Abstract
A 1-D model of the formation and seasonal evolution of Polar Stratospheric Clouds (PSCs) is described. The model considers PSCs of types 1 and 2 in the vertical range from 8 to 30 km and utilizes real temperature data. The micro-physical processes included in the model are the heterogeneous nucleation and condensation (or evaporation), while sedimentation, gas diffusion and vertical wind velocity are the processes responsible for transport. Model simulations have been compared with PSC data obtained by lidar at the South Pole: results for the winter 1990 are discussed. The different contribution of type 1 and type 2 PSCs to the measured backscattering coefficient has been evidenced. In the simulations, layers of NAT particles form when low values of the backscattering coefficient are measured; similarly, ice particles form when sharper and rapidly changeable structures with higher values of the backscattering coefficient are observed. Significant results on the condensation and depletion of HNO3 and H2O are presented. Water vapor profiles measured during winter 1990 are reproduced quite well.
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Panegrossi, G., Fuà, D. & Fiocco, G. A 1-D model of the formation and evolution of Polar Stratospheric Clouds. J Atmos Chem 23, 5–35 (1996). https://doi.org/10.1007/BF00058702
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DOI: https://doi.org/10.1007/BF00058702