Journal ArticleDOI
Direct Kinetic Measurements of Criegee Intermediate (CH2OO) Formed by Reaction of CH2I with O2
Oliver Welz,John D. Savee,David L. Osborn,Subith Vasu,Carl J. Percival,Dudley E. Shallcross,Craig A. Taatjes +6 more
TLDR
Direct photoionization mass spectrometric detection of formaldehyde oxide (CH2OO) as a product of the reaction ofCH2I with O2 enabled direct laboratory determinations of CH2OO kinetics, suggesting a substantially greater role of carbonyl oxides in models of tropospheric sulfate and nitrate chemistry than previously assumed.Abstract:
Ozonolysis is a major tropospheric removal mechanism for unsaturated hydrocarbons and proceeds via "Criegee intermediates"--carbonyl oxides--that play a key role in tropospheric oxidation models. However, until recently no gas-phase Criegee intermediate had been observed, and indirect determinations of their reaction kinetics gave derived rate coefficients spanning orders of magnitude. Here, we report direct photoionization mass spectrometric detection of formaldehyde oxide (CH(2)OO) as a product of the reaction of CH(2)I with O(2). This reaction enabled direct laboratory determinations of CH(2)OO kinetics. Upper limits were extracted for reaction rate coefficients with NO and H(2)O. The CH(2)OO reactions with SO(2) and NO(2) proved unexpectedly rapid and imply a substantially greater role of carbonyl oxides in models of tropospheric sulfate and nitrate chemistry than previously assumed.read more
Citations
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Formation of Urban Fine Particulate Matter
Renyi Zhang,Gehui Wang,Song Guo,Misti L. Zamora,Qi Ying,Yun Lin,Weigang Wang,Min Hu,Yuan Wang +8 more
TL;DR: Air pollutants consist of a complex combination of gases and particulate matter, which is emitted directly into the atmosphere or formed in the atmosphere through gas-to-particle conversion (secondary) (Figure 1).
Journal ArticleDOI
Tropospheric ozone and its precursors from the urban to the global scale from air quality to short-lived climate forcer
Paul S. Monks,Alexander T. Archibald,Augustin Colette,Owen R. Cooper,Mhairi Coyle,Richard G. Derwent,David Fowler,Claire Granier,Claire Granier,Claire Granier,Kathy S. Law,Gina Mills,David Stevenson,Oksana Tarasova,Valérie Thouret,E. von Schneidemesser,Roberto Sommariva,Oliver Wild,Martin L. Williams +18 more
TL;DR: In this paper, a review examines current understanding of the processes regulating tropospheric ozone at global to local scales from both measurements and models and takes the view that knowledge across the scales is important for dealing with air quality and climate change in a synergistic manner.
Journal ArticleDOI
Kinetics, products, and mechanisms of secondary organic aerosol formation
Paul J. Ziemann,Roger Atkinson +1 more
TL;DR: The intention of this review is to provide atmospheric chemists with sufficient information to understand the dominant pathways by which the major classes of atmospheric VOCs react to form SOA products, and the further reactions of these products in particles.
Journal ArticleDOI
Multiphase chemistry at the atmosphere-biosphere interface influencing climate and public health in the anthropocene.
Ulrich Pöschl,Manabu Shiraiwa +1 more
TL;DR: This work addresses air contaminants and their multiphase chemical interactions at the atmosphere−biosphere interface, including human lungs and skin, plant leaves, cryptogamic covers, soil, and aquatic surfaces, and the chemical interactions of reactive oxygen species and reactive nitrogen species, as well as carbonaceous combustion aerosols.
Journal ArticleDOI
Oxidation products of biogenic emissions contribute to nucleation of atmospheric particles.
Francesco Riccobono,Siegfried Schobesberger,Catherine E. Scott,Josef Dommen,Ismael K. Ortega,Linda Rondo,Joao Almeida,António Amorim,F. Bianchi,Martin Breitenlechner,A. David,Andrew J. Downard,Eimear M. Dunne,Jonathan Duplissy,Jonathan Duplissy,Sebastian Ehrhart,Richard C. Flagan,Alessandro Franchin,Armin Hansel,Heikki Junninen,Maija Kajos,Helmi Keskinen,Agnieszka Kupc,Andreas Kürten,Alexander N. Kvashin,Ari Laaksonen,Katrianne Lehtipalo,Vladimir Makhmutov,Serge Mathot,Tuomo Nieminen,Tuomo Nieminen,Antti Onnela,Tuukka Petäjä,Arnaud P. Praplan,Filipe Duarte Santos,Simon Schallhart,John H. Seinfeld,Mikko Sipilä,Mikko Sipilä,Dominick V. Spracklen,Yuri Stozhkov,Frank Stratmann,António Tomé,Georgios Tsagkogeorgas,Petri Vaattovaara,Yrjö Viisanen,Aron Vrtala,Paul E. Wagner,Ernest Weingartner,Heike Wex,Daniela Wimmer,Kenneth S. Carslaw,Joachim Curtius,Neil M. Donahue,Jasper Kirkby,Jasper Kirkby,Markku Kulmala,Markku Kulmala,Douglas R. Worsnop,Urs Baltensperger +59 more
TL;DR: It is shown, in experiments performed with the CLOUD (Cosmics Leaving Outdoor Droplets) chamber at CERN, that sulfuric acid and oxidized organic vapors at atmospheric concentrations reproduce particle nucleation rates observed in the lower atmosphere.
References
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Chemical kinetics and photochemical data for use in stratospheric modeling
W. B. Demore,Stanley P. Sander,D. M. Golden,R. F. Hampson,Michael J. Kurylo,Carleton J. Howard,A. R. Ravishankara,C. E. Kolb,Mario J. Molina +8 more
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Journal ArticleDOI
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Roger Atkinson,Donald L. Baulch,R. A. Cox,John Crowley,R. F. Hampson,R. G. Hynes,Michael E. Jenkin,Michel J. Rossi,J. Troe +8 more
TL;DR: In this article, the IUPAC Subcommittee on GasKinetic Data Evaluation for Atmospheric Chemistry presented the first in the series, presenting kinetic and photochemical data evaluated by the committee.
Journal ArticleDOI
Chemistry of secondary organic aerosol: Formation and evolution of low-volatility organics in the atmosphere
Jesse H. Kroll,John H. Seinfeld +1 more
TL;DR: A review of the chemistry of the formation and continuing transformation of low-volatility species in the atmosphere can be found in this article, where the primary focus is chemical processes that can change the volatility of organic compounds: oxidation reactions in the gas phase, reaction in the particle phase, and reaction in either phase over several generations.
Journal ArticleDOI
Known and unexplored organic constituents in the Earth's atmosphere
TL;DR: The sources, structure, chemistry, and fate of gas-phase and aerosol organic compounds were studied in this article. But much remains to be learned about the sources, structures, and chemistry of these compounds.