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Mixing processes in a tropopause folding observed by a network of ST radar and lidar

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Figure

Fig. 1. ECMWF analysis on Saturday, 4 March 1995. Potential vorticity on the 300 hPa isobaric surface at 0600 UT (left), 1200 UT (center) and 1800 UT (right).
Fig. 2. ECMWF Analysis. Wind field on the 300 hPa isobaric surface, on 4 March 1995 at 0600 (left); 1200 (center) and 1800 UTC (right).
Fig. 5. Time-height cross section of: (a) the atmospheric stability N 2 (s −2 ) deduced from the temperature field measured by the OHP Raman lidar, and (b) the signal-to-noise ratio (in dB) measured along the vertical by the OHP VHF radar
Fig. 6. Time-height cross section of (a) the Toulon VHF radar as- as-pect ratio (AR) and (b) the ECMWF model static stability on 4 and 5 March 1995
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