10.1594/PANGAEA.729936
Oppo, Delia W
Delia W
Oppo
0000-0003-2946-5904
Raymo, Maureen E
Maureen E
Raymo
Lohmann, Gerrit
Gerrit
Lohmann
0000-0003-2089-733X
Mix, Alan C
Alan C
Mix
0000-0001-7108-3534
Wright, James D
James D
Wright
0000-0001-5212-9146
Prell, Warren L
Warren L
Prell
Stable isotope record of benthic foraminifera from DSDP Site 68-502
PANGAEA
1995
Drilling/drill rig
Composite Core
Leg68
Glomar Challenger
Deep Sea Drilling Project (DSDP)
1979-08-16T00:00:00
en
Supplementary Publication Series of Datasets
10.1029/95PA00332
3 datasets
application/zip
Creative Commons Attribution 3.0 Unported
Benthic foraminiferal delta13C data from site 502 in the Caribbean Sea (sill depth ?1800 m) indicate that throughout the past 2.6 m.y., glacial delta13C values in the middepth Atlantic were higher during glaciations than interglaciations. This is interpreted as indicating a greater proportion of Upper North Atlantic Deep Water (UNADW) relative to southern source waters during glaciations. The contribution of UNADW during interglaciations to the middepth Atlantic remained approximately constant, and the contribution during glaciations may have been as much as 10 % higher in the late Pleistocene than in the late Pliocene. This small increase is in striking contrast to the much larger decrease in glacial Lower North Atlantic Deep Water (LNADW) contribution relative to southern sources, from about 80% to about 20%, that occurred over the past 2.6 m.y. Glacial intensification over the past 2.6 m.y. was probably coupled with a decrease in northward heat transport by the upper limb of the North Atlantic circulation cell, as was previously suggested on the basis of a LNADW record alone. Late Pleistocene (1 Ma-present) delta13C values in the Caribbean Sea were approximately 0.2 per mil higher than they were from 2.6 to 2.0 Ma. The delta13C rise is not due to an increase in the mean ocean delta13C value, nor can it be entirely attributed to an increase in the proportion of high-delta13C source waters. An increase in the delta13C value of the surface source waters must have contributed to the delta13C rise.
Supplement to: Oppo, Delia W; Raymo, Maureen E; Lohmann, Gerrit; Mix, Alan C; Wright, James D; Prell, Warren L (1995): A d13C record of Upper North Atlantic Deep Water during the past 2.6 million years. Paleoceanography, 10(3), 373-394
-79.37879999999998
11.491099999999998
Caribbean Sea/RIDGE