Article
Engineering, Environmental
Yue Zhou, Christopher P. West, Anusha P. S. Hettiyadura, Wei Pu, Tenglong Shi, Xiaoying Niu, Hui Wen, Jiecan Cui, Xin Wang, Alexander Laskin
Summary: This study characterized the molecular composition and light-absorbing properties of brown carbon (BrC) in snowpack samples from northern Xinjiang, China. The analysis identified five major types of chromophores in the samples and quantified their contributions to light absorption in the wavelength range of 300-370 nm. The study also revealed that different types of chromophores dominate the absorption at different wavelengths, with oxygenated aromatics and nitroaromatics being the most significant.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Geochemistry & Geophysics
M. A. J. Brown, M. R. Patel, S. R. Lewis, J. A. Holmes, G. J. Sellers, P. M. Streeter, A. Bennaceur, G. Liuzzi, G. L. Villanueva, A. C. Vandaele
Summary: A positive vertical correlation between ozone and water ice on Mars is revealed through observation and simulation, with heterogeneous chemistry potentially impacting ozone abundance. This relationship is crucial for understanding ozone variations in the Martian atmosphere.
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2022)
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
A. Y. H. Wong, J. A. Geddes, J. A. Ducker, C. D. Holmes, S. Fares, A. H. Goldstein, I. Mammarella, J. W. Munger
Summary: Dry deposition can partially explain the changes in ambient ozone during extreme hot and dry episodes. The response of ozone deposition to heat and dry anomalies shows that the increase in non-stomatal conductance may offset the decrease in stomatal conductance, resulting in a smaller net reduction or even net increase in total deposition velocity.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Engineering, Environmental
Guangyi Sun, Xinbin Feng, Runsheng Yin, Feiyue Wang, Che-Jen Lin, Kai Li, Jonas Olof Sommar
Summary: The recent discovery of mass-independent fractionation of even-mass mercury isotopes in the atmosphere suggests that UVC-induced photodissociation of mercuric oxides may be responsible for this phenomenon. This finding has significant implications for understanding mercury biogeochemistry.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Ingo Wohltmann, Daniel Kreyling, Ralph Lehmann
Summary: The Polar SWIFT model is a fast scheme for calculating the chemistry of stratospheric ozone depletion in the polar vortex in winter. It can be used in general circulation models (GCMs) and earth system models (ESMs) to simulate the interaction between the ozone layer and climate. A parameterization of ozone transport is used to obtain the total change of ozone, considering both transport and chemistry.
GEOSCIENTIFIC MODEL DEVELOPMENT
(2022)
Article
Geochemistry & Geophysics
J. Serigano, S. M. Horst, C. He, T. Gautier, R. Yelle, T. T. Koskinen, M. G. Trainer, M. J. Radke
Summary: The Cassini spacecraft's final orbits sampled Saturn's atmosphere and revealed complex mass spectra. The signals included native Saturn species and vaporized ices and higher mass organics believed to be flowing into Saturn's atmosphere from the rings. The analysis of the mass spectra showed that ring material was being deposited into Saturn's equatorial region at a rate of approximately 10(4) kg/s during these observations.
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2022)
Article
Chemistry, Physical
Yanbo Li, Weiye Chen, Long Zhu, Huanhuan Wang, Jiwen Guan, Xiaobin Shan, Fuyi Liu, Zhandong Wang
Summary: The study focused on the photoionization and dissociation processes of BVOC MBO232, demonstrating a rare CH3 migration towards the cation. This phenomenon was explained through quantum chemistry calculations and molecular orbital analysis.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Endocrinology & Metabolism
Ankit Shah, Yujue Wang, Xiaoyang Su, Fredric E. Wondisford
Summary: This study discovered the process of glycerol directly contributing to lactate metabolism. Glycerol's contribution to lactate is higher compared to glucose. This suggests that the importance of glycerol in intermediary metabolism may be underestimated.
METABOLISM-CLINICAL AND EXPERIMENTAL
(2022)
Article
Chemistry, Analytical
Xiangjun Meng, Huanhuan Pang, Fei Sun, Xiaohan Jin, Bohong Wang, Ke Yao, LiAng Yao, Lijuan Wang, Zeping Hu
Summary: Metabolomics is a powerful technology for profiling metabolic phenotypes and exploring metabolic reprogramming, yet limited by detection sensitivity. The novel derivatization method significantly improves detection sensitivity and chromatographic separation capability, enabling routine metabolomic analysis in trace amounts of biospecimens. This method shows great potential in promoting metabolomics and metabolic flux analysis, especially in trace amounts of biospecimens.
ANALYTICAL CHEMISTRY
(2021)
Article
Engineering, Environmental
Reid P. Milstead, Emma R. Horvath, Christina K. Remucal
Summary: Organic matter photooxidation is dependent on its initial composition, with implications for carbon cycling and atmospheric CO(2) flux. This study investigates the relationship between dissolved organic matter (DOM) composition and its susceptibility to partial and complete photooxidation using light exposure experiments and high-resolution mass spectrometry. The results provide insights into the understanding of DOM photooxidation and its implications for carbon cycling in diverse surface waters.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Multidisciplinary Sciences
Paulo Wender P. Gomes, Simone Zuffa, Anelize Bauermeister, Andres Mauricio Caraballo-Rodriguez, Haoqi Nina Zhao, Helena Mannochio-Russo, Cajetan Dogo-isonagie, Om Patel, Paloma Pimenta, Jennifer Gronlund, Stacey Lavender, Shira Pilch, Venda Maloney, Michael North, Pieter C. Dorrestein
Summary: This study compared the molecular profiles of teeth bleached with hydrogen peroxide and peroxymonosulfate using Liquid Chromatography-Tandem Mass Spectrometry. The results showed that the two bleaching methods led to distinct molecular profiles, with diterpenoids being more prevalent after peroxymonosulfate treatment and a greater abundance of alkaloids detected after hydrogen peroxide treatment.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Multidisciplinary
Matthew S. Robinson, Mario Niebuhr, Fabiano Lever, Dennis Mayer, Jan Metje, Markus Guhr
Summary: The ultrafast photo-induced ring opening of the oxirane derivative trans-stilbene oxide was studied using ultrafast UV/UV pump-probe spectroscopy with photo-ion detection. Different probe paths and final states were identified through comparisons between UV power studies and synchrotron-based vacuum ultraviolet (VUV) single-photon ionization studies. Time-dependent features of the parent ion (sub-450 fs decay, (1.5 +/- 0.2) ps, and >100 ps) were observed, along with investigations into fragments related to dehydrogenated diphenylmethane and dehydrogenated methylbenzene.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Milan Oncak, Chi-Kit Siu, Christian van der Linde, Wai Kit Tang, Martin K. Beyer
Summary: The molecular processes behind hydrogen evolution reactions are complex and difficult to understand in macroscopic electrochemical cells. Gas phase models, consisting of metal ions and a small number of water molecules, provide unique opportunities to study the reaction pathways in detail. The mechanisms for hydrogen evolution on the ground state and excited state potential energy surfaces have been analyzed and compared, identifying and characterizing five distinct mechanisms for the evolution of atomic or molecular hydrogen.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Geochemistry & Geophysics
Sarah E. Moran, Sarah M. Horst, Chao He, Michael J. Radke, Joshua A. Sebree, Noam R. Izenberg, Veronique Vuitton, Laurene Flandinet, Francois-Regis Orthous-Daunay, Cedric Wolters
Summary: Triton, the largest moon of the Neptune system, shares similar composition and organic haze layer with the dwarf planet Pluto. By conducting laboratory experiments and analyzing the properties of Triton haze analogs, scientists are able to gain insights into the formation processes of nitrogen-rich celestial bodies in the solar system.
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2022)
Article
Engineering, Chemical
Dhruv Mitroo, Thomas E. Gill, Savannah Haas, Kerri A. Pratt, Cassandra J. Gaston
Summary: This study introduces a Constant Output Dust Generator (CODG) that can simulate the environmental impacts of mineral dust. The CODG design considers the natural physical processes of wind erosion and dust production, generating aerosols consistent with the parent source material.
AEROSOL SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Environmental
Haley M. Royer, Dhruv Mitroo, Sarah M. Hayes, Savannah M. Haas, Kerri A. Pratt, Patricia L. Blackwelder, Thomas E. Gill, Cassandra J. Gaston
Summary: The study found that saline lakebed dust is a source of particulate chloride, generating high concentrations of ClNO2, but the underlying physiochemical factors responsible for observed yields are poorly understood. Single particle and bulk techniques showed that trace highly hygroscopic magnesium and calcium chloride minerals may facilitate ClNO2 formation at low humidity. Furthermore, it was discovered that the composition of the aerosol surface, rather than the bulk, is critical in ClNO2 formation.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Stephen M. McNamara, Qianjie Chen, Jacinta Edebeli, Kathryn D. Kulju, Jasmine Mumpfield, Jose D. Fuentes, Steven B. Bertman, Kerri A. Pratt
Summary: Research shows that saline snow can serve as a source of CINO2, with significance for wintertime inland and coastal snow regions.
ACS EARTH AND SPACE CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Jeffrey L. Spencer, Danielle N. Maxwell, Kaare Ray Sikuaq Erickson, Daniel Wall, Linda Nicholas-Figueroa, Kerri A. Pratt, Ginger Shultz
Summary: U.S. education often presents science from a Western perspective, which makes it difficult for students from different cultures to relate class materials to their own cultures and experiences. Cultural relevance is gaining momentum in education reform to connect classroom content with students' cultures and worldviews. However, there are few examples of culturally relevant instruction in science education. This article describes a collaboration between a tribal college in Alaska and the University of Michigan to explore how culture and context influence the design and implementation of culturally relevant curricular materials for introductory chemistry.
JOURNAL OF CHEMICAL EDUCATION
(2022)
Article
Environmental Sciences
Matthew D. Shupe, Markus Rex, Byron Blomquist, P. Ola G. Persson, Julia Schmale, Taneil Uttal, Dietrich Althausen, Helene Angot, Stephen Archer, Ludovic Bariteau, Ivo Beck, John Bilberry, Silvia Bucci, Clifton Buck, Matt Boyer, Zoe Brasseur, Ian M. Brooks, Radiance Calmer, John Cassano, Vagner Castro, David Chu, David Costa, Christopher J. Cox, Jessie Creamean, Susanne Crewell, Sandro Dahlke, Ellen Damm, Gijs de Boer, Holger Deckelmann, Klaus Dethloff, Marina Duetsch, Kerstin Ebell, Andre Ehrlich, Jody Ellis, Ronny Engelmann, Allison A. Fong, Markus M. Frey, Michael R. Gallagher, Laurens Ganzeveld, Rolf Gradinger, Juergen Graeser, Vernon Greenamyer, Hannes Griesche, Steele Griffiths, Jonathan Hamilton, Guenther Heinemann, Detlev Helmig, Andreas Herber, Celine Heuze, Julian Hofer, Todd Houchens, Dean Howard, Jun Inoue, Hans-Werner Jacobi, Ralf Jaiser, Tuija Jokinen, Olivier Jourdan, Gina Jozef, Wessley King, Amelie Kirchgaessner, Marcus Klingebiel, Misha Krassovski, Thomas Krumpen, Astrid Lampert, William Landing, Tiia Laurila, Dale Lawrence, Michael Lonardi, Brice Loose, Christof Luepkes, Maximilian Maahn, Andreas Macke, Wieslaw Maslowski, Christopher Marsay, Marion Maturilli, Mario Mech, Sara Morris, Manuel Moser, Marcel Nicolaus, Paul Ortega, Jackson Osborn, Falk Paetzold, Donald K. Perovich, Tuukka Petaja, Christian Pilz, Roberta Pirazzini, Kevin Posman, Heath Powers, Kerri A. Pratt, Andreas Preusser, Lauriane Quelever, Martin Radenz, Benjamin Rabe, Annette Rinke, Torsten Sachs, Alexander Schulz, Holger Siebert, Tercio Silva, Amy Solomon, Anja Sommerfeld, Gunnar Spreen, Mark Stephens, Andreas Stohl, Gunilla Svensson, Janek Uin, Juarez Viegas, Christiane Voigt, Peter von der Gathen, Birgit Wehner, Jeffrey M. Welker, Manfred Wendisch, Martin Werner, ZhouQing Xie, Fange Yue
Summary: With the Arctic rapidly changing, there is a crucial need to observe, understand, and model these changes. The MOSAiC expedition successfully documented and characterized various aspects of the Arctic atmospheric system through a comprehensive observational program. The observations revealed the significant influence of atmospheric variability and highlighted the higher temperatures and moisture near the sea ice edge during summer. The obtained data will support further research and modeling capabilities in the Arctic.
ELEMENTA-SCIENCE OF THE ANTHROPOCENE
(2022)
Article
Multidisciplinary Sciences
Rachel M. Kirpes, Ziying Lei, Matthew Fraund, Matthew J. Gunsch, Nathaniel W. May, Tate E. Barrett, Claire E. Moffett, Andrew J. Schauer, Becky Alexander, Lucia M. Upchurch, Swarup China, Patricia K. Quinn, Ryan C. Moffet, Alexander Laskin, Rebecca J. Sheesley, Kerri A. Pratt, Andrew P. Ault
Summary: The impact of atmospheric aerosols on climate depends on the size, composition, and phase of individual particles. This study finds that in the Arctic Ocean, 30% of particles in marine air masses are solid organic-coated ammonium sulfate particles, formed through collision with newly formed sulfate particles. With declining sea ice, this particle source is expected to increase.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Environmental Sciences
Claire E. Moffett, Manisha Mehra, Tate E. Barrett, Matthew J. Gunsch, Kerri A. Pratt, Rebecca J. Sheesley
Summary: As the Arctic continues to change and warm rapidly, it is increasingly important to understand the contribution of organic carbon to Arctic aerosol. This study focuses on identifying potential sources and regional influences on organic aerosol concentrations through chemical and isotopic analysis. The results suggest that both terrestrial and marine sources contribute to contemporary organic aerosol in the Arctic, and that temperature plays a role in aerosol processes.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Meteorology & Atmospheric Sciences
Jamy Y. Lee, Peter K. Peterson, Logan R. Vear, Ryan D. Cook, Amy P. Sullivan, Ellie Smith, Lelia N. Hawkins, Nicole E. Olson, Rachel Hems, Philip K. Snyder, Kerri A. Pratt
Summary: Wildfires have a significant impact on air quality and climate by producing aerosols that affect cloud droplet formation and water-phase reactions. This study found that smoke from biomass burning influenced the composition of cloud water, leading to increased concentrations of particles and specific chemical components. These findings highlight the important influence of smoke on cloud water composition.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2022)
Correction
Multidisciplinary Sciences
John Liggio, Shao-Meng Li, Ralf M. Staebler, Katherine Hayden, Andrea Darlington, Richard L. Mittermeier, Jason O'Brien, Robert McLaren, Mengistu Wolde, Doug Worthy, Felix Vogel
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Daun Jeong, Stephen M. McNamara, Anna J. Barget, Angela R. W. Raso, Lucia M. Upchurch, Sham Thanekar, Patricia K. Quinn, William R. Simpson, Jose D. Fuentes, Paul B. Shepson, Kerri A. Pratt
Summary: Bromine radicals cause ozone depletion and mercury deposition in the Arctic atmosphere. These radicals are primarily formed by the photolysis of molecular bromine, which is photochemically produced in the snowpack. It has been observed that bromine monoxide is present until late Arctic spring. The decrease in reactive bromine species coincides with the increase in air temperature and the onset of snowmelt. Surface snow samples show an increase in bromide concentration. These results highlight the importance of the surface snowpack in bromine recycling and its implications as the melt season arrives earlier.
ACS EARTH AND SPACE CHEMISTRY
(2022)
Article
Environmental Sciences
Timothy Jiang, Mark Gordon, Paul A. Makar, Ralf M. Staebler, Michael Wheeler
Summary: Measurements were conducted in a forest in the Athabasca Oil Sands Region to investigate particle size distributions, particle deposition velocities, and vertical mixing in the canopy. Different sources were identified based on wind direction. Smokestack plumes from oil sands processing facilities had higher number concentrations at 70 nm, while aerosols from open-pit mine faces had peaks near 150 nm and 250 nm. Deposition fluxes were calculated and showed good agreement with previous measurements. Nighttime decoupling of air within and above the forest canopy was observed, with lag times of up to 40 min. Aerosol mass fluxes underestimated the flux magnitude when compared to eddy covariance flux measurements.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(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)
Article
Chemistry, Analytical
JessicaA. Mirrielees, Rachel M. Kirpes, Savannah M. Haas, Carlton D. Rauschenberg, Patricia A. Matrai, Allison Remenapp, Vanessa L. Boschi, Amanda M. Grannas, Kerri A. Pratt, Andrew P. Ault
Summary: This study investigates the chemical composition of sea spray aerosol (SSA) generated in coastal regions using an integrated analytical measurement approach. The findings reveal the diverse chemical composition and morphology of SSA particles. These findings are significant for accurately parameterizing the direct and indirect aerosol effects, as well as understanding the impacts of SSA in estuaries, river outflows, and areas of snow and ice melt.
ACS MEASUREMENT SCIENCE AU
(2022)
Article
Environmental Sciences
Qianjie Chen, Jessica A. Mirrielees, Sham Thanekar, Nicole A. Loeb, Rachel M. Kirpes, Lucia M. Upchurch, Anna J. Barget, Nurun Nahar Lata, Angela R. W. Raso, Stephen M. McNamara, Swarup China, Patricia K. Quinn, Andrew P. Ault, Aaron Kennedy, Paul B. Shepson, Jose D. Fuentes, Kerri A. Pratt
Summary: Sea salt aerosols have a significant impact on the radiation budget and atmospheric composition in the rapidly changing Arctic. This study found that both open leads in Arctic sea ice and blowing snow contribute to the production of sea salt aerosols. Blowing snow conditions led to an increase in aerosol particle concentrations and changes in size distribution.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2022)
Article
Environmental Sciences
Kathryn D. Kulju, Stephen M. McNamara, Qianjie Chen, Hannah S. Kenagy, Jacinta Edebeli, Jose D. Fuentes, Steven B. Bertman, Kerri A. Pratt
Summary: This study examines the impact of local meteorology on the production of ClNO2 and N2O5, two important atmospheric compounds. The results show that atmospheric turbulence, precipitation (snow, rain) and fog, and ground cover (snow-covered and bare ground) have significant effects on the abundances of ClNO2 and N2O5. These findings highlight the importance of considering these meteorological factors in understanding atmospheric chemistry.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2022)