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October 3, 2025Atmospheric chemistry and physicsOpen Access

Stratospheric δ13CO2 observed over Japan and its governing processes

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Authors

SSSatoshi SugawaraSMShinji MorimotoSIShigeyuki Ishidoya

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Overview

Observational analysis reveals δ13CO2 decreases in the mid-stratosphere, indicating CH4 oxidation and gravitational separation are key drivers.

Key Points

  • Stratospheric δ13CO2 has decreased over time, aligning with trends in the troposphere.
  • The average rate of change for δ13CO2 is −0.026 ± 0.001 ‰ yr−1 from 1985 to 2020.
  • A two-dimensional model simulates the δ13CO2 variations, confirming the influence of CH4 oxidation.
  • Stratospheric potential δ13C (δ13CP) shows a time lag of about 5 years behind the tropical troposphere.

Cite This Study

Sugawara et al. (2025) studied this question.

synapsesocial.com/papers/68e040f3a99c246f578b36a2https://doi.org/10.5194/acp-25-11895-2025
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