• Nitrogen Oxides Emissions, Chemistry, Deposition, and Export Over the Northeast United States During the WINTER Aircraft Campaign 

  Jaeglé, L.; Shah, V.; Thornton, J. A.; Lopez‐Hilfiker, F. D.; Lee, B. H.; McDuffie, E. E.; Fibiger, D.; Brown, S. S.; Veres, P.; Sparks, T. L.; Ebben, C. J.; Wooldridge, P. J.; Kenagy, H. S.; Cohen, R. C.; Weinheimer, A. J.; Campos, T. L.; Montzka, D. D.; DiGangi, J. P.; Wolfe, G. M.; Hanisco, T.; Schroder, J. C.; Campuzano‐Jost, P.; Day, D. A.; Jimenez, J. L.; Sullivan, A. P.; Guo, H.; Weber, R. J. (AGU Pubication, 2018-10-09)

  We examine the distribution and fate of nitrogen oxides (NOx) in the lower troposphere over the Northeast United States (NE US) using aircraft observations from the Wintertime INvestigation of Transport, Emissions, and ...

• Evidence for an unidentified non-photochemical ground-level source of formaldehyde in the Po Valley with potential implications for ozone production 

  Kaiser, J.; Wolfe, G. M.; Bohn, B.; Broch, S.; Fuchs, H.; Ganzeveld, L. N.; Gomm, S.; Häseler, R.; Hofzumahaus, A.; Holland, F.; Jäger, J.; Li, X.; Lohse, I.; Lu, K.; Prévôt, A. S. H.; Rohrer, F.; Wegener, R.; Wolf, R.; Mentel, T. F.; Kiendler-Scharr, A.; Wahner, A.; Keutsch, F. N. (Copernicus Publications, 2015-02-06)

  Ozone concentrations in the Po Valley of northern Italy often exceed international regulations. As both a source of radicals and an intermediate in the oxidation of most volatile organic compounds (VOCs), formaldehyde ...

• Wintertime Overnight NOx Removal in a Southeastern United States Coal‐fired Power Plant Plume: A Model for Understanding Winter NOx Processing and its Implications 

  Fibiger, Dorothy L.; McDuffie, Erin E.; Dubé, William P.; Aikin, Kenneth C.; Lopez‐Hilfiker, Felipe D.; Lee, Ben H.; Green, Jamie R.; Fiddler, Marc N.; Holloway, John S.; Ebben, Carlena; Sparks, Tamara L.; Wooldridge, Paul; Weinheimer, Andrew J.; Montzka, Denise D.; Apel, Eric C.; Hornbrook, Rebecca S.; Hills, Alan J.; Blake, Nicola J.; DiGangi, Josh P; Wolfe, Glenn M.; Bililign, Solomon; Cohen, Ronald C.; Thornton, Joel A.; Brown, Steven S. (AGU Pubication, 2018-01-05)

  Nitric oxide (NO) is emitted in large quantities from coal‐burning power plants. During the day, the plumes from these sources are efficiently mixed into the boundary layer, while at night, they may remain concentrated due ...

• Airborne measurements of the atmospheric emissions from a fuel ethanol refinery 

  Gouw, J. A. de; McKeen, S. A.; Aikin, K. C.; Brock, C. A.; Brown, S. S.; Gilman, J. B.; Graus, M.; Hanisco, T.; Holloway, J. S.; Kaiser, J.; Keutsch, F. N.; Lerner, B.M.; Liao, J.; Markovic, M. Z.; Middlebrook, A. M.; Min, K.-E.; Neuman, J. A.; Nowak, J. B.; Peischl, J.; Pollack, I. B.; Roberts, J. M.; Ryerson, T. B.; Trainer, M.; Veres, P. R.; Warneke, C.; Welti, A.; Wolfe, G. M. (AGU Pubication, 2015-04-08)

  Ethanol made from corn now constitutes approximately 10% of the fuel used in gasoline vehicles in the U.S. The ethanol is produced in over 200 fuel ethanol refineries across the nation. We report airborne measurements ...

• An observationally constrained evaluation of the oxidative capacity in the tropical western Pacific troposphere 

  Nicely, Julie M; Anderson, Daniel C.; Canty, Timothy P.; Salawitch, Ross J.; Wolfe, Glenn M.; Apel, Eric C.; Arnold, Steve R.; Atlas, Elliot L.; Blake, Nicola J.; Bresch, James F.; Campos, Teresa L.; Dickerson, Russell R.; Duncan, Bryan; Emmons, Louisa K.; Evans, Matthew J.; Fernandez, Rafael P.; Flemming, Johannes; Hall, Samuel R.; Hanisco, Thomas F.; Honomichl, Shawn B.; Hornbrook, Rebecca S.; Huijnen, Vincent; Kaser, Lisa; Kinnison, Douglas E.; Lamarque, Jean‐Francois; Mao, Jingqiu; Monks, Sarah A.; Montzka, Denise D.; Pan, Laura L.; Riemer, Daniel D.; Saiz‐Lopez, Alfonso; Steenrod, Stephen D.; H. Stell, Meghan; Tilmes, Simone; Turquety, Solene; Ullmann, Kirk; Weinheimer, Andrew J. (AGU Pubication, 2016-06-05)

  Hydroxyl radical (OH) is the main daytime oxidant in the troposphere and determines the atmospheric lifetimes of many compounds. We use aircraft measurements of O₃, H₂O, NO, and other species from the Convective Transport ...

• Impact of evolving isoprene mechanisms on simulated formaldehyde: An inter-comparison supported by in situ observations from SENEX 

  Marvin, Margaret R.; Wolfe, Glenn M.; Salawitch, Ross J.; Canty, Timothy P.; Roberts, Sandra J.; Travis, Katherine R.; Aikin, Kenneth C.; Gouw, Joost A. de; Graus, Martin; Hanisco, Thomas F.; Holloway, John S.; Hübler, Gerhard; Kaiser, Jennifer; Keutsch, Frank N.; Peischl, Jeff; Pollack, Ilana B.; Roberts, James M.; Ryerson, Thomas B.; Veres, Patrick R.; Warneke, Carsten (Elsevier, 2017-05-30)

  Isoprene oxidation schemes vary greatly among gas-phase chemical mechanisms, with potentially significant ramifications for air quality modeling and interpretation of satellite observations in biogenic-rich regions. In ...

• Observations of atmosphere-biosphere exchange of total and speciated peroxynitrates: nitrogen fluxes and biogenic sources of peroxynitrates 

  Min, K.-E.; Pusede, S. E.; Browne, E. C.; LaFranchi, B. W.; Wooldridge, P. J.; Wolfe, G. M.; Harrold, S. A.; Thornton, J. A.; Cohen, R. C. (Copernicus Publications, 2012-10-29)

  Peroxynitrates are responsible for global scale transport of reactive nitrogen. Recent laboratory observations suggest that they may also play an important role in delivery of nutrients to plant canopies. We measured eddy ...

• Decadal changes in summertime reactive oxidized nitrogen and surface ozone over the Southeast United States 

  Li, Jingyi; Mao, Jingqiu; Fiore, Arlene M.; Cohen, Ronald C.; Crounse, John D.; Teng, Alex P.; Wennberg, Paul O.; Lee, Ben H.; Lopez-Hilfiker, Felipe D.; Thornton, Joel A.; Peischl, Jeff; Pollack, Ilana B.; Ryerson, Thomas B.; Veres, Patrick; Roberts, James M.; Neuman, J. Andrew; Nowak, John B.; Wolfe, Glenn M.; Hanisco, Thomas F.; Fried, Alan; Singh, Hanwant B.; Dibb, Jack; Paulot, Fabien; Horowitz, Larry W. (Copernicus Publications, 2018-02-16)

  Widespread efforts to abate ozone (O₃) smog have significantly reduced emissions of nitrogen oxides (NOx) over the past 2 decades in the Southeast US, a place heavily influenced by both anthropogenic and biogenic emissions. ...

• Impact of isoprene and HONO chemistry on ozone and OVOC formation in a semirural South Korean forest 

  Kim, S.; Kim, S.-Y.; Lee, M.; Shim, H.; Wolfe, G. M.; Guenther, A. B.; He, A.; Hong, Y.; Han, J. (Copernicus Publications, 2015-04-29)

  Rapid urbanization and economic development in East Asia in past decades has led to photochemical air pollution problems such as excess photochemical ozone and aerosol formation. Asian megacities such as Seoul, Tokyo, ...

• Observational constraints on glyoxal production from isoprene oxidation and its contribution to organic aerosol over the Southeast United States 

  Li, Jingyi; Mao, Jingqiu; Min, Kyung‐Eun; Washenfelder, Rebecca A.; Brown, Steven S.; Kaiser, Jennifer; Keutsch, Frank N.; Volkamer, Rainer; Wolfe, Glenn M.; Hanisco, Thomas F.; Pollack, Ilana B.; Ryerson, Thomas B.; Graus, Martin; Gilman, Jessica B.; Lerner, Brian M.; Warneke, Carsten; Gouw, Joost A. de; Middlebrook, Ann M.; Liao, Jin; Welti, André; Henderson, Barron H.; McNeill, V. Faye; Hall, Samuel R.; Ullmann, Kirk; Donner, Leo J.; Paulot, Fabien; Horowitz, Larry W. (AGU Pubication, 2016-07-31)

  We use a 0‐D photochemical box model and a 3‐D global chemistry‐climate model, combined with observations from the NOAA Southeast Nexus (SENEX) aircraft campaign, to understand the sources and sinks of glyoxal over the ...

• High upward fluxes of formic acid from a boreal forest canopy 

  Schobesberger, Siegfried; Lopez‐Hilfiker, Felipe D.; Taipale, Ditte; Millet, Dylan B.; D'Ambro, Emma L.; Rantala, Pekka; Mammarella, Ivan; Zhou, Putian; Wolfe, Glenn M.; Lee, Ben H.; Boy, Michael; Thornton, Joel A. (AGU Pubication, 2016-08-26)

  Eddy covariance fluxes of formic acid, HCOOH, were measured over a boreal forest canopy in spring/summer 2014. The HCOOH fluxes were bidirectional but mostly upward during daytime, in contrast to studies elsewhere that ...

• Southeast Atmosphere Studies: learning from model-observation syntheses 

  Mao, Jingqiu; Carlton, Annmarie; Cohen, Ronald C.; Brune, William H.; Brown, Steven S.; Wolfe, Glenn M.; Jimenez, Jose L.; Pye, Havala O. T.; Ng, Nga Lee; Xu, Lu; McNeill, V. Faye; Tsigaridis, Kostas; McDonald, Brian C.; Warneke, Carsten; Guenther, Alex; Alvarado, Matthew J.; Gouw, Joost de; Mickley, Loretta J.; Leibensperger, Eric M.; Mathur, Rohit; Nolte, Christopher G.; Portmann, Robert W.; Unger, Nadine; Tosca, Mika; Horowitz, Larry W. (Copernicus Publications, 2018-02-22)

  Concentrations of atmospheric trace species in the United States have changed dramatically over the past several decades in response to pollution control strategies, shifts in domestic energy policy and economics, and ...

• A pervasive role for biomass burning in tropical high ozone/low water structures 

  Anderson, Daniel C.; Nicely, Julie M.; Salawitch, Ross J.; Canty, Timothy P.; Dickerson, Russell R.; Hanisco, Thomas F.; Wolfe, Glenn M.; Apel, Eric C.; Atlas, Elliot; Bannan, Thomas; Bauguitte, Stephane; Blake, Nicola J.; Bresch, James F.; Campos, Teresa L.; Carpenter, Lucy J.; Cohen, Mark D.; Evans, Matthew; Fernandez, Rafael P.; Kahn, Brian H.; Kinnison, Douglas E.; Hall, Samuel R.; Harris, Neil R.P.; Hornbrook, Rebecca S.; Lamarque, Jean-Francois; Breton, Michael Le; Lee, James D.; Percival, Carl; Pfister, Leonhard; Pierce, R. Bradley; Riemer, Daniel D.; Saiz-Lopez, Alfonso; Stunder, Barbara J.B.; Thompson, Anne M.; Ullmann, Kirk; Vaughan, Adam; Weinheimer, Andrew J. (Nature Research, 2016-01-13)

  Air parcels with mixing ratios of high O₃ and low H₂O (HOLW) are common features in the tropical western Pacific (TWP) mid-troposphere (300–700 hPa). Here, using data collected during aircraft sampling of the TWP in winter ...

• Interannual variability of long-range transport as seen at the Mt. Bachelor observatory 

  Reidmiller, D. R.; Jaffe, D. A.; Chand, D.; Strode, S.; Swartzendruber, P.; Wolfe, G. M.; Thornton, J. A. (Copernicus Publications, 2009-01-27)

  Interannual variations in background tropospheric trace gases (such as carbon monoxide, CO) are largely driven by variations in emissions (especially wildfires) and transport pathways. Understanding this variability is ...

• Missing peroxy radical sources within a summertime ponderosa pine forest 

  Wolfe, G. M.; Cantrell, C.; Kim, S.; Maudlin III, R. L.; Karl, T.; Harley, P.; Turnipseed, A.; Zheng, W.; Flocke, F.; Apel, E. C.; Hornbrook, R. S.; Hall, S. R.; Ullmann, K.; Henry, S. B.; DiGangi, J. P.; Boyle, E. S.; Kaser, L.; Schnitzhofer, R.; Hansel, A.; Graus, M.; Nakashima, Y.; Kajii, Y.; Guenther, A.; Keutsch, F. N. (Copernicus Publications, 2014-05-13)

  Organic peroxy (RO₂) and hydroperoxy (HO₂) radicals are key intermediates in the photochemical processes that generate ozone, secondary organic aerosol and reactive nitrogen reservoirs throughout the troposphere. In regions ...

• Reassessing the ratio of glyoxal to formaldehyde as an indicator of hydrocarbon precursor speciation 

  Kaiser, J.; Wolfe, G. M.; Min, K.E.; Brown, S. S.; Miller, C. C.; Jacob, D. J.; Gouw, J. A.; Graus, M.; Hanisco, T. F.; Holloway, J.; Peischl, J.; Pollack, I. B.; Ryerson, T. B.; Warneke, C.; Washenfelder, R. A.; Keutsch, F. N. (Copernicus Publications, 2015-07-13)

  The yield of formaldehyde (HCHO) and glyoxal (CHOCHO) from oxidation of volatile organic compounds (VOCs) depends on precursor VOC structure and the concentration of NOx (NOx = NO + NO2). Previous work has proposed that ...

• Glyoxal yield from isoprene oxidation and relation to formaldehyde: chemical mechanism, constraints from SENEX aircraft observations, and interpretation of OMI satellite data 

  Miller, Christopher Chan; Jacob, Daniel J.; Marais, Eloise A.; Yu, Karen; Travis, Katherine R.; Kim, Patrick S.; Fisher, Jenny A.; Zhu, Lei; Wolfe, Glenn M.; Hanisco, Thomas F.; Keutsch, Frank N.; Kaiser, Jennifer; Min, Kyung-Eun; Brown, Steven S.; Washenfelder, Rebecca A.; Abad, Gonzalo González; Chance, Kelly (Copernicus Publications, 2017-07-18)

  Glyoxal (CHOCHO) is produced in the atmosphere by the oxidation of volatile organic compounds (VOCs). Like formaldehyde (HCHO), another VOC oxidation product, it is measurable from space by solar backscatter. Isoprene ...

• The Convective Transport of Active Species in the Tropics (CONTRAST) Experiment 

  Wolfe, G.; et al. (American Meteorological Society (AMS), 2017-01-23)

  The Convective Transport of Active Species in the Tropics (CONTRAST) experiment was conducted from Guam (13.5°N, 144.8°E) during January–February 2014. Using the NSF/NCAR Gulfstream V research aircraft, the experiment ...

• Photochemical modeling of glyoxal at a rural site: observations and analysis from BEARPEX 2007 

  Huisman, A. J.; Hottle, J. R.; Galloway, M. M.; DiGangi, J. P.; Coens, K. L.; Choi, W.; Faloona, I. C.; Gilman, J. B.; Kuster, W. C.; Gouw, J. de; Bouvier-Brown, N. C.; Goldstein, A. H.; LaFranchi, B. W.; Cohen, R. C.; Wolfe, G. M.; Thornton, J. A.; Docherty, K. S.; Farmer, D. K.; Cubison, M. J.; Jimenez, J. L.; Mao, J.; Brune, W. H.; Keutsch, F. N. (Copernicus Publications, 2011-09-01)

  We present roughly one month of high time-resolution, direct, in situ measurements of gas-phase glyoxal acquired during the BEARPEX 2007 field campaign. The research site, located on a ponderosa pine plantation in the ...

• Influence of trans-Pacific pollution transport on acyl peroxy nitrate abundances and speciation at Mount Bachelor Observatory during INTEX-B 

  Wolfe, G.M.; Thornton, J. A.; McNeill, V. F.; Jaffe, D. A.; Reidmiller, D.; Chand, D.; Smith, J.; Swartzendruber, P.; Flocke, F.; Zheng, W. (Copernicus Publications, 2007-10-16)

  We present month-long observations of speciated acyl peroxy nitrates (APNs), including PAN, PPN, MPAN, APAN, and the sum of PiBN and PnBN, measured at the Mount Bachelor Observatory (MBO) as part of the INTEX-B collaborative ...

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