From 1974 to 1976, an unexpected large hole appeared in the Weddell Sea winter sea-ice cover, a consequence of ocean heat carried to the sea surface by convection. This may have been a window to the past, as model analysis suggests anthropogenic climate change will diminish the chances of a repeat performance.
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Gordon, A. Southern Ocean polynya. Nature Clim Change 4, 249–250 (2014). https://doi.org/10.1038/nclimate2179
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DOI: https://doi.org/10.1038/nclimate2179
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