Indonesian Throughflow variability on sub-orbital timescales during Marine Isotopes Stages (MIS) 2 and 3

该项目将在管理信息系统2和3期间在亚轨道时间尺度上提供低盐度暖水流经印度尼西亚网关的定量估计(重点是丹斯加德·奥施格(D-O)振荡)，并将评估印度尼西亚贯穿流S在这一气候高度多变性的关键时段对东印度洋水文地理学和全球温盐环流的影响。与海平面变化、西太平洋暖池(WPWP)的温度和盐度变化有关的ITF波动强烈地影响着澳大利亚的降水、东南亚夏季风的强度和印度洋经向暖流的强度。我们将检验这一假设，即ITF的增加与MIS3的温热间期有关，而ITF的强烈降低发生在主场期间。我们将使用浮游和底栖有孔虫同位素作为主要的替代指标，结合镁/钙温度估计和放射性同位素(主要是ND)，作为沿东帝汶海峡和东印度洋深度横断面的太平洋水团的示踪剂。该项目将提供古海洋学框架，这将对验证和完善全球范围内D-O事件和高频气候变率的环流模型至关重要。

This project will provide quantitative estimates of the flow of low-salinity warm water through the Indonesian Gateway on suborbital timescales during MIS 2 and 3 (focusing on Dansgaard Oeschger (D-O) oscillations) and will assess the Indonesian Throughflow (ITF) s impact on the hydrography of the eastern Indian Ocean and global thermohaline circulation during this critical interval of high climate variability. ITF fluctuations, associated with sea level change, temperature and salinity variations in the West Pacific Warm Pool (WPWP) strongly influence precipitation over Australia, the strength of the southeast-Asian summer monsoon, and the intensity of warm meridional currents in the Indian Ocean. We will test the hypothesis that increased ITF is associated with warm interstadials of MIS 3, whereas a strong reduction in ITF occurred during stadials. We will use as main proxies planktonic and benthic foraminiferal isotopes in conjunction with Mg/Ca temperature estimates and radiogenic isotopes (mainly Nd) as tracers of Pacific water masses along depth transects in the Timor Passage and the eastern Indian Ocean. This project will provide the paleoceanographic framework that will be crucial to validate and refine circulation models of D-O events and high-frequency climate variability on a global scale.