Impact of Low Latitude Gateway on the Formation of Warm Water Pools, Ocean Circulation and Climate

该主题侧重于中新世至上新世低纬度海洋通道的关闭及其对海洋环流和气候变化的影响。我们计划研究（1）巴拿马地峡开放和封闭（7.5-4.0 Ma）的情景及其对西大西洋暖池和已经存在的西太平洋暖池形成的影响;（2）印度尼西亚门户的收缩及其对西太平洋暖池（20-6 Ma）形成的影响。结合有孔虫Mg/Ca温度重建，对浅层和深层生活的南极有孔虫的稳定同位素研究将提供有关温跃层深度的信息。其他代理数据...将反映海洋生产力的变化，从而反映地表环流模式的变化。利用底栖氧同位素，我们打算将同位素地层学扩展到中新世。底栖碳同位素将有助于重建深水通风的变化，深水形成的变化和亚热带网关的岩床深度的变化所引发的。

The theme focusses on the Miocene to Pliocene closure of low-latitude oceanic passages and their impact on changes in ocean circulation and climate... We plan to examine (1) the scenarios of an open and closed Isthmus of Panama (7.5-4.0 Ma) and their effects on the formation of the W-Atlantic Warm Pool and an already existing W-Pacific Warm Pool, and (2) the constriction of the Indonesian Gateway and its effect on the formation of the W-Pacific Warm Pool (20-6 Ma). Stable isotope studies on shallow and deep-dwelling planktic foraminifers in conjunction with foraminiferal Mg/Ca temperature reconstructions will provide information about the thermocline depth... Other proxy data ... will reflect changes in marine productivity and hence, changes in surface circulation patterns. With benthic oxygen isotopes we intend to expand the isotope stratigraphy into the Miocene. Benthic carbon isotopes will help to reconstruct changes in deep-water ventilation that are triggered by changes of deep water formation and by changes in the sill depths of subtropical gateways...