Reconstruction of the constituent distribution and trends in the Antarctic polar vortex from ER-2 flight observations

摘要: During the Airborne Antarctic Ozone Experiment, high-altitude ER-2 aircraft measured ozone, chlorine monoxide, and nitrous oxide concentrations in south polar region. These measurements have been analyzed using conservative coordinate transformations to potential temperature-N2O temperature-potential vorticity space. The latter transformation is equivalent interpreting trace species observations within modified Lagrangian mean (MLM) system. With certain assumptions about zonal symmetry, this allows for interpretation of chemical changes constituents independent meteorological variability. method also a reasonable reconstruction constituent distributions outside flight track. Our analysis shows that MLM transformed ozone concentration decreases at 0.06 ppmv (parts per million by volume) day between 20 16 km altitude inside vortex during mid-August mid-September period. must be origin; they are collocated with region high ClO. Outside CPR (chemically perturbed region) highest altitudes, systematically increases, suggesting diabatic cooling order 0.3–0.6 K/d. Within rate appears less than 0.2 technique creates picture general structure Austral which air deep chemically has subsided substantially relation outside. However, there tongue extends from mid-latitudes downward along stratospheric jet 65°W 6O°S. An examination last three days, September 20–22, 1987, period shifts equatorward Peninsula. Apparent over result sampling progressively further into vortex.