14 C Activity and Global Carbon Cycle Changes over the Past 50,000 Years
Top Cited Papers
- 9 January 2004
- journal article
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 303 (5655) , 202-207
- https://doi.org/10.1126/science.1090300
Abstract
A series of 14C measurements in Ocean Drilling Program cores from the tropical Cariaco Basin, which have been correlated to the annual-layer counted chronology for the Greenland Ice Sheet Project 2 (GISP2) ice core, provides a high-resolution calibration of the radiocarbon time scale back to 50,000 years before the present. Independent radiometric dating of events correlated to GISP2 suggests that the calibration is accurate. Reconstructed 14C activities varied substantially during the last glacial period, including sharp peaks synchronous with the Laschamp and Mono Lake geomagnetic field intensity minimal and cosmogenic nuclide peaks in ice cores and marine sediments. Simulations with a geochemical box model suggest that much of the variability can be explained by geomagnetically modulated changes in 14C production rate together with plausible changes in deep-ocean ventilation and the global carbon cycle during glaciation.Keywords
This publication has 31 references indexed in Scilit:
- Does the Trigger for Abrupt Climate Change Reside in the Ocean or in the Atmosphere?Science, 2003
- A High-Resolution Absolute-Dated Late Pleistocene Monsoon Record from Hulu Cave, ChinaScience, 2001
- Atmospheric radiocarbon during the Younger Dryas: production, ventilation, or both?Earth and Planetary Science Letters, 2001
- Rapid Changes in the Hydrologic Cycle of the Tropical Atlantic During the Last GlacialScience, 2000
- Atmospheric CO2 concentration from 60 to 20 kyr BP from the Taylor Dome Ice Core, AntarcticaGeophysical Research Letters, 2000
- Calibration of the 14C time scale to >40 ka by 234U–230Th dating of Lake Lisan sediments (last glacial Dead Sea)Earth and Planetary Science Letters, 2000
- The Greenland Ice Sheet Project 2 depth‐age scale: Methods and resultsJournal of Geophysical Research: Oceans, 1997
- Deep circulation change linked to HEINRICH Event 1 and Younger Dryas in a middepth North Atlantic CorePaleoceanography and Paleoclimatology, 1994
- Changes in the distribution of δ13C of deep water ΣCO2 between the Last Glaciation and the HolocenePaleoceanography and Paleoclimatology, 1988
- The impact of cold North Atlantic sea surface temperatures on climate: implications for the Younger Dryas cooling (11?10 k)Climate Dynamics, 1986