Article
Environmental Sciences
Subin Yoon, Stephanie M. Ortiz, Adelaide E. Clark, Tate E. Barrett, Sascha Usenko, Rachelle M. Duvall, Lea Hildebrandt Ruiz, Jeffrey K. Bean, Cameron B. Faxon, James H. Flynn, Barry L. Lefer, Yu Jun Leong, Robert J. Griffin, Rebecca J. Sheesley
Summary: Understanding the sources and composition of organic carbon in the Houston metropolitan area and the relationship with O-3 and PM concentrations was investigated using chemical mass balance modeling and radiocarbon analysis. Results showed a consistent urban background of contemporary carbon and motor vehicle exhaust, with fossil SOC having a stronger correlation with daily maximum 8 h average O-3 during high PM and O-3 events. Impacts of point source emissions processed by onand off-shore wind cycles likely contribute to peak events for both PM and O-3 in the greater Houston metropolitan area.
ATMOSPHERIC ENVIRONMENT
(2021)
Article
Environmental Sciences
Jianfeng Li, Yuhang Wang, Ruixiong Zhang, Charles Smeltzer, Andrew Weinheimer, Jay Herman, K. Folkert Boersma, Edward A. Celarier, Russell W. Long, James J. Szykman, Ruben Delgado, Anne M. Thompson, Travis N. Knepp, Lok N. Lamsal, Scott J. Janz, Matthew G. Kowalewski, Xiong Liu, Caroline R. Nowlan
Summary: Nitrogen oxides play a crucial role in the formation of ozone and aerosols, impacting human health, global radiation budget, and climate. Observations and model simulations help understand the diurnal and spatial variations of NO2. Discrepancies between observations and simulations require further investigation and adjustment.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2021)
Article
Engineering, Environmental
Muhammad Aamir, Zili Guo, Jiawei Yu, Lu Zhao, Dongmei Xu, Xiaohui Sun, Chao Xu, Lili Niu, Weiping Liu
Summary: This study investigates the behavior and fate of organic pollutants in paddy fields in China using soil samples and analytical techniques. The results show that various factors such as altitude, soil temperature, and pH significantly influence the transformation of these pollutants.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Environmental Sciences
Jonathan D. Smolen, Christopher A. Sparacio, Abigail M. Oakes, Michael T. Hren
Summary: Polycyclic aromatic hydrocarbons (PAHs) are environmental pollutants with mutagenic/carcinogenic properties. This study examines the spatial variations in PAH distributions and isotopic compositions among soils and sediments in Connecticut, USA. The results show that PAHs have relatively consistent distributions, primarily produced by pyrogenesis, with different sources for marine and fluvial samples.
ENVIRONMENTAL EARTH SCIENCES
(2022)
Article
Environmental Sciences
Xue Qiao, Yanping Yuan, Ya Tang, Qi Ying, Hao Guo, Yueying Zhang, Hongliang Zhang
Summary: The Sichuan Basin, with 18 cities, experiences high PM2.5 concentrations mainly due to industrial and residential activities. Reducing emissions from both the Sichuan Basin and non-basin regions, particularly industrial and residential activities, can help mitigate PM2.5 pollution.
ATMOSPHERIC ENVIRONMENT
(2021)
Article
Environmental Sciences
Lixu Jin, Wade Permar, Vanessa Selimovic, Damien Ketcherside, Robert J. Yokelson, Rebecca S. Hornbrook, Eric C. Apel, I-Ting Ku, Jeffrey L. Collett Jr, Amy P. Sullivan, Daniel A. Jaffe, Jeffrey R. Pierce, Alan Fried, Matthew M. Coggon, Georgios I. Gkatzelis, Carsten Warneke, Emily V. Fischer, Lu Hu
Summary: The impact of biomass burning on volatile organic compounds in the atmosphere is uncertain. Using the GEOS-Chem model, researchers found that biomass burning emissions in the western USA varied across different inventories and differed significantly for individual VOCs.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2023)
Article
Environmental Sciences
Lingling Lv, Yingjun Chen, Yong Han, Min Cui, Peng Wei, Mei Zheng, Jingnan Hu
Summary: This study utilized the positive matrix factorization model and organic tracers to analyze PM2.5 pollution sources in Beijing, quantifying the contribution of regional transport. It was found that local emissions are the primary cause of pollution, while regional transport also plays a significant role in haze episodes.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Samuel E. LeBlanc, Michal Segal-Rozenhaimer, Jens Redemann, Connor Flynn, Roy R. Johnson, Stephen E. Dunagan, Robert Dahlgren, Jhoon Kim, Myungje Choi, Arlindo da Silva, Patricia Castellanos, Qian Tan, Luke Ziemba, Kenneth Lee Thornhill, Meloe Kacenelenbogen
Summary: This study investigates the temporal and spatial variability of aerosol optical depth (AOD) and aerosol size over Korea during the 2016 KORUS-AQ atmospheric experiment. The results show that aerosol angstrom ngstrom exponent (AE) and fine-mode fraction (FMF) exhibit higher spatial variability compared to AOD. The findings are important for reducing uncertainties in aerosol direct radiative effect.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2022)
Article
Environmental Sciences
Byeong-Uk Kim, Hyun Cheol Kim, Soontae Kim
Summary: The study demonstrates the necessity of utilizing two sets of modeling with high and low vertical turbulent diffusion values to more comprehensively account for domestic and foreign contributions in developing air quality plans in the Northeast Asian region.
ATMOSPHERIC ENVIRONMENT
(2021)
Article
Environmental Sciences
Tengli Yu, Yong Wang, Jing Huang, Xiao Liu, Jiangbo Li, Wei Zhan
Summary: This study proposes a new model, combining fast Fourier transform and long and short-term memory neural network (FFT-LSTM), for accurate prediction of PM2.5 concentration. By extracting the best common period of each element, the model achieves high accuracy and long-term prediction, and is refined based on regional patterns.
ATMOSPHERIC POLLUTION RESEARCH
(2022)
Article
Environmental Sciences
Jorge Pey, Jose Carlos Cerro
Summary: This study investigates the impact of the COVID-19 pandemic on tropospheric ozone concentrations in southwestern Europe. It found that during the strict lockdown period, there was a significant decline in ozone concentrations, but the decline was lessened in the recovery period. This highlights the need for adequate actions to address air pollution and establish regional cooperation to reduce emissions.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Jie Zhang, Xiao He, Yaqin Gao, Shuhui Zhu, Shengao Jing, Hongli Wang, Jian Zhen Yu, Qi Ying
Summary: The study suggests that aromatic SOA may be underestimated in the model, while the predicted monoterpene SOA shows a stronger correlation with the observed values.
AEROSOL AND AIR QUALITY RESEARCH
(2021)
Article
Environmental Sciences
Ratnakar Swain, Bhabagrahi Sahoo
Summary: The optical remote sensing technique has been effectively applied to monitor real-time water quality parameters, and the developed integrated approach shows promising results in estimating pollutant concentrations during cloudy days.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Meteorology & Atmospheric Sciences
Peng Wang, Weijian Zhou, Xiaohu Xiong, Shugang Wu, Zhenchuan Niu, Yunlong Yu, Jinzhao Liu, Tian Feng, Peng Cheng, Hua Du, Xuefeng Lu, Ning Chen, Yaoyao Hou
Summary: This study estimates the source contributions of CO2 emissions in Chinese megacities by conducting regular observations of atmospheric CO2 mixing ratio and carbon isotope compositions in Xi'an and Beijing during winter. The results show that fossil-fuel sources, particularly coal combustion in Xi'an and natural-gas combustion in Beijing, account for the majority of CO2 emissions in both cities.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2022)
Article
Geography, Physical
Ganghan Kim, Seunghee Lee, Jungho Im, Chang-Keun Song, Jhoon Kim, Myong-in Lee
Summary: The study developed an aerosol data assimilation and forecast system using the WRF-Chem model and 3D-VAR data assimilation method, which improves aerosol forecast skill by assimilating AOD from the GOCI satellite and surface PM observations. The results show that assimilating surface PM has a more significant effect on skill improvement compared to assimilating GOCI AOD.
GISCIENCE & REMOTE SENSING
(2021)
Article
Engineering, Environmental
Joel Dreessen, Xinrong Ren, Daniel Gardner, Katherine Green, Phillip Stratton, John T. Sullivan, Ruben Delgado, Russ R. Dickerson, Michael Woodman, Tim Berkoff, Guillaume Gronoff, Allison Ring
Summary: The OWLETS-2 study found that the concentrations of TNMHC and VOCs on an island site in the northern Chesapeake Bay were 2.1 and 3.4 times higher, respectively, than those at a nearby land site. The chemical differences between the island and land sites were observed both in the air above the water and on the water surface. The VOC and photochemistry patterns at the island site were mainly driven by marine sources, indicating the need for separate ozone abatement strategies for water and land.
JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION
(2023)
Article
Meteorology & Atmospheric Sciences
G. C. Cuchiara, A. Fried, M. C. Barth, M. M. Bela, C. R. Homeyer, J. Walega, P. Weibring, D. Richter, S. Woods, A. Beyersdorf, T. V. Bui, J. Dean-Day
Summary: Convective clouds play a significant role in redistributing trace gases in the atmosphere and removing soluble trace gas precursors. Our study focuses on the wet scavenging of formaldehyde (CH2O), hydrogen peroxide (H2O2), and methyl hydrogen peroxide (CH3OOH) during convective storms in Texas, USA. Using cloud-resolving simulations, we found that the scavenging efficiency of these gases was consistent across different types of convective storms. We also discovered higher ice retention factor for CH2O and unexpected results for CH3OOH, indicating the need for further research.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Article
Meteorology & Atmospheric Sciences
Carsten Warneke, Joshua P. Schwarz, Jack Dibb, Olga Kalashnikova, Gregory Frost, Jassim Al-Saad, Steven S. Brown, Wm Alan Brewer, Amber Soja, Felix C. Seidel, Rebecca A. Washenfelder, Elizabeth B. Wiggins, Richard H. Moore, Bruce E. Anderson, Carolyn Jordan, Tara Yacovitch, Scott C. Herndon, Shang Liu, Toshihiro Kuwayama, Daniel Jaffe, Nancy Johnston, Vanessa Selimovic, Robert Yokelson, David M. Giles, Brent N. Holben, Philippe Goloub, Ioana Popovici, Michael Trainer, Aditya Kumar, R. Bradley Pierce, David Fahey, James Roberts, Emily M. Gargulinski, David A. Peterson, Xinxin Ye, Laura H. Thapa, Pablo E. Saide, Charles H. Fite, Christopher D. Holmes, Siyuan Wang, Matthew M. Coggon, Zachary C. J. Decker, Chelsea E. Stockwell, Lu Xu, Georgios Gkatzelis, Kenneth Aikin, Barry Lefer, Jackson Kaspari, Debora Griffin, Linghan Zeng, Rodney Weber, Meredith Hastings, Jiajue Chai, Glenn M. Wolfe, Thomas F. Hanisco, Jin Liao, Pedro Campuzano Jost, Hongyu Guo, Jose L. Jimenez, James Crawford
Summary: The NOAA/NASA Fire Influence on Regional to Global Environments and Air Quality (FIREX-AQ) experiment aimed to study the impact of fires on regional and global environments and air quality. The experiment measured trace gas and aerosol emissions, observed fire dynamics, assessed fire modeling, and examined connections to ground and satellite observables. The experiment involved aircraft, satellites, mobile laboratories, and ground sites.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Article
Environmental Sciences
Tracey L. Footer, Eben D. Thoma, Nigel Clark, Derek Johnson, Jennifer Nash, Scott C. Herndon
Summary: In April 2018, a study was conducted to measure emissions from pneumatic controllers (PCs) using optical gas imaging (OGI) and full flow sampler (FFS) at oil and natural gas production sites in West Virginia. The study identified and characterized PC systems with excessive emissions caused by maintenance issues or nonoptimized process conditions. The results showed that most LE-IPCs had low emissions, while GPU liquid level IPC systems had higher emissions, especially in sites with high product throughput. The study emphasized the importance of inspection and maintenance practices for reducing emissions from PCs.
ATMOSPHERIC ENVIRONMENT-X
(2023)
Article
Environmental Sciences
Jinhyeok Yu, Kyung M. Han, Chul H. Song, Kyunghwa Lee, Sojin Lee, Younha Kim, Jung-Hun Woo, Saewung Kim, Armin Wisthaler
Summary: This study investigated the impact of different plant functional type (PFT) maps on biogenic emissions in South Korea, and found that the simulation using the PFT map from the Forest Geographic Information System (FGIS) produced the best results.
ATMOSPHERIC ENVIRONMENT
(2023)
Article
Environmental Sciences
John T. Sullivan, Ryan M. Stauffer, Anne M. Thompson, Maria A. Tzortziou, Christopher P. Loughner, Carolyn E. Jordan, Joseph A. Santanello
Summary: Coastal areas are densely populated and economically important regions. Protecting the health of humans and ecosystems in these areas and understanding the impacts of environmental stressors like air pollution is crucial.
Article
Astronomy & Astrophysics
Anne M. Thompson, Debra E. Kollonige, Ryan M. Stauffer, Alexander E. Kotsakis, Nader Abuhassan, Lok N. Lamsal, Robert J. Swap, Donald R. Blake, Amy Townsend-Small, Holli D. Wecht
Summary: The Satellite Coastal and Oceanic Atmospheric Pollution Experiment (SCOAPE) cruise in the Gulf of Mexico was conducted to determine the feasibility of using satellite data to measure air quality in ONG operations. The findings showed that satellite NO2 data can be used to monitor ONG activity, but there are limitations in coastal regions.
EARTH AND SPACE SCIENCE
(2023)
Article
Chemistry, Analytical
Tobias Reinecke, Markus Leiminger, Alfons Jordan, Armin Wisthaler, Markus Mueller
Summary: Traditional PTR-MS is an effective method for measuring organic trace gases in air. However, recently developed ultrahigh sensitivity CIMS analyzers sacrifice unit ionization efficiency for certain analytes. This paper introduces a novel FUSION PTR-TOF 10k instrument that maintains the same universal unit response as conventional PTR-MS analyzers. It achieves high sensitivities and low detection limits, demonstrating sub-pptV detection capability.
ANALYTICAL CHEMISTRY
(2023)
Article
Environmental Sciences
Maurice Roots, John T. Sullivan, Ruben Delgado, Laurence Twigg, Belay Demoz
Summary: This study discusses the use of multiple observation platforms as an integrated monitoring system to characterize and analyze ozone exceedance events in the mid-Atlantic region of the United States. By observing vertically resolved ozone, atmospheric backscatter, winds, as well as surface ozone observations, aerosol optical depth, and air mass transport simulations, the spatiotemporal characteristics and impact mechanisms of the exceedance events were revealed.
ATMOSPHERIC ENVIRONMENT
(2023)
Article
Meteorology & Atmospheric Sciences
Nikolay V. Balashov, Lesley E. Ott, Brad Weir, Sourish Basu, Kenneth J. Davis, Natasha L. Miles, Anne M. Thompson, Ryan M. Stauffer
Summary: This study examines the effects of the 2019 floods in the Midwestern and Southern US on the ability of land ecosystems to absorb CO2. The results show that floods have complex effects on the carbon cycle in different regions, highlighting the need for further research to understand how land ecosystems will respond to climate change.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Article
Meteorology & Atmospheric Sciences
Matthew S. S. Johnson, Amir H. H. Souri, Sajeev Philip, Rajesh Kumar, Aaron Naeger, Jeffrey Geddes, Laura Judd, Scott Janz, Heesung Chong, John Sullivan
Summary: Satellite retrievals of formaldehyde (HCHO) and nitrogen dioxide (NO2) from two satellite sensors (OMI and TROPOMI) were compared to investigate the sensitivity of ozone (O3) production to emissions of nitrogen oxides and volatile organic carbon compounds. The study found that OMI and TROPOMI had high biases in clean environments and more accurate comparisons in moderately polluted to polluted regions. The retrievals of NO2 had similar systematic biases, while the HCHO retrievals differed more, with TROPOMI having lower uncertainty.
ATMOSPHERIC MEASUREMENT TECHNIQUES
(2023)
Article
Meteorology & Atmospheric Sciences
Tara I. Yacovitch, Christoph Dyroff, Joseph R. Roscioli, Conner Daube, J. Barry McManus, Scott C. Herndon
Summary: We present an Aerodyne tunable infrared laser direct absorption spectrometer with a multipass cell for the detection of ethylene oxide (EtO). The monitor achieves high precisions and demonstrates enhancement events of EtO lasting a few hours with peaks as high as 600 ppt. The source of EtO emission is confirmed through mobile near-source measurements.
ATMOSPHERIC MEASUREMENT TECHNIQUES
(2023)
Article
Meteorology & Atmospheric Sciences
John W. Halfacre, Jordan Stewart, Scott C. Herndon, Joseph R. Roscioli, Christoph Dyroff, Tara I. Yacovitch, Michael Flynn, Stephen J. Andrews, Steven S. Brown, Patrick R. Veres, Pete M. Edwards
Summary: In this study, tunable infrared laser direct absorption spectroscopy (TILDAS) was used for sensitive, in situ detection of HCl. The method showed a precision of 7-8 pptv with a detection limit of 21-24 pptv. The accuracy and response time of the method were also demonstrated.
ATMOSPHERIC MEASUREMENT TECHNIQUES
(2023)
Article
Environmental Sciences
Jamy Y. Y. Lee, Conner Daube, Ed Fortner, Nicholas Ellsworth, Nathaniel W. W. May, Jason Tallant, Scott Herndon, Kerri A. A. Pratt
Summary: A prescribed burn was conducted at the University of Michigan Biological Station in October 2017 to study the composition of smoke emissions from common biomass in the north-central United States. The resulting data provided detailed insights into the gas and particle concentration and composition measurements of the burned forest.
ENVIRONMENTAL SCIENCE-ATMOSPHERES
(2023)