Browsing Kjemisk institutt by Author "Wisthaler, Armin"

Now showing items 41-59 of 59

  • Next-Generation Isoprene Measurements From Space: Detecting Daily Variability at High Resolution 
    Wells, K.C.; Millet, D.B.; Payne, V.H.; Vigouroux, C.; Aquino, C.A.B.; De Mazière, Maziere; de Gouw, J.A.; Graus, M.; Kurosu, T.; Warneke, C.; Wisthaler, Armin (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Isoprene is the dominant nonmethane organic compound emitted to the atmosphere, where it drives ozone and aerosol production, modulates atmospheric oxidation, and interacts with the global nitrogen cycle. Isoprene emissions ...
  • Nighttime and daytime dark oxidation chemistry in wildfire plumes: An observation and model analysis of FIREX-AQ aircraft data 
    Decker, Zachary C. J.; Robinson, Michael A.; Barsanti, Kelley C.; Bourgeois, Ilann; Coggon, Matthew M.; Digangi, Joshua P.; Diskin, Glenn S.; Flocke, Frank M.; Franchin, Alessandro; Fredrickson, Carley D.; Gkatzelis, Georgios I.; Hall, Samuel R.; Halliday, Hannah; Holmes, Christopher D.; Huey, L. Gregory; Lee, Young Ro; Lindaas, Jakob; Middlebrook, Ann M.; Montzka, Denise D.; Moore, Richard; Neuman, J. Andrew; Nowak, John B.; Palm, Brett B.; Peischl, Jeff; Piel, Felix Maximilian; Rickly, Pamela S.; Rollins, Andrew W.; Ryerson, Thomas B.; Schwantes, Rebecca H.; Sekimoto, Kanako; Thornhill, Lee; Thornton, Joel A.; Tyndall, Geoffrey S.; Ullmann, Kirk; Van Rooy, Paul; Veres, Patrick R.; Warneke, Carsten; Washenfelder, Rebecca A.; Weinheimer, Andrew J.; Wiggins, Elizabeth; Winstead, Edward; Wisthaler, Armin; Womack, Caroline; Brown, Steven S. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Wildfires are increasing in size across the western US, leading to increases in human smoke exposure and associated negative health impacts. The impact of biomass burning (BB) smoke, including wildfires, on regional air ...
  • Observation-based modeling of ozone chemistry in the Seoul metropolitan area during the Korea-United States Air Quality Study (KORUS-AQ) 
    Schroeder, Jason R.; Crawford, James H.; Ahn, Joon-Young; Chang, Limseok; Fried, Alan; Walega, James; Weinheimer, Andrew; Montzka, Denise D.; Hall, Samuel R.; Ullmann, Kirk; Wisthaler, Armin; Mikoviny, Tomas; Chen, Gao; Blake, Donald R.; Blake, Nicola J.; Hughes, Stacey C.; Meinardi, Simone; Diskin, Glenn; Digangi, Joshua P.; Choi, Yonghoon; Pusede, Sally E.; Huey, Greg L.; Tanner, David J.; Kim, Michelle; Wennberg, Paul O. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    The Seoul Metropolitan Area (SMA) has a population of 24 million and frequently experiences unhealthy levels of ozone (O3). In this work, measurements taken during the Korea-United States Air Quality Study (KORUS-AQ, 2016) ...
  • Observations of atmospheric oxidation and ozone production in South Korea 
    Brune, William H.; Miller, David O.; Thames, Alexander B.; Brosius, Alexandra L.; Barletta, Barbara; Blake, Donald R.; Blake, Nicola J.; Chen, Gao; Choi, Yonghoon; Crawford, James H.; Digangi, Joshua P.; Diskin, Glenn; Fried, Alan; Hall, Samuel R.; Hanisco, Thomas F.; Huey, Greg L.; Hughes, Stacey C.; Kim, Michelle; Meinardi, Simone; Montzka, Denise D.; Pusede, Sally E.; Schroeder, Jason R.; Teng, Alex; Tanner, David J.; Ullmann, Kirk; Walega, James; Weinheimer, Andrew; Wisthaler, Armin; Wennberg, Paul O. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    South Korea routinely experiences poor air quality with ozone and small particles exceeding air quality standards. To build a better understanding of this problem, in 2016, the KORea-United States cooperative Air Quality ...
  • Observed versus simulated OH reactivity during KORUS-AQ campaign: Implications for emission inventory and chemical environment in East Asia 
    Kim, Hyeonmin; Park, Rokjin J.; Kim, Saewung; Brune, William H.; Diskin, Glenn S.; Fried, Alan; Hall, Samuel R.; Weinheimer, Andrew J.; Wennberg, Paul; Wisthaler, Armin; Blake, Donald R.; Ullmann, Kirk (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    We present a holistic examination of tropospheric OH reactivity (OHR) in South Korea using comprehensive NASA DC-8 airborne measurements collected during the Korea–United States Air Quality field study and chemical transport ...
  • On the development of a new prototype PTR-ToF-MS instrument and its application to the detection of atmospheric amines 
    Håland, Alexander; Mikoviny, Tomas; Syse, Elisabeth Emilie; Wisthaler, Armin (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    We herein report on the development of a new prototype PTR-ToF-MS (proton-transfer-reaction time-of-flight mass spectrometry) instrument that combines a hollow cathode glow discharge (HCGD) ion source with a focusing ...
  • On the sources and sinks of atmospheric VOCs: an integratedanalysis of recent aircraft campaigns over North America 
    Chen, Xin; Millet, Dylan B.; Singh, Hanwant B.; Wisthaler, Armin; Apel, Eric C.; Atlas, Elliot L.; Blake, Donald R.; Bourgeois, Ilann; Brown, Steven S.; Crounse, John D.; de Gouw, Joost A.; Flocke, Frank M.; Fried, Alan; Heikes, Brian G.; Hornbrook, Rebecca S.; Mikoviny, Tomas; Min, Kyung-Eun; Müller, Markus; Neuman, J. Andrew; O’Sullivan, Daniel W.; Peischl, Jeff; Pfister, Gabriele G.; Richter, Dirk; Roberts, James M.; Ryerson, Thomas B.; Shertz, Stephen R.; Thompson, Chelsea R.; Treadaway, Victoria; Veres, Patrick R.; Walega, James; Warneke, Carsten; Washenfelder, Rebecca A.; Weibring, Petter K.A.; Yuan, Bin (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    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 ...
  • Online monitoring of volatile organic compounds emitted from human bronchial epithelial cells as markers for oxidative stress 
    Cassagnes, L.E.; Leni, Z.; Håland, Alexander; Bell, D.M.; Zhu, Liang; Bertrand, A.; Baltensperger, Urs; El Haddad, Imad; Wisthaler, Armin; Geiser, Marianne; Dommen, Josef (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Particulate air pollution is associated with adverse respiratory effects and is a major factor for premature deaths. In-vitro assays are commonly used for investigating the direct cytotoxicity and inflammatory impacts due ...
  • Performance of an amine-based CO2 capture pilot plant at the Fortum Oslo Varme Waste to Energy plant in Oslo, Norway 
    Fagerlund, Johan; Zevenhoven, Ron; Thomassen, Jørgen; Tednes, Marius; Abdollahi, Farhang; Thomas, Laurent; Nielsen, Claus Jørgen; Mikoviny, Tomas; Wisthaler, Armin; Zhu, Liang; Biliyok, Chet; Zhurkin, Andrey (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Fortum Oslo Varme AS (FOV) decided (in July 2018) to build a 1:350 scale pilot plant to demonstrate that the selected Shell’s CANSOLV capture technology using solvent DC-103 is suitable for cleaning CO₂ from the exhaust ...
  • Photochemical evolution of the 2013 California Rim Fire: Synergistic impacts of reactive hydrocarbons and enhanced oxidants 
    Wolfe, Glenn M.; Hanisco, Thomas F.; Arkinson, Heather L.; Blake, Donald R.; Wisthaler, Armin; Mikoviny, Tomas; Ryerson, Thomas B.; Pollack, Ilana; Peischl, Jeff; Wennberg, Paul O.; Crounse, John D.; St. Clair, Jason M.; Teng, Alex; Huey, L. Gregory; Liu, Xiaoxi; Fried, Alan; Weibring, Petter; Richter, Dirk; Walega, James; Hall, Samuel R.; Ullmann, Kirk; Jimenez, Jose L.; Campuzano-Jost, Pedro; Bui, T. Paul; Diskin, Glenn; Podolske, James R.; Sachse, Glen; Cohen, Ronald C. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Large wildfires influence regional atmospheric composition, but chemical complexity challenges model predictions of downwind impacts. Here, we elucidate key connections within gas-phase photochemistry and assess novel ...
  • The reactions of N-methylformamide and N,N-dimethylformamide with OH and their photo-oxidation under atmospheric conditions: experimental and theoretical studies 
    Bunkan, Arne Joakim Coldevin; Hetzler, Jens; Mikoviny, Tomas; Wisthaler, Armin; Nielsen, Claus Jørgen; Olzmann, Matthias (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2015)
    The reactions of OH radicals with CH3NHCHO (N-methylformamide, MF) and (CH3)2NCHO (N,N-dimethylformamide, DMF) have been studied by experimental and computational methods. Rate coefficients were determined as a function ...
  • Room temperature rate coefficients for the reaction of chlorine atoms with a series of volatile methylsiloxanes (L2-L5, D3-D6) 
    Geetha, Anjitha Sarachandra Kumar; Mikoviny, Tomas; Piel, Felix Maximilian; Wisthaler, Armin (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Abstract The kinetics of chlorine (Cl) atom reactions with a series of volatile methylsiloxanes (VMS) including hexamethyldisiloxane (L2), octamethyltrisiloxane (L3), decamethyltetrasiloxane (L4), dodecamethylpentasiloxane ...
  • A Sampling Line Artifact in Stack Emission Measurement of Alkanolamine-enabled Carbon Capture Facility: Surface Reaction of Amines with Formaldehyde 
    Zhu, Liang; Mikoviny, Tomas; Wisthaler, Armin; Nielsen, Claus Jørgen (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    Laboratory experiments were carried out to study Schiff-base condensation reactions between amines and formaldehyde that occur on inlet lines of emission monitoring instruments. Primary amines and formaldehyde were found ...
  • Taehwa Research Forest: A receptor site for severe domestic pollution events in Korea during 2016 
    Sullivan, John T; McGee, Thomas J; Stauffer, Ryan M; Thompson, Anne M; Weinheimer, Andrew; Knote, Christoph; Janz, Scott; Wisthaler, Armin; Long, Russell; Szykman, James; Park, Jinsoo; Lee, Youngjae; Kim, Saewung; Jeong, Daun; Sanchez, Dianne; Twigg, Laurence; Sumnicht, Grant; Knepp, Travis; Schroeder, Jason R. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    During the May–June 2016 International Cooperative Air Quality Field Study in Korea (KORUS-AQ), light synoptic meteorological forcing facilitated Seoul metropolitan pollution outflow to reach the remote Taehwa Research ...
  • The reaction of organic peroxy radicals with unsaturated compounds controlled by a non-epoxide pathway under atmospheric conditions 
    Nozière, Barbara; Durif, Olivier; Dubus, Eloé; Kylington, Stephanie; Emmer, Åsa; Fache, Fabienne; Piel, Felix Maximilian; Wisthaler, Armin (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Reactions of organic peroxy radicals (RO 2 ) with alkenes at room temperature were found to proceed by the formation of large peroxy radicals (ROO-R’O 2 ) instead of epoxides, which was reported until now for these reactions ...
  • Top-down estimates of anthropogenic VOC emissions in South Korea using formaldehyde vertical column densities from aircraft during the KORUS-AQ campaign 
    Kwon, Hyeong-Ahn; Park, Rokjin; Oak, Yujin J.; Nowlan, Caroline R.; Janz, Scott; Kowalewski, Matthew G.; Fried, Alan; Walega, James; Bates, Kelvin H.; Choi, Jinkyul; Blake, Donald R.; Wisthaler, Armin; Woo, Jung-Hun (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Nonmethane volatile organic compounds (NMVOCs) result in ozone and aerosol production that adversely affects the environment and human health. For modeling purposes, anthropogenic NMVOC emissions have been typically compiled ...
  • Towards a satellite formaldehyde - In situ hybrid estimate for organic aerosol abundance 
    Liao, Jin; Hanisco, Thomas F.; Wolfe, Glenn M.; Clair, Jason M. St.; Jimenez, José L.; Campuzano-Jost, Pedro; Nault, Benjamin A.; Fried, Alan; Marais, Eloise A.; Gonzalez Abad, Gonzalo; Chance, Kelly V.; Jethva, Hiren T; Ryerson, Thomas B.; Warneke, Carsten; Wisthaler, Armin (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    Organic aerosol (OA) is one of the main components of the global particulate burden and intimately links natural and anthropogenic emissions with air quality and climate. It is challenging to accurately represent OA in ...
  • Ultrahigh Sensitivity PTR-MS Instrument with a Well-Defined Ion Chemistry 
    Reinecke, Tobias; Leiminger, Markus; Jordan, Alfons; Wisthaler, Armin; Müller, Markus (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Proton-transfer-reaction mass spectrometry (PTR-MS) is widely used for measuring organic trace gases in air. In traditional PTR-MS, both nonpolar and polar analytes are ionized with unit efficiency, as predicted from ...
  • Using Observations and Source-Specific Model Tracers to Characterize Pollutant Transport During FRAPPE and DISCOVER-AQ 
    Pfister, GG; Reddy, PJ; Barth, MC; Flocke, FF; Fried, A; Herndon, SC; Sive, Barkley C.; Sullivan, JT; Thompson, A.M; Yacovitch, TI; Weinheimer, A.J.; Wisthaler, Armin (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    Transport is a key parameter in air quality research and plays a dominant role in the Colorado Northern Front Range Metropolitan Area (NFRMA), where terrain-induced flows and recirculation patterns can lead to vigorous ...