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Original Research Papers

Cross-tropopause fluxes of ozone using assimilation of MOZAIC observations in a global CTM

Authors:

H. L. Clark ,

CNRM/GAME, Météo France and CNRS URA, FR
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M.-L. Cathala,

CNRM/GAME, Météo France and CNRS URA, FR
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H. Teyssédre,

CNRM/GAME, Météo France and CNRS URA, FR
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J.-P. Cammas,

Laboratoire d’Aerologie,Observertoire Midi-Pyrenees, FR
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V.-H. Peuch

CNRM/GAME, Météo France and CNRS URA, FR
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Abstract

Ozone measurements from Measurements of OZone and wAter vapour by aIrbus in-service airCraft (MOZAIC) have been assimilated into the global chemical transport model ofMétéo France known as Mod`ele de Chimie Atmosphérique `a Grande Echelle (MOCAGE). The assimilation makes improvements to the free model simulations of ozone in the upper troposphere and lower stratosphere, which are generally overestimated in the tropical region and underestimated in mid-latitudes. The tropical–subtropical gradient of ozone is also improved following assimilation and comparison with vertical profiles from ozonesondes suggests that the assimilation leads to a better representation of the vertical gradient around the tropopause.We use the assimilated fields to calculate a value for the flux of ozone across the tropopause. The net flux of ozone from stratosphere to troposphere is found to be 451 Tg yr-1 before assimilation and 383 Tg yr-1 after assimilation. The downward flux of ozone in the mid-latitudes exhibits an annual cycle with maximum flux occurring in early spring and minimum flux in autumn.

How to Cite: Clark, H.L., Cathala, M.-L., Teyssédre, H., Cammas, J.-P. and Peuch, V.-H., 2007. Cross-tropopause fluxes of ozone using assimilation of MOZAIC observations in a global CTM. Tellus B: Chemical and Physical Meteorology, 59(1), pp.39–49. DOI: http://doi.org/10.1111/j.1600-0889.2006.00227.x
  Published on 01 Jan 2007
 Accepted on 10 Oct 2006            Submitted on 3 Jan 2006

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