Abstract
Over a period of 12 years, the lower tropospheric content of radionuclides beryllium 7, phosphorus 32, and phosphorus 33 has been measured at a mountain observatory in the Bavarian Alps. These nuclides are generated by cosmic radiation, mainly in the stratosphere. To control the effect of atmospheric nuclear explosions, the heavy metal fallout was determined. Production of these radionuclides is almost independent of solar activity, the influx into the troposphere is subject to this influence. In the exchange between stratosphere and troposphere periodicities are shown that depart from the annual variation. The effect of stratospheric air on the ozone content of the lower troposphere is investigated. The different half-lives of the radionuclides allow an assessment of the stratospheric residence times.
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