Journal
SCIENCE
Volume 362, Issue 6420, Pages 1293-+Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aau0747
Keywords
-
Categories
Funding
- China NSFC [41888101, 41731174, 4157020432, 41561144003]
- U.S. NSF [0502535, 1103404, 0823554, 1003690, 1137693, 1337693, 1702816]
- Comer Science and Education Foundation
- Directorate For Geosciences
- Div Atmospheric & Geospace Sciences [0823554, 1003690] Funding Source: National Science Foundation
- Directorate For Geosciences
- Division Of Earth Sciences [1337693] Funding Source: National Science Foundation
Ask authors/readers for more resources
Paired measurements of C-14/C-12 and Th-230 ages from two Hulu Cave stalagmites complete a precise record of atmospheric C-14 covering the full range of the C-14 dating method (similar to 54,000 years). Over the last glacial period, atmospheric C-14/C-12 ranges from values similar to modern values to values 1.70 times higher (42,000 to 39,000 years ago). The latter correspond to C-14 ages 5200 years less than calibrated ages and correlate with the Laschamp geomagnetic excursion followed by Heinrich Stadial 4. Millennial-scale variations are largely attributable to Earth's magnetic field changes and in part to climate-related changes in the oceanic carbon cycle. A progressive shift to lower C-14/C-12 values between 25,000 and 11,000 years ago is likely related, in part, to progressively increasing ocean ventilation rates.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available