CHLORINE-36 EVIDENCE FOR THE MONO LAKE EVENT IN THE SUMMIT GRIP ICE CORE

Abstract

A distinct peak has been discovered in the 36Cl 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 36Cl peak reflects a higher production rate of all cosmogenic radionuclides, it has an impact on the 14C 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.