Bulg. J. Phys. vol.48 no.1 (2021), pp. 004-013



Impact of Decadal Variations of Galactic Cosmic Rays on Earth's Climate Variability

N. Kilifarska
Climate, Atmosphere and Water Research Institute, Bulgarian Academy of Sciences, 66, Tsarigradsko Shosse Blvd, 1784 Sofia, Bulgaria
Abstract. The existence of quasi-decadal variability in some climatic variables is well documented in scientific literature. We show evidence that this "solar signal" should be attributed to the variations of galactic cosmic rays intensity (GCR), which is modulated by the 11-year solar cycle. The GCR influence is transmitted down to the planetary surface by the lower stratospheric ozone - an additional production or destruction of which is initiated by the low energy electrons in the Regener-Pfotzer maximum (an ionisation layer produced by GCR in the lower atmosphere). Furthermore, the ozone variability impacts the upper tropospheric stability and the humidity near the tropopause. The greatest impact of the latter in the Earth's radiation balance increases or decrease regionally the strength of the greenhouse effect, and consequently - the near surface temperature.

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