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The first near-global (−85° to 85°) measurements of the isotopic fractionation of 13CO relative to 12CO have been obtained from 5 to 90km using the ACE-FTS (Atmospheric Chemistry Experiment-Fourier Transform Spectrometer). These observations have been compared to predictions from WACCM (Whole Atmosphere Community Climate Model). The highest positive fractionation (i.e. relatively more 13CO) values...