Ozone isotopologue measurements from the Atmospheric Chemistry Experiment (ACE)

Abstract Near global ozone isotopologue distributions have been determined from infrared solar occultation measurements of the Atmospheric Chemistry Experiment (ACE) satellite mission. ACE measurements are made with a high resolution Fourier transform spectrometer. Annual and seasonal latitudinal fractionation ( δ value) distributions of the ozone isotopologues 16 O 16 O 18 O, 16 O 18 O 16 O and 16 O 17 O 16 O were obtained. Asymmetric ozone ( 16 O 16 O 18 O) shows higher fractionation compared to symmetric ozone ( 16 O 18 O 16 O). The maximum ozone fractionation occurs in the tropical stratosphere as expected from the contribution of photolysis to the enrichment of heavy isotopologues. An enhancement of the heavy ozone isotopologues is also seen in the upper stratosphere of the Antarctic polar vortex.