Browsing Kjemisk institutt by Author "Fried, Alan"

Now showing items 1-16 of 16

  • 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 ...
  • 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 ...
  • Evaluation of simulated O3 production efficiency during the KORUS-AQ campaign: Implications for anthropogenic NOx emissions in Korea 
    Oak, Yujin J.; Park, Rokjin J; Schroeder, Jason R.; Crawford, James H.; Blake, Donald R.; Weinheimer, Andrew J.; Woo, Jung-Hun; Kim, Sang-Woo; Yeo, Huidong; Fried, Alan; Wisthaler, Armin; Brune, William H. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    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 ...
  • Field observational constraints on the controllers in glyoxal (CHOCHO) reactive uptake to aerosol 
    Kim, Dongwook; Cho, Changmin; Jeong, Seokhan; Lee, Soojin; Nault, Benjamin A.; Campuzano-Jost, Pedro; Day, Douglas A.; Schroder, Jason C.; Jimenez, Jose L.; Volkamer, Rainer; Blake, Donald R.; Wisthaler, Armin; Fried, Alan; Digangi, Joshua P.; Diskin, Glenn S.; Pusede, Sally E.; Hall, Samuel R.; Ullmann, Kirk; Huey, L. Gregory; Tanner, David J.; Dibb, Jack; Knote, Christoph J.; Min, Kyung-Eun (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Glyoxal (CHOCHO), the simplest dicarbonyl in the troposphere, is a potential precursor for secondary organic aerosol (SOA) and brown carbon (BrC) affecting air quality and climate. The airborne measurement of CHOCHO ...
  • Higher measured than modeled ozone production at increased NOx levels in the Colorado Front Range 
    Baier, Bianca C; Brune, William H; Miller, David O; Blake, Donald; Long, Russell; Wisthaler, Armin; Cantrell, Christopher; Fried, Alan; Heikes, Brian; Brown, Steven; McDuffie, Erin; Flocke, Frank; Apel, Eric; Kaser, Lisa; Weinheimer, Andrew (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    Chemical models must correctly calculate the ozone formation rate, P(O3), to accurately predict ozone levels and to test mitigation strategies. However, air quality models can have large uncertainties in P(O3) calculations, ...
  • Modeling NH4NO3 Over the San Joaquin Valley During the 2013 DISCOVER‐AQ Campaign 
    Kelly, James T.; Parworth, Caroline L.; Zhang, Qi; Miller, David J.; Sun, Kang; Zondlo, Mark A.; Baker, Kirk R.; Wisthaler, Armin; Nowak, John B.; Pusede, Sally E.; Cohen, Ronald C.; Weinheimer, Andrew J.; Beyersdorf, Andreas J.; Tonnesen, Gail S; Bash, Jesse O.; Valin, Luke C.; Crawford, James H.; Fried, Alan; Walega, James G. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    The San Joaquin Valley (SJV) of California experiences high concentrations of particulate matterNH4NO3during episodes of meteorological stagnation in winter. A rich data set of observations related toNH4NO3formation was ...
  • New insights into the column CH2O/NO2 ratio as an indicator of near-surface ozone sensitivity 
    Schroeder, Jason R.; Crawford, James H.; Fried, Alan; Walega, James; Weinheimer, Andrew; Wisthaler, Armin; Muller, Markus; Mikoviny, Tomas; Chen, Gao; Shook, Michael; Blake, Donald R; Tonnesen, Gail S (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    Satellite-based measurements of the column CH2O/NO2 ratio have previously been used to estimate near-surface ozone (O3) sensitivity (i.e., NOx or VOC limited), and the forthcoming launch of air quality-focused geostationary ...
  • 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 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 ...
  • 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 ...
  • 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 ...