Infrared active gases are likely to change the dynamics and the stability of the atmosphere

Examination of the monthly ground-level air concentration of the spallation product Be7 from up to three decades at 8 stations in 4 European countries shows a twofold trend for some specific months of the year. This trend is related to the month with the lowest concentration of the year and to the ratio of the month with the highest to that with the lowest concentration. Discussion of the possible causes for that trend leads to the conclusion that a steady change of the dynamic of the atmosphere can explain these findings. The positive trend of some seasonal Be7 concentrations indicate a positive trend of the stratospheric/tropospheric exchange possibly connected with higher tropospheric vertical diffusion. The general finding is commensurate with the trend of exponentially growing concentration of climatic gases within the atmosphere during the last decades.