Atmos. Chem. Phys., 9, 25-38, 2009
www.atmos-chem-phys.net/9/25/2009/
doi:10.5194/acp-9-25-2009
© Author(s) 2009. This work is distributed
under the Creative Commons Attribution 3.0 License.
Mixing processes and exchanges in the tropical and the subtropical UT/LS
R. James and B. Legras
Laboratoire de Météorologie Dynamique, Ecole Normale Supérieure – CNRS – Université Pierre et Curie, Paris, France

Abstract. Both in situ measurements and satellite observations indicate evidence of mixing in the upper troposphere (UT) and the lower-stratosphere (LS). In this study, the measurements performed during the Pre-AVE and Costa-Rica AVE campaigns are analysed with diffusive back-trajectories to assess mixing properties in the tropical and the subtropical UT/LS. A description of cross-tropopause pathways and mixing time scales is provided.

In the subtropics, Troposphere-Stratosphere mixing processes are found to differ in the vicinity of the tropopause and at higher altitudes. Below 350 K, a mixing line observed during Pre-AVE is shown to result from fast and local cross-tropopause irreversible exchange, involving two initially distant air masses with distinct chemical compositions. For measurements located above 350 K, mixing of the tropospheric air in the subtropical stratosphere occurs over a period of a month, the origins of the tropospheric source being localised in the tropical UT and the tropical boundary layer.

In the tropics, quantitative reconstructions of CO and O3 profiles above 360 K are obtained for one month back-trajectories calculations, pointing out that long term mixing is essential to determine the chemical composition in the tropical ascent. In particular, the existence of two-way meridional irreversible exchanges between 360 and 450 K is found to export tropical air in the subtropical stratosphere and to entrain old stratospheric air in the tropical ascent. Mean age of air calculated with a Lagrangian model is shown to be in agreement with the CO2 observations.


Citation: James, R. and Legras, B.: Mixing processes and exchanges in the tropical and the subtropical UT/LS, Atmos. Chem. Phys., 9, 25-38, doi:10.5194/acp-9-25-2009, 2009.
 
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