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Schefuß, Enno; Sinninghe Damsté, Jaap S; Jansen, J H Fred (2004): Tropical Atlantic SST during the mid-Pleistocene transition (MPT) of ODP Hole 175-1077B. PANGAEA, https://doi.org/10.1594/PANGAEA.327242, Supplement to: Schefuß, E et al. (2004): Forcing of tropical Atlantic sea surface temperatures during the mid-Pleistocene transition. Paleoceanography, 19, PA4029, https://doi.org/10.1029/2003PA000892

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Abstract:
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.
Coverage:
Latitude: -5.179940 * Longitude: 10.436360
Date/Time Start: 1997-08-30T11:30:00 * Date/Time End: 1997-08-31T04:55:00
Minimum DEPTH, sediment/rock: 62.77 m * Maximum DEPTH, sediment/rock: 150.31 m
Event(s):
175-1077B * Latitude: -5.179940 * Longitude: 10.436360 * Date/Time Start: 1997-08-30T11:30:00 * Date/Time End: 1997-08-31T04:55:00 * Elevation: -2381.4 m * Penetration: 205.1 m * Recovery: 211.45 m * Location: Benguela Current, South Atlantic Ocean * Campaign: Leg175 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 22 cores; 205.1 m cored; 0 m drilled; 103.1 % recovery
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1DEPTH, sediment/rockDepthmGeocode
2AGEAgeka BPGeocode
3Depth, compositeDepth compmcdSchefuß, EnnoIntercore correlation
4Sample code/labelSample labelSchefuß, EnnoODP sample designation
5Alkenone, unsaturation index UK'37UK'37Schefuß, EnnoCalculated from C37 alkenones (Prahl & Wakeham, 1987)
6Sea surface temperature, annual meanSST (1-12)°CSchefuß, EnnoCalculated from C37 alkenones (Brassell et al., 1986)
Size:
856 data points

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