Abstract
Atmospheric concentrations of 7Be and 10Be were investigated in Dazaifu, Fukuoka (1998–2001) and Tokyo (2002–2014) from 1998 to 2014. The seasonal variations were roughly the same for each year, with high 7Be and 10Be concentrations and high 10Be/7Be isotopic ratios caused by strong stratosphere-troposphere exchange (STE) from February to June, and fluctuating 7Be and 10Be concentrations and constant 10Be/7Be ratios caused by vertical convection in the troposphere from July to December. Using a three-box model, the residence time of the stratosphere, the troposphere, and the boundary layer were estimated to be 2 years, 55 days, and 3 days, respectively, and the mass flux observed during the STE season was estimated to be six times higher than the mass flux observed during the vertical convection season. The amplitude of solar modulation was also found to be three times larger than the amplitude of relative cosmic ray intensity at the Earth’s surface.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
