Early Holocene climate oscillations recorded in three Greenland ice cores

A new ice core chronology for the Greenland DYE-3, GRIP, and NGRIP ice cores has been constructed, making it possible to compare the 6180 and accumulation signals recorded in the three cores on an almost annual scale throughout the Holocene. We here introduce the new time scale and investigate 6180 and accumulation anomalies that are common to the three cores in the Early Holocene (7.9-11.7 ka before present). Three time periods with significant and synchronous anomalies in the 6180 and accumulation signals stand out: the well-known 8.2 ka event, an event of shorter duration but of almost similar amplitude around 9.3 ka before present, and the Preboreal Oscillation during the first centuries of the Holocene. For each of these sections, we present a delta(18) anomaly curve and a common accumulation signal that represents regional changes in the accumulation rate over the Greenland ice cap. (C) 2007 Elsevier Ltd. All rights reserved.