(Table 1) Age-depth relation in sediment core TTN057-13-PC4

The last glacial to interglacial transition was studied using down core records of stable isotopes in diatoms and foraminifera as well as surface water temperature, sea ice extent, and ice-rafted debris (IRD) concentrations from a piston core retrieved from the Atlantic sector of the Southern Ocean....

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Bibliographic Details
Main Authors: Shemesh, Aldo, Hodell, David A, Crosta, Xavier, Kanfoush, Sharon L, Charles, Christopher D, Guilderson, Thomas P
Format: Dataset
Language:English
Published: PANGAEA 2002
Subjects:
Age
14C AMS
14C calibrated
dated
dated standard deviation
Calendar age
DEPTH
sediment/rock
PC
Piston corer
Reference/source
Sample code/label
TN057-13-PC4
Antarctic
Southern Ocean
Antarc*
ice core
Sea ice
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.842939
https://doi.org/10.1594/PANGAEA.842939
Description
Summary:The last glacial to interglacial transition was studied using down core records of stable isotopes in diatoms and foraminifera as well as surface water temperature, sea ice extent, and ice-rafted debris (IRD) concentrations from a piston core retrieved from the Atlantic sector of the Southern Ocean. Sea ice is the first variable to change during the last deglaciation, followed by nutrient proxies and sea surface temperature. This sequence of events is independent of the age model adopted for the core. The comparison of the marine records to Antarctic ice CO2 variation depends on the age model as 14C determinations cannot be obtained for the time interval of 29.5-14.5 ka. Assuming a constant sedimentation rate for this interval, our data suggest that sea ice and nutrient changes at about 19 ka B.P. lead the increase in atmospheric pCO2 by approximately 2000 years. Our diatom-based sea ice record is in phase with the sodium record of the Vostok ice core, which is related to sea ice cover and similarly leads the increase in atmospheric CO2. If gas exchange played a major role in determining glacial to interglacial CO2 variations, then a delay mechanism of a few thousand years is needed to explain the observed sequence of events. Otherwise, the main cause of atmospheric pCO2 change must be sought elsewhere, rather than in the Southern Ocean.

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