Tracer analysis of transport from the boundary layer to the free troposphere

A mesoscale meteorological model with passive tracers is applied in order t o analyze transport from the atmospheric boundary layer to the free troposp here. The validation of the model against aircraft measurements indicates t hat the model adequately simulates the tracer distributions in the free tro posphere as well as in the boundary layer. Budget calculations of passive t racers are performed in order to estimate the amount of transport in the ar ea of a frontal system. The results show a very effective uplift associated in particular with a WCB transporting up to similar to 70% of a passive tr acer initialized in the boundary layer to the free troposphere within 3 day s.