Quantification of the transport of chemical constituents from the polar vortex to midlatitudes in the lower stratosphere using the high-resolution advection model MIMOSA and effective diffusivity

摘要: The observed decrease of ozone in the northern midlatitude lower stratosphere is only partially reproduced by chemical models. transport ozone‐depleted air from polar vortex one proposed mechanisms to explain discrepancy. Here we present a study on quantification mass transported during four winters 1996–1997 1999–2000, relation with filamentation and break up, using high‐resolution advection model MIMOSA isentropic surfaces. Sensitivity tests show that able predict location filaments accuracy better than 100 km, limited uncertainties meteorological advecting wind fields. effective diffusivity diagnostic used evaluate intensity edge barrier quantify midlatitude. increasing height 400 550 K nearly constant above. During periods cold undisturbed vortex, favorable chlorine activation, very weak. This suggests midwinter plays minor role decline. In opposite limit, stratospheric warming up 30% midlatitudes. cumulative early January end April across varies almost 5% at 675 1997 50% 435 1999.