Weather and Climate Dynamics
Weather and Climate Dynamics
WCD
Articles | Volume 7, issue 1
Articles | Volume 7, issue 1
https://doi.org/10.5194/wcd-7-277-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/wcd-7-277-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 7, issue 1
Research article
 | 
02 Feb 2026
Research article |  | 02 Feb 2026

The tropospheric response to zonally asymmetric momentum torques: implications for the downward response to wave reflection and SSW events

Wuhan Ning, Chaim I. Garfinkel, Judah Cohen, Ian P. White, and Jian Rao

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Short summary
Whether the zonal structure of a polar vortex matters for surface climate is an open question, with much observational work showing a role but with limited modeling work and demonstration of a causal influence. Here, we isolate this influence using a moist general circulation model. We find that the surface responses differ qualitatively depending on the zonal asymmetries of the shifted polar vortex and concurrently occurring wave reflection events, and provide a mechanistic explanation for why.
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Stratospheric impacts on climate variability and predictability...