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  Free radicals and fast photochemistry during BERLIOZ

Platt, U., Alicke, B., Dubois, R., Geyer, A., Hofzumahaus, A., Holland, F., et al. (2002). Free radicals and fast photochemistry during BERLIOZ. Journal of Atmospheric Chemistry, 42(1), 359-394.

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Genre: Journal Article
Alternative Title : J. Atmos. Chem.

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 Creators:
Platt, U., Author
Alicke, B., Author
Dubois, R., Author
Geyer, A., Author
Hofzumahaus, A., Author
Holland, F., Author
Martinez, M.1, Author           
Mihelcic, D., Author
Klüpfel, T.1, Author           
Lohrmann, B., Author
Pätz, W., Author
Perner, D.1, Author           
Rohrer, F., Author
Schäfer, J., Author
Stutz, J., Author
Affiliations:
1Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826285              

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Free keywords: free radicals; photochemistry; hydroxyl radical; nitrate radical; peroxy radical; spectroscopy; modelling
 Abstract: The free radicals OH, HO2, RO2, and NO3 are known to be the driving force for most chemical processes in the atmosphere. Since the low concentration of the above radicals makes measurements particularly difficult, only relatively few direct measurements of free radical concentrations have been reported to date. We present a comprehensive set of simultaneous radical measurements performed by Laser Induced Fluorescence (LIF), Matrix Isolation - Electron spin Resonance (MI-ESR), Peroxy Radical Chemical Amplification (PERCA), and Differential Optical Absorption Spectroscopy (DOAS) during the BERLIner OZonexperiment (BERLIOZ) during July and August of 1998 near Berlin, Germany. Most of the above radical species were measured by more than one technique and an intercomparison gave good agreement. This data set offered the possibility to study and quantify the role of each radical at a rural, semi-polluted site in the continental boundary layer and to investigate interconnections and dependencies among these free radicals. In general (box) modelled diurnal profiles of the different radicals reproduced the measurements quite well, however measured absolute levels are frequently lower than model predictions. These discrepancies point to disturbing deficiencies in our understanding of the chemical system in urban air masses. In addition considerable night-time peroxy radical production related to VOC reactions with NO3 and O-3 could be quantified.

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Language(s): eng - English
 Dates: 2002-05
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 15476
ISI: 000175947400016
 Degree: -

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Title: Journal of Atmospheric Chemistry
  Alternative Title : J. Atmos. Chem.
Source Genre: Journal
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Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 42 (1) Sequence Number: - Start / End Page: 359 - 394 Identifier: ISSN: 0167-7764