Authigenic uranium, mass accumulation rates, benthic δ¹³C and SST during the last interglacial period of ODP Site 177-1094

Southern Ocean sediments reveal a spike in authigenic uranium 127,000 years ago, within the last interglacial, reflecting decreased oxygenation of deep water by Antarctic Bottom Water (AABW). Unlike ice age reductions in AABW, the interglacial stagnation event appears decoupled from open ocean condi...

Full description

Bibliographic Details
Main Authors: Hayes, Christopher T, Martínez‐García, Alfredo, Hasenfratz, Albin, Jaccard, Samuel L, Hodell, David A, Sigman, Daniel M, Haug, Gerald H, Anderson, Robert F
Format: Dataset
Language:English
Published: PANGAEA 2014
Subjects:
177-1094
COMPCORE
Composite Core
Joides Resolution
Leg177
Ocean Drilling Program
ODP
South Atlantic Ocean
Antarctic
Southern Ocean
The Antarctic
Antarc*
Ice Sheet
NADW
North Atlantic Deep Water
North Atlantic
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.839454
https://doi.org/10.1594/PANGAEA.839454
Description
Summary:Southern Ocean sediments reveal a spike in authigenic uranium 127,000 years ago, within the last interglacial, reflecting decreased oxygenation of deep water by Antarctic Bottom Water (AABW). Unlike ice age reductions in AABW, the interglacial stagnation event appears decoupled from open ocean conditions and may have resulted from coastal freshening due to mass loss from the Antarctic ice sheet. AABW reduction coincided with increased North Atlantic Deep Water (NADW) formation, and the subsequent reinvigoration in AABW coincided with reduced NADW formation. Thus, alternation of deep water formation between the Antarctic and the North Atlantic, believed to characterize ice ages, apparently also occurs in warm climates.

Similar Items