Articles | Volume 3, issue 1
Research article
18 Jan 2022
Research article |  | 18 Jan 2022

Sudden stratospheric warmings during El Niño and La Niña: sensitivity to atmospheric model biases

Nicholas L. Tyrrell, Juho M. Koskentausta, and Alexey Yu. Karpechko

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Revised manuscript accepted for WCD
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Cited articles

Baldwin, M. P., Stephenson, D. B., Thompson, D. W., Dunkerton, T. J., Charlton, A. J., and O'Neill, A.: Stratospheric memory and skill of extended‐range weather forecasts, Science, 301, 5633, 636–640,, 2003. 
Bayr, T., Latif, M., Dommenget, D., Wengel, C., Harlaß, J., and Park, W.: Mean-state dependence of ENSO atmospheric feedbacks in climate models, Clim. Dynam., 50, 3171–3194,, 2018. 
Bayr, T., Domeisen, D. I. V., and Wengel, C.: The effect of the equatorial Pacific cold SST bias on simulated ENSO teleconnections to the North Pacific and California, Clim. Dynam., 53, 3771–3789,, 2019. 
Bell, C. J., Gray, L. J., Charlton-Perez, A. J., Joshi, M. M., and Scaife, A. A.: Stratospheric communication of El Niño tele- connections to European winter, J. Climate, 22, 4083–4096,, 2009. 
Butler, A. H., Polvani, L. M., and Deser, C.: Separating the stratospheric and tropospheric pathways of El Niño–Southern Oscillation teleconnections, Environ. Res. Lett., 9, 024015,, 2014. 
Short summary
El Niño events are known to effect the variability of the wintertime stratospheric polar vortex. The observed relationship differs from what is seen in climate models. Climate models have errors in their average winds and temperature, and in this work we artificially reduce those errors to see how that changes the communication of El Niño events to the polar stratosphere. We find reducing errors improves stratospheric variability, but does not explain the differences with observations.