Articles | Volume 16, issue 10
Atmos. Chem. Phys., 16, 6241–6261, 2016
https://doi.org/10.5194/acp-16-6241-2016
Atmos. Chem. Phys., 16, 6241–6261, 2016
https://doi.org/10.5194/acp-16-6241-2016

Research article 24 May 2016

Research article | 24 May 2016

Fast descent routes from within or near the stratosphere to the surface at Fukuoka, Japan, studied using 7Be measurements and trajectory calculations

Hisanori Itoh and Yukinori Narazaki

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Short summary
By using high concentrations of 7Be as an indicator, we clarify fast descent routes from the stratosphere to Earth's surface in Japan. Most routes arise from high latitudes through the following processes: descent associated with a tropopause fold, southward movement with slow descent at the rear side of a strong trough, and strong descent at the south edge of the trough. The reason that high concentrations of 7Be occur most frequently in spring is explained.
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