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Titel Rarity of upper-tropospheric low O3 mixing ratio events during MOZAIC flights
VerfasserIn W. A. H. Asman, M. G. Lawrence, C. A. M. Brenninkmeijer, P. J. Crutzen Link zu Wikipedia, J. W. M. Cuijpers, P. Nédélec
Medientyp Artikel
Sprache Englisch
ISSN 1680-7316
Digitales Dokument URL
Erschienen In: Atmospheric Chemistry and Physics ; 3, no. 5 ; Nr. 3, no. 5 (2003-09-29), S.1541-1549
Datensatznummer 250001262
Publikation (Nr.) Volltext-Dokument vorhandencopernicus.org/acp-3-1541-2003.pdf
 
Zusammenfassung
Only a few previous observations of very low O3 mixing ratios in the upper troposphere are available. The aim of this study was to examine the rich MOZAIC data set for more. Flights with at least 25 4 s averaged mixing ratios less than 8 ppbv at pressures lower than 500 hPa measured using commercial aircraft within the MOZAIC project have been analysed. There are eleven flights that fulfil these conditions (excluding artefacts as discussed below), representing about 0.001% of all measurements during the analysed period August 1994-December 1997. The low O3 events occurred over Southeast Asia, Africa, Brazil and the sea area 200 km east of Florida (US) and were all likely to be associated with transport of air masses from tropical sea areas. These low mixing ratio events occur in the upper troposphere during periods with generally low mixing ratios. They are not only found over sea, but also over land at pressure levels as low as 179 hPa. It could well be that some of the low O3 mixing ratio events measured during two or more flights belong to the same bigger low O3 mixing ratio area.
 
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