Airborne measurement of OH reactivity during INTEX-B
Jingqiu Mao,Jingqiu Mao,Xinrong Ren,Xinrong Ren,William H. Brune,Jennifer R. Olson,James H. Crawford,Alan Fried,L. G. Huey,Ronald C. Cohen,Brian G. Heikes,Hanwant B. Singh,Donald R. Blake,G. W. Sachse,Glenn S. Diskin,Samuel R. Hall,Richard E. Shetter +16 more
TLDR
In the second phase of the International Chemical Transport Experiment-B (INTEX-B) campaign as discussed by the authors, a new airborne OH reactivity instrument was designed and deployed for the first time on the NASA DC-8 aircraft, which was focused on the Asian pollution outflow over Pacific Ocean and was based in Hawaii and Alaska.Abstract:
. The measurement of OH reactivity, the inverse of the OH lifetime, provides a powerful tool to investigate atmospheric photochemistry. A new airborne OH reactivity instrument was designed and deployed for the first time on the NASA DC-8 aircraft during the second phase of Intercontinental Chemical Transport Experiment-B (INTEX-B) campaign, which was focused on the Asian pollution outflow over Pacific Ocean and was based in Hawaii and Alaska. The OH reactivity was measured by adding OH, generated by photolyzing water vapor with 185 nm UV light in a moveable wand, to the flow of ambient air in a flow tube and measuring the OH signal with laser induced fluorescence. As the wand was pulled back away from the OH detector, the OH signal decay was recorded; the slope of −Δln(signal)/Δ time was the OH reactivity. The overall absolute uncertainty at the 2σ confidence levels is about 1 s−1 at low altitudes (for decay about 6 s−1), and 0.7 s−1 at high altitudes (for decay about 2 s−1). From the median vertical profile obtained in the second phase of INTEX-B, the measured OH reactivity (4.0±1.0 s−1) is higher than the OH reactivity calculated from assuming that OH was in steady state (3.3±0.8 s−1), and even higher than the OH reactivity that was calculated from the total measurements of all OH reactants (1.6±0.4 s−1). Model calculations show that the missing OH reactivity is consistent with the over-predicted OH and under-predicted HCHO in the boundary layer and lower troposphere. The over-predicted OH and under-predicted HCHO suggest that the missing OH sinks are most likely related to some highly reactive VOCs that have HCHO as an oxidation product.read more
Citations
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Atmospheric composition change – global and regional air quality
Paul S. Monks,Claire Granier,Claire Granier,Claire Granier,Sandro Fuzzi,Andreas Stohl,Martin L. Williams,Hajime Akimoto,Markus Amann,Alexander Baklanov,Urs Baltensperger,Isabelle Bey,Nicola J. Blake,Robert S. Blake,Kenneth S. Carslaw,Owen R. Cooper,Owen R. Cooper,F. J. Dentener,David Fowler,E. Fragkou,Gregory J. Frost,Gregory J. Frost,S. Generoso,Paul Ginoux,Volker Grewe,Alex Guenther,Hans-Christen Hansson,Stephan Henne,Jens Hjorth,Andreas Hofzumahaus,Heidi Huntrieser,Ivar S. A. Isaksen,Michael E. Jenkin,Jan Kaiser,Maria Kanakidou,Zbigniew Klimont,Markku Kulmala,Paolo Laj,Paolo Laj,Mark Lawrence,James D. Lee,Catherine Liousse,Michela Maione,Gordon McFiggans,A. Metzger,Aude Mieville,Nicolas Moussiopoulos,John J. Orlando,Colin D. O'Dowd,Paul I. Palmer,D. D. Parrish,Andreas Petzold,Ulrich Platt,Ulrich Pöschl,André S. H. Prévôt,Claire E. Reeves,Stefan Reimann,Yinon Rudich,Karine Sellegri,Rainer Steinbrecher,David Simpson,David Simpson,H.M. ten Brink,J. Theloke,G. R. van der Werf,Robert Vautard,Vigdis Vestreng,Ch. Vlachokostas,R. von Glasow +68 more
TL;DR: A review of the state of scientific understanding in relation to global and regional air quality is outlined in this article, in terms of emissions, processing and transport of trace gases and aerosols.
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Tropospheric OH and HO2 radicals: field measurements and model comparisons.
TL;DR: This critical review discusses field measurements of local concentrations of OH and HO(2) radicals in the troposphere, and in particular the comparisons that have been made with numerical model calculations containing a detailed chemical mechanism.
An Overview of MILAGRO 2006 Campaign: Mexico City Emissions and their Transport and Transformation
TL;DR: The Mexico City Metropolitan Area (MCMA) was selected as the case study to characterize the sources, concentrations, transport, and transformation processes of the gases and fine particles emitted to the MCMA atmosphere and to evaluate the regional and global impacts of these emissions.
Journal ArticleDOI
An overview of the MILAGRO 2006 Campaign: Mexico City emissions and their transport and transformation
Luisa T. Molina,Sasha Madronich,Jeffrey S. Gaffney,Eric C. Apel,B. de Foy,Jerome D. Fast,Richard Ferrare,Scott C. Herndon,Jose L. Jimenez,Brian Lamb,Alvaro Osornio-Vargas,Philip B. Russell,James J. Schauer,Philip S. Stevens,Rainer Volkamer,M. Zavala +15 more
TL;DR: The Mexico City Metropolitan Area (MCMA) was selected as the case study to characterize the sources, concentrations, transport, and transformation processes of the gases and fine particles emitted to the MCMA atmosphere and to evaluate the regional and global impacts of these emissions as mentioned in this paper.
Journal ArticleDOI
Laboratory studies of the chemical composition and cloud condensation nuclei (CCN) activity of secondary organic aerosol (SOA) and oxidized primary organic aerosol (OPOA)
Andrew T. Lambe,Timothy B. Onasch,Paola Massoli,D. R. Croasdale,Justin P. Wright,Adam T. Ahern,Leah R. Williams,D. R. Worsnop,William H. Brune,Paul Davidovits +9 more
TL;DR: In this paper, secondary organic aerosol (SOA) and oxidized OPOA were generated via controlled exposure of precursors to OH radicals and/or O 3 in a potential aerosol mass (PAM) flow reactor over timescales equivalent to 1-20 days of atmospheric aging.
References
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Chemical Kinetics and Photochemical Data for Use in Atmospheric Studies: Evaluation Number 18
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