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

低纬度门户对暖水池形成、海洋环流和气候的影响

• 批准号: 5345078
• 负责人: Professor Dr. Ralf Tiedemann
• 金额: --
• 依托单位: Alfred-Wegener-Institut (AWI) Helmholtz-Zentrum für Polar- und Meeresforschung
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2001
• 资助国家: 德国
• 起止时间: 2000-12-31 至 2008-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5345078?language=en
• 关键词: Impact; Low; Latitude; Gateway; Formation

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...

主题集中在中新世至上新世低纬海洋航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)巴拿马地峡开放和关闭(7.5-4.0 Ma)的情景及其对西大西洋暖池和已有的西太平洋暖池形成的影响；(2)印度尼西亚门的收缩及其对西太平洋暖池(20-6 Ma)形成的影响。浅水和深水浮游有孔虫的稳定同位素研究结合有孔虫的镁/钙有孔虫温度重建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。利用海底氧同位素，我们打算将同位素地层学扩大到中新世。海底碳同位素将有助于重建深水通风的变化，这些变化是由深水形成的变化和亚热带门户的基床深度变化所触发的……