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

海洋同位素阶段 (MIS) 2 和 3 期间印度尼西亚亚轨道时间尺度的通流变化

基本信息

批准号：
21278685
负责人：
Professor Dr. Wolfgang Kuhnt
金额：
--
依托单位：
Forschungseinheit Paläo-Ozeanographie
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2006
资助国家：
德国
起止时间：
2005-12-31 至 2010-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/21278685?language=en
关键词：
Indonesian Throughflow variability sub orbital

项目摘要

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.

该项目将提供MIS 2和3期间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（重点是Dansgaard Oeschger（D-O）振荡），并将评估印度尼西亚贯穿流（ITF）对印度尼西亚的影响在这个高气候变化的关键间隔期间，东印度洋和全球温盐环流的水文。ITF波动与海平面变化、西太平洋暖池（WPWP）的温度和盐度变化相关，强烈影响澳大利亚的降水、东南亚夏季风的强度以及印度洋暖纬向流的强度。我们将测试的假设，增加ITF是与温暖interstadials的MIS 3，而强烈减少ITF发生在stadials。我们将使用作为主要代理的浮游生物和底栖有孔虫同位素结合Mg/Ca温度估计和放射性同位素（主要是Nd）作为示踪剂的太平洋水团沿着深度断面在帝汶海峡和东印度洋。该项目将提供古海洋学框架，这对于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。