LEG 177 SOUTHERN OCEAN PALEOCEANOGRAPHY Modified by D. Hodell and R. Gersonde from Proposal 464 Submitted by:

• Main Authors: R. Gersonde, D. Hodell, G. Bohrmann, C. Charles, P. Froelich, D. Fütterer, K. Gohl, G. Kuhn, H. Miller, D. Warnke, Staff Scientist, Peter Blum, Co-chief Scientists, Rainer Gersonde, David Hodell
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Antarctic; Greenland; Southern Ocean; The Antarctic; Antarc*; Antarctica
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.411.2280; http://www-odp.tamu.edu/publications/tnotes/tn20-5/177.pdf

Leg 177 will core sediments in the southeast Atlantic sector of the Southern Ocean to study the paleoceanographic history of the Antarctic region on short (millennial) to long (Cenozoic) time scales. Six primary sites are located along a latitudinal transect across the Antarctic Circumpolar Current (ACC) from 41 ° to 53°S, including two sites (TSO-6A/B, TSO-7C/B) within the circum-Antarctic siliceous belt. The sites are also arranged along a bathymetric transect ranging from 2100 to 4600 m water depths, intersecting all of the major deep and bottom water masses in the Southern Ocean. The general goals of Leg 177 are two-fold: (1) to augment the biostratigraphic, biogeographic, and paleoceanographic history of the earlier Cenozoic, a period marked by the establishment of the Antarctic cryosphere and the ACC; and (2) to target expanded sections of late Neogene sediments that will resolve the timing of Southern Hemisphere climatic events on orbital and suborbital time scales, which can be compared with similar records from other ocean basins and with ice cores from Greenland and Antarctica. Drilling the proposed sites will provide the sedimentary sequences needed to address a number of first-order problems in southern highlatitude