H/T to Ireneusz Palmowski for pointing me to this presentation of a paper Regional and temporal variability of solar activity and galactic cosmic ray effects on the lower atmosphere circulation by S. Veretenenko ⇑, M. Ogurtsov Advances in Space Research · February 2012. Background A previous post Quantifying Natural Climate Change presented a study by […]Solar Cyles in Earth Atmosphere — Iowa Climate Science Education
H/T to Ireneusz Palmowski for pointing me to this presentation of a paper Regional and temporal variability of solar activity and galactic cosmic ray effects on the lower atmosphere circulation by S. Veretenenko ⇑, M. Ogurtsov Advances in Space Research · February 2012.
A previous post Quantifying Natural Climate Change presented a study by Dan Pangburn demonstrating that earth temperature fluctuations can be explained by oceanic and solar variations. The oceanic factors are elaborated in numerous posts here under the category Oceans Make Climate. The solar mechanisms are more mysterious, making it more difficult to show how solar activity influences cooler or warmer eras. Cosmoclimatology is a theory advanced by Svensmark that draws a connection between GCRs (Global Cosmic Rays) and cloudiness.
This post present evidence from Russian scientists describing those same Cosmic Rays (GCR) have a dramatic top-down effect on atmospheric circulation by interacting with ozone in the stratosphere. The basic idea is that the Arctic polar vortex shifts from fast and strong, to weak and wavy in response to solar activity (SA).
The published paper can be accessed by the linked title at the top. The slide presentation is here.
Conclusions: In the paper three important findings are described. Text in italics with my bolds.
1. Disturbances of the lower atmosphere circulation associated with solar activity and galactic cosmic ray variations take place over the entire globe, with the processes developing in different latitudinal belts and
regions being closely interconnected. The SA/GCR effects on pressure variations reveal a distinct latitudinal and regional character depending on the circulation peculiarities in the regions under study. The spatial structure of pressure variations correlated with SA/GCR variations is closely related to their influence on the main elements of the large-scale atmospheric circulation, namely on the polar vortex, planetary frontal zones and extratropical cyclones and anticyclones.
2. The temporal structure of the SA/GCR effects on pressure variations at high and middle latitudes of the
Northern hemisphere is characterized by a pronounced ~60-year periodicity which is apparently related to the epochs of the large-scale atmospheric circulation. The reversals of the correlation sign between pressure and sunspot numbers were detected in the 1890s, 1920s, 1950s and in the early 1980s. The sign of the SA/GCR effects seems to depend on the evolution of meridional processes in the atmosphere which, in turn, is determined by the state of the polar vortex.
3. A mechanism of SA/GCR influences on the troposphere circulation is likely to involve changes in the evolution of the polar vortex in the stratosphere of high latitudes. Intensification of the polar vortex associated with solar activity and cosmic ray variations may contribute to the increase of temperature contrasts in planetary frontal zones and, then, to the intensification of extratropical cyclogenesis.
Comment: It seems that the extremely wavy polar vortex in recent years is feature of the current quiet sun, rather than an attribute of global warming.
via Science Matters
June 15, 2020 at 01:16PM