Article
Engineering, Environmental
Laura Hyesung Yang, David H. Hagan, Jean C. Rivera-Rios, Makoto M. Kelp, Eben S. Cross, Yuyang Peng, Jennifer Kaiser, Leah R. Williams, Philip L. Croteau, John T. Jayne, Nga Lee Ng
Summary: Advances in low-cost sensors (LCS) have provided opportunities to characterize air quality in finer spatial and temporal resolutions. In this study, LCS were deployed in Atlanta, GA, alongside research-grade instruments to investigate air pollution sources using non-negative matrix factorization (NMF). Results show that both normalized and non-normalized LCS datasets can resolve primary organic aerosol (POA) factors, while normalization can provide factors with more diverse compositions and resolve secondary organic aerosol (SOA) as well.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Multidisciplinary Sciences
Rahul A. Zaveri, Jian Wang, Jiwen Fan, Yuwei Zhang, John E. Shilling, Alla Zelenyuk, Fan Mei, Rob Newsom, Mikhail Pekour, Jason Tomlinson, Jennifer M. Comstock, Manish Shrivastava, Edward Fortner, Luiz A. T. Machado, Paulo Artaxo, Scot T. Martin
Summary: This study presents aircraft observations of rapid growth of anthropogenic nanoparticles downwind of an isolated metropolis in the Amazon rainforest. Model analysis suggests that the sustained particle growth to cloud condensation nuclei sizes is mainly caused by particle-phase diffusion-limited partitioning of semivolatile oxidation products of biogenic hydrocarbons. Cloud-resolving numerical simulations show that the increased cloud condensation nuclei concentrations in the urban plume significantly alter cloud formation and precipitation, suggesting an appreciable impact of anthropogenic aerosols on cloud life cycle in previously unpolluted forests of the world.
Article
Chemistry, Multidisciplinary
Manish Shrivastava, Quazi Z. Rasool, Bin Zhao, Mega Octaviani, Rahul A. Zaveri, Alla Zelenyuk, Brian Gaudet, Ying Liu, John E. Shilling, Johannes Schneider, Christiane Schulz, Martin Zoeger, Scot T. Martin, Jianhuai Ye, Alex Guenther, Rodrigo F. Souza, Manfred Wendisch, Ulrich Poeschl
Summary: Combining aircraft measurements and model simulations, this study reveals the important role of in-plant biochemistry in fine particulate formation and atmosphere-biosphere- climate interactions over the Amazon rainforest. The study shows that direct emissions of certain gases formed by in-plant biochemical reactions explain a significant portion of sub-micrometer aerosol particles in the upper troposphere.
ACS EARTH AND SPACE CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Chuanen Guo, Luyao Xu, Chenxi Zhang
Summary: This study investigates the heterogeneous OH oxidation mechanism of 3-methyltetraol sulfate (3-MTS), a common organic sulfate in atmospheric particles. The results show that 3-MTS easily undergoes abstraction reaction with OH radicals, generating low-volatility species that are important components of secondary organic aerosol. The study provides insights into the reactivity of other organosulfates in atmospheric aerosols and the conversion of sulfur between its organic and inorganic forms during oxidation.
Article
Chemistry, Physical
Carmen M. Tovar, Alexander Haack, Ian Barnes, Iustinian Gabriel Bejan, Peter Wiesen
Summary: The reactivity of epoxides with chlorine atoms was evaluated using experimental determinations, theoretical calculations, and SAR estimations in this study. It was found that adding a CH2 group increases the reactivity towards chlorine atoms. Theoretical calculations were in good agreement with experimental findings, and the importance of considering geometrical distribution and ring influence for improving SAR calculations was discussed.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Chemistry, Physical
Alison M. Fankhauser, Ziying Lei, Kimberly R. Daley, Yao Xiao, Zhenfa Zhang, Avram Gold, Bruce S. Ault, Jason D. Surratt, Andrew P. Ault
Summary: Organosulfates formed from organic-derived oxidation products with sulfate ions contribute to a significant portion of secondary organic aerosol mass. However, the molecular structures of these organosulfates under atmospherically relevant conditions are not well understood. In this study, the protonation state and vibrational modes of 2-methyltetrol sulfates were investigated. It was found that these organosulfates are primarily deprotonated at atmospheric pH values.
JOURNAL OF PHYSICAL CHEMISTRY A
(2022)
Article
Nuclear Science & Technology
Tanmoy Das, R. V. Kolekar, R. K. Gopalakrishnan
Summary: This paper presents an algorithm designed for a continuous air monitor based on gross alpha counts, which can generate the variation of gross alpha count rate with time using in situ-measured radon progeny data. The required atom concentration input can be obtained through a simple experimental technique discussed in this paper.
NUCLEAR TECHNOLOGY
(2021)
Review
Chemistry, Multidisciplinary
Sze In Madeleine Ng, Man Nin Chan
Summary: This article reviews the recent advances in understanding the heterogeneous oxidation of organosulfates (OSs) in the atmosphere and discusses the influence of different structures on the reaction pathways. The authors propose future research directions to improve our mechanistic understanding of these reactions.
CHEMICAL COMMUNICATIONS
(2023)
Article
Environmental Sciences
Gregoire Dougniaux, Gwenael Hoarau
Summary: In nuclear facilities, false alarms in airborne contamination surveillance, mainly for artificial alpha, are often caused by sudden variations in the aerosol mass sizes distribution. Experiments comparing measured and estimated values based on aerosol characteristics have shown significant improvements, highlighting the importance of considering aerosol characteristics for accurate airborne contamination measurement.
RADIATION PROTECTION DOSIMETRY
(2023)
Review
Environmental Sciences
Kevin A. Wokosin, Emma L. Schell, Jennifer A. Faust
Summary: This review summarizes recent advances in measuring, modeling, and observing surfactants in atmospheric aerosol particles. The future focus should be on the development of single-particle techniques and laboratory studies of complex aerosol systems to bridge the gap between field observations and fundamental investigations.
ENVIRONMENTAL SCIENCE-ATMOSPHERES
(2022)
Article
Engineering, Environmental
Mihnea Surdu, Houssni Lamkaddam, Dongyu S. Wang, David M. Bell, Mao Xiao, Chuan Ping Lee, Dandan Li, Lucia Caudillo, Guillaume Marie, Wiebke Scholz, Mingyi Wang, Brandon Lopez, Ana A. . Piedehierro, Farnoush Ataei, Rima Baalbaki, Barbara Bertozzi, Pia Bogert, Zoe Brasseur, Lubna Dada, Jonathan Duplissy, Henning Finkenzeller, Xu-Cheng He, Kristina Hohler, Kimmo Korhonen, Jordan E. Krechmer, Katrianne Lehtipalo, Naser G. A. . Mahfouz, Hanna E. Manninen, Ruby Marten, Dario Massabo, Roy Mauldin, Tuukka Petaja, Joschka Pfeifer, Maxim Philippov, Birte Rorup, Mario Simon, Jiali Shen, Nsikanabasi Silas Umo, Franziska Vogel, Stefan K. . Weber, Marcel Zauner-Wieczorek, Rainer Volkamer, Harald Saathoff, Ottmar Moehler, Jasper Kirkby, Douglas R. Worsnop, Markku Kulmala, Frank Stratmann, Armin Hansel, Joachim Curtius, Andre Welti, Matthieu Riva, Neil M. Donahue, Urs Baltensperger, Imad El Haddad
Summary: This study investigates the effect of high relative humidity (RH) on the gas-particle partitioning of biogenic oxidized organic molecules at low temperatures. The results demonstrate that high RH increases the partitioning of semivolatile compounds and leads to a shift in the chemical composition and volatility distribution of organic aerosols towards less oxygenated and more volatile species.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Henning Finkenzeller, Siddharth Iyer, Xu-Cheng He, Mario Simon, Theodore K. Koenig, Christopher F. Lee, Rashid Valiev, Victoria Hofbauer, Antonio Amorim, Rima Baalbaki, Andrea Baccarini, Lisa Beck, David M. Bell, Lucia Caudillo, Dexian Chen, Randall Chiu, Biwu Chu, Lubna Dada, Jonathan Duplissy, Martin Heinritzi, Deniz Kemppainen, Changhyuk Kim, Jordan Krechmer, Andreas Kurten, Alexandr Kvashnin, Houssni Lamkaddam, Chuan Ping Lee, Katrianne Lehtipalo, Zijun Li, Vladimir Makhmutov, Hanna E. Manninen, Guillaume Marie, Ruby Marten, Roy L. Mauldin, Bernhard Mentler, Tatjana Muller, Tuukka Petaja, Maxim Philippov, Ananth Ranjithkumar, Birte Rorup, Jiali Shen, Dominik Stolzenburg, Christian Tauber, Yee Jun Tham, Antonio Tome, Miguel Vazquez-Pufleau, Andrea C. Wagner, Dongyu S. Wang, Mingyi Wang, Yonghong Wang, Stefan K. Weber, Wei Nie, Yusheng Wu, Mao Xiao, Qing Ye, Marcel Zauner-Wieczorek, Armin Hansel, Urs Baltensperger, Jerome Brioude, Joachim Curtius, Neil M. Donahue, Imad El Haddad, Richard C. Flagan, Markku Kulmala, Jasper Kirkby, Mikko Sipila, Douglas R. Worsnop, Theo Kurten, Matti Rissanen, Rainer Volkamer
Summary: Iodine is an active trace element in atmospheric chemistry that can destroy ozone and form particles. Its emissions have increased threefold since 1950 and are expected to continue rising. In laboratory experiments, iodooxy hypoiodite (IOIO) was shown to efficiently convert into iodic acid (HIO3) via reactions IOIO + O-3 -> IOIO4 and IOIO4 + H2O -> HIO3 + HOI + O-(1)(2). This laboratory-derived mechanism explains field observations of daytime HIO3 in the remote lower free troposphere and suggests a catalytic role of iodine in aerosol formation.
Article
Engineering, Environmental
Penggang Zheng, Yi Chen, Zhe Wang, Yuliang Liu, Wei Pu, Chuan Yu, Men Xia, Yang Xu, Jia Guo, Yishuo Guo, Linhui Tian, Xiaohui Qiao, Dan Dan Huang, Chao Yan, Wei Nie, Douglas R. Worsnop, Shuncheng Lee, Tao Wang
Summary: This study conducted ambient measurements of OOMs at a regional background site in South China. It revealed that nitrogen-containing products were dominant, and different factors influenced the composition and oxidation state of OOMs. The results demonstrated the significant role of OOMs in sub-100 nm particle growth and SOA formation.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Bo Chen, Jessica A. Mirrielees, Yuzhi Chen, Timothy B. Onasch, Zhenfa Zhang, Avram Gold, Jason D. Surratt, Yue Zhang, Sarah D. Brooks
Summary: We measured the Tg of IEPOX-derived SOA components using broadband dielectric spectroscopy and found that the Tg of mixtures depends on their composition. The Kwei equation provides a good fit for the Tg-composition relationship of complex mixtures. We demonstrate that the non-linear deviation of Tg as a function of composition may be caused by changes in the extent of hydrogen bonding in the mixture using Raman spectroscopy and density functional theory.
JOURNAL OF PHYSICAL CHEMISTRY A
(2023)
Review
Environmental Sciences
Arturo A. Keller, Kendra Garner, Nalini Rao, Eladio Knipping, Jeffrey Thomas
Summary: Global changes, such as climate and land use changes, have significant impacts on water resources. In order to plan for these changes, it is necessary to make projections and evaluate different hydrologic and water quality models. Among the models evaluated, MIKE-SHE, HEC-HMS, MODHMS, SWAT, and WARMF stand out in terms of functionality, availability, applicability, and support.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Correction
Chemistry, Multidisciplinary
David O. De Haan, Lelia N. Hawkins, Praveen D. Wickremasinghe, Alyssa D. Andretta, Juliette R. Dignum, Audrey C. De Haan, Hannah G. Welsh, Elyse A. Pennington, Tianqu Cui, Jason D. Surratt, Mathieu Cazaunau, Edouard Pangui, Jean-Francois Doussin
ACS EARTH AND SPACE CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
David O. De Haan, Lelia N. Hawkins, Praveen D. Wickremasinghe, Alyssa D. Andretta, Juliette R. Dignum, Audrey C. De Haan, Hannah G. Welsh, Elyse A. Pennington, Tianqu Cui, Jason D. Surratt, Mathieu Cazaunau, Edouard Pangui, Jean-Francois Doussin
Summary: Aqueous-phase dark reactions during the co oxidation of glyoxal and S(IV) were found to be a potential source of brown carbon (BrC), which occurs more slowly in sunlit, sulfite containing solutions. Detectable amounts of BrC in aerosol require an OH radical source and occur most rapidly after a cloud event. Radical-initiated reactions and redox mechanisms play a role in this process. However, the BrC produced is about ten times less light-absorbing than wood smoke BrC at 365 nm.
ACS EARTH AND SPACE CHEMISTRY
(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
Clara M. A. Eichler, Naomi Y. Chang, Elaine A. Cohen Hubal, Daniel E. Amparo, Jiaqi Zhou, Jason D. Surratt, Glenn C. Morrison, Barbara J. Turpin
Summary: During the Indoor PFAS Assessment (IPA) Campaign, concentrations of nine neutral PFAS were measured in air and cotton cloth in 11 homes in North Carolina. The study found that fluorotelomer alcohols were the dominant species in indoor air, while perfluorooctane sulfonamidoethanols accumulated most significantly in cloth. Cloth-air partition coefficients were derived for different PFAS and were positively correlated with the octanol-air partition coefficient. Temperature was found to have the greatest effect on PFAS accumulation.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Environmental Sciences
Lucia Caudillo, Mihnea Surdu, Brandon Lopez, Mingyi Wang, Markus Thoma, Steffen Brakling, Angela Buchholz, Mario Simon, Andrea C. Wagner, Tatjana Mueller, Manuel Granzin, Martin Heinritzi, Antonio Amorim, David M. Bell, Zoe Brasseur, Lubna Dada, Jonathan Duplissy, Henning Finkenzeller, Xu-Cheng He, Houssni Lamkaddam, Naser G. A. Mahfouz, Vladimir Makhmutov, Hanna E. Manninen, Guillaume Marie, Ruby Marten, Roy L. Mauldin, Bernhard Mentler, Antti Onnela, Tuukka Petaja, Joschka Pfeifer, Maxim Philippov, Ana A. Piedehierro, Birte Rorup, Wiebke Scholz, Jiali Shen, Dominik Stolzenburg, Christian Tauber, Ping Tian, Antonio Tome, Nsikanabasi Silas Umo, Dongyu S. Wang, Yonghong Wang, Stefan K. Weber, Andre Welti, Marcel Zauner-Wieczorek, Urs Baltensperger, Richard C. Flagan, Armin Hansel, Jasper Kirkby, Markku Kulmala, Katrianne Lehtipalo, Douglas R. Worsnop, Imad El Haddad, Neil M. Donahue, Alexander L. Vogel, Andreas Kuerten, Joachim Curtius
Summary: The complete chemical characterization of nanoparticles is challenging due to their abundance but negligible mass. This study compares different techniques for the chemical composition analysis of secondary organic aerosol nanoparticles. The experiments were conducted at the CLOUD chamber, and simultaneous measurements were performed using four different techniques. The results generally agree on the important compounds found in the nanoparticles, but each technique captures different parts of the organic spectrum, potentially due to factors such as thermal decomposition or sampling artifacts.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2023)
Article
Environmental Sciences
Daniel John Katz, Aroob Abdelhamid, Harald Stark, Manjula R. Canagaratna, Douglas R. Worsnop, Eleanor C. Browne
Summary: Measurements of ambient ion chemical composition provide direct insight into the most acidic and basic trace gases and their ion-molecule clusters. The use of the atmospheric pressure interface time-of-flight mass spectrometer (APi-ToF) combined with binPMF analysis allows for the temporal evolution of compounds important for new particle formation and growth to be studied. The results showed that negative ions consist of strong acids, organosulfates, and clusters derived from monoterpene and sesquiterpene oxidation, while positive ions consist of alkyl pyridines and amines.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2023)
Article
Chemistry, Analytical
Marc Webb, Liyong Cui, Glenn Morrison, Karsten Baumann, Jason D. Surratt, Zhenfa Zhang, Joanna Atkin, Barbara J. Turpin
Summary: Humidity affects the removal and concentrations of indoor pollutants, especially in humid homes. Research on a model organic peroxide showed that the relative humidity has a greater effect on the removal rate and reaction probability on soiled surfaces compared to clean surfaces. These findings are important for predicting indoor concentrations of organic peroxides.
ENVIRONMENTAL SCIENCE-PROCESSES & IMPACTS
(2023)
Article
Environmental Sciences
Jian Zhao, Ella Hakkinen, Frans Graeffe, Jordan E. Krechmer, Manjula R. Canagaratna, Douglas R. Worsnop, Juha Kangasluoma, Mikael Ehn
Summary: Highly oxygenated organic molecules (HOMs) are crucial for the formation of secondary organic aerosol (SOA), but the lack of suitable analytical techniques has limited our understanding of particle-phase HOM speciation and its relationship with gas-phase HOM formation. This study used a novel VIA-NO3-CIMS system to investigate the gas- and particle-phase HOM products of a-pinene ozonolysis. The results showed that gas-phase dimer formation was suppressed with the addition of CO or NO, but particle-phase dimers still constituted a considerable fraction of the observed SOA. Overall, the VIA-NO3-CIMS system showed promise for combined online gas- and particle-phase HOM measurements.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2023)
Article
Environmental Sciences
Daniel J. Bryant, Beth S. Nelson, Stefan J. Swift, Sri Hapsari Budisulistiorini, Will S. Drysdale, Adam R. Vaughan, Mike J. Newland, James R. Hopkins, James M. Cash, Ben Langford, Eiko Nemitz, W. Joe F. Acton, C. Nicholas Hewitt, Tuhin Mandal, Bhola R. Gurjar, Shivani, Ranu Gadi, James D. Lee, Andrew R. Rickard, Jacqueline F. Hamilton
Summary: Delhi, India is one of the most polluted cities in the world, but little is known about the emissions of biogenic volatile organic compounds (VOCs) or the sources of secondary organic aerosol (SOA). This study provides the first molecular-level measurements of SOA derived from isoprene and monoterpene in Delhi, and demonstrates that both biogenic and anthropogenic sources of these compounds can be important in urban areas.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2023)
Article
Environmental Sciences
Daniel J. J. Bryant, Alfred W. W. Mayhew, Kelly L. L. Pereira, Sri Hapsari Budisulistiorini, Connor Prior, William Unsworth, David O. O. Topping, Andrew R. R. Rickard, Jacqueline F. F. Hamilton
Summary: This study proposes a quantification method based on the prediction of relative ionisation efficiency factors to correct the concentrations of biogenic secondary organic aerosol species. The method was developed using commercially available standards and was able to predict the ionisation efficiency factors of biogenic organic acids without authentic standards. The concentration of biogenic secondary organic aerosol was corrected using the predicted factors and resulted in a significant decrease in average concentration.
ENVIRONMENTAL SCIENCE-ATMOSPHERES
(2023)