Article
Environmental Sciences
Pornpan Uttamang, Parkpoom Choomanee, Jitlada Phupijit, Surat Bualert, Thunyapat Thongyen
Summary: In Bangkok, concentrations of fine particulate matter (PM2.5) often exceed standards, leading to moderate to unhealthy air quality conditions. A study conducted in January 2021 investigated secondary organic aerosol (SOA) formation using the EC tracer method. The results showed a negative correlation between PM2.5 and O-3, indicating fossil fuel combustion as the major source of carbonaceous aerosols in Bangkok. SOC contributed significantly to OC, with the highest contribution during low pollution events, suggesting the importance of reducing NOx and O-3 for a more sustainable urban environment.
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
Environmental Sciences
Barend L. van Drooge, Roger Garatachea, Cristina Reche, Gloria Titos, Andres Alastuey, Hassan Lyamani, Lucas Alados-Arboledas, Xavier Querol, Joan O. Grimalt
Summary: The concentrations and composition of PM10 and organic aerosols in Barcelona and Granada differ significantly, with biomass burning and traffic emissions being the major contributors in both cities. Barcelona has better air quality, with higher contributions from fresh secondary organic aerosols, while in Granada, air pollution and stagnant meteorological conditions result in dominant aged secondary organic aerosols.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Environmental Sciences
Brian T. Dinkelacker, Spyros N. Pandis
Summary: Developing a parameterization for biogenic SOA formation as a result of aging using recent laboratory results, the study applied this parameterization in PMCAMx over the eastern United States to simulate summertime conditions. The predictions showed modest increases in predicted domain average biogenic SOA, with alternative parameterization resulting in small increases. Model performance evaluation against measurements showed modest and mixed differences, consistent with the relatively small effect of the proposed parameterization on total organic aerosol levels.
ATMOSPHERIC ENVIRONMENT
(2021)
Article
Environmental Sciences
Gyutae Park, Seokwon Kang, Min-Suk Bae, Yunsung Lim, Chan-Soo Jeon, Taehyoung Lee
Summary: The aim of this study was to determine the seasonal trends in secondary aerosols and urban pollutants in Seoul. The results showed high concentrations of primary pollutants and significant contributions of potential organic aerosol enhancement (OA(PE)) to the formation of secondary organic aerosols (SOA). Furthermore, intermediate volatile organic compounds (IVOCs) were found to have higher contributions to SOA formation compared to anthropogenic and biogenic VOCs, suggesting the need for further research in this area.
ATMOSPHERIC ENVIRONMENT
(2023)
Article
Environmental Sciences
Gyutae Park, Kyunghoon Kim, Taehyun Park, Seokwon Kang, Jihee Ban, Siyoung Choi, Dong-Gil Yu, Sanguk Lee, Yunsung Lim, Sunmoon Kim, Sunhee Mun, Jung-Hun Woo, Chan-Soo Jeon, Taehyoung Lee
Summary: This study identified the emissions characteristics of primary gas/aerosol and secondary aerosol for small passenger vehicles in South Korea using different fuel types. It was found that NH3 levels were higher in gasoline and LPG vehicle emissions compared to diesel vehicles, while carbonaceous aerosols in EURO 4-6 diesel vehicles were reduced by up to 95% compared to EURO 2-3 vehicles. The study also observed an increase in the expected SOA yield through the hot-condition combustion section of vehicles.
ENVIRONMENTAL POLLUTION
(2021)
Article
Environmental Sciences
Eleftherios Ioannidis, Kathy S. Law, Jean-Christophe Raut, Louis Marelle, Tatsuo Onishi, Rachel M. Kirpes, Lucia M. Upchurch, Thomas Tuch, Alfred Wiedensohler, Andreas Massling, Henrik Skov, Patricia K. Quinn, Kerri A. Pratt
Summary: Anthropogenic and natural emissions contribute to the increase in aerosol concentrations in the Arctic during winter and early spring, with a focus on anthropogenic aerosols known as Arctic haze. This study investigates the less-studied wintertime sea-spray aerosols (SSAs) under Arctic haze conditions, which can significantly contribute to Arctic aerosol abundances. Field campaign data analysis reveals evidence of enhanced local sources of SSAs, including marine organics, in northern Alaska during winter 2014. However, current models underestimate sub-micron SSAs and overestimate super-micron SSAs in the Arctic during winter, and the Weather Research Forecast coupled with Chemistry (WRF-Chem) model used here has limited accuracy. The inclusion of updated wind speed and sea-surface temperature (SST) SSA emission dependencies leads to improved model performance, highlighting the importance of interactions between natural SSAs and inorganic anthropogenic aerosols in Arctic haze.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2023)
Article
Engineering, Chemical
F. Jacob, N. Houzel, P. Genevray, C. Clety, C. Coeur, E. Perdrix, L. Y. Alleman, S. Antherieu, G. Garcon, G. Dhont, A. Cuisset, J. -m. Lo Guidice, A. Tomas
Summary: This study combines experimental and theoretical approaches to investigate the formation mechanism of secondary organic aerosol (SOA) during the ozonolysis of limonene. The results reveal the formation of oligomers up to heptamer structures through non-covalent hydrogen bonding involving carboxylic/carbonyl/hydroxy groups. The findings highlight the need for further investigation on the atmospheric fate and health impacts of large oligomeric molecules.
JOURNAL OF AEROSOL SCIENCE
(2023)
Article
Environmental Sciences
Vigneshkumar Balamurugan, Jia Chen, Zhen Qu, Xiao Bi, Frank N. Keutsch
Summary: This study estimates the influence of anthropogenic emission reductions on the concentration of PM2.5 during the 2020 lockdown period in German metropolitan areas. The results show that PM2.5 concentrations were lower during the lockdown compared to the same time period in 2019, with larger reductions in winter than in spring. The study also suggests that appropriate control measures for NOx, VOCs, and NH3 emissions are needed to limit ozone and reduce PM2.5 pollution.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2022)
Article
Environmental Sciences
Yuanping He, Lei Li, Haolin Wang, Xinqi Xu, Yuman Li, Shaojia Fan
Summary: This study reconstructed the spatiotemporal variabilities and characteristics of ozone (O-3) and fine particulate matter (PM2.5) in Zhuhai, China, and analyzed the interaction between meteorological conditions and the co-occurrence of O3 and PM2.5. The results showed that the relatively weak synoptic winds, low mixing height, and pollution sources in the Pearl River Delta contributed to the high concentrations of O-3 and PM2.5 in Zhuhai.
ENVIRONMENTAL POLLUTION
(2022)
Article
Environmental Sciences
Marianne Glasius, Ditte Thomsen, Kai Wang, Louise Skov Iversen, Jing Duan, Ru-Jin Huang
Summary: This study investigated the speciation and levels of organosulfates, organosulfonates, and carboxylic acids in aerosol samples collected in Xi'an, Northwest China, during the summer and winter seasons. The results provide insights into the composition and sources of organic aerosols in this heavily polluted region.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Fumikazu Ikemori, Rie Nishimura, Shinji Saito, Masayuki Akiyama, Shigekazu Yamamoto, Akihiro Iijima, Seiji Sugata
Summary: The study reveals that the impact of secondary organic aerosols on water-soluble organic carbon is significant in urban areas in Japan during both spring and summer, with different sources of SOAs affecting WSOC to varying degrees.
Article
Environmental Sciences
G. M. Lanzafame, D. Srivastava, O. Favez, B. A. M. Bandowe, P. Shahpoury, G. Lammel, N. Bonnaire, L. Y. Alleman, F. Couvidat, B. Bessagnet, A. Albinet
Summary: A study in the Paris region monitored twenty-five biogenic and anthropogenic secondary organic aerosol markers over one year, with seasonal and chemical patterns similar to Europe but different from America and Asia. Nitroaromatic compounds had higher concentrations in winter, while isoprene SOA marker concentrations increased in summer and pinene SOA markers showed no clear trend.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Energy & Fuels
Jose Antonio Velez Godino, Miguel Torres Garcia, Francisco Jose Jimenez-Espadafor Aguilar
Summary: This study assesses the thermal performance and emissions of diesel/biodiesel blends under low-temperature combustion (LTC) through experimental analysis. A predictive model is developed based on the experimental data to accurately predict the LTC of diesel/biodiesel blends.
Article
Environmental Sciences
Zhancong Liang, Liyuan Zhou, Xinyue Li, Rosemarie Ann Infante Cuevas, Rongzhi Tang, Mei Li, Chunlei Cheng, Yangxi Chu, Patrick K. H. Lee, Alvin C. K. Lai, Chak K. Chan
Summary: Incense burning is a religious activity that emits pollutants into the atmosphere. We found that nitrogen-containing organic compounds in incense burning particles can react with ozone to form nitrate, and this reaction is significantly enhanced in the presence of UV light. Our study provides insights into the air pollution caused by religious activities.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Le Yuan, Olalekan A. M. Popoola, Christina Hood, David Carruthers, Roderic L. Jones, Huan Liu, Zhaofeng Lv, Qiang Zhang, Alexander T. Archibald
Summary: This study introduces a new methodology for updating emissions inventories by source sector using air quality ensemble simulations and observations. Through comparing simulation outputs with observational constraints, the study shows reductions in transport sector emissions and residential sector emissions within the study area. The study demonstrates the applicability of perturbed emissions ensemble and high-resolution observations in providing timely updates of emission estimates by source sector.
AIR QUALITY ATMOSPHERE AND HEALTH
(2021)
Article
Meteorology & Atmospheric Sciences
S. Archer-Nicholls, N. L. Abraham, Y. M. Shin, J. Weber, M. R. Russo, D. Lowe, S. R. Utembe, F. M. O'Connor, B. Kerridge, B. Latter, R. Siddans, M. Jenkin, O. Wild, A. T. Archibald
Summary: The new CRI-Strat mechanism is more complex than the existing StratTrop mechanism but only 75% more computationally expensive. It affects ozone production and loss differently compared to StratTrop and also impacts the generation of carbon monoxide and nitrogen oxides.
JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS
(2021)
Article
Meteorology & Atmospheric Sciences
G. A. Folberth, Z. Staniaszek, A. T. Archibald, N. Gedney, P. T. Griffiths, C. D. Jones, F. M. O'Connor, R. J. Parker, A. A. Sellar, A. Wiltshire
Summary: Methane is an important greenhouse gas and atmospheric pollutant. Understanding its global cycle and interactions with the Earth system is crucial for accurate predictions of climate change and assessments of mitigation strategies. A newly developed methane emission-driven model successfully simulates the methane cycle and provides important insights into methane sources and sinks. The model's results are in good agreement with available observations.
JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS
(2022)
Article
Environmental Sciences
Steven T. Turnock, Robert Allen, Alex T. Archibald, Mohit Dalvi, Gerd Folberth, Paul T. Griffiths, James Keeble, Eddy Robertson, Fiona M. O'Connor
Summary: This study assesses the combined impacts of future mitigation measures on air quality and climate, revealing that strong mitigation measures applied to all near-term climate forcers (NTCFs) are necessary to achieve co-benefits. Only mitigating aerosol components benefits air quality but has detrimental impacts on climate, and there are important non-linearities and interactions between NTCFs.
Article
Multidisciplinary Sciences
Emily Matthews, Thomas J. Bannan, M. Anwar H. Khan, Dudley E. Shallcross, Harald Stark, Eleanor C. Browne, Alexander T. Archibald, Archit Mehra, Stephane J. -B. Bauguittei, Chris Reed, Navaneeth M. Thamban, Huihui Wu, Patrick Barker, James Lee, Lucy J. Carpenter, Mingxi Yang, Thomas G. Bell, Grant Allen, John T. Jayne, Carl J. Percival, Gordon McFiggansa, Martin Gallaghera, Hugh Coe
Summary: This study reveals the presence and importance of urea in the atmosphere, originating primarily from the ocean. It also highlights the potential long-range transport of urea from biomass-burning plumes. The presence of urea has significant implications for marine ecosystems, carbon dioxide uptake, and climate.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Geosciences, Multidisciplinary
F. Robertson, L. E. Revell, H. Douglas, A. T. Archibald, O. Morgenstern, D. Frame
Summary: The year when total column ozone (TCO) returns to 1980 levels is commonly used to measure recovery from ozone-depleting substances. However, this metric fails to account for internal variability and the timing of significant TCO losses. Using the signal-to-noise (S/N) metric, this study investigates how TCO can return to pre-disturbance conditions. The findings suggest that TCO de-emerges before returning to its 1980 value, making S/N a suitable metric for determining TCO recovery.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Environmental Sciences
Maria Rosa Russo, Brian John Kerridge, Nathan Luke Abraham, James Keeble, Barry Graham Latter, Richard Siddans, James Weber, Paul Thomas Griffiths, John Adrian Pyle, Alexander Thomas Archibald
Summary: This study investigates the recent changes and driving factors of tropospheric ozone in the North Atlantic region using observed ozone data from OMI and MLS and comparing it with the UM-UKCA simulations. The model shows positive bias in the tropical upper troposphere and negative bias at mid-latitudes relative to the observations. The seasonal cycle of ozone in the North Atlantic is well represented in the model, but the modelled ozone trends have large uncertainties and differ from the observed trends.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2023)
Article
Environmental Sciences
Scott Archer-Nicholls, Rachel Allen, Nathan L. Abraham, Paul T. Griffiths, Alex T. Archibald
Summary: This study presents projections of NO3 radical evolution from 1850 to 2100 using the United Kingdom Earth System Model (UKESM1) under the Coupled Model Intercomparison Project Phase 6 (CMIP6) shared socioeconomic pathway (SSP) scenarios. The results show diverse trajectories for NO3, with some scenarios and regions experiencing rapid growth of NO3 to unprecedented levels in the 21st century, while others see sharp declines. The local increases in NO3 are driven by both local changes in nitrogen oxide emissions and a climate component, with NO3 favored in warmer future climates, impacting regional and global particulate matter pollution.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2023)
Article
Environmental Sciences
Fouzia Fahrin, Daniel C. Jones, Yan Wu, James Keeble, Alexander T. Archibald
Summary: This study proposes a data-driven method for defining coherent ozone regimes using Gaussian mixture modeling (GMM), and applies it to ozone profiles from climate model runs. The results show that the area occupied by tropical ozone regimes expands in future climate projections, especially during austral summer. This suggests that GMM may be a useful method for identifying coherent ozone regimes, particularly in the context of model analysis.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2023)
Article
Environmental Sciences
Le Yuan, Olalekan A. M. Popoola, Christina Hood, David Carruthers, Roderic L. Jones, Haitong Zhe Sun, Huan Liu, Qiang Zhang, Alexander T. Archibald
Summary: Emissions inventories are important for air quality simulations but are often highly uncertain. This study presents a new approach to update and optimize emissions inventories by source sectors, resulting in more accurate posterior emission estimates. The study successfully applies this approach to derive transport sector NOx emissions in the Beijing area, providing independent evidence of trends in traffic emissions. The study also highlights the impact of chemical mechanisms in the models and identifies gaps in the current monitoring site distribution in Beijing.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2022)
Article
Environmental Sciences
Mike J. Newland, Camille Mouchel-Vallon, Richard Valorso, Bernard Aumont, Luc Vereecken, Michael E. Jenkin, Andrew R. Rickard
Summary: This study investigates the impact of the reaction between alkenes and ozone on atmospheric composition. A mechanism construction protocol is proposed for automatic mechanism generation. The protocol accurately predicts the yields of carbonyls, Criegee intermediates, and OH radicals through analysis and evaluation of experimental data.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2022)
Article
Environmental Sciences
Paul T. Griffiths, Lee T. Murray, Guang Zeng, Youngsub Matthew Shin, N. Luke Abraham, Alexander T. Archibald, Makoto Deushi, Louisa K. Emmons, Ian E. Galbally, Birgit Hassler, Larry W. Horowitz, James Keeble, Jane Liu, Omid Moeini, Vaishali Naik, Fiona M. O'Connor, Naga Oshima, David Tarasick, Simone Tilmes, Steven T. Turnock, Oliver Wild, Paul J. Young, Prodromos Zanis
Summary: The study analyzed the evolution of tropospheric ozone from 1850 to 2100 using CMIP6 data, finding that the models were able to reproduce key spatial, seasonal, and decadal variability and trends observed in the past several decades. The average model ensemble showed an increase in tropospheric ozone burden from 1850 to 2005-2014, with a projected further increase in the ssp370 experiment up to 2100.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2021)
Article
Green & Sustainable Science & Technology
Zhe Sun, Alexander T. Archibald
Summary: Improving the accuracy of global surface ozone predictions is crucial, and conventional ensemble learning methods and 2-stage enhanced space-time Bayesian neural network have shown outstanding performances. The traditional approach is computationally cheaper and results in higher performance, but has the drawback of overestimating oceanic ozone and being less interpretable. The Bayesian approach performs better in spatial generalisation and interpretability, but comes with heavier computational burdens.
ENVIRONMENTAL SCIENCE AND ECOTECHNOLOGY
(2021)
Article
Environmental Sciences
John Staunton-Sykes, Thomas J. Aubry, Youngsub M. Shin, James Weber, Lauren R. Marshall, Nathan Luke Abraham, Alex Archibald, Anja Schmidt
Summary: This study shows that the co-emission of volcanic halogens with sulfur into the stratosphere significantly increases the volcanic effective radiative forcing, resulting in stratospheric cooling and reduced aerosol growth. The inclusion of halogen emissions in simulations of explosive eruptions is important to better understand the climate impacts, including significant reductions in ozone, methane, and water vapor levels in the stratosphere.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2021)
Article
Environmental Sciences
Peter Sherman, Meng Gao, Shaojie Song, Alex T. Archibald, Nathan Luke Abraham, Jean-Francois Lamarque, Drew Shindell, Gregory Faluvegi, Michael B. McElroy
Summary: The study highlights the uncertainty in the impact of aerosols on the Bay of Bengal summer monsoon precipitation, showing that increased sulfate emissions reduce precipitation in India. However, a significant increase in precipitation is only observed when both Indian and Chinese sulfur emissions are regulated.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2021)
