Weakening of the tropical tropopause layer cold trap with global warming

Bourguet, Stephen; Linz, Marianna

doi:https://doi.org/10.5194/acp-23-7447-2023

Articles | Volume 23, issue 13

https://doi.org/10.5194/acp-23-7447-2023

© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-23-7447-2023

© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 23, issue 13

Research article

|

06 Jul 2023

Research article |

| 06 Jul 2023

Weakening of the tropical tropopause layer cold trap with global warming

Stephen Bourguet and Marianna Linz

Supplement

https://doi.org/10.5194/acp-23-7447-2023-supplement

Data sets

The ERA5 global reanalysis (https://apps.ecmwf.int/data-catalogues/era5/?class=ea) H. Hersbach, B. Bell, P. Berrisford, S. Hirahara, A. Horányi, J. Muñoz-Sabater, J. Nicolas, C. Peubey, R. Radu, D. Schepers, A. Simmons, C. Soci, S. Abdalla, X. Abellan, G. Balsamo, P. Bechtold, G. Biavati, J. Bidlot, M. Bonavita, G. De Chiara, P. Dahlgren, D. Dee, M. Diamantakis, R. Dragani, J. Flemming, R. Forbes, M. Fuentes, A. Geer, L. Haimberger, S. Healy, R. J. Hogan, E. Hólm, M. Janisková, S. Keeley, P. Laloyaux, P. Lopez, C. Lupu, G. Radnoti, P. de Rosnay, I. Rozum, F. Vamborg, S. Villaume, and J.-N. Thépaut https://doi.org/10.1002/qj.3803

The model data outputs from the Atmospheric Chemistry & Climate Model Intercomparison Project (ACCMIP) D. Shindell, J. F. Lamarque, W. Collins, V. Eyring, T. Nagashima, V. Naik, S. Szopa, and G. Zeng http://catalogue.ceda.ac.uk/uuid/ded523bf23d59910e5d73f1703a2d540

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Short summary

Here, we show how projected changes to tropical circulation will impact the water vapor concentration in the lower stratosphere, which has implications for surface climate and stratospheric chemistry. In our transport scenarios with slower east–west winds, air parcels ascending into the stratosphere do not experience the same cold temperatures that they would today. This effect could act in concert with previously modeled changes to stratospheric water vapor to amplify surface warming.