Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 26, issue 21
Articles | Volume 26, issue 21
https://doi.org/10.5194/acp-26-15405-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-26-15405-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 26, issue 21
Research article
 | 
03 Nov 2026
Research article |  | 03 Nov 2026

Characterizing variability and vertical structure of water vapor in the extratropical lower stratosphere

Emily Nicole Tinney, William J. Randel, and Jun Zhang

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Short summary
Water vapor in the stratosphere plays an important role in Earth’s climate. The moist lower atmosphere and the drier stratosphere meet at the tropopause, creating a complex transition region. Using satellite observations and computer model simulations, this study examines how water vapor varies with height and over time near this boundary. We find that satellite datasets disagree on long-term changes, but consistently show that this transition layer extends about 2.5 kms into the stratosphere.
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