Influence of Arctic polar ozone depletion on lower stratospheric ozone amounts at Haute-Provence Observatory (43.92°N, 5.71°E)

摘要: Lidar and ozone sonde measurements performed at Haute-Provence Observatory are used together with a high-resolution potential vorticity (PV) transport model to study the influence of Arctic polar vortex depletion on amounts this location prior dilution. The focuses four winters from 1996 2000. is investigate presence air masses above station. These masses, which characterized by high PV values, can extend toward midlatitude regions during winter. Polar detected using daily threshold value defined fields. monthly average fraction generally increases altitude few percent in lower stratosphere 10% or more 500 K. source largely dominated filament events equally divided between filaments excursions station middle stratosphere. shows interannual variability. In winter 1999/2000 least amount was However, January March 2000 led significant reduction, estimated 1.6% 400-650 K temperature range chemical (CTM) evaluation loss edge. Cold vortex, such as observed 1999/2000, results less midlatitude, but strong within combined transient have impact regions.