Assessing the differences between the IntCal and Greenland ice-core time scales for the last 14,000 years via the common cosmogenic radionuclide variations

作者：Muscheler Raimund^*; Adolphi Florian; Knudsen Mads F

来源：Quaternary Science Reviews, 2014, 106: 81-87.

DOI：10.1016/j.quascirev.2014.08.017

• Time scales
• (14)c
• Be-10
• Ice cores
• Intcal13
• Cosmic rays

Variations in galactic cosmic rays reaching the Earth%26apos;s atmosphere produce globally synchronous variations in the production rates of cosmogenic radionuclides. In consequence, they leave their imprint in tree-ring C-14 and ice-core Be-10 records. By identifying this signal and correcting for the known geochemical influences on the radionuclides, it is possible to compare and synchronize the tree-ring chronology and the Greenland ice-core time scale. Here, we compare the IntCal13 and the GICCO5 time scales for the last 14,000 years via identification and synchronization of the common short-term variations in the ice-core Be-10 and tree-ring C-14 records most likely induced by variations in the solar modulation of galactic cosmic rays. We conclude that systematic time-scale differences have to be accounted for if ice-core and C-14-dated records are compared on decadal time scales. These are mostly within the uncertainties of the time scales and the method proposed here. However, for large parts of the mid to late Holocene (i.e. after 7000 yrs BP) the best agreement between ice-core Be-10 and tree-ring C-14 records is obtained for time shifts outside the stated errors of the respective time scales. A transfer function is proposed that can be applied to synchronize the GICCO5 ice-core time scale to the radiocarbon time scale.

• 出版日期2014-12-15