Armin Wisthaler

• Coggon, Matthew M.; Stockwell, Chelsea E.; Claflin, Megan S.; Pfannerstill, Eva Y.; Xu, Lu & Gilman, Jessica B. [Vis alle 24 forfattere av denne artikkelen] (2024). Identifying and correcting interferences to PTR-ToF-MS measurements of isoprene and other urban volatile organic compounds. Atmospheric Measurement Techniques. ISSN 1867-1381. 17(2), s. 801–825. doi: 10.5194/amt-17-801-2024.
• Decker, Zachary C. J.; Novak, Gordon A.; Aikin, Kenneth; Veres, Patrick R.; Neuman, J. Andrew & Bourgeois, Ilann [Vis alle 52 forfattere av denne artikkelen] (2024). Airborne Observations Constrain Heterogeneous Nitrogen and Halogen Chemistry on Tropospheric and Stratospheric Biomass Burning Aerosol. Geophysical Research Letters. ISSN 0094-8276. 51(4). doi: 10.1029/2023GL107273.
• Gkatzelis, Georgios I.; Coggon, Matthew M.; Stockwell, Chelsea E.; Hornbrook, Rebecca S.; Allen, Hannah & Apel, Eric C. [Vis alle 65 forfattere av denne artikkelen] (2024). Parameterizations of US wildfire and prescribed fire emission ratios and emission factors based on FIREX-AQ aircraft measurements. Atmospheric Chemistry and Physics (ACP). ISSN 1680-7316. 24(2), s. 929–956. doi: 10.5194/acp-24-929-2024.
• Tan, Wen; Zhu, Liang; Mikoviny, Tomas; Nielsen, Claus Jørgen; Wisthaler, Armin & D'Anna, Barbara [Vis alle 13 forfattere av denne artikkelen] (2023). Experimental and Theoretical Study of the OH-Initiated Degradation of Piperidine under Simulated Atmospheric Conditions. Journal of Physical Chemistry A. ISSN 1089-5639. 128(14), s. 2789–2814. doi: 10.1021/acs.jpca.3c08415.
• Lannuque, Victor; D'Anna, Barbara; Kostenidou, Evangelia; Couvidat, Florian; Martinez-Valiente, Alvaro & Eichler, Philipp [Vis alle 11 forfattere av denne artikkelen] (2023). Gas-particle partitioning of toluene oxidation products: An experimental and modeling study. Atmospheric Chemistry and Physics (ACP). ISSN 1680-7316. 23(24), s. 15537–15560. doi: 10.5194/acp-23-15537-2023. Fulltekst i vitenarkiv
• Yang, Aileen; Andersen, Kamilla Heimar; Hak, Claudia; Mikoviny, Tomas; Wisthaler, Armin & Holøs, Sverre Bjørn (2023). Effect of demand-controlled ventilation strategies on indoor air pollutants in a classroom: A Norwegian case study. Journal of Physics: Conference Series (JPCS). ISSN 1742-6588. 2654. doi: 10.1088/1742-6596/2654/1/012087. Fulltekst i vitenarkiv
• Pagonis, Demetrios; Selimovic, Vanessa; Campuzano-Jost, Pedro; Guo, Hongyu; Day, Douglas A. & Schueneman, Melinda K. [Vis alle 29 forfattere av denne artikkelen] (2023). Impact of Biomass Burning Organic Aerosol Volatility on Smoke Concentrations Downwind of Fires. Environmental Science and Technology. ISSN 0013-936X. 57(44), s. 17011–17021. doi: 10.1021/acs.est.3c05017.
• Elihn, Karine; Dalmijn, Joost; Froment, Jean Francois; Håland, Alexander; Johansson, Jana H. & Karlsson, Hanna L. [Vis alle 16 forfattere av denne artikkelen] (2023). Air quality impacts of a large waste fire in Stockholm, Sweden. Atmospheric Environment. ISSN 1352-2310. 315. doi: 10.1016/j.atmosenv.2023.120124. Fulltekst i vitenarkiv
• Reinecke, Tobias; Leiminger, Markus; Jordan, Alfons; Wisthaler, Armin & Müller, Markus (2023). Ultrahigh Sensitivity PTR-MS Instrument with a Well-Defined Ion Chemistry. Analytical Chemistry. ISSN 0003-2700. 95(32), s. 11879–11884. doi: 10.1021/acs.analchem.3c02669. Fulltekst i vitenarkiv
• Jo, Duseong S.; Emmons, Louisa K.; Callaghan, Patrick; Tilmes, Simone; Woo, Jung-Hun & Kim, Younha [Vis alle 18 forfattere av denne artikkelen] (2023). Comparison of Urban Air Quality Simulations During the KORUS-AQ Campaign With Regionally Refined Versus Global Uniform Grids in the Multi-Scale Infrastructure for Chemistry and Aerosols (MUSICA) Version 0. Journal of Advances in Modeling Earth Systems. ISSN 1942-2466. 15(7). doi: 10.1029/2022MS003458. Fulltekst i vitenarkiv
• Tomsche, Laura; Piel, Felix Maximilian; Mikoviny, Tomas; Nielsen, Claus Jørgen; Guo, Hongyu & Campuzano-Jost, Pedro [Vis alle 17 forfattere av denne artikkelen] (2023). Measurement report: Emission factors of NH3 and NHx for wildfires and agricultural fires in the United States. Atmospheric Chemistry and Physics (ACP). ISSN 1680-7316. 23(4), s. 2331–2343. doi: 10.5194/acp-23-2331-2023. Fulltekst i vitenarkiv
• Souri, Amir H.; Johnson, Matthew S.; Wolfe, Glenn M.; Crawford, James H.; Fried, Alan & Wisthaler, Armin [Vis alle 24 forfattere av denne artikkelen] (2023). Characterization of errors in satellite-based HCHO / NO2 tropospheric column ratios with respect to chemistry, column-to-PBL translation, spatial representation, and retrieval uncertainties. Atmospheric Chemistry and Physics (ACP). ISSN 1680-7316. 23(3), s. 1963–1986. doi: 10.5194/acp-23-1963-2023. Fulltekst i vitenarkiv
• Geetha, Anjitha Sarachandra Kumar; Mikoviny, Tomas; Piel, Felix Maximilian & Wisthaler, Armin (2023). Room temperature rate coefficients for the reaction of chlorine atoms with a series of volatile methylsiloxanes (L<inf>2</inf>-L<inf>5</inf>, D<inf>3</inf>-D<inf>6</inf>). International Journal of Chemical Kinetics. ISSN 0538-8066. 55(9), s. 570–576. doi: 10.1002/kin.21657. Fulltekst i vitenarkiv
• Gallo, Francesca; Sanchez, Kevin J.; Anderson, Bruce E.; Bennett, Ryan; Brown, Matthew D. & Crosbie, Ewan C. [Vis alle 19 forfattere av denne artikkelen] (2023). Measurement report: Aerosol vertical profiles over the western North Atlantic Ocean during the North Atlantic Aerosols and Marine Ecosystems Study (NAAMES). Atmospheric Chemistry and Physics (ACP). ISSN 1680-7316. 23(2), s. 1465–1490. doi: 10.5194/acp-23-1465-2023. Fulltekst i vitenarkiv
• Yu, Jinhyeok; Han, Kyung M.; Song, Chul H.; Lee, Kyunghwa; Lee, Sojin & Kim, Younha [Vis alle 9 forfattere av denne artikkelen] (2023). Evaluation of biogenic emissions from three different vegetation distributions in South Korea. Atmospheric Environment. ISSN 1352-2310. 296. doi: 10.1016/j.atmosenv.2023.119588.
• Nozière, Barbara; Durif, Olivier; Dubus, Eloé; Kylington, Stephanie; Emmer, Åsa & Fache, Fabienne [Vis alle 8 forfattere av denne artikkelen] (2023). The reaction of organic peroxy radicals with unsaturated compounds controlled by a non-epoxide pathway under atmospheric conditions. Physical Chemistry, Chemical Physics - PCCP. ISSN 1463-9076. doi: 10.1039/d2cp05166d. Fulltekst i vitenarkiv
• Lee, Young Ro; Huey, L. Gregory; Tanner, David J.; Takeuchi, Masayuki; Qu, Hang & Liu, Xiaoxi [Vis alle 34 forfattere av denne artikkelen] (2022). An investigation of petrochemical emissions during KORUS-AQ: Ozone production, reactive nitrogen evolution, and aerosol production. Elementa: Science of the Anthropocene. ISSN 2325-1026. 10(1). doi: 10.1525/elementa.2022.00079. Fulltekst i vitenarkiv
• Håland, Alexander; Mikoviny, Tomas; Syse, Elisabeth Emilie & Wisthaler, Armin (2022). On the development of a new prototype PTR-ToF-MS instrument and its application to the detection of atmospheric amines. Atmospheric Measurement Techniques. ISSN 1867-1381. 15(21), s. 6297–6307. doi: 10.5194/amt-15-6297-2022. Fulltekst i vitenarkiv
• Kim, Hyeonmin; Park, Rokjin J.; Kim, Saewung; Brune, William H.; Diskin, Glenn S. & Fried, Alan [Vis alle 12 forfattere av denne artikkelen] (2022). Observed versus simulated OH reactivity during KORUS-AQ campaign: Implications for emission inventory and chemical environment in East Asia. Elementa: Science of the Anthropocene. ISSN 2325-1026. 10(1). doi: 10.1525/elementa.2022.00030. Fulltekst i vitenarkiv
• Carter, Therese S.; Heald, Colette L.; Kroll, Jesse H.; Apel, Eric C.; Blake, Donald & Coggon, Matthew [Vis alle 18 forfattere av denne artikkelen] (2022). An improved representation of fire non-methane organic gases (NMOGs) in models: emissions to reactivity. Atmospheric Chemistry and Physics (ACP). ISSN 1680-7316. 22(18), s. 12093–12111. doi: 10.5194/acp-22-12093-2022. Fulltekst i vitenarkiv
• Schwantes, Rebecca H.; Lacey, Forrest G.; Tilmes, Simone; Emmons, Louisa K.; Lauritzen, Peter H. & Walters, Stacy [Vis alle 33 forfattere av denne artikkelen] (2022). Evaluating the Impact of Chemical Complexity and Horizontal Resolution on Tropospheric Ozone Over the Conterminous US With a Global Variable Resolution Chemistry Model. Journal of Advances in Modeling Earth Systems. ISSN 1942-2466. 14(6). doi: 10.1029/2021MS002889. Fulltekst i vitenarkiv
• Bunkan, Arne Joakim Coldevin; Reijrink, Nina Gwendolyn; Mikoviny, Tomas; Müller, Markus; Nielsen, Claus Jørgen & Zhu, Liang (2022). Atmospheric Chemistry of N-Methylmethanimine (CH<inf>3</inf>N=CH<inf>2</inf>): A Theoretical and Experimental Study. Journal of Physical Chemistry A. ISSN 1089-5639. 126(20), s. 3247–3264. doi: 10.1021/acs.jpca.2c01925. Fulltekst i vitenarkiv
• Stockwell, Chelsea E.; Bela, Megan M.; Coggon, Matthew M.; Wiggins, Elizabeth; Gargulinski, Emily M. & Shingler, Taylor [Vis alle 44 forfattere av denne artikkelen] (2022). Airborne Emission Rate Measurements Validate Remote Sensing Observations and Emission Inventories of Western U.S. Wildfires. Environmental Science and Technology. ISSN 0013-936X. 56(12), s. 7564–7577. doi: 10.1021/acs.est.1c07121.
• Choi, Jinkyul; Henze, Daven K.; Cao, Hansen; Nowlan, Caroline R.; González Abad, Gonzalo & Kwon, Hyeong-Ahn [Vis alle 13 forfattere av denne artikkelen] (2022). An Inversion Framework for Optimizing Non-Methane VOC Emissions Using Remote Sensing and Airborne Observations in Northeast Asia During the KORUS-AQ Field Campaign. Journal of Geophysical Research (JGR): Atmospheres. ISSN 2169-897X. 127(7). doi: 10.1029/2021JD035844. Fulltekst i vitenarkiv
• Wolfe, Glenn M.; Hanisco, Thomas F.; Arkinson, Heather L.; Blake, Donald R.; Wisthaler, Armin & Mikoviny, Tomas [Vis alle 28 forfattere av denne artikkelen] (2022). Photochemical evolution of the 2013 California Rim Fire: Synergistic impacts of reactive hydrocarbons and enhanced oxidants. Atmospheric Chemistry and Physics (ACP). ISSN 1680-7316. 22(6), s. 4253–4275. doi: 10.5194/acp-22-4253-2022. Fulltekst i vitenarkiv
• Wells, K.C.; Millet, D.B.; Payne, V.H.; Vigouroux, C.; Aquino, C.A.B. & De Mazière, Maziere [Vis alle 11 forfattere av denne artikkelen] (2022). Next-Generation Isoprene Measurements From Space: Detecting Daily Variability at High Resolution. Journal of Geophysical Research (JGR): Atmospheres. ISSN 2169-897X. 127(5), s. 1–19. doi: 10.1029/2021JD036181. Fulltekst i vitenarkiv
• Oak, Yujin J.; Park, Rokjin J.; Jo, Duseong S.; Hodzic, Alma; Jimenez, Jose L. & Campuzano-Jost, Pedro [Vis alle 18 forfattere av denne artikkelen] (2022). Evaluation of Secondary Organic Aerosol (SOA) Simulations for Seoul, Korea. Journal of Advances in Modeling Earth Systems. ISSN 1942-2466. 14(2). doi: 10.1029/2021MS002760. Fulltekst i vitenarkiv
• Kim, Dongwook; Cho, Changmin; Jeong, Seokhan; Lee, Soojin; Nault, Benjamin A. & Campuzano-Jost, Pedro [Vis alle 23 forfattere av denne artikkelen] (2022). Field observational constraints on the controllers in glyoxal (CHOCHO) reactive uptake to aerosol. Atmospheric Chemistry and Physics (ACP). ISSN 1680-7316. 22(2), s. 805–821. doi: 10.5194/acp-22-805-2022. Fulltekst i vitenarkiv
• Brune, William H.; Miller, David O.; Thames, Alexander B.; Brosius, Alexandra L.; Barletta, Barbara & Blake, Donald R. [Vis alle 29 forfattere av denne artikkelen] (2022). Observations of atmospheric oxidation and ozone production in South Korea. Atmospheric Environment. ISSN 1352-2310. 269. doi: 10.1016/j.atmosenv.2021.118854. Fulltekst i vitenarkiv
• Decker, Zachary C. J.; Wang, Siyuan; Bourgeois, Ilann; Campuzano-Jost, Pedro; Coggon, Matthew M. & Digangi, Joshua P. [Vis alle 42 forfattere av denne artikkelen] (2021). Novel Analysis to Quantify Plume Crosswind Heterogeneity Applied to Biomass Burning Smoke. Environmental Science and Technology. ISSN 0013-936X. 55(23), s. 15646–15657. doi: 10.1021/acs.est.1c03803.
• Xu, Lu; Crounse, John D.; Vasquez, Krystal T.; Allen, Hannah; Wennberg, Paul O. & Bourgeois, Ilann [Vis alle 55 forfattere av denne artikkelen] (2021). Ozone chemistry in western U.S. wildfire plumes. Science Advances. ISSN 2375-2548. 7(50), s. 1–10. doi: 10.1126/sciadv.abl3648.
• Fagerlund, Johan; Zevenhoven, Ron; Thomassen, Jørgen; Tednes, Marius; Abdollahi, Farhang & Thomas, Laurent [Vis alle 12 forfattere av denne artikkelen] (2021). Performance of an amine-based CO2 capture pilot plant at the Fortum Oslo Varme Waste to Energy plant in Oslo, Norway. International Journal of Greenhouse Gas Control. ISSN 1750-5836. 106, s. 1–14. doi: 10.1016/j.ijggc.2020.103242. Fulltekst i vitenarkiv
• Huangfu, Yibo; Yuan, Bin; Wang, Sihang; Wu, Caihong; He, Xianjun & Qi, Jipeng [Vis alle 14 forfattere av denne artikkelen] (2021). Revisiting Acetonitrile as Tracer of Biomass Burning in Anthropogenic-Influenced Environments. Geophysical Research Letters. ISSN 0094-8276. 48(11). doi: 10.1029/2020GL092322.
• Herrera, Solianna A.; Diskin, Glenn; Harward, Charles; Sachse, Glen W.; De Wekker, Stephan F. J. & Yang, Melissa [Vis alle 10 forfattere av denne artikkelen] (2021). Wintertime Nitrous Oxide Emissions in the San Joaquin Valley of California Estimated from Aircraft Observations. Environmental Science and Technology. ISSN 0013-936X. 55(8), s. 4462–4473. doi: 10.1021/acs.est.0c08418.
• Kwon, Hyeong-Ahn; Park, Rokjin; Oak, Yujin J.; Nowlan, Caroline R.; Janz, Scott & Kowalewski, Matthew G. [Vis alle 13 forfattere av denne artikkelen] (2021). Top-down estimates of anthropogenic VOC emissions in South Korea using formaldehyde vertical column densities from aircraft during the KORUS-AQ campaign. Elementa: Science of the Anthropocene. ISSN 2325-1026. 9(1). doi: 10.1525/elementa.2021.00109. Fulltekst i vitenarkiv
• Pan, Da; Benedict, Katherine B.; Golston, Levi M.; Wang, Rui; Collett, Jeffrey L. & Tao, Lei [Vis alle 15 forfattere av denne artikkelen] (2021). Ammonia Dry Deposition in an Alpine Ecosystem Traced to Agricultural Emission Hotpots. Environmental Science and Technology. ISSN 0013-936X. 55(12), s. 7776–7785. doi: 10.1021/acs.est.0c05749. Fulltekst i vitenarkiv
• Jo, Duseong S.; Hodzic, Alma; Emmons, Louisa; Tilmes, Simone; Schwantes, Rebecca H. & Mills, Michael J. [Vis alle 17 forfattere av denne artikkelen] (2021). Future changes in isoprene-epoxydiol-derived secondary organic aerosol (IEPOX SOA) under the Shared Socioeconomic Pathways: The importance of physicochemical dependency. Atmospheric Chemistry and Physics (ACP). ISSN 1680-7316. 21(5), s. 3395–3425. doi: 10.5194/acp-21-3395-2021. Fulltekst i vitenarkiv
• Piel, Felix; Müller, Markus; Winkler, Klaus; Skytte Af Sätra, Jenny Marie & Wisthaler, Armin (2021). Introducing the extended volatility range proton-Transfer-reaction mass spectrometer (EVR PTR-MS). Atmospheric Measurement Techniques. ISSN 1867-1381. 14(2), s. 1355–1363. doi: 10.5194/amt-14-1355-2021. Fulltekst i vitenarkiv
• Pagonis, Demetrios; Campuzano-Jost, Pedro; Guo, Hongyu; Day, Douglas A.; Schueneman, Melinda K. & Brown, Wyatt L. [Vis alle 22 forfattere av denne artikkelen] (2021). Airborne extractive electrospray mass spectrometry measurements of the chemical composition of organic aerosol. Atmospheric Measurement Techniques. ISSN 1867-1381. 14(2), s. 1545–1559. doi: 10.5194/amt-14-1545-2021.
• Kim, Saewung; Seco, R.; Gu, Dasa; Sanchez, Dianne; Jeong, Daun & Guenther, Alex B. [Vis alle 25 forfattere av denne artikkelen] (2021). The role of a suburban forest in controlling vertical trace gas and OH reactivity distributions-A case study for the Seoul metropolitan area. Faraday discussions. ISSN 1359-6640. 226, s. 537–550. doi: 10.1039/d0fd00081g.
• Guo, Xuehui; Wang, Rui; Pan, Da; Zondlo, Mark A.; Clarisse, Lieven & Van Damme, Martin [Vis alle 30 forfattere av denne artikkelen] (2021). Validation of IASI Satellite Ammonia Observations at the Pixel Scale Using In Situ Vertical Profiles. Journal of Geophysical Research (JGR): Atmospheres. ISSN 2169-897X. 126(9). doi: 10.1029/2020JD033475.
• Decker, Zachary C. J.; Robinson, Michael A.; Barsanti, Kelley C.; Bourgeois, Ilann; Coggon, Matthew M. & Digangi, Joshua P. [Vis alle 44 forfattere av denne artikkelen] (2021). Nighttime and daytime dark oxidation chemistry in wildfire plumes: An observation and model analysis of FIREX-AQ aircraft data. Atmospheric Chemistry and Physics (ACP). ISSN 1680-7316. 21(21), s. 16293–16317. doi: 10.5194/acp-21-16293-2021. Fulltekst i vitenarkiv
• Tan, Wen; Zhu, Liang; Mikoviny, Tomas; Nielsen, Claus Jørgen; Tang, Yizhen & Wisthaler, Armin [Vis alle 15 forfattere av denne artikkelen] (2021). Atmospheric Chemistry of 2-Amino-2-methyl-1-propanol: A Theoretical and Experimental Study of the OH-Initiated Degradation under Simulated Atmospheric Conditions. Journal of Physical Chemistry A. ISSN 1089-5639. 125(34), s. 7502–7519. doi: 10.1021/acs.jpca.1c04898. Fulltekst i vitenarkiv
• Croft, Betty; Martin, Randall V.; Moore, Richard H.; Ziemba, Luke; Crosbie, Ewan & Liu, Hongyu [Vis alle 16 forfattere av denne artikkelen] (2021). Factors controlling marine aerosol size distributions and their climate effects over the northwest Atlantic Ocean region. Atmospheric Chemistry and Physics (ACP). ISSN 1680-7316. 21(3), s. 1889–1916. doi: 10.5194/acp-21-1889-2021. Fulltekst i vitenarkiv
• Simpson, Isobel J.; Blake, Donald R.; Blake, Nicola J.; Meinardi, Simone; Barletta, Barbara & Hughes, Stacey C. [Vis alle 27 forfattere av denne artikkelen] (2020). Characterization, sources and reactivity of volatile organic compounds (VOCs) in Seoul and surrounding regions during KORUS-AQ. Elementa: Science of the Anthropocene. ISSN 2325-1026. 8. doi: 10.1525/elementa.434.
• Fried, Alan; Walega, James; Weibring, Petter; Richter, Dirk; Simpson, Isobel J. & Blake, Donald R. [Vis alle 35 forfattere av denne artikkelen] (2020). Airborne formaldehyde and volatile organic compound measurements over the Daesan petrochemical complex on Korea’s northwest coast during the Korea-United States Air Quality study: Estimation of emission fluxes and effects on air quality. Elementa: Science of the Anthropocene. ISSN 2325-1026. 8:121(1), s. 1–28. doi: 10.1525/elementa.2020.121.
• Schroeder, Jason R.; Crawford, James H.; Ahn, Joon-Young; Chang, Limseok; Fried, Alan & Walega, James [Vis alle 25 forfattere av denne artikkelen] (2020). Observation-based modeling of ozone chemistry in the Seoul metropolitan area during the Korea-United States Air Quality Study (KORUS-AQ). Elementa: Science of the Anthropocene. ISSN 2325-1026. 8(1). doi: 10.1525/elementa.400. Fulltekst i vitenarkiv
• Schwantes, Rebecca H.; Emmons, Louisa; Orlando, John J.; Barth, Mary C.; Tyndall, Geoffrey S. & Hall, Samuel R. [Vis alle 11 forfattere av denne artikkelen] (2020). Comprehensive isoprene and terpene gas-phase chemistry improves simulated surface ozone in the southeastern US. Atmospheric Chemistry and Physics (ACP). ISSN 1680-7316. 20(6), s. 3739–3776. doi: 10.5194/acp-20-3739-2020. Fulltekst i vitenarkiv
• Wells, Kelley C.; Millet, Dylan B.; Payne, Vivienne H.; Deventer, M. Julian; Bates, Kelvin H. & De Gouw, Joost [Vis alle 10 forfattere av denne artikkelen] (2020). Satellite isoprene retrievals constrain emissions and atmospheric oxidation. Nature. ISSN 0028-0836. 585(7824), s. 225–233. doi: 10.1038/s41586-020-2664-3.
• H. Souri, Amir; R. Nowlan, Caroline; Gonzalez Abad, Gonzalo; Zhu, Lei; R. Blake, Donald & Fried, Alan [Vis alle 13 forfattere av denne artikkelen] (2020). An inversion of NOx and non-methane volatile organic compound (NMVOC) emissions using satellite observations during the KORUS-AQ campaign and implications for surface ozone over East Asia. Atmospheric Chemistry and Physics (ACP). ISSN 1680-7316. 20(16), s. 9837–9854. doi: 10.5194/acp-20-9837-2020. Fulltekst i vitenarkiv
• Wang, Zelong; Yuan, Bin; Ye, Chenshuo; Roberts, James M.; Wisthaler, Armin & Lin, Yi [Vis alle 27 forfattere av denne artikkelen] (2020). High Concentrations of Atmospheric Isocyanic Acid (HNCO) Produced from Secondary Sources in China. Environmental Science and Technology. ISSN 0013-936X. 54(19), s. 11818–11826. doi: 10.1021/acs.est.0c02843. Fulltekst i vitenarkiv
• Cassagnes, L.E.; Leni, Z.; Håland, Alexander; Bell, D.M.; Zhu, Liang & Bertrand, A. [Vis alle 11 forfattere av denne artikkelen] (2020). Online monitoring of volatile organic compounds emitted from human bronchial epithelial cells as markers for oxidative stress. Journal of Breath Research. ISSN 1752-7155. 15(1). doi: 10.1088/1752-7163/abc055. Fulltekst i vitenarkiv
• Tan, Wen; Zhu, Liang; Mikoviny, Tomas; Nielsen, Claus Jørgen; Wisthaler, Armin & D´Anna, Barbara [Vis alle 14 forfattere av denne artikkelen] (2020). Experimental and Theoretical Study of the OH-Initiated Degradation of Piperazine under Simulated Atmospheric Conditions. Journal of Physical Chemistry A. ISSN 1089-5639. doi: 10.1021/acs.jpca.0c10223. Fulltekst i vitenarkiv
• Chen, Jianjun; Yin, Dazhong; Zhao, Zhan; Kaduwela, Ajith; Avise, Jeremy & DaMassa, John [Vis alle 18 forfattere av denne artikkelen] (2020). Modeling air quality in the San Joaquin valley of California during the 2013 Discover-AQ field campaign. Atmospheric Environment: X. ISSN 2590-1621. 5, s. 1–15. doi: 10.1016/j.aeaoa.2020.100067. Fulltekst i vitenarkiv
• Antonsen, Simen Gjelseth; Bunkan, Arne Joakim Coldevin; Mikoviny, Tomas; Nielsen, Claus Jørgen; Stenstrøm, Yngve H. & Wisthaler, Armin (2020). Atmospheric Chemistry of Methyl Isocyanide – an Experimental and Theoretical Study. Journal of Physical Chemistry A. ISSN 1089-5639. 124(32), s. 6562–6571. doi: 10.1021/acs.jpca.0c05127. Fulltekst i vitenarkiv
• Müller, Markus; Piel, Felix; Gutmann, Rene; Sulzer, Philipp; Hartungen, Eugen & Wisthaler, Armin (2020). A novel method for producing NH4+ reagent ions in the hollow cathode glow discharge ion source of PTR-MS instruments. International Journal of Mass Spectrometry. ISSN 1387-3806. 447:116254, s. 1–4. doi: 10.1016/j.ijms.2019.116254. Fulltekst i vitenarkiv
• Antonsen, Simen Gjelseth; Bunkan, Arne Joakim Coldevin; Mikoviny, Tomas; Nielsen, Claus Jørgen; Stenstrøm, Yngve H. & Wisthaler, Armin (2020). Atmospheric chemistry of diazomethane – an experimental and theoretical study. Molecular Physics. ISSN 0026-8976. s. 1–8. doi: 10.1080/00268976.2020.1718227. Fulltekst i vitenarkiv
• Behrenfeld, Michael J.; Moore, Richard H.; Hostetler, Chris A.; Graff, Jason; Gaube, Peter & Russell, Lynn M. [Vis alle 45 forfattere av denne artikkelen] (2019). The North Atlantic Aerosol and Marine Ecosystem Study (NAAMES): Science motive and mission overview. Frontiers in Marine Science. ISSN 2296-7745. 6:122, s. 1–25. doi: 10.3389/fmars.2019.00122. Vis sammendrag

  The North Atlantic Aerosols and Marine Ecosystems Study (NAAMES) is an interdisciplinary investigation to improve understanding of Earth's ocean ecosystem-aerosol-cloud system. Specific overarching science objectives for NAAMES are to (1) characterize plankton ecosystem properties during primary phases of the annual cycle and their dependence on environmental forcings, (2) determine how these phases interact to recreate each year the conditions for an annual plankton bloom, and (3) resolve how remote marine aerosols and boundary layer clouds are influenced by plankton ecosystems. Four NAAMES field campaigns were conducted in the western subarctic Atlantic between November 2015 and April 2018, with each campaign targeting specific seasonal events in the annual plankton cycle. A broad diversity of measurements were collected during each campaign, including ship, aircraft, autonomous float and drifter, and satellite observations. Here, we present an overview of NAAMES science motives, experimental design, and measurements. We then briefly describe conditions and accomplishments during each of the four field campaigns and provide information on how to access NAAMES data. The intent of this manuscript is to familiarize the broad scientific community with NAAMES and to provide a common reference overview of the project for upcoming publications.

• Chen, Xin; Millet, Dylan B.; Singh, Hanwant B.; Wisthaler, Armin; Apel, Eric C. & Atlas, Elliot L. [Vis alle 34 forfattere av denne artikkelen] (2019). On the sources and sinks of atmospheric VOCs: an integratedanalysis of recent aircraft campaigns over North America. Atmospheric Chemistry and Physics (ACP). ISSN 1680-7316. 19(14), s. 9097–9123. doi: 10.5194/acp-19-9097-2019. Fulltekst i vitenarkiv Vis sammendrag

  We apply a high-resolution chemical transport model (GEOS-Chem CTM) with updated treatment of volatile organic compounds (VOCs) and a comprehensive suite of airborne datasets over North America to (i) characterize the VOC budget and (ii) test the ability of current models to capture the distribution and reactivity of atmospheric VOCs over this region. Biogenic emissions dominate the North American VOC budget in the model, accounting for 70 % and 95 % of annually emitted VOC carbon and reactivity, respectively. Based on current inventories anthropogenic emissions have declined to the point where biogenic emissions are the dominant summertime source of VOC reactivity even in most major North American cities. Methane oxidation is a 2× larger source of nonmethane VOCs (via production of formaldehyde and methyl hydroperoxide) over North America in the model than are anthropogenic emissions. However, anthropogenic VOCs account for over half of the ambient VOC loading over the majority of the region owing to their longer aggregate lifetime. Fires can be a significant VOC source episodically but are small on average. In the planetary boundary layer (PBL), the model exhibits skill in capturing observed variability in total VOC abundance (R2=0.36) and reactivity (R2=0.54). The same is not true in the free troposphere (FT), where skill is low and there is a persistent low model bias (∼ 60 %), with most (27 of 34) model VOCs underestimated by more than a factor of 2. A comparison of PBL : FT concentration ratios over the southeastern US points to a misrepresentation of PBL ventilation as a contributor to these model FT biases. We also find that a relatively small number of VOCs (acetone, methanol, ethane, acetaldehyde, formaldehyde, isoprene + oxidation products, methyl hydroperoxide) drive a large fraction of total ambient VOC reactivity and associated model biases; research to improve understanding of their budgets is thus warranted. A source tracer analysis suggests a current overestimate of biogenic sources for hydroxyacetone, methyl ethyl ketone and glyoxal, an underestimate of biogenic formic acid sources, and an underestimate of peroxyacetic acid production across biogenic and anthropogenic precursors. Future work to improve model representations of vertical transport and to address the VOC biases discussed are needed to advance predictions of ozone and SOA formation.

• Coggon, Matthew M.; Lim, Christopher Y.; Koss, Abigail R.; Sekimoto, Kanako; Yuan, Bin & Gilman, Jessica B. [Vis alle 20 forfattere av denne artikkelen] (2019). OH chemistry of non-methane organic gases (NMOGs) emittedfrom laboratory and ambient biomass burning smoke: evaluatingthe influence of furans and oxygenated aromatics on ozone andsecondary NMOG formation. Atmospheric Chemistry and Physics (ACP). ISSN 1680-7316. 19, s. 14875–14899. doi: 10.5194/acp-19-14875-2019. Vis sammendrag

  Chamber oxidation experiments conducted at theFire Sciences Laboratory in 2016 are evaluated to identifyimportant chemical processes contributing to the hydroxyradical (OH) chemistry of biomass burning non-methaneorganic gases (NMOGs). Based on the decay of primarycarbon measured by proton transfer reaction time-of-flightmass spectrometry (PTR-ToF-MS), it is confirmed that fu-rans and oxygenated aromatics are among the NMOGs emit-ted from western United States fuel types with the highestreactivities towards OH. The oxidation processes and forma-tion of secondary NMOG masses measured by PTR-ToF-MSand iodide-clustering time-of-flight chemical ionization massspectrometry (I-CIMS) is interpreted using a box model em-ploying a modified version of the Master Chemical Mecha-nism (v. 3.3.1) that includes the OH oxidation of furan, 2-methylfuran, 2,5-dimethylfuran, furfural, 5-methylfurfural,and guaiacol. The model supports the assignment of ma-jor PTR-ToF-MS and I-CIMS signals to a series of anhy-drides and hydroxy furanones formed primarily through fu-ran chemistry. This mechanism is applied to a Lagrangianbox model used previously to model a real biomass burn-ing plume. The customized mechanism reproduces the de-cay of furans and oxygenated aromatics and the formationof secondary NMOGs, such as maleic anhydride. Based onmodel simulations conducted with and without furans, it isestimated that furans contributed up to 10 % of ozone andover 90 % of maleic anhydride formed within the first 4 h ofoxidation. It is shown that maleic anhydride is present in a biomass burning plume transported over several days, whichdemonstrates the utility of anhydrides as markers for agedbiomass burning plumes.

• Oak, Yujin J.; Park, Rokjin J; Schroeder, Jason R.; Crawford, James H.; Blake, Donald R. & Weinheimer, Andrew J. [Vis alle 12 forfattere av denne artikkelen] (2019). Evaluation of simulated O3 production efficiency during the KORUS-AQ campaign: Implications for anthropogenic NOx emissions in Korea. Elementa: Science of the Anthropocene. ISSN 2325-1026. 7. doi: 10.1525/elementa.394. Fulltekst i vitenarkiv Vis sammendrag

  We examine O3 production and its sensitivity to precursor gases and boundary layer mixing in Korea by using a 3-D global chemistry transport model and extensive observations during the KORea-US cooperative Air Quality field study in Korea, which occurred in May–June 2016. During the campaign, observed aromatic species onboard the NASA DC-8 aircraft, especially toluene, showed high mixing ratios of up to 10 ppbv, emphasizing the importance of aromatic chemistry in O3 production. To examine the role of VOCs and NOx in O3 chemistry, we first implement a detailed aromatic chemistry scheme in the model, which reduces the normalized mean bias of simulated O3 mixing ratios from –26% to –13%. Aromatic chemistry also increases the average net O3 production in Korea by 37%. Corrections of daytime PBL heights, which are overestimated in the model compared to lidar observations, increase the net O3 production rate by ~10%. In addition, increasing NOx emissions by 50% in the model shows best performance in reproducing O3 production characteristics, which implies that NOx emissions are underestimated in the current emissions inventory. Sensitivity tests show that a 30% decrease in anthropogenic NOx emissions in Korea increases the O3 production efficiency throughout the country, making rural regions ~2 times more efficient in producing O3 per NOx consumed. Simulated O3 levels overall decrease in the peninsula except for urban and other industrial areas, with the largest increase (~6 ppbv) in the Seoul Metropolitan Area (SMA). However, with simultaneous reductions in both NOx and VOCs emissions by 30%, O3 decreases in most of the country, including the SMA. This implies the importance of concurrent emission reductions for both NOx and VOCs in order to effectively reduce O3 levels in Korea.

• Sullivan, John T; McGee, Thomas J; Stauffer, Ryan M; Thompson, Anne M; Weinheimer, Andrew & Knote, Christoph [Vis alle 19 forfattere av denne artikkelen] (2019). Taehwa Research Forest: A receptor site for severe domestic pollution events in Korea during 2016. Atmospheric Chemistry and Physics (ACP). ISSN 1680-7316. 19(7), s. 5051–5067. doi: 10.5194/acp-19-5051-2019. Fulltekst i vitenarkiv
• Piel, Felix; Muller, Markus; Mikoviny, Tomas; Pusede, Sally E. & Wisthaler, Armin (2019). Airborne measurements of particulate organic matter by proton-transfer-reaction mass spectrometry (PTR-MS): a pilot study. Atmospheric Measurement Techniques. ISSN 1867-1381. 12(11), s. 5947–5958. doi: 10.5194/amt-12-5947-2019. Fulltekst i vitenarkiv
• Leglise, Joris; Muller, Markus; Piel, Felix; Otto, Tobias & Wisthaler, Armin (2019). Bulk Organic Aerosol Analysis by Proton-Transfer-Reaction Mass Spectrometry: An Improved Methodology for the Determination of Total Organic Mass, O:C and H:C Elemental Ratios, and the Average Molecular Formula. Analytical Chemistry. ISSN 0003-2700. 91(20), s. 12619–12624. doi: 10.1021/acs.analchem.9b02949.
• Liao, Jin; Hanisco, Thomas F.; Wolfe, Glenn M.; Clair, Jason M. St.; Jimenez, José L. & Campuzano-Jost, Pedro [Vis alle 15 forfattere av denne artikkelen] (2019). Towards a satellite formaldehyde - In situ hybrid estimate for organic aerosol abundance. Atmospheric Chemistry and Physics (ACP). ISSN 1680-7316. 19(5), s. 2765–2785. doi: 10.5194/acp-19-2765-2019. Fulltekst i vitenarkiv
• Cai, Siyi; Zhu, Liang; Wang, Shuxiao; Wisthaler, Armin; Li, Qing & Jiang, Jingkun [Vis alle 7 forfattere av denne artikkelen] (2019). Time-Resolved Intermediate-Volatility and Semivolatile Organic Compound Emissions from Household Coal Combustion in Northern China. Environmental Science and Technology. ISSN 0013-936X. 53(15), s. 9269–9278. doi: 10.1021/acs.est.9b00734.
• Skulberg, Knut Ragnvald; Nyrud, Anders Q.; Goffeng, Lars Ole & Wisthaler, Armin (2019). Health and Exposure to VOCs From Pinewood in Indoor Environments. Frontiers in Built Environment. ISSN 2297-3362. 5. doi: 10.3389/fbuil.2019.00107. Fulltekst i vitenarkiv Vis sammendrag

  As a natural, biological material, wood emits various organic chemical substances, mostly volatile organic compounds (VOCs), very volatile organic compounds (VVOCs) and formaldehyde. When such emissions occur in indoor spaces, concentrations of these substances are higher than concentrations outdoors. Consequently, the level of emissions from building materials are of relevance in relation to their possible health effects. The aim of the study was to test the hypothesis that exposure to VOCs from Scots pine (Pinus sylvestris) might increase mucous membrane symptoms and/or general symptoms, compared to exposure to VOCs from Norway spruce (Picea abies). The study was carried out as a double-blinded, crossover, randomized, controlled trial. The health indicators were measured using objective and subjective methods. The VOC exposure was measured with a proton-transfer-reaction time-of-flight mass spectrometer. Thirty healthy individuals participated. The mean concentration of CO2 inside the chamber in each session varied between 420 ppm and 533 ppm. The temperature and RH varied between 21.5°C and 23.7°C and 12.0% and 24.2%. Ozone was supplied via ventilated outdoor air. The median concentration in outdoor air was 23 μg/m3 (13 ppb). The study was conducted with a statistically significant difference in the exposure to VOCs between the experimental (pine) exposure and the control (spruce) exposure. The mean concentrations of VOCs during the experimental exposure were methanol (31 ppb), acetaldehyde (8 ppb), formic acid (11 ppb), acetone/propanal (14 ppb), acetic acid (14 ppb) and monoterpenes (172 ppb). No difference in health outcome was revealed between the experimental and the control exposure. No inflammatory reactions or sensory irritation were found with exposure to 172 ppb monoterpenes and a low ozone concentration. Low relative humidity may have increased eye blinking in the participants in both exposure situations.

• Kelly, James T.; Parworth, Caroline L.; Zhang, Qi; Miller, David J.; Sun, Kang & Zondlo, Mark A. [Vis alle 19 forfattere av denne artikkelen] (2018). Modeling NH4NO3 Over the San Joaquin Valley During the 2013 DISCOVER‐AQ Campaign . Journal of Geophysical Research (JGR): Atmospheres. ISSN 2169-897X. 123(9), s. 4727–4745. doi: 10.1029/2018JD028290. Fulltekst i vitenarkiv
• Lamb, Kara D.; Perring, Anne E.; Samset, Bjørn Hallvard; Peterson, Dave; Davis, Sean & Anderson, Bruce E. [Vis alle 21 forfattere av denne artikkelen] (2018). Estimating Source Region Influences on Black Carbon Abundance, Microphysics, and Radiative Effect Observed Over South Korea. Journal of Geophysical Research (JGR): Atmospheres. ISSN 2169-897X. 123(23), s. 13527–13548. doi: 10.1029/2018JD029257. Fulltekst i vitenarkiv
• Gkatzelis, Georgios I.; Tillmann, Ralf; Hohaus, Thorsten; Müller, Markus; Eichler, Philipp & Xu, Kang-Ming [Vis alle 13 forfattere av denne artikkelen] (2018). Comparison of three aerosol chemical characterization techniques utilizing PTR-ToF-MS: A study on freshly formed and aged biogenic SOA. Atmospheric Measurement Techniques. ISSN 1867-1381. 11(3), s. 1481–1500. doi: 10.5194/amt-11-1481-2018.
• Brune, William H.; Ren, Xinrong; Zhang, Li; Mao, Jingqiu; Miller, David O. & Anderson, Bruce E. [Vis alle 21 forfattere av denne artikkelen] (2018). Atmospheric oxidation in the presence of clouds during the Deep Convective Clouds and Chemistry (DC3) study. Atmospheric Chemistry and Physics (ACP). ISSN 1680-7316. 18(19), s. 14493–14510. doi: 10.5194/acp-18-14493-2018.
• Huang, Jianbei; Hartmann, Henrik; Hellén, Heidi; Wisthaler, Armin; Perreca, Erica & Weinhold, Alexander [Vis alle 11 forfattere av denne artikkelen] (2018). New perspectives on CO2, temperature, and light effects on BVOC emissions using online measurements by PTR-MS and cavity ring-down spectroscopy. Environmental Science and Technology. ISSN 0013-936X. 52(23), s. 13811–13823. doi: 10.1021/acs.est.8b01435.
• Gkatzelis, Georgios I; Hohaus, Thorsten; Tillmann, Ralf; Gensch, Iulia; Müller, Markus & Eichler, Philipp [Vis alle 15 forfattere av denne artikkelen] (2018). Gas-to-particle partitioning of major biogenic oxidation products: A study on freshly formed and aged biogenic SOA. Atmospheric Chemistry and Physics (ACP). ISSN 1680-7316. 18(17), s. 12969–12989. doi: 10.5194/acp-18-12969-2018.
• Ervens, Barbara; Sorooshian, Armin; Aldhaif, Abdulmonam M; Shingler, Taylor; Crosbie, Ewan & Ziemba, Luke [Vis alle 9 forfattere av denne artikkelen] (2018). Is there an aerosol signature of chemical cloud processing? Atmospheric Chemistry and Physics (ACP). ISSN 1680-7316. 18(21). doi: 10.5194/acp-18-16099-2018.
• Sanchez, Kevin J.; Chen, Chia-Li; Russell, Lynn M.; Betha, Raghu; Liu, Jun & Price, Derek J. [Vis alle 21 forfattere av denne artikkelen] (2018). Substantial seasonal contribution of observed biogenic sulfate particles to cloud condensation nuclei. Scientific Reports. ISSN 2045-2322. 8:3235, s. 1–14. doi: 10.1038/s41598-018-21590-9.
• Jensen, Niels Roland; Gruening, Carsten; Goded, Ignacio; Muller, Markus; Hjorth, Jens & Wisthaler, Armin (2018). Eddy-covariance flux measurements in an Italian deciduous forest using PTR-ToF-MS, PTR-QMS and FIS. International Journal of Environmental Analytical Chemistry. ISSN 0306-7319. 98(8), s. 758–788. doi: 10.1080/03067319.2018.1502758.
• Zhu, Liang; Mikoviny, Tomas; Kolstad Morken, Anne; Tan, Wen & Wisthaler, Armin (2018). A compact and easy-to-use mass spectrometer for online monitoring of amines in the flue gas of a post-combustion carbon capture plant. International Journal of Greenhouse Gas Control. ISSN 1750-5836. 78, s. 349–353. doi: 10.1016/j.ijggc.2018.09.003.
• Schripp, Tobias; Anderson, Bruce; Crosbie, Ewan C.; Moore, Richard; Herrmann, Friederike & Oßwald, Patrick [Vis alle 14 forfattere av denne artikkelen] (2018). Impact of Alternative Jet Fuels on Engine Exhaust Composition during the 2015 ECLIF Ground-Based Measurements Campaign. Environmental Science and Technology. ISSN 0013-936X. 52(8), s. 4969–4978. doi: 10.1021/acs.est.7b06244.
• Kaiser, J.; Jacob, Daniel J.; Zhu, Lei; Travis, Katherine R.; Fisher, Jenny A. & Gonzalez Abad, Gonzalo [Vis alle 12 forfattere av denne artikkelen] (2018). High-resolution inversion of OMI formaldehyde columns to quantify isoprene emission on ecosystem-relevant scales: Application to the southeast US. Atmospheric Chemistry and Physics (ACP). ISSN 1680-7316. 18(8), s. 5483–5497. doi: 10.5194/acp-18-5483-2018.
• Tan, Wen; Zhu, Liang; Mikoviny, Tomas; Nielsen, Claus Jørgen; Wisthaler, Armin & Eichler, Philipp [Vis alle 14 forfattere av denne artikkelen] (2018). Theoretical and experimental study on the reaction of tert-butylamine with OH radicals in the atmosphere. Journal of Physical Chemistry A. ISSN 1089-5639. 122(18), s. 4470–4480. doi: 10.1021/acs.jpca.8b01862.
• Baier, Bianca C; Brune, William H; Miller, David O; Blake, Donald; Long, Russell & Wisthaler, Armin [Vis alle 15 forfattere av denne artikkelen] (2017). Higher measured than modeled ozone production at increased NOx levels in the Colorado Front Range. Atmospheric Chemistry and Physics (ACP). ISSN 1680-7316. 17(18), s. 11273–11292. doi: 10.5194/acp-17-11273-2017. Fulltekst i vitenarkiv
• Liu, Xiaoxi; Huey, L. Gregory; Yokelson, Robert J.; Selimovic, Vanessa; Simpson, Isobel J. & Müller, Markus [Vis alle 38 forfattere av denne artikkelen] (2017). Airborne measurements of western U.S. wildfire emissions: Comparison with prescribed burning and air quality implications. Journal of Geophysical Research (JGR): Atmospheres. ISSN 2169-897X. 122(11), s. 6108–6129. doi: 10.1002/2016JD026315. Fulltekst i vitenarkiv
• Lakey, PSJ; Wisthaler, Armin; Berkemeier, T; Mikoviny, Tomas; Poschl, U & Shiraiwa, M. (2017). Chemical kinetics of multiphase reactions between ozone and human skin lipids: Implications for indoor air quality and health effects. Indoor Air. ISSN 0905-6947. 27(4), s. 816–828. doi: 10.1111/ina.12360.
• Huang, Min; Carmichael, Gregory R.; Crawford, James H.; Wisthaler, Armin; Zhan, Xiwu & Hain, Christopher R [Vis alle 8 forfattere av denne artikkelen] (2017). Biogenic isoprene emissions driven by regional weather predictions using different initialization methods: Case studies during the SEAC4RS and DiSCOVER-AQ airborne campaigns. Geoscientific Model Development. ISSN 1991-959X. 10(8), s. 3085–3104. doi: 10.5194/gmd-10-3085-2017. Fulltekst i vitenarkiv
• Pfister, GG; Reddy, PJ; Barth, MC; Flocke, FF; Fried, A & Herndon, SC [Vis alle 12 forfattere av denne artikkelen] (2017). Using Observations and Source-Specific Model Tracers to Characterize Pollutant Transport During FRAPPE and DISCOVER-AQ. Journal of Geophysical Research (JGR): Biogeosciences. ISSN 2169-8953. 122(19), s. 10510–10538. doi: 10.1002/2017JD027257. Fulltekst i vitenarkiv
• Schroeder, Jason R.; Crawford, James H.; Fried, Alan; Walega, James; Weinheimer, Andrew & Wisthaler, Armin [Vis alle 12 forfattere av denne artikkelen] (2017). New insights into the column CH2O/NO2 ratio as an indicator of near-surface ozone sensitivity. Journal of Geophysical Research (JGR): Biogeosciences. ISSN 2169-8953. 122(16), s. 8885–8907. doi: 10.1002/2017JD026781. Fulltekst i vitenarkiv
• Mikoviny, Tomas; Nielsen, Claus Jørgen; Tan, Wen; Wisthaler, Armin; Zhu, Liang & Morken, Anne Kolstad [Vis alle 7 forfattere av denne artikkelen] (2017). Ambient Measurements of Amines by PTR-QiTOF: Instrument Performance Assessment and Results from Field Measurements in the Vicinity of TCM, Mongstad. Energy Procedia. ISSN 1876-6102. 114, s. 1017–1021. doi: 10.1016/j.egypro.2017.03.1246. Fulltekst i vitenarkiv
• Zhu, Liang; Mikoviny, Tomas; Wisthaler, Armin & Nielsen, Claus Jørgen (2017). A Sampling Line Artifact in Stack Emission Measurement of Alkanolamine-enabled Carbon Capture Facility: Surface Reaction of Amines with Formaldehyde. Energy Procedia. ISSN 1876-6102. 114, s. 1022–1025. doi: 10.1016/j.egypro.2017.03.1247. Fulltekst i vitenarkiv

Se alle arbeider i Cristin

• Gundersen, Cathrine Brecke; Norling, Magnus Dahler; Clayer, Francois; Wennberg, Aina Charlotte; Wisthaler, Armin & Cassiani, Massimo [Vis alle 10 forfattere av denne artikkelen] (2023). Future drinking water levels of nitrosamines and nitramines near a CO2 capture plant (FuNitr).
• Evangeliou, Nikolaos; Yttri, Karl Espen; Herzke, Dorte; Cassiani, Massimo; Eckhardt, Sabine & Kylling, Arve [Vis alle 10 forfattere av denne artikkelen] (2023). Microplastic to be measured at EMEP sites in the frame of MAGIC project.
• Hak, Claudia; Vogt, Matthias; Dauge, Franck Rene; Fjellheim, Øystein; Holøs, Sverre Bjørn & Yang, Aileen [Vis alle 8 forfattere av denne artikkelen] (2019). P-4 Formation of ultrafine particles in a classroom under different ventilation conditions.
• Wisthaler, Armin & Müller, Markus (2019). New Instruments for Direct Sampling and Real-Time Analysis of Particulate Organic Matter in Air.
• Wisthaler, Armin; Eichler, Philipp & Müller, Markus (2018). Direct Sampling and Analysis of Airborne Particulate Organic Matter by Proton-Transfer-Reaction Mass Spectrometry.
• van Hooft, Jessie & Wisthaler, Armin (2023). Plume Chemistry Simulations with the SCICHEM Model. Kjemisk Institutt, Universitetet i Oslo. Vis sammendrag

  Amine-based post-combustion carbon capture is a method used for reducing CO2 emissions from industrial point sources. During this process, amines can be released into the environment and form carcinogenic nitrosamines and nitramines. Consequently, the location where it is safe to build carbon capture facilities depends on the levels of carcinogens, and where in the atmosphere they are formed. In this project, power plant plume fields simulated using the plume chemistry model SCICHEM were compared to published results obtained with the Fluidity-Chem model. Following this, SCICHEM was used to understand the influence of the atmospheric chemical background, the applied atmospheric chemistry scheme and NO emission strength on the chemical evolution of an isolated ship plume. Subsequently, NO, NO2, O3 and OH fields were simulated after NO emission from a hypothetical Waste-to-Energy plant using SCICHEM, first without and later with the emission of the amine piperazine. It was found that SCICHEM cannot simulate plume edge details well, thereby emphasizing the need for more detailed models like the Volumetric Particle Approach model, currently under development at NILU, that was also tested for comparison. Moreover, the application of different chemistry schemes was found to lead to different results. Processes such as ozone titration, HNO3 formation and HONO formation, should be included in the chemistry scheme. The atmospheric chemical background and especially the peroxy radicals therein, e.g. HO2 and CH3C(O)O2, were found to play an important role in OH depletion or formation close to the source. Under low NO emission (i.e. 3.02 g/s), the conventional conception of OH being depleted near the source was found not to be valid. On the contrary, the OH chemistry starts close to the source, resulting in OH formation beginning at 2 km downwind from the source. As a result, piperazine nitrosamine and nitramine levels were found to be highest close to the source. With an emission of 0.032 g/s of piperazine, maximum nitrosamine and nitramine concentrations of 0.97 ng/m3 and 0.72 ng/m3, respectively, were found at surface level approximately 1 to 1.5 km downwind from the source. In the case of additional direct nitrosamine emission, the nitrosamine level increased to up to 1.54 ng/m3 close to the source. Higher NO emissions of 30.2 g/s were found to lower the nitrosamine and nitramine concentrations, and shift the maximum concentration further downwind from the source due to increased OH depletion. Meteorological parameters and background conditions were simplified and kept constant throughout the entire run, which is not realistic. Therefore, improved simulations should be performed using varying background and meteorological conditions that are valid for the locations of interest.

• Solevåg, Silje & Wisthaler, Armin (2023). Emissions of volatile organic compounds from a closed landfill. Kjemisk Institutt. Vis sammendrag

  The emission of volatile organic compounds (VOCs) from landfills is an environmental issue on both the global and local scale. In this study, the emissions of VOCs from Brånåsdalen nedlagte avfallsdeponi (Brånåsen closed landfill, BNA) were investigated by the use of on-site Proton Transfer Reaction-Time of Flight-Mass Spectrometry (PTR-ToF-MS) using a mobile laboratory. The study was divided into environmental and analytical chemistry aims. The environmental chemistry aim was to investigate which signals were detected in the mass spectra of landfill gas and determine which VOCs they could correspond to. 28 VOC signals assigned to five VOC compound classes (aliphatic hydrocarbons, oxygenated VOCs, sulfur VOCs, terpenes and aromatics) were detected and quantified in the landfill gas at BNA in this study. The VOC signals detected and their volume mixing ratios were found to have both temporal and spatial variation. This was attributed to the inhomogeneity of the disposed waste and the difference of the environmental conditions between sampling days. The signal of m/z 33.034, assigned to methanol, was found to be emitted in the highest volume mixing ratio, which corresponded to the results of a previous study. Landfill gas was also measured at a secondary landfill (Grønmo nedlagte avfallsdeponi, GNA) for comparison. The analytical chemistry aim was to compare the main sampling and measurement method of on-site PTR-ToF-MS using a mobile laboratory with two conventional sample collection methods; canister sampling followed by off-site PTR-ToF-MS and adsorption tube sampling followed by off-site gas chromatography-mass spectrometry (GC-MS). Canister sampling followed by off-site PTR-ToF-MS was found to replicate the results of on-site PTR-ToF-MS well. However, the main challenge was the instability of oxygenated VOCs during sample transport and storage and the possibility of sample contamination. Adsorption tube sampling followed by off-site gas GC-MS was found to yield similar volume mixing ratios as on-site PTR-ToF-MS for certain compounds. This method also allowed the identification of the signal of m/z 135.137 from on-site PTR-ToF-MS to β-pinene and 3-carene. Even so, a larger discrepancy was observed between the VOCs detected by adsorption tube sampling followed by off-site gas GC-MS and on-site PTR-ToF-MS. This was due to the formation of artifacts by the reaction of the adsorption material with ozone in ambient air and due to the respective detection limitations of the two analytical methods.

• Tan, Wen; Wisthaler, Armin & Nielsen, Claus Jørgen (2022). The Atmospheric Fate of Selected Amines Emitted from Carbon Capture Facilities. Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Oslo. ISSN 1501-7710. 2022(2529). Vis sammendrag

  The climate crisis necessitates urgent decarbonisation, which can only be achieved through a variety of technologies and solutions. One of them is the chemical capture of CO2 released from industrial point sources and its storage in subsea formations. On an industrial scale, CO2 is currently captured via reaction with amines, which are small organic molecules that “bind” the CO2 in the flue gas and thereby prevent it from entering the atmosphere. However, in this process trace amounts of amines are released into the atmosphere, where they can form particles and other air pollutants (e.g., nitrosamines) that are harmful to human health and the environment. In my work, I have initially explored the capability of an ultra-sensitive mass spectrometer to detect traces of amines in the atmosphere. I have furthermore studied the degradation of three amines (tert-butylamine, 2-Amino-2-methyl-1-propanol, and piperazine) under simulated atmospheric conditions in a large outdoor chamber. The products formed during atmospheric degradation were investigated using state-of-the-art theoretical and experimental methods. One of the main findings was that amines very efficiently form particles in the atmosphere. I have, for the first time, used an advanced mass spectrometer to characterize the chemical composition of the particles formed from the breakdown of amines.

• Sørensen, Markus & Wisthaler, Armin (2021). Monitoring of volatile organic compounds (VOCs) in the urban atmosphere of Oslo. Universitetet i Oslo.
• Syse, Elisabeth Emilie; Wisthaler, Armin & Håland, Alexander (2021). Emissions of methylamines from cattle husbandry. Universitetet i Oslo. Vis sammendrag

  Gaseous amines play an important role in atmospheric chemistry, affecting both climate and human health. They act as precursors to particles and break down to form potentially toxic products. Cattle husbandry have been established as one of the predominant atmospheric sources of gaseous amines, yet little is known about the emission rates of amines in this sector. To increase the basic knowledge in this field, monomethylamine, dimethylamine, and trimethylamine emissions were monitored during winter in a cattle barn at the Livestock Production Research Center of the Norwegian University of Life Sciences at Ås over a period of 46 days using a state-of-the-art mass spectrometer. The aim of this study was to determine amine volume mixing ratios in air and to determine amine emission rates. Trimethylamine (22 ± 11 mg h-1 animal-1) was found to be the most abundant methylamine emitted from the cattle barn, followed by monomethylamine (1.9 ± 0.9 mg h-1 animals-1) and dimethylamine (0.49 ± 0.17 mg h-1 animals-1). For comparison, the emission rate of ammonia was found to be 1.5 ± 0.6 g h-1 animal-1. To the best of my knowledge, this was the first study to determine monomethylamine and dimethylamine emission rates from cattle husbandry. Diurnal profiles and statistical analyses of the three methylamines versus the temperature suggested a temperature dependence of emissions, which was most apparent for monomethylamine. High levels of correlation between the three methylamines and ammonia indicated common sources, animal excrements being the most prominent candidate. However, laboratory measurements suggested silage food as an additional, minor source of trimethylamine.

• Notø, Hanne Ødegaard & Wisthaler, Armin (2021). Investigating Volatile Organic Compound Emissions from Boreal Lake Water Exposed to Ultraviolet Light and Ozone. Universitetet i Oslo. Vis sammendrag

  Inland surface waters are an important part of the global carbon cycle through sedimentation, atmospheric emissions, dissolution of atmospheric carbon dioxide (CO2) and the transport of dissolved carbon in runoff. The surface microlayer (SML) is a thin film on the surface of waters consisting of fatty acids, lipids and other organic compounds which serve as the interface between the hydrosphere and atmosphere. The organic compounds in the SML can photooxidize and constitute a source of reactive organic compounds that contribute to the formation of tropospheric ozone (O3) and secondary organic aerosols, consequently affecting air quality and climate. This study investigated the volatile organic compound (VOC) emissions from ten boreal lake water samples exposed to ultraviolet (UV) light and atmospheric O3. The aim was to study the drivers of VOC emissions and examine if the main source of the emissions was the SML or subsurface water. High emissions of methanol, acetaldehyde, acetone/propanal, hexanal and nonanal were observed. UV light was the main driver of these emissions, and high UV intensities produced higher amounts of VOCs. Emissions of acetone/propanal and pentanal were formed by O3 exposure in one of the lakes studied. There was a correlation between the total organic carbon concentration and the VOC emission levels. The SML did not contribute to higher emissions than the subsurface water.

• Reijrink, Nina Gwendolyn; Nielsen, Claus Jørgen & Wisthaler, Armin (2017). Theoretical and experimental studies of intermediates in the atmospheric degradation of imines: Degradation of methyl methanimine and N-methyl ethanimine by OH radicals. Universitetet i Oslo.

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