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Cortese, Giuseppe; Abelmann, Andrea; Gersonde, Rainer (2007): Summer sea surface temperatures calculated from radiolaria at ODP Site 177-1089 in the subantarctic Atlantic. PANGAEA,, Supplement to: Cortese, G et al. (2007): The last five glacial-interglacial transitions: A high-resolution 450,000-year record from the subantarctic Atlantic. Paleoceanography, 22(4), PA4203,

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A submillennial resolution, radiolarian-based record of summer sea surface temperature (SST) documents the last five glacial to interglacial transitions at the subtropical front, southern Atlantic Ocean. Rapid fluctuations occur both during glacial and interglacial intervals, and sudden cooling episodes at glacial terminations are recurrent. Surface hydrography and global ice volume proxies from the same core suggest that summer SST increases prior to terminations lead global ice-volume decreases by 4.7 ± 3.7 ka (in the eccentricity band), 6.9 ± 2.5 ka (obliquity), and 2.7 ± 0.9 ka (precession). A comparison between SST and benthic delta13C suggests a decoupling in the response of northern subantarctic surface, intermediate, and deep water masses to cold events in the North Atlantic. The matching features between our SST record and the one from core MD97-2120 (southwest Pacific) suggests that the super-regional expression of climatic events is substantially affected by a single climatic agent: the Subtropical Front, amplifier and vehicle for the transfer of climatic change. The direct correlation between warmer DeltaTsite at Vostok and warmer SST at ODP Site 1089 suggests that warmer oceanic/atmospheric conditions imply a more southward placed frontal system, weaker gradients, and therefore stronger Agulhas input to the Atlantic Ocean.
Latitude: -40.936333 * Longitude: 9.893983
Date/Time Start: 1997-12-19T00:00:00 * Date/Time End: 1997-12-19T00:00:00
Minimum DEPTH, sediment/rock: 0.03 m * Maximum DEPTH, sediment/rock: 67.57 m
177-1089 * Latitude: -40.936333 * Longitude: 9.893983 * Date/Time: 1997-12-19T00:00:00 * Elevation: -4620.5 m * Penetration: 793.6 m * Recovery: 675.9 m * Location: South Atlantic Ocean * Campaign: Leg177 * Basis: Joides Resolution * Device: Composite Core (COMPCORE) * Comment: 86 cores; 791.6 m cored; 2 m drilled; 85.4% recovery
Core PS2821-1 and the composite section of ODP Site 177-1089 were correlated by color reflectance, magnetic susceptibility and Cycladophora davisiana relative abundance changes records
#NameShort NameUnitPrincipal InvestigatorMethodComment
1AGEAgeka BPGeocode
2DEPTH, sediment/rockDepthmGeocode
3Sea surface temperature, summerSST sum°CCortese, GiuseppeTransfer function (Imbrie & Kipp, 1971, in Turekian, Yale Univ Press)
477 data points

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