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

Data sets

ECHAM6 Bias Correction ENSO Nicholas L. Tyrrell and Alexey Yu. Karpechko

ERA5 hourly data on pressure levels from 1979 to present H. Hersbach, B. Bell, P. Berrisford, G. Biavati, A. Horányi, J. Muñoz Sabater, J. Nicolas, C. Peubey, R. Radu, I. Rozum, D. Schepers, A. Simmons, C. Soci, D. Dee, and J.-N. Thépaut

Hadley Centre Sea Ice and Sea Surface Temperature data set (HadISST) Met Office Hadley Centre

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.