Article
Engineering, Environmental
Yonghong Wang, Petri Clusius, Chao Yan, Kaspar Dallenbach, Rujing Yin, Mingyi Wang, Xu-Cheng He, Biwu Chu, Yiqun Lu, Lubna Dada, Juha Kangasluoma, Pekka Rantala, Chenjuan Deng, Zhuohui Lin, Weigang Wang, Lei Yao, Xiaolong Fan, Wei Du, Jing Cai, Liine Heikkinen, Yee Jun Tham, Qiaozhi Zha, Zhenhao Ling, Heikki Junninen, Tuukka Petaja, Maofa Ge, Yuesi Wang, Hong He, Douglas R. Worsnop, Veli-Matti Kerminen, Federico Bianchi, Lin Wang, Jingkun Jiang, Yongchun Liu, Michael Boy, Mikael Ehn, Neil M. Donahue, Markku Kulmala
Summary: This study conducted simultaneous measurements in Beijing, showing that the condensation of OOMs explains a significant portion of organic aerosol mass growth, especially during severe haze episodes. These novel results provide a quantitative molecular connection from anthropogenic emissions to haze formation.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Meteorology & Atmospheric Sciences
Liqing Wu, Zhenhao Ling, Min Shao, Huan Liu, Sihua Lu, Shengzhen Zhou, Junchen Guo, Jingying Mao, Jian Hang, Xuemei Wang
Summary: S/IVOCs play a crucial role in the formation of secondary organic aerosols (SOA) in China, with SOA concentrations being highly sensitive to S/IVOC emissions. Upgrading the S/IVOC emission inventory and chemical evolution parameterization in the WRF-Chem model has improved the model's ability to resolve observed SOA concentrations, but there are still discrepancies between simulation and observation. Additionally, SOA concentrations in China are predominantly influenced by S/IVOC emissions compared to other precursor parameters.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2021)
Article
Engineering, Environmental
Linyu Gao, Angela Buchholz, Zijun Li, Junwei Song, Magdalena Vallon, Feng Jiang, Ottmar Mohler, Thomas Leisner, Harald Saathoff
Summary: We investigated the secondary organic aerosol (SOA) generated from the ozonolysis of β-caryophyllene over a wide range of temperatures (213-313 K) and found a nonmonotonic dependence of particle volatility on formation temperature, primarily due to temperature-dependent formation pathways of β-caryophyllene oxidation products. Positive matrix factorization (PMF) was used to deconvolute the detected SOA products and revealed different compound groups with varying volatilities, providing new insights into the temperature-dependent formation mechanisms of β-caryophyllene-derived SOA particles.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Linyu Gao, Angela Buchholz, Zijun Li, Junwei Song, Magdalena Vallon, Feng Jiang, Ottmar Mohler, Thomas Leisner, Harald Saathoff
Summary: "We investigated the secondary organic aerosol (SOA) formed from the oxidation of beta-caryophyllene at different tropospheric temperatures. Positive matrix factorization (PMF) analysis was used to separate the SOA products detected by a chemical ionization mass spectrometer (FIGAERO-CIMS). We observed a nonmonotonic dependence of particle volatility on formation temperature due to temperature-dependent formation pathways. The PMF analysis grouped the detected ions into 11 compound groups that act as indicators for the underlying formation mechanisms."
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Environmental Sciences
Hyun Gu Kang, Youngjin Kim, Sonya Collier, Qi Zhang, Hwajin Kim
Summary: This study measured the volatility of submicron ambient organic aerosol in Seoul in 2019 and compared it with reference data used in air quality models, revealing a significant discrepancy between the two. The results suggest the need for modeling studies to investigate the impact of this discrepancy on model outcomes, and highlight the importance of addressing limitations caused by wall losses and incomplete modeling parameters in chamber experiments aiming to determine volatility basis sets.
ENVIRONMENTAL POLLUTION
(2022)
Article
Environmental Sciences
Manpreet Takhar, Yunchun Li, Arthur W. H. Chan
Summary: This study investigated the atmospheric evolution of cooking emissions and found that fragmentation reactions are key processes in the oxidative aging of cooking emissions. The results suggest that aldehyde precursors play a significant role in the formation and oxidation of secondary organic aerosols (SOA).
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2021)
Article
Environmental Sciences
Yuxuan Wang, Nan Lin, Wei Li, Alex Guenther, Joey C. Y. Lam, Amos P. K. Tai, Mark J. Potosnak, Roger Seco
Summary: This study investigates the impact of drought stress on isoprene emissions in the southeastern United States using drought severity index and satellite observations. The study develops a drought stress algorithm and finds that isoprene emissions decrease under drought conditions. This research is important for improving our understanding of biogenic emissions under stressed conditions.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2022)
Article
Engineering, Environmental
Fobang Liu, Taekyu Joo, Jenna C. Ditto, Maria G. Saavedra, Masayuki Takeuchi, Alexandra J. Boris, Yuhan Yang, Rodney J. Weber, Ann M. Dillner, Drew R. Gentner, Nga L. Ng
Summary: Exposure to PM2.5 is associated with millions of premature deaths annually. The overproduction of reactive oxygen species (ROS) through oxidative stress is a possible mechanism for PM2.5-induced health effects. In this study, the authors found that oxygenated organic aerosol (OOA), particularly more-oxidized OOA, is the main type of organic aerosol associated with cellular ROS production. They also identified highly unsaturated species with carbon-oxygen double bonds and aromatic rings in OOA as major contributors to cellular ROS production. These findings highlight the importance of understanding the sources and chemical characteristics of ambient OA in formulating strategies to mitigate the health impacts of PM2.5.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Environmental Sciences
Hua Fang, Shilu Luo, Xiaoqing Huang, Xuewei Fu, Shaoxuan Xiao, Jianqiang Zeng, Jun Wang, Yanli Zhang, Xinming Wang
Summary: This study conducted a field campaign in Guangzhou to characterize ambient levels of Naphthalene and methylnaphthalenes, finding that about 60% of Nap + MN were degraded during photochemical aging. During the photochemically active period, Nap and MN could contribute 12.4% of estimated SOA formed from single-ring aromatics. Source apportioning revealed that gasoline exhaust was the largest source of Nap and MN, followed by biomass/coal burning, diesel exhaust, and industrial emission.
ATMOSPHERIC ENVIRONMENT
(2021)
Article
Environmental Sciences
Yawen Liu, Yaman Liu, Minghuai Wang, Xinyi Dong, Yiqi Zheng, Manish Shrivastava, Yun Qian, Heming Bai, Xiao Li, Xiu-Qun Yang
Summary: A substantial decline of summertime aerosol loading aloft over the southeastern US in recent decades due to reduced anthropogenic aerosols has been identified. This interaction leads to a stronger decline in column-integrated aerosol optical depth and a greater increase in radiative fluxes over the southeastern than northeastern US. The anthropogenic-biogenic interaction explains more than 60% of the increasing trend in clear-sky surface downward radiative fluxes, with implications for achieving the Paris Agreement temperature targets.
ENVIRONMENTAL RESEARCH LETTERS
(2021)
Article
Multidisciplinary Sciences
Siddharth Iyer, Matti P. Rissanen, Rashid Valiev, Shawon Barua, Jordan E. Krechmer, Joel Thornton, Mikael Ehn, Theo Kurten
Summary: Oxidation of volatile organic compounds leads to aerosol formation in the atmosphere, but the mechanism of some fast reactions is still unclear. The authors, using quantum chemical modelling and experiments, reveal that in key monoterpenes the cyclobutyl ring that would hinder the reactivity is broken in the early exothermic steps of the reaction.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Liudongqing Yang, Sri Hapsari Budisulistiorini, Guorong Chen, Xianfeng Wang, Mikinori Kuwata
Summary: This study developed a framework to investigate the interrelationships among volatility, water solubility, and molecular weight of organic aerosol. The analysis of aerosol samples collected at Singapore validated the newly developed idea on the molecular weight distributions for water-soluble and water-insoluble organic matter. The results suggest that highly polar organic matter has relatively small molecular weight and higher optical properties.
ACS EARTH AND SPACE CHEMISTRY
(2021)
Article
Engineering, Environmental
Shan Zhou, Fangzhou Guo, Chun-Ying Chao, Subin Yoon, Sergio L. Alvarez, Sujan Shrestha, James H. Flynn III, Sascha Usenko, Rebecca J. Sheesley, Robert J. Griffin
Summary: In Spring 2021, we conducted measurements of submicron aerosols (PM1) at a beachfront site in Texas to understand the composition and factors influencing the background aerosols advecting into Texas. Our observations revealed that the marine background aerosols from the Gulf of Mexico were highly processed and acidic, with sulfate being the most abundant component (57% of total PM1 mass). These aerosol characteristics were similar to those observed in other marine locations worldwide. However, the Gulf background aerosols were significantly more polluted compared to other clean marine atmospheres. Anthropogenic shipping emissions over the Gulf of Mexico were found to contribute to 78.3% of the total measured background sulfate in the air. During haze episodes, we observed elevated concentrations of sulfate, organosulfates, and secondary organic aerosol associated with sulfuric acid in the air mass from the Gulf. Our analysis suggests that aqueous oxidation of shipping emissions by peroxides might be an important pathway for the rapid production of acidic sulfate and organosulfates during these haze episodes under acidic conditions.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Environmental Sciences
Weiqi Xu, Chun Chen, Yanmei Qiu, Ying Li, Zhiqiang Zhang, Eleni Karnezi, Spyros N. Pandis, Conghui Xie, Zhijie Li, Jiaxing Sun, Nan Ma, Wanyun Xu, Pingqing Fu, Zifa Wang, Jiang Zhu, Douglas R. Worsnop, Nga Lee Ng, Yele Sun
Summary: The study reveals that volatility and viscosity of aerosols in the North China Plain are significantly impacted by various factors, leading to differences in composition and formation pathways among different organic aerosol factors. The results suggest that kinetically limited gas-particle partitioning may play a crucial role in simulating secondary organic aerosol formation in the region.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2021)
Article
Engineering, Environmental
Catherine G. Masoud, Mrinali Modi, Dongyu S. Wang, Lea Hildebrandt Ruiz
Summary: Fine particulate matter (PM2.5) is an important indicator of urban air quality. Recent studies have found elevated concentrations of reactive chlorine species in inland and urban regions, which contribute to the formation of secondary organic aerosols (SOA) and particulate chlorides. The oxidation of isoprene by chlorine has been found to produce SOA under pristine conditions, but the effects of anthropogenic influences, such as nitrogen oxides (NOx), have not been explored. This study investigates the reactions between chlorine and isoprene under low- and high-NOx conditions, and finds that the secondary OH-isoprene chemistry is significantly enhanced under high-NOx conditions, leading to the suppression of organic chloride formation.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Physical
Lauri Franzon, Jari Peltola, Rashid Valiev, Niko Vuorio, Theo Kurten, Arkke Eskola
Summary: Direct kinetic measurements were performed on the reactions of CH2OO + RCN (R = H, CH3, C2H5) in the temperature and pressure ranges of 233-360 K and 10-250 Torr, respectively, using time-resolved UV-absorption spectroscopy. Chloroiodomethane (CH2ICl) was used as a photolytic precursor to produce CH2OO through its photolysis in the presence of O2 at 193 nm. The observed bimolecular rate coefficients for the reactions of CH2OO with HCN, CH3CN, and C2H5CN at 296 K were determined to be (2.22 +/- 0.65) x 10-14 cm3 molecule-1 s-1, (1.02 +/- 0.10) x 10-14 cm3 molecule-1 s-1, and (2.55 +/- 0.13) x 10-14 cm3 molecule-1 s-1, respectively, indicating that the reaction with CH2OO can be a significant degradation pathway for nitriles in the atmosphere. Both the temperature and pressure dependencies of all the reactions were found to be negligible in the studied conditions. Quantum chemical calculations and master equation modeling results suggested that the lowest-energy reaction path of CH2OO + RCN led to the formation of a 1,2,4-dioxazole compound through ring closure. Subsequent decomposition of 1,2,4-dioxazole could generate important atmospheric end products such as CH2O + RNCO and CO + RC(NH)OH.
JOURNAL OF PHYSICAL CHEMISTRY A
(2023)
Article
Chemistry, Analytical
Bailey B. Bowers, Joel A. Thornton, Ryan C. Sullivan
Summary: This study investigates the use of iodide time-of-flight chemical ionization mass spectrometry (iodide-ToF-CIMS) for the online characterization of various PFAS compounds in the atmosphere. The researchers successfully measured different PFAS compounds in both gas and aerosol phases using various sample introduction methods. The study also sheds light on the behavior of PFAS compounds during chemical ionization, providing a more fundamental understanding of these compounds. The results demonstrate the potential of iodide-ToF-CIMS for online measurement of nonvolatile PFAS compounds in aerosols.
ENVIRONMENTAL SCIENCE-PROCESSES & IMPACTS
(2023)
Article
Immunology
Lidia Morawska, William Bahnfleth, Philomena M. Bluyssen, Atze Boerstra, Giorgio Buonanno, Stephanie J. Dancer, Andres Floto, Francesco Franchimon, Charles Haworth, Jaap Hogeling, Christina Isaxon, Jose L. Jimenez, Jarek Kurnitski, Yuguo Li, Marcel Loomans, Guy Marks, Linsey C. Marr, Livio Mazzarella, Arsen Krikor Melikov, Shelly Miller, Donald K. Milton, William Nazaroff, Peter Nielsen, Catherine Noakes, Jordan Peccia, Xavier Querol, Chandra Sekhar, Olli Seppanen, Shin-ichi Tanabe, Raymond Tellier, Tham Kwok Wai, Pawel Wargocki, Aneta Wierzbicka
Summary: This is an important account of a struggle in which a group of experts came together at the beginning of the COVID-19 pandemic to warn the world about the risk of airborne transmission and the consequences of ignoring it. Their concerns were dismissed by the World Health Organization, but later acknowledged when published in an international journal. The delay in acknowledging this issue had widespread consequences throughout the pandemic.
CLINICAL INFECTIOUS DISEASES
(2023)
Article
Engineering, Environmental
Emily B. Franklin, Lindsay D. Yee, Rebecca Wernis, Gabriel Isaacman-VanWertz, Nathan Kreisberg, Robert Weber, Haofei Zhang, Brett B. Palm, Weiwei Hu, Pedro Campuzano-Jost, Douglas A. Day, Antonio Manzi, Paulo Artaxo, Rodrigo A. F. De Souza, Jose L. Jimenez, Scot T. Martin, Allen H. Goldstein
Summary: Urbanization and fires have a significant impact on the quantities and composition of organic aerosol in the central Amazon, affecting radiative forcing and public health. The composition of ambient organic aerosol is complex and not fully understood, with limited knowledge about the different compounds present. Through analysis of aerosol samples, it was found that fires and urban emissions have distinct effects on the chemical signatures, and only a portion of compounds were observed in both seasons. This study highlights the need for further research to fill the knowledge gaps in understanding the speciation of organic aerosol in the Amazon.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Galib Hasan, Vili-Taneli Salo, Thomas Golin Almeida, Rashid R. Valiev, Theo Kurten
Summary: Organic peroxy radicals (RO2) play a crucial role in atmospheric chemistry, but their self-and cross-reactions, specifically RO2 + R ' O2 reactions, are still not well understood. This study investigates the competing H-shift channel and its effect on the formation of more volatile carbonyl and alcohol products. The results show that the H-shift barriers and rates are influenced by factors such as weakening of the breaking C-H bond, overall binding energy, and stability of the reaction products. The study also suggests that both the H-shift channel and the formation of ROOR 'via intersystem crossings are competitive for small and medium-sized RO2, but for complex R or R ' groups, the binding energy effect may make the H-shift channel less competitive.
JOURNAL OF PHYSICAL CHEMISTRY A
(2023)
Article
Chemistry, Multidisciplinary
Otso Perakyla, Torsten Berndt, Lauri Franzon, Galib Hasan, Melissa Meder, Rashid R. Valiev, Christopher David Daub, Jonathan G. Varelas, Franz M. Geiger, Regan J. Thomson, Matti Rissanen, Theo Kurten, Mikael Ehn
Summary: Gas-phase peroxy radical (RO2) cross reactions can be a major source of esters and other types of accretion products, which helps answer questions on the sources of accretion products in organic aerosol and bridge our knowledge of the gas phase formation and particle phase detection of accretion products. The stability of esters compared to peroxides also impacts their further reactivity in the aerosol.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Geosciences, Multidisciplinary
Suneeti Mishra, Sachchida Nand Tripathi, Vijay P. Kanawade, Sophie L. Haslett, Lubna Dada, Giancarlo Ciarelli, Varun Kumar, Atinderpal Singh, Deepika Bhattu, Neeraj Rastogi, Kaspar R. Daellenbach, Dilip Ganguly, Prashant Gargava, Jay G. Slowik, Markku Kulmala, Claudia Mohr, Imad El-Haddad, Andre S. H. Prevot
Summary: Measurements suggest that emissions from biomass burning are responsible for the rapid growth of particles leading to haze formation during the night in Delhi. Uncontrolled biomass burning affects air quality, climate, and human health globally, with Delhi experiencing severe haze events during winter. Despite unfavorable conditions for new-particle formation, particle growth events occur systematically. The condensation of primary organic vapours from biomass burning is the leading cause of particle growth, driven by a sharp decrease in night-time temperatures and rapid increase in biomass-burning emissions. This unique mechanism may affect 5% of the world's population and regional climate. Regulating uncontrolled biomass-combustion emissions can inhibit haze formation and improve human health in India.
Article
Multidisciplinary Sciences
Yee Jun Tham, Nina Sarnela, Siddharth Iyer, Qinyi Li, Helene Angot, Lauriane L. J. Quelever, Ivo Beck, Tiia Laurila, Lisa J. Beck, Matthew Boyer, Javier Carmona-Garcia, Ana Borrego-Sanchez, Daniel Roca-Sanjuan, Otso Perakyla, Roseline C. Thakur, Xu-Cheng He, Qiaozhi Zha, Dean Howard, Byron Blomquist, Stephen D. Archer, Ludovic Bariteau, Kevin Posman, Jacques Hueber, Detlev Helmig, Hans-Werner Jacobi, Heikki Junninen, Markku Kulmala, Anoop S. Mahajan, Andreas Massling, Henrik Skov, Mikko Sipila, Joseph S. Francisco, Julia Schmale, Tuija Jokinen, Alfonso Saiz-Lopez
Summary: Observations report the presence of HClO3 and HClO4 in the atmosphere, showing their widespread occurrence over the pan-Arctic during spring. These findings provide further insights into atmospheric chlorine cycling in the polar environment. The increase in HClO3 and HClO4 is linked to the increase in bromine levels, indicating the role of bromine chemistry in their formation and suggesting a previously missing atmospheric sink for reactive chlorine.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Qiaozhi Zha, Diego Aliaga, Radovan Krejci, Victoria A. Sinclair, Cheng Wu, Giancarlo Ciarelli, Wiebke Scholz, Liine Heikkinen, Eva Partoll, Yvette Gramlich, Wei Huang, Markus Leiminger, Joonas Enroth, Otso Peraekylae, Runlong Cai, Xuemeng Chen, Alkuin Maximilian Koenig, Fernando Velarde, Isabel Moreno, Tuukka Petaja, Paulo Artaxo, Paolo Laj, Armin Hansel, Samara Carbone, Markku Kulmala, Marcos Andrade, Douglas Worsnop, Claudia Mohr, Federico Bianchi
Summary: In this study, the presence of oxidized organic molecules, mainly with 4-5 carbon atoms, in the gas-phase and particle-phase of tropical free troposphere air from Amazonia was demonstrated for the first time. These molecules are linked to isoprene emitted from rainforests hundreds of kilometers away and can contribute to the formation of new particles.
NATIONAL SCIENCE REVIEW
(2023)
Article
Chemistry, Multidisciplinary
Jie Zhang, Manish Shrivastava, Alla Zelenyuk, Rahul A. Zaveri, Jason D. Surratt, Matthieu Riva, David Bell, Marianne Glasius
Summary: This study investigates the key parameters governing the formation of isoprene epoxydiol-derived secondary organic aerosol (IEPOX-SOA). The results show that reducing the reaction rate constants of 2-methyltetrol (tetrol) can bring the model predictions in agreement with experimental measurements of IEPOX-SOA under acidified aerosol conditions. Additionally, both the organosulfate (OS) and tetrol reaction rate constants need to be reduced for nonacidified aerosols to match the chamber observations. The study also reveals that the aerosol acidity significantly affects the oligomerization rate of tetrols.
ACS EARTH AND SPACE CHEMISTRY
(2023)
Article
Engineering, Environmental
Duseong S. Jo, Benjamin A. Nault, Simone Tilmes, Andrew Gettelman, Christina S. Mccluskey, Alma Hodzic, Daven K. Henze, Muhammad Omar Nawaz, Ka Ming Fung, Jose L. Jimenez
Summary: This study quantifies the health and climate effects of organic aerosols (OA) from anthropogenic, biomass burning, and biogenic sources. The findings show that anthropogenic primary OA (POA) has the highest efficiency for health effects but the lowest for direct radiative effects. Biogenic OA exhibits moderate efficiency for health effects and the highest for direct radiative effects, while biomass burning OA plays a significant role in cloud radiative effect changes in remote atmospheres.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Meteorology & Atmospheric Sciences
Jing Cai, Kaspar R. Daellenbach, Cheng Wu, Yan Zheng, Feixue Zheng, Wei Du, Sophie L. Haslett, Qi Chen, Markku Kulmala, Claudia Mohr
Summary: The offline application of FIGAERO-CIMS provides a cost-efficient method to analyze the molecular composition of organic aerosols. This study demonstrates the feasibility of using Teflon and quartz fiber filter samples collected in urban Beijing, with high signal-to-noise ratios, repeatability, and linear signal response. It expands the molecular characterization of organic aerosols by FIGAERO-CIMS to situations where the instrument itself cannot be deployed.
ATMOSPHERIC MEASUREMENT TECHNIQUES
(2023)
Article
Environmental Sciences
Wiebke Scholz, Jiali Shen, Diego Aliaga, Cheng Wu, Samara Carbone, Isabel Moreno, Qiaozhi Zha, Wei Huang, Liine Heikkinen, Jean Luc Jaffrezo, Gaelle Uzu, Eva Partoll, Markus Leiminger, Fernando Velarde, Paolo Laj, Patrick Ginot, Paolo Artaxo, Alfred Wiedensohler, Markku Kulmala, Claudia Mohr, Marcos Andrade, Victoria Sinclair, Federico Bianchi, Armin Hansel
Summary: Quantitative measurements using mass spectrometry were conducted to study the fate of DMS and its oxidation products in the remote free troposphere. The results showed that most of the DMS was converted to unreactive DMSO2 and particle-phase MS-, with the particulate sulfate being dominated by regional volcanic emissions rather than marine air masses. This study demonstrates the potential impact of marine DMS emissions on the availability of sulfur-containing vapors in the remote free troposphere far away from the ocean.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2023)
Article
Environmental Sciences
Ben H. Lee, Siddharth Iyer, Theo Kurten, Jonathan G. Varelas, Jingyi Luo, Regan J. Thomson, Joel A. Thornton
Summary: The atmospheric oxidation of monoterpene compounds (C10H16) contributes to the concentration of ambient particles and mass, mainly due to the auto-oxidation of resulting peroxy radicals to low-volatility highly oxygenated molecules (HOMs). The isomer of the first-generation hydroxy peroxy radical, formed by opening the cyclobutyl ring, is believed to be responsible for the majority of HOMs derived from OH-initiated oxidation of alpha and beta-pinene. By combining isotopically labeled precursors and direct measurements, the yield and auto-oxidation rate of this isomer were constrained, showing their significant atmospheric importance for a wide range of conditions.
ENVIRONMENTAL SCIENCE-ATMOSPHERES
(2023)
Article
Chemistry, Physical
Prasenjit Seal, Shawon Barua, Siddharth Iyer, Avinash Kumar, Matti Rissanen
Summary: A systematic study was conducted on H-shifts in pristine acyl peroxy radicals for the first time, revealing their importance as a path to functionalization in both rural and urban air quality modeling, and their competitiveness even under moderately polluted atmospheric conditions.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
