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| Titel |
Measurements of total odd nitrogen (NOy) aboard MOZAIC in-service aircraft: instrument design, operation and performance |
| VerfasserIn |
A. Volz-Thomas, M. Berg, T. Heil, N. Houben, A. Lerner, W. Petrick, D. Raak, H.-W. Pätz |
| 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 ; 5, no. 3 ; Nr. 5, no. 3 (2005-02-25), S.583-595 |
| Datensatznummer |
250002494
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| Publikation (Nr.) |
 copernicus.org/acp-5-583-2005.pdf |
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| Zusammenfassung |
| A small system for the unattended measurement of total odd
nitrogen (NOy, i.e., the sum of NO and its atmospheric
oxidation products) aboard civil in-service aircraft in the
framework of MOZAIC is described. The instrument employs the
detection of NO by its chemiluminescence with O3 in
combination with catalytic conversion of the other NOy
compounds to NO at 300°C on a gold surface in the presence
of H2. The instrument has a sensitivity of 0.4-0.7cps/ppt
and is designed for unattended operation during 1-2 service
cycles of the aircraft (400-800 flight hours). The total weight
is 50kg, including calibration system, compressed gases,
mounting, and safety measures. The layout and inlet configuration
are governed by requirements due to the certification for
passenger aircraft. Laboratory tests are described regarding the
conversion efficiency for NO2 and HNO3 (both
>98%). Interference by non-NOy species is
<1% for CH3CN and NH3, <5x10-5% for
N2O (corresponding to <0.2ppt fake NOy from
ambient N2O) and 100% for HCN. The time response of the
instrument is <1s (90% change) for NO2. The response
for HNO3 is nonlinear: 20s for 67%, 60s for 80%,
and 150s for 90% response, respectively. |
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