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Rarity of Upper-tropospheric Low O3 Mixing Ratio Events During Mozaic Flights : Volume 3, Issue 5 (29/09/2003)

By Asman, W. A. H.

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Book Id: WPLBN0003983420
Format Type: PDF Article :
File Size: Pages 9
Reproduction Date: 2015

Title: Rarity of Upper-tropospheric Low O3 Mixing Ratio Events During Mozaic Flights : Volume 3, Issue 5 (29/09/2003)  
Author: Asman, W. A. H.
Volume: Vol. 3, Issue 5
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2003
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

APA MLA Chicago

Nédélec, P., Crutzen, P. J., M. Brenninkmeije, C. A., Lawrence, M. G., H. Asma, W. A., & M. Cuijper, J. W. (2003). Rarity of Upper-tropospheric Low O3 Mixing Ratio Events During Mozaic Flights : Volume 3, Issue 5 (29/09/2003). Retrieved from http://ebooklibrary.org/


Description
Description: Max-Planck-Institute for Chemistry, Atmospheric Chemistry Division, P.O Box 3060, 55020 Mainz, Germany. 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.

Summary
Rarity of upper-tropospheric low O3 mixing ratio events during MOZAIC flights

 

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