Numerische Modellierung des Lebenszyklus von Kondensstreifen und Cirrusbewoelkung

A three-dimensional mesoscale atmospheric model is presented which allows a detailed study of the cloud-microphysical processes during the formation of contrails. The model is able to correctly predict the life cycle of contrails. The model results are compared to data measured during the international cirrus experiment ICE 1989. A sensitivity study analyses the effect of the parameterisation of ice nucleation implemented in the model on th development of cirrus clouds and contrails. Although there are differences in the model results it is shown that all investigated parameterisations are able to predict the development of ice clouds at temperatures below -30 C. A second sensitivity study is performed investigating the dependency of the life time of contrails on the relative humidity of the ambient atmosphere. The regression function found shows an exponential dependency of the life time of the contrail on the humidity of the environment. (orig.)108 refs.SIGLEAvailable from TIB Hannover: RA 3251(96/E/38) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman