Some interesting literature on the QBO and its influence of tropical convection and the general circulation.
https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2011JD016317
https://journals.ametsoc.org/view/journals/atsc/72/9/jas-d-15-0035.1.xml?tab_body=abstract-display
https://rmets.onlinelibrary.wiley.com/doi/full/10.1002/qj.4287
https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2018JD029296
https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2022JD037737
https://www.jstage.jst.go.jp/article/jmsj/101/6/101_2023-026/_article/-char/ja/
I’d argue the QBO has substantial sway over static stability in the deep tropics, which is why tropical convection and general circulation respond axisymmetrically to the QBO cycles.
In other words, the QBO’s effect on the mass circulation (and stratospheric vortex, by extension) directly affects tropical (and global) weather/climate patterns. It is through this medium of communication that ENSO/MJO forcings/etc are projected through.
Another year with a very sudden demise of summer. These stats are for MBY.
Average temp first 10 days of September = 67.3
Average temp for the last 10 days = 58.6
An 8.7 degree drop for two periods that are only separated by 10 days in between.