Bulg. J. Phys. vol.48 no.1 (2021), pp. 014-025



Galactic Cosmic Rays Influence on the Earth's Climatic Modes

Ts. Velichkova1, N. Kilifarska2
1National Institute of Geophysics, Geodesy and Geography, Bulgarian Academy of Sciences, 3 Acad. G. Bonchev, Sofia 1113, Bulgaria
2Climate, Atmosphere and Water Research Institute, Bulgarian Academy of Sciences, 66, Tsarigradsko Shosse Blvd, 1784 Sofia, Bulgaria
Abstract. The regionality of climate response to the contemporary raise of global surface temperature puts with new keenness the question of the impacting factors and the mechanisms of their influence on climatic modes. This article shows evidence for a synchronisation between spatial-temporal variations of the lower stratospheric ozone and two regional climate patterns known as ENSO and NAO climatic modes. The ozone density in the lower stratosphere is substantially influenced by the secondary ionisation, created at these altitudes by galactic cosmic rays (GCR). So the irregular distribution of GCR over the globe (due to the geomagnetic lensing) and their temporal variability (modulated by the solar dynamo) is projected on the ozone variability. The mechanism, transmitting the GCR 'signal' down to the planetary surface, goes through the ozone's control on the near tropopause temperature and humidity, which alter the strength of greenhouse warming.

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