Fig. 30.

Altitude distribution of ice supersaturated layers over Lindenberg, Germany, taken from corrected radiosonde humidity measurements (cf. Spichtinger et al., 2003) (A). A change in flight levels of at least ± 2 km would be needed to avoid half of the ice supersaturation. Probability of being in an ice supersaturated layer after an altitude change from the centre level of the ice-supersaturated region (B). A flight level change of ±300 m suffices to avoid ice-supersaturation on a case by case basis (analysis K. Gierens and U. Schumann).