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This is really worrying:
Observations from the Weddell Sea in Antarctica show evidence of warming and shrinking Antarctic Bottom Water over the past 30 years driven by climatic, wind, and sea-ice changes. This is the coldest and densest water mass on the planet. It’s shrinking has consequences for the ocean's ability to store heat, capture carbon and supply abyssal waters with oxygen.
NatureSlowdown of Antarctic Bottom Water export driven by climatic wind and sea-ice changes - Nature Climate ChangeDense-water formation around Antarctica could be reduced as climate change alters sea-ice formation and circulation patterns. This study shows there has been an over 40% reduction in dense-water formation in the Weddell Sea since 1992, which could affect global overturning circulation.