Climate of the Past
Climate of the Past
CP
Articles | Volume 21, issue 1
Articles | Volume 21, issue 1
https://doi.org/10.5194/cp-21-67-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-21-67-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 21, issue 1
Research article
 | 
13 Jan 2025
Research article |  | 13 Jan 2025

A stretched polar vortex increased mid-latitude climate variability during the Last Glacial Maximum

Yurui Zhang, Hans Renssen, Heikki Seppä, Zhen Li, and Xingrui Li

Supplement

https://doi.org/10.5194/cp-21-67-2025-supplement

Data sets

A new multi-variable benchmark for Last Glacial Maximum climate simulations Sean Cleator et al. https://doi.org/10.17864/1947.244

Model code and software

CESM2-FV2 model output prepared for CMIP6 PMIP lgm NCAR https://doi.org/10.22033/ESGF/CMIP6.17642

MIROC MIROC-ES2L model output prepared for CMIP6 PMIP lgm Rumi Ohgaito et al. https://doi.org/10.22033/ESGF/CMIP6.5644

MPI-M MPI-ESM1.2-LR model output prepared for CMIP6 PMIP lgm Johann Jungclaus et al. https://doi.org/10.22033/ESGF/CMIP6.6642

AWI AWI-ESM1.1LR model output prepared for CMIP6 PMIP lgm Xiaoxu Shi et al. https://doi.org/10.22033/ESGF/CMIP6.9330

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Short summary
The upper and lower atmospheres interact. The polar regions, with high-speed, cyclonically rotating winds, provide a window through which upper winds affect surface weather and climate variability. By analysing climate model results, we found that ice sheets induced anomalous upward wave propagation and stretched the rotating winds towards North America, increasing the likelihood of cold-air outbreaks at the mid-latitudes. This accounts for the enhanced winter cooling at these latitudes.
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