"The sunspot cycle is about to come out of its depression, if a newly discovered mechanism for predicting solar cycles — a migrating jet stream deep inside the sun — proves accurate. And that will add a small amount of warming in the next few years, which were already predicted to be record-setting by two recent studies.
When we last looked at the sun [please, don't try that at home], we were at “a 12-year low in solar ‘irradiance’.” As NASA explained in April: “the sun’s brightness has dropped by 0.02% at visible wavelengths” since the solar minimum of 1996, which was “not enough to reverse the course of global warming.” It’s been “the quietest sun we’ve seen in almost a century,” said sunspot expert David Hathaway of the Marshall Space Flight Center.
The deniers have been rooting for a Maunder Minimum to stifle global warming (which it wouldn’t have done anyway, see here). But human-caused global warming is so strong that not bloody much stifling has been going on given that “this will be the hottest decade in recorded history by far,“ nearly 0.2°C warmer than the 1990s. Heck, even with a La Niña and an unusually inactive sun, 2008 was almost 0.1°C warmer than the decade of the 1990s as a whole — and of course the 1990s were, at the time, the hottest decade in recorded history. Changes in the sun just ain’t the big dog anymore when it comes to driving climate change (see here). [...] "
- donde as perspectivas para a próxima década não são animadoras: continuar a ler em Climate Progress » Blog Archive » National Solar Observatory, NASA say no “Maunder Minimum” — sorry, deniers — Solar Cycle 24 poised to rev up
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