the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Signature of the stratosphere-troposphere coupling on recent record-breaking Antarctic sea ice anomalies
Raúl R. Cordero
Sarah Feron
Alessandro Damiani
Pedro J. Llanillo
Jorge Carrasco
Alia L. Khan
Richard Bintanja
Zutao Ouyang
Gino Casassa
Abstract. By influencing the circumpolar westerly winds, the stratospheric polar vortex has played a major role in the Antarctic surface climate in recent decades. However, the footprint of the polar vortex variability in the year-to-year changes of the Antarctic sea ice cover remains obscured. Here, we combine satellite retrievals and reanalysis data to study the response of the sea ice extent around Antarctica to changes in the polar vortex strength. We focused on the last two decades that have seen sharp changes in the stratospheric zonal flow, the tropospheric westerly winds, and the sea ice cover (the latter climbed to record highs in 2013 and 2014 before dropping to record lows in 2017 and 2022). We found that this unprecedented interannual variability has been noticeably influenced by the polar vortex dynamics. The signature of the stratosphere-troposphere coupling is apparent on recent all-time records (highs and lows) in the sea ice around Antarctica.
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Raúl R. Cordero et al.
Status: open (until 22 Jun 2023)
Raúl R. Cordero et al.
Raúl R. Cordero et al.
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