Climate-change impact on the 20th-century relationship between the Southern Annular Mode and global mean temperature.

Sci Rep · 2013 · PMC3687247 · PMID 23784087

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a positive trendno p-value reported

Over the past several decades Antarctic ozone depletion and emissions of greenhouse gases have been forcing a positive trend of the SAM 2 18 , as GMT trends up.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.