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Nguyen, T. H., K. Ishijima, S. Sugawara, and F. Hasebe, (2021): Application of a nudged general circulation model to the interpretation of the mean age of air derived from stratospheric samples in the tropics. J. Meteor. Soc. Japan, 99, 1149-1167.
https://doi.org/10.2151/jmsj.2021-056
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Plain Language Summary: The age of air is a transport characteristic of the stratospheric general circulation. Vertical profile of the age of air estimated from cryogenic air samples taken over Biak, Indonesia is investigated by applying the boundary impulse evolving response (BIER) method and Lagrangian backward trajectories to the transport field simulated by a general circulation model nudged to reanalysis.
 

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Highlights:

• The profile of CO₂ age is reproduced reasonably well by the Lagrangian method, whereas the BIER method overestimates the CO₂ age above 25 km altitude possibly due to high diffusivity in the transport model.
• SF6 age is only reproducible in the lower stratosphere, and far exceeds the estimates from the Lagrangian method above 25 km altitude due to mesospheric SF6 loss.