The past 5000 years history of solar modulation of cosmic radiation from 10 Be and 14 C studies
10 Be is produced in a similar way as 14 C by the interaction of cosmic radiation with the nuclei in the atmosphere. Assuming that the 10 Be and 14 C variation are proportional and considering the different behaviour in the Earth system, the 10 Be concentrations in ice cores can be compared with the...
| Published in: | Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences |
|---|---|
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
The Royal Society
1990
|
| Subjects: | |
| Online Access: | http://dx.doi.org/10.1098/rsta.1990.0028 https://royalsocietypublishing.org/doi/pdf/10.1098/rsta.1990.0028 |
| Summary: | 10 Be is produced in a similar way as 14 C by the interaction of cosmic radiation with the nuclei in the atmosphere. Assuming that the 10 Be and 14 C variation are proportional and considering the different behaviour in the Earth system, the 10 Be concentrations in ice cores can be compared with the 14 C variations in tree rings. A high correlation is found for the short-term variations ( 14 C-Suess-wiggles). They reflect with a high probability production rate variations. More problematic is the interpretation of the long-term trends of 14 C and 10 Be. Several explanations are discussed. The reconstructed CO 2 concentrations in ice cores indicate a rather constant value (280 ± 10 p.p.m. by volume) during the past few millenia. Measurements on the ice core from Byrd Station, Antarctica, during the period 9000 to 6000 years BP indicate a decrease that might be explained by the extraction of CO 2 from the atmosphere-ocean system to build the terrestrial biomass pool during the climatic optimum. |
|---|