Antarctica is one of the regions where the earth's surface is warming most rapidly. The interdecadal warming trend over much of Antarctica during the austral winter is about 1 °C decade -1, which is almost twice that of the global mean. There is increasing observational and modeling evidence that high-latitude warming is linked to localized heating in the tropics. Here we show that interdecadal changes in the spatial patterns of the extratropical response to various phases of the Madden-Julian oscillation (MJO) explain 10-20% of the interdecadal warming over Antarctica, possibly through the poleward propagation of tropically forced Rossby wave trains.
- Antarctic warming
- Rossby wave trains