Shrinking Sky! Cloud Tops Dropping Closer to Earth, NASA Satellite Finds | Atmospheric Science & Climate Change | Cloud Formation & Height | LiveScience
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The time frame is short, but if future observations show that clouds are truly getting lower, it could have an important effect on global climate change. Clouds that are lower in the atmosphere would allow Earth to cool more efficiently, potentially offsetting some of the warming caused by greenhouse gases.
"We don't know exactly what causes the cloud heights to lower," study researcher Roger Davies of the University of Auckland in New Zealand said in a statement. "But it must be due to a change in the circulation patterns that give rise to cloud formation at high altitude."
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I wonder if lower cloud heights lately, were caused by the lower sunspot counts?
Since both these phenomena seems to trigger global cooling...
I saw this comment online..
It’s important to destinguish between CR’s (which you mention above) and GCR’s (i.e. energy levels), and remember that Svensmarks hypothesis involves muon’s – which are the main source of ionization in the atmosphere at the low cloud heights that he’s interested in. Counts of cosmic-ray muons at low altitudes were historically low when record keeping stopped in the early 90′s.
Svensmark also apparently gets a pretty good fit over the last 20 odd years when he plots Huancayo/Haleakala Neutron data (as a proxy for muon’s), against tropospheric air temperature (HadAT2), or ocean sub-surface water temperature (SODA).
There are also plenty of proxies for solar variability which show that solar activity has remained high throughout the 20th century. Usoskin seems pretty clear about this in Fig 4. from this paper showing Be10 abundance:
http://cc.oulu.fi/~usoskin/personal/2002ja009343.pdf
The above is from a discussion regarding the CERN CLOUD results..
CERN experiment confirms cosmic ray action « Calder's Updates