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| Titel |
Peroxy radical partitioning during the AMMA radical intercomparison exercise |
| VerfasserIn |
M. D. Andrés-Hernández, D. Stone, D. M. Brookes, R. Commane, C. E. Reeves, H. Huntrieser, D. E. Heard, P. S. Monks, J. P. Burrows, H. Schlager, D. Kartal, M. J. Evans, C. F. A. Floquet, T. Ingham, J. Methven, A. E. Parker |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 10, no. 21 ; Nr. 10, no. 21 (2010-11-11), S.10621-10638 |
| Datensatznummer |
250008885
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| Publikation (Nr.) |
 copernicus.org/acp-10-10621-2010.pdf |
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| Zusammenfassung |
Peroxy radicals were measured onboard two scientific aircrafts during the
AMMA (African Monsoon Multidisciplinary Analysis) campaign in summer 2006.
This paper reports results from the flight on 16 August 2006 during which
measurements of HO2 by laser induced fluorescence spectroscopy at low
pressure (LIF-FAGE) and total peroxy radicals
(RO2* = HO2+ΣRO2, R = organic chain) by two
similar instruments based on the peroxy radical chemical amplification
(PeRCA) technique were subject of a blind intercomparison. The German
DLR-Falcon and the British FAAM-BAe-146 flew wing tip to wing tip for about
30 min making concurrent measurements on 2 horizontal level runs at 697 and
485 hPa over the same geographical area in Burkina Faso. A full set of
supporting measurements comprising photolysis frequencies, and relevant trace
gases like CO, NO, NO2, NOy, O3 and a wider range of VOCs
were collected simultaneously.
Results are discussed on the basis of the characteristics and limitations of
the different instruments used. Generally, no data bias are identified and
the RO2* data available agree quite reasonably within the
instrumental errors. The [RO2*]/[HO2] ratios, which vary
between 1:1 and 3:1, as well as the peroxy radical variability, concur
with variations in photolysis rates and in other potential radical
precursors. Model results provide additional information about dominant
radical formation and loss processes. |
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