Banda Sea and the Indonesian Throughflow variability during the past 700,000 years

过去 70 万年的班达海和印度尼西亚贯流变化

• 批准号: 446964017
• 负责人: Privatdozent Dr. Mahyar Mohtadi Hamadani
• 金额: --
• 依托单位: Zentrum für Marine Umweltwissenschaften (MARUM)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2021
• 资助国家: 德国
• 起止时间: 2020-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/446964017?language=en
• 关键词: Banda; Sea; Indonesian; Throughflow; variability

The Banda Sea is a critical basin in mixing and modifying of the subsurface water masses entering the Indian Ocean from the Pacific Ocean, called the Indonesian Throughflow (ITF). Mixing of the relatively saltier South Pacific and fresher North Pacific source waters of the ITF takes place here, where the depth and temperature of the thermocline are capable of generating large atmospheric feedbacks and rainfall anomalies. However, the contribution of South Pacific water masses to the ITF is unknown due to the lack of instrumental records and proxy-based reconstructions from the Banda Sea. We propose for funding to reconstruct 700,000 years of surface and thermocline conditions from shell Mg/Ca and oxygen isotopes of two planktic foraminifera species from a marine core in the Banda Sea. By reconstructing the upper water conditions in the Banda Sea from multi-centennial to orbital timescales and under different climate boundary conditions, we will elucidate the relative contributions of the different source waters to the ITF, their relation to sea-level changes, and to convection and rainfall over Indonesia.

班达海是从太平洋进入印度洋的地下水团混合和改变的关键盆地，被称为印尼贯流(ITF)。ITF的较咸的南太平洋和较新鲜的北太平洋源水在这里混合，温跃层的深度和温度能够产生大量的大气反馈和降雨异常。然而，南太平洋水团对ITF的贡献是未知的，因为缺乏仪器记录和来自班达海的基于代理的重建。我们建议提供资金，从班达海一个海洋核心的两个浮游有孔虫物种的贝壳镁/钙和氧同位素重建70万年的表面和温跃层条件。通过重建班达海从百年到轨道时间尺度和不同气候边界条件下的上层水条件，我们将阐明不同来源的水对ITF的相对贡献，它们与海平面变化的关系，以及与印度尼西亚对流和降水的关系。