NDLI: Free Radicals and Fast Photochemistry during BERLIOZ

Content Provider	Springer Nature Link
Author	Platt, U. Alicke, B. Dubois, R. Geyer, A. Hofzumahaus, A. Holland, F. Martinez, M. Mihelcic, D. Klüpfel, T. Lohrmann, B. Pätz, W. Perner, D. Rohrer, F. Schäfer, J. Stutz, J.
Copyright Year	2002
Abstract	The free radicals OH, HO$_{2}$, RO$_{2}$, and NO$_{3}$ 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 NO$_{3}$ and O$_{3}$ could be quantified.
Starting Page	359
Ending Page	394
Page Count	36
File Format	PDF
ISSN	01677764
Journal	Journal of Atmospheric Chemistry
Volume Number	42
Issue Number	1
e-ISSN	15730662
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2002-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Meteorology/Climatology Atmospheric Protection/Air Quality Control/Air Pollution
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Atmospheric Science

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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