In an email conversation with Mashable, the study's lead author says that since 2000,
observed changes in the jet stream have increasingly led to «a synchronization of extremes around the hemisphere.»
The advantage of recognising a reversed sign for the solar effect high up
in the atmosphere is that it enables a scenario whereby the bottom up effects of ocean cycles and the top down effects of solar variability can be seen to be engaged
in a complex ever
changing dance with the primary climate response being
changes in the tropospheric air circulation systems to give us the
observed natural climate variability via cyclical latitudinal shifts
in all the air circulation systems and notably the
jet streams.