Production of cosmogenic isotopes ~7Be, ~(10)Be, ~(14)C, ~(22)Na, and ~(36)Cl in the atmosphere: Altitudinal profiles of yield functions

摘要

New consistent and precise computations of the production of five cosmogenic radioisotopes, ~7Be, ~(10)Be, ~(14)C, ~(22)Na, and ~(36)Cl, in the Earth's atmosphere by cosmic rays are presented in the form of tabulated yield functions. For the first time, a detailed set of the altitude profiles of the production functions is provided which makes it possible to apply the results directly as input for atmospheric transport models. Good agreement with most of the earlier published works for columnar and global isotopic production rates is shown. Altitude profiles of the production are important, in particular for such tasks as studies of strong solar particle events in the past, precise reconstructions of solar activity on long-term scale, tracing air mass dynamics using cosmogenic radioisotopes, etc. As an example, computations of the ~(10)Be deposition flux in the polar region are shown for the last decades and also for a period around 780 A.D. and confronted with the actual measurements in Greenland and Antarctic ice cores.