What drives the southern subtropical anticyclones in austral winter?

What is it about?

The southern subtropical anticyclones are notably stronger in austral winter than in summer, which is in contrast with the Northern Hemisphere in which subtropical anticyclones are more intense in boreal summer consistent with the monsoon heating paradigm. Specially designed model experiments show that during boreal summer enhanced tropical convection activity in the Northern Hemisphere plays important roles in strengthening the southern subtropical anticyclones

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