Synchronizing ice-core and U / Th timescales in the Last Glacial Maximum using Hulu Cave 14C and new 10Be measurements from Greenland and Antarctica ...

• Main Authors: Sinnl, Giulia, Adolphi, Florian, Christl, Marcus, Welten, Kees C., Woodruff, Thomas, Caffee, Marc, Svensson, Anders, Muscheler, Raimund, Rasmussen, Sune Olander
• Format: Article in Journal/Newspaper
• Language: English
• Published: ETH Zurich 2023
• Subjects: Antarc*; Antarctic; Antarctica; Greenland; Greenland ice core; ice core; North Atlantic
• Online Access: https://dx.doi.org/10.3929/ethz-b-000619542; http://hdl.handle.net/20.500.11850/619542

Between 15 and 27 kyr b2k (thousands of years before 2000 CE) during the last glacial, Greenland experienced a prolonged cold stadial phase, interrupted by two short-lived warm interstadials. Greenland ice-core calcium data show two periods, preceding the interstadials, of anomalously high atmospheric dust loading, the origin of which is not well understood. At approximately the same time as the Greenland dust peaks, the Chinese Hulu Cave speleothems exhibit a climatic signal suggested to be a response to Heinrich Event 2, a period of enhanced ice-rafted debris deposition in the North Atlantic. In the climatic signal of Antarctic ice cores, moreover, a relative warming occurs between 23 and 24.5 kyr b2k that is generally interpreted as a counterpart to a cool climate phase in the Northern Hemisphere. Proposed centennial-scale offsets between the polar ice-core timescales and the speleothem timescale hamper the precise reconstruction of the global sequence of these climatic events. Here, we examine two new ... : Climate of the Past, 19 (6) ...