Collaborative Research: Ice-Age and Millennial-Scale Changes of Pacific Intermediate Waters: Ventilation from the Southern Ocean

推荐的提案是为赤道东部和亚热带太平洋的海洋地质野外项目，研究晚更新世在千年时间尺度上的垂直水团分布。拟议工作的目的是：1)作为支持JOIDES ODP提案465/ADD的取心和地球物理数据的现场调查，该提案目前被JOIDES SCICOM高度评价，很有可能在2001年或2002年钻探；2)记录获得的沉积物岩心，用于赤道东太平洋千年尺度气候和海洋变率的研究；3)验证了太平洋盆地中间水的间歇通气是由南极中间水流动加剧引起的假说。中间水的性质将用底栖有孔虫种类和同位素数据进行检验。通过检查与中间水域相关的气候事件的时间和空间分布，将评估这些变化是由南半球还是北半球驱动的

99-06778 Pisias99-07292 LyleThe recommended proposal is for a marine geological field program in the eastern equatorial and subtropical Pacific to study vertical water mass distributions during the late Pleistocene on millennial time scales. The object of the proposed work is to: 1) serve as a site survey for both coring and geophysical data in support of the JOIDES ODP Proposal 465/ADD, currently highly ranked by the JOIDES SCICOM with a strong likelihood of drilling in the year 2001 or 2002; 2) document the acquired sediment cores for investigations of millennial-scale climate and ocean variability in the eastern equatorial Pacific; and 3) test the hypothesis that episodic ventilation of the intermediate waters of the Pacific Basin results from intensified flow of Antarctic Intermediate Water. Intermediate water properties will be examined with benthic foraminiferal species and isotopic data. By examining the timing and spatial distribution of climate events associated with intermediate waters, it will be assessed whether such changes are driven from the Southern or Northern Hemispheres.***