Be⁷ and P³² in ground level air

Abstract

Weekly samples of dust collected from ground level air at Bern (47° N) have been analysed for their contents of cosmic ray produced Be⁷ and P³² during January-September 1965. The observed ratios of Be⁷/P³² place a limit on the spring influx of stratospheric air. It is discussed that the pronounced spring maximum in Be⁷ concentration in ground level air, observed by some investigators at temperate and high latitudes is, to a large part, a manifestation of other meteorological factors, e.g. better vertical mixing within the troposphere, rather than due to a large influx of air from the stratosphere.