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| Titel |
In-situ comparison of the NOy instruments flown in MOZAIC and SPURT |
| VerfasserIn |
H.-W. Pätz, A. Volz-Thomas, M. I. Hegglin, D. Brunner, H. Fischer, U. Schmidt |
| 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 ; 6, no. 9 ; Nr. 6, no. 9 (2006-06-29), S.2401-2410 |
| Datensatznummer |
250003967
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| Publikation (Nr.) |
 copernicus.org/acp-6-2401-2006.pdf |
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| Zusammenfassung |
| Two aircraft instruments for the measurement of total odd nitrogen
(NOy) were compared side by side aboard a Learjet A35 in April 2003
during a campaign of the AFO2000 project SPURT (Spurengastransport in der
Tropopausenregion). The instruments albeit employing the same measurement
principle (gold converter and chemiluminescence) had different inlet
configurations. The ECO-Physics instrument operated by ETH-Zürich in
SPURT had the gold converter mounted outside the aircraft, whereas the
instrument operated by FZ-Jülich in the European project MOZAIC III
(Measurements of ozone, water vapour, carbon monoxide and nitrogen oxides
aboard Airbus A340 in-service aircraft) employed a Rosemount probe with 80 cm
of FEP-tubing connecting the inlet to the gold converter. The NOy
concentrations during the flight ranged between 0.3 and 3 ppb. The two data
sets were compared in a blind fashion and each team followed its normal
operating procedures. On average, the measurements agreed within 7%,
i.e. within the combined uncertainty of the two instruments. This puts an
upper limit on potential losses of HNO3 in the Rosemount inlet of the
MOZAIC instrument. Larger transient deviations were observed during periods
after calibrations and when the aircraft entered the stratosphere. The time
lag of the MOZAIC instrument observed in these instances is in accordance
with the time constant of the MOZAIC inlet line determined in the laboratory
for HNO3. |
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