O3-N2O correlations from the Atmospheric Chemistry Experiment: Revisiting a diagnostic of transport and chemistry in the stratosphere

摘要: [1] Our knowledge of stratospheric O3-N2O correlations is extended, and their potential for model-measurement comparison assessed, using data from the Atmospheric Chemistry Experiment (ACE) satellite Canadian Middle Atmosphere Model (CMAM). ACE provides first comprehensive set investigation interhemispheric, interseasonal, height-resolved differences correlation structure. By subsampling CMAM data, representativeness evaluated. In middle stratosphere, where are not compact therefore mainly reflect sampling, joint probability density functions provide a detailed picture key aspects transport mixing, but also trace polar ozone loss. captures these important features, exhibits displacement tropical pipe into Southern Hemisphere (SH). Below about 21 km, generally confirm compactness correlations, although chemical loss tends to destroy during late winter/spring, especially in SH. This allows quantitative slopes lower lowermost stratosphere (LMS), which exhibit distinct seasonal cycles that reveal different balances between diabatic descent horizontal mixing two regions Northern (NH), reconciling found aircraft measurements, strong role The qualitatively well reproduced by CMAM, amplitude too weak NH LMS. allow “chemical” definition LMS, vary substantially vertical extent with season.