NO and NOy in the upper troposphere: Nine years of CARIBIC measurements onboard a passenger aircraft

NO and NOy in the upper troposphere: Nine years of CARIBIC measurements onboard a passenger aircraft

Nitrogen oxide (NO and NOy) measurements were performed onboard an in-service aircraft within the framework of CARIBIC (Civil Aircraft for the Regular Investigation of the atmosphere Based on an Instrument Container). A total of 330 flights were completed from May 2005 through April 2013 between Fra...

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Bibliographic Details
Published in:Atmospheric environment (1994) Vol. 133; pp. 93 - 111
Main Authors: Stratmann, G., Ziereis, H., Stock, P., Brenninkmeijer, C.A.M., Zahn, A., Rauthe-Schöch, A., Velthoven, P.V., Schlager, H., Volz-Thomas, A.
Format: Journal Article
Language:English
Published: Elsevier Ltd 01-05-2016
Subjects:
Airborne
Atmosphere
Climatology
In-service aircraft
Nitrogen oxide
Upper troposphere
ANW, Canada
Colombia
USA
China, People's Rep
ISEW, Philippines
India
Venezuela
Korea, Rep
ASW, Brazil
South Africa
ISEW, Thailand
Chile
Germany
INW, Japan
Nitrogen oxide
Climatology
In-service aircraft
Upper troposphere
Atmosphere
Airborne
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Summary:Nitrogen oxide (NO and NOy) measurements were performed onboard an in-service aircraft within the framework of CARIBIC (Civil Aircraft for the Regular Investigation of the atmosphere Based on an Instrument Container). A total of 330 flights were completed from May 2005 through April 2013 between Frankfurt/Germany and destination airports in Canada, the USA, Brazil, Venezuela, Chile, Argentina, Colombia, South Africa, China, South Korea, Japan, India, Thailand, and the Philippines. Different regions show differing NO and NOy mixing ratios. In the mid-latitudes, observed NOy and NO generally shows clear seasonal cycles in the upper troposphere with a maximum in summer and a minimum in winter. Mean NOy mixing ratios vary between 1.36 nmol/mol in summer and 0.27 nmol/mol in winter. Mean NO mixing ratios range between 0.05 nmol/mol and 0.22 nmol/mol. Regions south of 40°N show no consistent seasonal dependence. Based on CO observations, low, median and high CO air masses were defined. According to this classification, more data was obtained in high CO air masses in the regions south of 40°N compared to the midlatitudes. This indicates that boundary layer emissions are more important in these regions. In general, NOy mixing ratios are highest when measured in high CO air masses. This dataset is one of the most comprehensive NO and NOy dataset available today for the upper troposphere and is therefore highly suitable for the validation of atmosphere-chemistry-models. •Most comprehensive nitrogen oxide dataset available today for the upper troposphere.•Longest NO and NOy series of measurements over Europe in the upper troposphere.•Clear seasonal cycles in NO and NOy mixing ratios are found in defined region.•NOy boundary layer emissions are more important in the (sub)tropical regions.
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content type line 23
ISSN:1352-2310
1873-2844
DOI:10.1016/j.atmosenv.2016.02.035