The Dole effect over the last two glacial-interglacial cycles

Detailed measurements of δ18O of atmospheric oxygen performed on air trapped in the Vostok ice cores (Antarctica) are used to extend the record of the Dole effect over two climatic cycles (back to 240 kyr B.P.). Except for glacial terminations I and II and for an unexpected minimum occurring around...

Full description

Saved in:
Bibliographic Details
Published in:Journal of Geophysical Research 1999-06, Vol.104 (D12), p.14199-14208
Main Authors: Malaizé, B., Paillard, D., Jouzel, J., Raynaud, D.
Format: Article
Language:English
Subjects:
Continental interfaces, environment
Earth sciences
Earth, ocean, space
Exact sciences and technology
Geochemistry
Isotope geochemistry
Isotope geochemistry. Geochronology
Marine and continental quaternary
Mineralogy
Ocean, Atmosphere
Sciences of the Universe
Silicates
Surficial geology
Water geochemistry
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Detailed measurements of δ18O of atmospheric oxygen performed on air trapped in the Vostok ice cores (Antarctica) are used to extend the record of the Dole effect over two climatic cycles (back to 240 kyr B.P.). Except for glacial terminations I and II and for an unexpected minimum occurring around 175 kyr, the Dole effect shows small variations (ΔDole within ± 0.5‰). These small variations, however, show a well‐marked 23 kyr precessional periodicity, thus confirming the results obtained by Bender et al. [1994a] for the first climatic cycle. To explain the minimum value reached around 175 kyr, we invoke the possibility of a peak in the oceanic productivity linked to climatic events induced at low latitudes under glacial conditions.
ISSN:0148-0227
2169-897X
2156-2202
2169-8996
DOI:10.1029/1999JD900116