Tropical Atlantic SST during the mid-Pleistocene transition (MPT) of ODP Hole 175-1077B, supplement to: Schefuß, Enno; Sinninghe Damsté, Jaap S; Jansen, J H Fred (2004): Forcing of tropical Atlantic sea surface temperatures during the mid-Pleistocene transition. Paleoceanography, 19, PA4029


We compare a new mid-Pleistocene sea surface temperature (SST) record from the eastern tropical Atlantic to changes in continental ice volume, orbital insolation, Atlantic deepwater ventilation, and Southern Ocean front positions to resolve forcing mechanisms of tropical Atlantic SST during the mid-Pleistocene transition (MPT). At the onset of the MPT, a strong tropical cooling occurred. The change from a obliquity- to a eccentricity-dominated cyclicity in the tropical SST took place at about 650 kyr BP. In orbital cycles, tropical SST changes significantly preceded continental ice-volume changes but were in phase with movements of Southern Ocean fronts. After the onset of large-amplitude 100-kyr variations, additional late glacial warming in the eastern tropical Atlantic was caused by enhanced return flow of warm waters from the western Atlantic driven by strong trade winds. Pronounced 80-kyr variations in tropical SST occurred during the MPT, in phase with and likely directly forced by transitional continental ice-volume variations. During the MPT, a prominent anomalous long-term tropical warming occurred, likely generated by extremely northward displaced Southern Ocean fronts. While the overall pattern of global climate variability during the MPT was determined by changes in mean state and frequency of continental ice volume variations, tropical Atlantic SST variations were primarily driven by early changes in Subantarctic sea-ice extent and coupled Southern Ocean frontal positions.

Related Identifier
Metadata Access
Creator Schefuß, Enno; Sinninghe Damsté, Jaap S; Jansen, J H Fred
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 2004
Rights Creative Commons Attribution 3.0 Unported
OpenAccess true
Language English
Resource Type Supplementary Dataset
Format text/tab-separated-values
Size 856 data points
Discipline Earth System Research
Spatial Coverage (10.436 LON, -5.180 LAT); Benguela Current, South Atlantic Ocean
Temporal Coverage Begin 1997-08-30T11:30:00Z
Temporal Coverage End 1997-08-31T04:55:00Z