicals, or O-3) leads to the formation of oxidized products, some of which can form secondary organic aerosol (SOA) particles. This study investigates the reaction between NO3 radicals and five different monoterpenes, comparing their gas- and particle-phase products. The results provide insights into the role of molecular structure in VOC oxidation and particle-phase accretion reactions.
ACS EARTH AND SPACE CHEMISTRY
(2022)
Article
Engineering, Environmental
Alexander Moravek, Trevor C. VandenBoer, Zachary Finewax, Demetrios Pagonis, Benjamin A. Nault, Wyatt L. Brown, Douglas A. Day, Anne V. Handschy, Harald Stark, Paul Ziemann, Jose L. Jimenez, Joost A. de Gouw, Cora J. Young
Summary: Indoor gas-phase radical sources are complex, with cleaning agents being a potential important source and chlorine atoms possibly generated in low-light indoor environments. Nitrate radicals may persist in indoor environments, with loss rates dominated by bimolecular reactions. Indoor and outdoor environments may interact, resulting in additional reactive chlorine.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Physical
Marla P. DeVault, Anna C. Ziola, Paul J. Ziemann
Summary: The oxidation of VOCs leads to the formation of ozone and SOA particles, which have significant impacts on air quality and climate. This study investigates the reactions of five biogenic monoterpenes with OH radicals and develops mechanisms to explain their formation. The results provide insights into the impact of VOC structure on the amount and composition of SOA formed by atmospheric oxidation, which influence aerosol properties.
JOURNAL OF PHYSICAL CHEMISTRY A
(2022)
Article
Meteorology & Atmospheric Sciences
Megan S. Claflin, Demetrios Pagonis, Zachary Finewax, Anne Handschy, Douglas A. Day, Wyatt L. Brown, John T. Jayne, Douglas R. Worsnop, Jose L. Jimenez, Paul J. Ziemann, Joost de Gouw, Brian M. Lerner
Summary: The study presents a field-deployable gas chromatograph with thermal desorption preconcentration for in situ measurements of volatile organic compounds. The system demonstrated fast time-response data acquisition, molecular speciation, and high-resolution mass spectral information for each resolved GC peak. Results show successful identification and quantification of a range of VOCs in indoor environments, suggesting the production of DMSD from humidity-dependent heterogeneous reactions on surfaces.
ATMOSPHERIC MEASUREMENT TECHNIQUES
(2021)
Article
Environmental Sciences
Benjamin L. Deming, Paul J. Ziemann
Summary: The partitioning of sulfuric acid and nitric acid between aqueous and organic phases may play a role in acid catalysis of organic reactions, depending on the O:C ratio and water content of the organic phase. The addition of ammonium sulfate can lead to an increase or decrease in the partitioning of sulfuric acid to the organic phase, depending on the balance of HSO4- concentration and water content of the organic phase.
ENVIRONMENTAL SCIENCE-ATMOSPHERES
(2021)