Nuernberg, Dirk; Brughmans, Natasja; Schoenfeld, Joachim; Ninnemann, Ulysses; Dullo, Christian (2004): Paleo-export production, terrigenous flux and sea surface temperatures around Tasmania; implications for glacial/interglacial changes in the Subtropical Convergence Zone. American Geophysical Union, Washington, DC, United States, In: Exon, Neville F. (editor), Kennett, James P. (editor), Malone, Mitchell (editor), The Cenozoic Southern Ocean; tectonics, sedimentation, and climate change between Australia and Antarctica, 151, 291-318, georefid:2005-035036

Abstract:
The Tasmanian Gateway, focus of ODP Leg 189, is a key oceanographic area within the Southern Ocean. Our investigations concentrate on the last 500,000 years of sedimentation at Sites 1168 (western Tasmanian margin), 1170 and 1171 (Tasman Rise), and 1172 (East Tasman Plateau). A suite of geochemical proxy data reflecting paleo-export production, terrigenous flux, and sea surface temperature, constrain temporal and spatial variations in surface water masses and oceanographic frontal systems over these sites. Interglacial periods were commonly of low productivity and less affected by terrigenous matter supply, suggesting that the position of the Subtropical Convergence remained south of Tasman Rise. Only during early MIS 11 and MIS 9 over the southern Tasman Rise, and during MIS 7 over the northern Tasman Rise, did enhanced marine productivity, combined with an enhanced terrigenous flux, indicate waxing influence of subantarctic waters. During glacial MIS 2, marine productivity and terrigenous flux increased significantly at Sites 1168, 1170, and 1171 implying that the Subtropical Convergence moved northward to west of Tasmania. (modif. j. abstr.)
Coverage:
West: 144.2400 East: 149.5600 North: -42.3600 South: -48.3000
Relations:
Expedition: 189
Site: 189-1168
Site: 189-1170
Site: 189-1171
Site: 189-1172
Data access:
Provider: SEDIS Publication Catalogue
Data set link: http://sedis.iodp.org/pub-catalogue/index.php?id=2005-035036 (c.f. for more detailed metadata)
This metadata in ISO19139 XML format