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Modelling the stratospheric budget of beryllium isotopes

Gilles Delaygue 1, * Slimane Bekki 2 Édouard Bard 3
* Corresponding author
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
3 Chaire Evolution du climat et de l'océan
CEREGE - Centre européen de recherche et d'enseignement des géosciences de l'environnement
Abstract : A global 2-D (latitude–altitude) model describing both the stratospheric circulation and the detailed formation and growth of stratospheric aerosols is used to simulate the stratospheric cycle of cosmogenic isotopes of beryllium, Be-7 and Be-10. These isotopes have been extensively used as tracers of stratospheric air, as well as of solar variability. The simulation of these isotopes is used to quantify the relative importance of transport, microphysic processes related to aerosols, and radioactive decay, on their concentrations. Calculations of model budget show that the vertical transfer of these isotopes due to the aerosol sedimentation contributes to about half of the stratospheric Be-10 flux into the troposphere, but is negligible for the Be-7 budget. The simulated residence time of these isotopes in the lower stratosphere is monotonically related to the age of air; however, this relationship is neither linear nor uniform, which biases the age of air inferred from these isotopes.
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Gilles Delaygue, Slimane Bekki, Édouard Bard. Modelling the stratospheric budget of beryllium isotopes. Tellus B - Chemical and Physical Meteorology, Taylor & Francis, 2015, 67, pp.28582. ⟨10.3402/tellusb.v67.28582⟩. ⟨hal-01223156⟩



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