The Influence of Interdecadal Changes in Boreal Winter Teleconnections Around the 1980s on Planetary Waves and Stratospheric Sudden Warmings

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Why is it important?

The trend and interdecadal changes in stratospheric sudden warmings (SSWs) are a scientific problem. However, due to the large interannual variability of SSWs and the shortage of stratospheric data before satellite observations were applied, there is considerable uncertainty in the SSW trend. The study found that the combination of tropospheric Pacific North American teleconnection (PNA) and western Pacific teleconnection (WP) is closely related to the total duration of SSWs in winter. Along with the interdecadal changes in this teleconnection combination around 1980, the frequency, intensity and duration of SSWs have also changed significantly. The results of this study enhance the credibility of the increase of SSWs obtained from the reanalysis data.