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54111 
Journal Article 
Simulation of ozone intrusion caused by a tropopause fold and cut-off low 
Ebel, A; Hass, H; Jakobs, JH; Laube, M; Memmesheimer, M; Oberreuter, A 
1991 
1 
Atmospheric Environment
ISSN: 1352-2310
EISSN: 1873-2844 
25 
10 
2131-2144 
WOS:A1991GB56600006 
A tropopause fold and cut-off low developed over Europe at the end of April 1982 and enhance the exchange of air between the stratosphere and troposphere. The episode has been simulated using the EURAD model which has been designed for long-range transport simulation for European conditions. Applying a linear relationship between potential vorticity and ozone, concentration fields of the tracer and their changes due to outflow of ozone-rich air from the stratosphere could be simulated. A considerable decrease of stratospheric ozone was also obtained. This indicates noticeable mixing of tropospheric air with reduced ozone content into the stratosphere during the episode. Strong downward fluxes more than an order of magnitude larger than normal when averaged over the model domain show up around levels close to the tropopause. Obviously, dynamical processes govern the ozone budget of the upper troposphere during the vigorous intrusion event. Drastic increases of ozone also occur in the lower troposphere but are probably underestimated since vertical mixing by clouds is not taken into account in the simulation experiments. It is intended to explore the interaction of ozone of stratospheric and tropospheric(anthropogenic) origin in further experiments. 
OZONE; TRANSPORT; TROPOSPHERE STRATOSPHERE EXCHANGE; TROPOPAUSE FOLDING; CUTOFF LOWS; MODELING