Browsing Kjemisk institutt by Author "Wisthaler, Armin"

Now showing items 1-20 of 59

  • A novel method for producing NH4+ reagent ions in the hollow cathode glow discharge ion source of PTR-MS instruments 
    Müller, Markus; MÜller, Markus; Piel, Felix; Gutmann, Rene; Sulzer, Philipp; Hartungen, Eugen; Wisthaler, Armin (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Proton-transfer-reaction mass spectrometry (PTR-MS) is seeing an increased use of NH4+ ions for the detection of amines and labile oxygenated organic compounds. NH4+ ions are usually generated from ammonia or ammonium-containing ...
  • Air quality impacts of a large waste fire in Stockholm, Sweden 
    Elihn, Karine; Dalmijn, Joost; Froment, Jean Francois; Håland, Alexander; Johansson, Jana H.; Karlsson, Hanna L.; Martin, Jonathan W.; Mikoviny, Tomas; Norman, Michael; Piel, Felix Maximilian; Sadiktsis, Ioannis; Schlesinger, Daniel; Silvergren, Sanna; Srikanth Vallabani, N. V; Wisthaler, Armin; Steimer, Sarah S. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Fires in waste facilities are a common occurrence. Since many waste facilities are located adjacent to densely populated areas, these fires could potentially expose large populations to the emitted pollutants. However, at ...
  • Airborne measurements of particulate organic matter by proton-transfer-reaction mass spectrometry (PTR-MS): a pilot study 
    Piel, Felix; Muller, Markus; Mikoviny, Tomas; Pusede, Sally E.; Wisthaler, Armin (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    Herein we report on the first successful airborne deployment of the CHemical Analysis of AeRosol ONline (CHARON) particle inlet which allowed us to measure the chemical composition of atmospheric submicrometer particles ...
  • Airborne measurements of western U.S. wildfire emissions: Comparison with prescribed burning and air quality implications 
    Liu, Xiaoxi; Huey, L. Gregory; Yokelson, Robert J.; Selimovic, Vanessa; Simpson, Isobel J.; Müller, Markus; Jimenez, José L.; Campuzano-Jost, Pedro; Beyersdorf, Andreas J.; Blake, Donald R.; Butterfield, Zachary; Choi, Yonghoon; Crounse, John D.; Day, Douglas A.; Diskin, Glenn S.; Dubey, Manvendra K.; Fortner, Edward; Hanisco, Thomas F.; Hu, Weiwei; King, Laura E.; Kleinman, Lawrence; Meinardi, Simone; Mikoviny, Tomas; Onasch, Timothy B.; Palm, Brett B.; Peischl, Jeff; Pollack, Ilana B.; Ryerson, Thomas B.; Sachse, Glen W.; Sedlacek, Arthur J.; Shilling, John D.; Springston, Stephen; St Clair, Jason M.; Tanner, David J.; Teng, Alexander P.; Wennberg, Paul O.; Wisthaler, Armin; Wolfe, Glenn M. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    Wildfires emit significant amounts of pollutants that degrade air quality. Plumes from three wildfires in the western U.S. were measured from aircraft during the Studies of Emissions and Atmospheric Composition, Clouds and ...
  • Ambient Measurements of Amines by PTR-QiTOF: Instrument Performance Assessment and Results from Field Measurements in the Vicinity of TCM, Mongstad 
    Mikoviny, Tomas; Nielsen, Claus Jørgen; Tan, Wen; Wisthaler, Armin; Zhu, Liang; Morken, Anne Kolstad; Nilsen, Terje Niøten (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    A PTR-QiTOF instrument was deployed in the field in the vicinity of the CO2 Technology Center Mongstad (TCM) for measuring amines in ambient air. The observed single-to-double-digit pptv levels of dimethylamine (DMA) and ...
  • Ammonia Dry Deposition in an Alpine Ecosystem Traced to Agricultural Emission Hotpots 
    Zondlo, Mark A.; Pan, Da; Benedict, Katherine B.; Golston, Levi M.; Wang, Rui; Collett, Jeffrey L.; Tao, Lei; Sun, Kang; Guo, Xuehui; Ham, Jay; Prenni, Anthony J.; Schichtel, B. A.; Mikoviny, Tomas; Müller, Markus; Wisthaler, Armin (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Elevated reactive nitrogen (Nr) deposition is a concern for alpine ecosystems, and dry NH3 deposition is a key contributor. Understanding how emission hotspots impact downwind ecosystems through dry NH3 deposition provides ...
  • An improved representation of fire non-methane organic gases (NMOGs) in models: emissions to reactivity 
    Carter, Therese S.; Heald, Colette L.; Kroll, Jesse H.; Apel, Eric C.; Blake, Donald; Coggon, Matthew; Edtbauer, Achim; Gkatzelis, Georgios; Hornbrook, Rebecca S.; Peischl, Jeff; Pfannerstill, Eva Y.; Piel, Felix Maximilian; Reijrink, Nina G.; Ringsdorf, Akima; Warneke, Carsten; Williams, Jonathan; Wisthaler, Armin; Xu, Lu (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Fires emit a substantial amount of non-methane organic gases (NMOGs), the atmospheric oxidation of which can contribute to ozone and secondary particulate matter formation. However, the abundance and reactivity of these ...
  • An Inversion Framework for Optimizing Non-Methane VOC Emissions Using Remote Sensing and Airborne Observations in Northeast Asia During the KORUS-AQ Field Campaign 
    Choi, Jinkyul; Henze, Daven K.; Cao, Hansen; Nowlan, Caroline R.; González Abad, Gonzalo; Kwon, Hyeong-Ahn; Lee, Hyung-Min; Oak, Yujin J.; Park, Rokjin J.; Bates, Kelvin H.; Maasakkers, Joannes D.; Wisthaler, Armin; Weinheimer, Andrew J. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    We aim to reduce uncertainties in CH2O and other volatile organic carbon (VOC) emissions through assimilation of remote sensing data. We first update a three-dimensional (3D) chemical transport model, GEOS-Chem with the ...
  • 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 
    H. Souri, Amir; R. Nowlan, Caroline; Gonzalez Abad, Gonzalo; Zhu, Lei; R. Blake, Donald; Fried, Alan; J. Weinheimer, Andrew; Wisthaler, Armin; Woo, Jung-Hun; Zhang, Qiang; E. Chan Miller, Christopher; Liu, Xiong; Chance, Kelly (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Abstract. The absence of up-to-date emissions has been a major impediment to accurately simulating aspects of atmospheric chemistry and to precisely quantifying the impact of changes in emissions on air pollution. Hence, ...
  • An investigation of petrochemical emissions during KORUS-AQ: Ozone production, reactive nitrogen evolution, and aerosol production 
    Lee, Young Ro; Huey, L. Gregory; Tanner, David J.; Takeuchi, Masayuki; Qu, Hang; Liu, Xiaoxi; Ng, Nga Lee; Crawford, James H.; Fried, Alan; Richter, Dirk; Simpson, Isobel J.; Blake, Donald R.; Blake, Nicola J.; Meinardi, Simone; Kim, Saewung; Diskin, Glenn S.; Digangi, Joshua P.; Choi, Yonghoon; Pusede, Sally E.; Wennberg, Paul O.; Kim, Michelle J.; Crounse, John D.; Teng, Alex P.; Cohen, Ronald C.; Romer, Paul S.; Brune, William; Wisthaler, Armin; Mikoviny, Tomas; Jimenez, Jose L.; Campuzano-Jost, Pedro; Nault, Benjamin A.; Weinheimer, Andrew; Hall, Samuel R.; Ullmann, Kirk (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Emissions and secondary photochemical products from the Daesan petrochemical complex (DPCC), on the west coast of South Korea, were measured from the NASA DC-8 research aircraft during the Korea-United States Air Quality ...
  • Atmospheric Chemistry of 2-Amino-2-methyl-1-propanol: A Theoretical and Experimental Study of the OH-Initiated Degradation under Simulated Atmospheric Conditions 
    Tan, Wen; Zhu, Liang; Mikoviny, Tomas; Nielsen, Claus Jørgen; Tang, Yizhen; Wisthaler, Armin; Eichler, Philipp; Müller, Markus; D'Anna, Barbara; Farren, Naomi J.; Hamilton, Jacqueline F.; Pettersson, Jan B. C.; Hallquist, Mattias; Antonsen, Simen Gjelseth; Stenstrøm, Yngve H. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    The OH-initiated degradation of 2-amino-2-methyl-1-propanol [CH3C(NH2)(CH3)CH2OH, AMP] was investigated in a large atmospheric simulation chamber, employing time-resolved online high-resolution proton-transfer reaction-t ...
  • Atmospheric chemistry of diazomethane – an experimental and theoretical study 
    Antonsen, Simen Gjelseth; Bunkan, Arne Joakim Coldevin; Mikoviny, Tomas; Nielsen, Claus Jørgen; Stenstrøm, Yngve H.; Wisthaler, Armin; Zardin, Erika (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    The kinetics of the O3, OH and NO3 radical reactions with diazomethane were studied in smog chamber experiments employing long-path FTIR and PTR-ToF-MS detection. The rate coefficients were determined to be k CH2NN+O3 =  ...
  • Atmospheric Chemistry of Methyl Isocyanide – an Experimental and Theoretical Study 
    Antonsen, Simen Gjelseth; Bunkan, Arne Joakim Coldevin; Mikoviny, Tomas; Nielsen, Claus Jørgen; Stenstrøm, Yngve H.; Wisthaler, Armin; Zardin, Erika (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    The reaction of CH3NC with OH radicals was studied in smog chamber experiments employing PTR-ToF-MS and long-path FTIR detection. The rate coefficient was determined to be kCH3NC+OH = (7.9 ± 0.6) × 10–11 cm3 molecule–1 s–1 ...
  • Atmospheric Chemistry of N-Methylmethanimine (CH3N=CH2): A Theoretical and Experimental Study 
    Bunkan, Arne Joakim Coldevin; Reijrink, Nina G.; Mikoviny, Tomas; Müller, Markus; Nielsen, Claus Jørgen; Zhu, Liang; Wisthaler, Armin (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    The OH-initiated photo-oxidation of N-methylmethanimine, CH3N═CH2, was investigated in the 200 m3 EUPHORE atmospheric simulation chamber and in a 240 L stainless steel photochemical reactor employing time-resolved online ...
  • Atmospheric Chemistry of tert-butylamine and AMP 
    Antonsen, Simen Gjelseth; Bunkan, Arne Joakim Coldevin; D'Anna, Barbara; Eichler, Philipp; Farren, Naomi J.; Hallquist, Mattias; Hamilton, Jacquiline F.; Kvarnliden, Hampus; Mikoviny, Tomas; Müller, Markus; Nielsen, Claus Jørgen; Stenstrøm, Yngve H.; Tan, Wen; Wisthaler, Armin; Zhu, Liang (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    The atmospheric chemistry of (CH3)3CNH2 (tert-butylamine, tBA) and (CH3)2(CH2OH)CNH2 (2-amino-2-methyl-1-propanol, AMP) has been studied by quantum chemistry methods and in photo-oxidation experiments in the EUPHORE chamber ...
  • Atmospheric Degradation of Amines (ADA) : summary report from atmospheric chemistry studies of amines, nitrosamines, nitramines and amides. 
    Nielsen, Claus Jørgen; D´Anna, Barbara; Bossi, Rossana; Bunkan, Arne Joakim Coldvin; Dithmer, Line; Glasius, Marianne; Hallquist, Mattias; Hansen, Anne Maria K.; Lutz, Anna; Salo, Kent; Maguta, Mihayo Musabila; Nguyen, Quynh; Mikoviny, Tomas; Müller, Markus; Skov, Henrik; Sarrasin, Emmanuel; Stenstrøm, Yngve; Tang, Yizhen; Westerlund, Jonathan; Wisthaler, Armin (Research report / Forskningsrapport, 2012)
    CLIMIT project no. 208122
  • Biogenic isoprene emissions driven by regional weather predictions using different initialization methods: Case studies during the SEAC4RS and DiSCOVER-AQ airborne campaigns 
    Huang, Min; Carmichael, Gregory R.; Crawford, James H.; Wisthaler, Armin; Zhan, Xiwu; Hain, Christopher R; Lee, Pius; Guenther, Alex B (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    Land and atmospheric initial conditions of the Weather Research and Forecasting (WRF) model are often interpolated from a different model output. We perform case studies during NASA's SEAC4RS and DISCOVER-AQ Houston airborne ...
  • Characterization of errors in satellite-based HCHO / NO2 tropospheric column ratios with respect to chemistry, column-to-PBL translation, spatial representation, and retrieval uncertainties 
    Souri, Amir H.; Johnson, Matthew S.; Wolfe, Glenn M.; Crawford, James H.; Fried, Alan; Wisthaler, Armin; Brune, William H.; Blake, Donald R.; Weinheimer, Andrew J.; Verhoelst, Tijl; Compernolle, Steven; Pinardi, Gaia; Vigouroux, Corinne; Langerock, Bavo; Choi, Sungyeon; Lamsal, Lok; Zhu, Lei; Sun, Shuai; Cohen, Ronald C.; Min, Kyung-Eun; Cho, Changmin; Philip, Sajeev; Liu, Xiong; Chance, Kelly (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    The availability of formaldehyde (HCHO) (a proxy for volatile organic compound reactivity) and nitrogen dioxide (NO2) (a proxy for nitrogen oxides) tropospheric columns from ultraviolet–visible (UV–Vis) satellites has ...
  • 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 
    Jo, Duseong S.; Emmons, Louisa K.; Callaghan, Patrick; Tilmes, Simone; Woo, Jung-Hun; Kim, Younha; Kim, Jinseok; Granier, Claire; Soulié, Antonin; Doumbia, Thierno; Darras, Sabine; Buchholz, Rebecca R.; Simpson, Isobel J.; Blake, Donald R.; Wisthaler, Armin; Schroeder, Jason R.; Fried, Alan; Kanaya, Yugo (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Abstract Model intercomparison studies often report a large spread in simulation results, but quantifying the causes of these differences is hindered by the fact that several processes contribute to the model spread ...
  • Comprehensive isoprene and terpene gas-phase chemistry improves simulated surface ozone in the southeastern US 
    Schwantes, Rebecca H.; Emmons, Louisa; Orlando, John J.; Barth, Mary C.; Tyndall, Geoffrey S.; Hall, Samuel R.; Ullmann, Kirk; St. Clair, Jason M.; Blake, Donald R.; Wisthaler, Armin; Paul V. Bui, Thao (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Abstract. Ozone is a greenhouse gas and air pollutant that is harmful to human health and plants. During the summer in the southeastern US, many regional and global models are biased high for surface ozone compared to ...