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

该项目将在MIS 2和MIS 3期间（重点关注Dansgaard Oeschger （D-O）振荡）提供亚轨道时间尺度上通过印度尼西亚门户的低盐度温水流量的定量估计，并将评估印度尼西亚通流（ITF）对东印度洋水文和全球热盐环流在这一气候高变率关键区间的影响。与海平面变化、西太平洋暖池温度和盐度变化相关的ITF波动强烈影响澳大利亚上空的降水、东南亚夏季风的强度以及印度洋温暖经向流的强度。我们将检验ITF的增加与MIS 3的温暖间冰期有关的假设，而在间冰期ITF的强烈减少发生。我们将使用浮游生物和底栖有孔虫同位素作为主要代用品，结合Mg/Ca温度估计和放射性成因同位素（主要是Nd）作为帝汶通道和东印度洋深度样带的太平洋水团的示踪剂。该项目将提供古海洋学框架，这对于验证和改进全球范围内的D-O事件和高频气候变率的环流模式至关重要。

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.