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On the ability of chemical transport models to simulate the vertical structure of the N<sub>2</sub>O, NO<sub>2</sub> and HNO<sub>3</sub> species in the mid-latitude stratosphere

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Fig. 1. In situ volume mixing ratios (VMRs) of N 2 O measured by the SPIRALE instrument on 2 October 2002 at mid-latitudes (black line) and compared to the VMRs simulated by the Reprobus 3-D CTM at the time of SPIRALE observations (08:00 UT) and obtained a
Fig. 2. Potential Vorticity (PV) isocontours calculated by the MIMOSA high-resolution advection model at 06:00 UT on 2 October 2002 at: (a) 550 K (about 22.5 km); and (b) 810 K (about 30 km)
Fig. 3. Comparison between measured vertical profiles of NO 2 (a) and HNO 3 (b) on 2 Oc- Oc-tober 2002 at mid-latitudes (black lines) and profiles simulated by the Reprobus 3-D CTM at 08:00 UT and a solar zenith angle of about 70 ◦ (red lines)
Fig. 4. Vertical profiles of reconstructed NO y * compared to the Reprobus model output on 2 October 2002 (red line)
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