August 5, 2009

A Copenhagen Consensus

Svensmark has a new paper and it is a doozy: Cosmic ray decreases affect atmospheric aerosols and clouds (full text PDF).

The major conclusion: “A link between the Sun, cosmic rays, aerosols, and liquid-water clouds appears to exist on a global scale…”

This paper confirms 13 years of discoveries that suggest a key role for cosmic rays in climate change. It links observable variations in the world’s cloudiness to laboratory experiments in Copenhagen showing how cosmic rays help generate atmospheric aerosols.

This is important, because it confirms the existence of a sun-earth atmospheric modulation mechanism for clouds and aerosols. It is seen in an event called a Forbush Decrease, which A Forbush decrease is a rapid decrease in the observed galactic cosmic raycoronal mass ejection (CME). It occurs due to the magnetic field of the plasma solar wind sweeping some of the galactic cosmic rays away from Earth. Here is what the Oulu Neutron Monitor plot looked like during such and event on May15th, 2005:

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