Paleoceanographic Evolution of the Subantarctic South-East Atlantic: A Site Survey Proposal for the Ocean Drilling Program

佛罗里达大学、佐治亚理工学院、圣地亚哥加利福尼亚大学斯克里普斯研究所和哥伦比亚大学拉蒙特-多尔蒂地球观测站的研究人员参与了这个亚南极海洋的合作实地项目。计划于1996年初进行的研究巡航的目的是取样在南极海洋各水团内沉积的沉积物，以便研究过去几十万年来气候和海洋学的变化。南极地区对全球海洋学有重大影响，因为世界海洋的许多中层和底水是在这里形成的，因此海洋的热量和化学收支在许多方面取决于这里的气候和海洋学的变化。这些变化的记录记录在沉积物中保存的微化石中，这组研究人员将从该地区所有主要的中深水块中取样沉积物。他们的研究将包括对回收的沉积物进行动物、化学和孔隙水分析，以构建在过去两到三个冰期循环中大量参数变化的年表（直到他们的活塞芯到达）。此外，他们收集的数据将用于在1997年或1998年根据JOIDES决议确定钻探的合适地点，这些地点已被列为海洋钻探计划的一部分，该计划是由美国国家科学基金会主要赞助的国际科学海洋钻探计划。虽然目前被认为是高度优先的钻探地点，但这些南极地点目前没有足够的现场调查信息来确定精确的孔位，而这个项目将提供那些必要的地球物理和沉积学数据。＊＊＊

9505528 Froelich This collaborative field program in the sub-Antarctic ocean involves researchers from University of Florida, Georgia Tech, Scripps Institution of the University of California at San Diego and Lamont-Doherty Earth Observatory of Columbia University. The objectives of the research cruise planned for early 1996 are to sample sediments deposited within various water masses of the Antarctic ocean for studies of climatic and oceanographic variations over the past few hundred thousand years. The Antarctic region has a major influence on global oceanography, for it is here that many of the intermediate and bottom waters of the world ocean are formed, and thus the heat and chemical budgets of the ocean are dependent in a number of ways on changes in climate and oceanography here. The record of these variations is recorded in microfossils preserved in the sediments, and this group of investigators will sample sediments from all of the major intermediate and deep water masses of the region. Their research will include faunal, chemical and pore water analysis of the sediments recovered to construct chronologies of change in a large number of parameters throughout the last two or three glacial cycles (as far as their piston cores will reach). In addition, the data they collect will be used to define suitable sites for drilling by JOIDES Resolution in 1997 or 1998 at sites which have been highly ranked as part of the Ocean Drilling Program, the international program for scientific ocean drilling of which NSF is a major sponsor. Though presently considered a high drilling priority, these Antarctic sites do not presently have sufficient site survey information to allow precise hole locations, and this project will provide those necessary geophysical and sedimentological data. ***