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Conclusions

The identification and the quantification of vertical short-scale structures induced by gravity waves and the large-scale advection were carried out on high-resolution radiosonde data in the UT/LS at La Réunion Island.

The observations suggest horizontal and vertical transport of air masses across the subtropical barrier and the tropopause. Moreover, gravity waves seem to play an important role in mixing, more particularly in winter when advective structures are also dominant. The detection of vertical short-scale structures is here limited to heights of 21-25 km due to weak values of R(z).