晚中新世以来印度洋-太平洋暖池水体交换过程及其气候效应

以印尼海道和/或印尼穿越流（ITF）桥接的印度洋-太平洋暖池之间的水体交换不仅控制印-太热带海区的物质、热量和淡水收支，也通过反馈和遥相关影响高纬海区，因而在调控区域和全球气候中功不可没。然而，对于印-太暖池水体交换及其气候效应的演化研究很不系统，尤其体现在构造尺度和长期趋势上。项目以IODP 363航次在印尼海道两侧钻取的5个站位为材料，运用微体古生物学和地球化学技术（有孔虫δ13C、δ18O、Mg/Ca和εNd等）重建8.5 Ma以来西太暖池和印度洋暖池上-中-深层古海洋环境。在对比分析西太暖池和印度洋暖池全水层古海洋环境异同的基础上，查明印尼海道和/或ITF的演化历史并再造印-太暖池水体交换的全水层演化过程。最后，将印尼海道和/或ITF的演化与暖池的演化、ENSO式变化以及北半球大冰期记录对比，揭示印-太暖池水体交换对热带和高纬气候的调控机制，明确其在区域和全球气候演化中的重要地位。

Water exchange between western Pacific warm pool and Indian warm pool, operated by Indonesian seaway and/or Indonesian throughflow (ITF), not only control the budgets of material, heat and fresh water in tropical Indo-Pacific area but also influence high- latitude sea area by feedback and teleconnection, thus playing a key role in the regional and global climate changes. However, there is a lack of systematic study on the evolution of water exchange between Indian-Pacific warm pool and its climate effects, especially in the context of the tectonic scale and long-term trend. In this project, paleoceanographic and paleoenvironmental changes in the upper-intermediate-deep waters of western Pacific warm pool and Indian warm pool are reconstructed over the past 8.5 Ma, by applying micropaleontological and geochemical proxies (e.g., foraminiferal δ13C, δ18O, Mg/Ca and εNd) to sediment cores from five sites recovered by International Ocean Discovery Program (IODP) 363 expedition in the two-side area around Indonesian seaway. Furthermore, historical evolutions on Indonesian seaway and/or ITF and thus whole-depth water exchange process between Indian-Pacific warm pool are ascertained, based on the whole-depth paleoceanographic and paleoenvironmental comparisons of western Pacific warm pool with Indian warm pool. Finally, we exploit the modulation mechanism of water exchange between Indian-Pacific warm pool on tropical and high-latitude climate and demonstrate its significances in regional and global climate changes, by correlating the evolution of Indonesian seaway and/or ITF to warm pool evolution, El Niño-Southern Oscillation (ENSO)-like process and Northern Hemisphere Glaciation (NHG)-related records.