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In-situ Comparison of the NoY Instruments Flown in Mozaic and Spurt : Volume 6, Issue 1 (18/01/2006)

By Pätz, H.-w.

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Book Id: WPLBN0003988558
Format Type: PDF Article :
File Size: Pages 23
Reproduction Date: 2015

Title: In-situ Comparison of the NoY Instruments Flown in Mozaic and Spurt : Volume 6, Issue 1 (18/01/2006)  
Author: Pätz, H.-w.
Volume: Vol. 6, Issue 1
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Brunner, D., Schmidt, U., Hegglin, M. I., Fischer, H., Pätz, H., & Volz-Thomas, A. (2006). In-situ Comparison of the NoY Instruments Flown in Mozaic and Spurt : Volume 6, Issue 1 (18/01/2006). Retrieved from

Description: Institut für Chemie und Dynamik der Geosphäre II: Troposphäre, Forschungszentrum Jülich, Germany. 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 6%, 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.

In-situ comparison of the NOy instruments flown in MOZAIC and SPURT


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