CO2 Isotopologues From the ACE Satellite

Carbon dioxide isotopologues have been studied thoroughly in the troposphere. In the stratosphere, the minor oxygen CO2 isotopologues have anomalous abundances due to their exchange reactions with isotopically fractionated ozone, differentiating them from tropospheric CO2. Previously a model predicted that this anomalous isotopic abundance continues into the mesosphere but lacked verification from experimental observations. Here we use the Atmospheric Chemistry Experiment Fourier Transform Spectrometer which records infrared transmittance spectra of the Earth's limb from low Earth orbit using solar occultation. These infrared spectra provide measurements of global CO2 isotopologue volume mixing ratios (VMRs) from the upper troposphere to the lower thermosphere. Data for the O13CO, 17OCO and 18OCO isotopologues are presented, including seasonal altitude‐latitude VMR distributions. The role of photolysis in the upper atmosphere for 17OCO and 18OCO fractionation has been analyzed and found to be “mass independent.”

• Publication year

  2025

• Venue

  Journal of Geophysical Research: Atmospheres

• Publication date

  2025-11-08

• Fields of study

  Not labeled

• Identifiers
  DOI 10.1029/2024JD042470
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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