Chlorine-36 evidence for the Mono Lake event in the Summit GRIP ice core

• Published in: Earth and Planetary Science Letters
• Main Authors: Wagner, G., Beer, J., Laj, C., Kissel, C., Masarik, J., Muscheler, R., Synal, H.-A.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Elsevier 2000
• Subjects: Cl-36; magnetic field; paleomagnetism; cosmogenic elements; radioactive elements; ice core
• Online Access: https://doi.org/10.1016/S0012-821x(00)00196-5

A distinct peak has been discovered in the 36 Cl data from the GRIP ice core between the Dansgaard Oeschger (D-O) events 6 and 7 at approximately 32 kyr BP. This peak can be attributed to a minimum of the geomagnetic dipole field associated with the Mono Lake event. Since the 36 Cl peak reflects a higher production rate of all cosmogenic radionuclides, it has an impact on the 14 C dating of the last ice age. Furthermore, it provides an additional time marker similar to a peak found earlier corresponding to the Laschamp event at approximately 39 kyr BP.