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East Antarctic cooling induced by decadal changes in Madden-Julian oscillation during austral summer
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2021
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Source: Science Advances, 7(26)
[PDF-1.39 MB]
Details:
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Journal Title:Science Advances
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NOAA Program & Office:
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Description:While West Antarctica has experienced the most significant warming in the world, a profound cooling trend in
austral summer was observed over East Antarctica (30°W to 150°E, 70° to 90°S) from 1979 to 2014. Previous studies
attributed these changes to high-latitude atmospheric dynamics, stratospheric ozone change, and tropical sea surface temperature anomalies. We show that up to 20 to 40% of the observed summer cooling trend in East Antarctica was forced by decadal changes of the Madden-Julian oscillation (MJO). Both observational analysis and
climate model experiments indicate that the decadal changes in the MJO, characterized by less (more) atmospheric deep convection in the Indian Ocean (western Pacific) during the recent two decades, led to the net cooling trend over East Antarctica through modifying atmospheric circulations linked to poleward-propagating
Rossby wave trains. This study highlights that changes in intraseasonal tropical climate patterns may result in
important climate change over Antarctica.
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Source:Science Advances, 7(26)
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Rights Information:CC BY-NC
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Compliance:Submitted
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