期刊
GEOPHYSICAL RESEARCH LETTERS
卷 40, 期 14, 页码 3693-3697出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/grl.50679
关键词
North Atlantic; radiocarbon; reservoir age; Atlantic meridional overturning circulation; Heinrich Stadial 1; Mystery Interval
资金
- NSF [MGG-0926735]
- Division Of Ocean Sciences
- Directorate For Geosciences [926735] Funding Source: National Science Foundation
Constraints on the timing of Atlantic meridional overturning circulation (AMOC) changes during the last deglaciation are fundamental to understanding the climate's rapid response to insolation forcing. However, uncertainty about high-latitude North Atlantic (HLNA) radiocarbon reservoir ages has previously precluded robust age model development for this critical region. HLNA reservoir ages also serve as a proxy for AMOC strength. We present regionally averaged HLNA reservoir ages for 0 to 41 thousand years before the present (kyr BP) based on over 500 radiocarbon dates from 33 North Atlantic cores. An early deglacial increase to >1000 C-14 yr reservoir ages between 18.5 and 16.5 kyr BP suggests reduced AMOC before peak Heinrich Stadial 1 (HS1) ice-rafted debris (IRD). A rapid decrease in reservoir ages coincident with the IRD maximum at 16 kyr BP indicates strong stratification of the upper water column caused by massive freshwater release.
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