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- Title
Sources of plutonium in the atmosphere and stratosphere-troposphere mixing.
- Authors
Hirose, Katsumi; Povinec, Pavel P.
- Abstract
Plutonium isotopes have primarily been injected to the stratosphere by the atmospheric nuclear weapon tests and the burn-up of the SNAP-9A satellite. Here we show by using published data that the stratospheric plutonium exponentially decreased with apparent residence time of 1.5 ± 0.5 years, and that the temporal variations of plutonium in surface air followed the stratospheric trends until the early 1980s. In the 2000s, plutonium and its isotope ratios in the atmosphere varied dynamically, and sporadic high concentrations of 239,240Pu reported for the lower stratospheric and upper tropospheric aerosols may be due to environmental events such as the global dust outbreaks and biomass burning.
- Subjects
PLUTONIUM; PLUTONIUM isotopes; NUCLEAR weapons; TROPOSPHERIC aerosols; STRATOSPHERE; BIOMASS burning
- Publication
Scientific Reports, 2015, p15707
- ISSN
2045-2322
- Publication type
Article
- DOI
10.1038/srep15707