Evidence of tropospheric uplift into the stratosphere via the tropical western Pacific cold trap

Sun, Xiaoyu; Müller, Katrin; Palm, Mathias; Ritter, Christoph; Ji, Denghui; Röpke, Tim Balthasar; Notholt, Justus

doi:https://doi.org/10.5194/acp-25-6881-2025

Articles | Volume 25, issue 13

https://doi.org/10.5194/acp-25-6881-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-25-6881-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 25, issue 13

Research article

|

08 Jul 2025

Research article |

| 08 Jul 2025

Evidence of tropospheric uplift into the stratosphere via the tropical western Pacific cold trap

Xiaoyu Sun, Katrin Müller, Mathias Palm, Christoph Ritter, Denghui Ji, Tim Balthasar Röpke, and Justus Notholt

Supplement

https://doi.org/10.5194/acp-25-6881-2025-supplement

Data sets

ACCLIP: ComCAL Raman Lidar Data. Version 1.0 X. Sun et al. https://doi.org/10.26023/SD3W-WKBH-5X13

ERA5 monthly averaged data on pressure levels from 1940 to present H. Hersbach et al. https://doi.org/10.24381/cds.6860a573

Reanalysis Tropopause Data Repository Lars Hoffmann and Reinhold Spang https://doi.org/10.26165/JUELICH-DATA/UBNGI2

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Short summary

We studied how air moves from the lower atmosphere to the stratosphere over the tropical western Pacific. Using observations and air tracking, we found that, in winter, air ascends and cold temperatures freeze water out, drying it before it enters the stratosphere. In summer, air tends to sink after cloud formation. This process affects water vapor amounts in the stratosphere, influencing the greenhouse effect and climate.