Combined application of new proxies (231Pa/230Th and Nd isotopes) to reconstruct the deep ocean overturning over the last 30,000 years.

联合应用新代理（231Pa/230Th 和 Nd 同位素）来重建过去 30,000 年来的深海翻转。

• 批准号: 159214802
• 负责人: Dr. Jörg Lippold
• 金额: --
• 依托单位: Institut für Geowissenschaften
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/159214802?language=en
• 关键词: Combined; application; new; proxies; 231Pa

The Atlantic Meridional Overturning Circulation holds a key role in the climatic system of our planet as it controls the transport of global heat and CO2. In order to estimate or model its future evolution it is crucial to reconstruct the strength of the North Atlantic Deep Water Export in past major climatic transitions such as during the last deglaciation. Regarding the recent stability of the Atlantic circulation the triggers of short-time but extreme cold events during the last termination are of high interest. In contrast to the modern situation, several proxies point to a very different structure of water mass distribution during the Last Glacial. However, there is still no consensus about the variations of the circulation strength or the timing of the major changes. Protactinium, thorium, and neodymium isotopes, extracted from marine sediments, are promising novel proxies to reconstruct the past Deep Ocean hydrography and water mass export. The first time combined application of these tracers on the same sediment samples from the West Atlantic will vitally improve the understanding of both isotopic systems as well as our knowledge about the past Ocean Circulation. Ideally, one proxy will yield information about the rate of overturning circulation, whereas the other proxy carries a water mass provenance signal.

大西洋经向翻转环流在我们星球的气候系统中起着关键作用，因为它控制着全球热量和二氧化碳的输送。为了估计或模拟其未来的演变，至关重要的是重建北大西洋深水输出在过去的主要气候转变，如在最后一次冰消期的强度。关于最近大西洋环流的稳定性，最近一次终止期间短时间但极端寒冷事件的触发因素引起了高度关注。与现代情况相反，几个代理点在末次冰期的水团分布的一个非常不同的结构。然而，对于环流强度的变化或主要变化的时间仍然没有达成共识。从海洋沉积物中提取的钚、钍和钕同位素是重建过去深海水文和水团输出的有前途的新替代物。首次将这些示踪剂联合应用于西大西洋的相同沉积物样品，将极大地提高对这两种同位素系统的理解以及我们对过去海洋环流的了解。理想情况下，一个代理将产生关于翻转环流速率的信息，而另一个代理携带水团来源信号。

项目成果

Strength and geometry of the glacial Atlantic Meridional Overturning Circulation

冰川大西洋经向翻转环流的强度和几何形状

• DOI: 10.1038/ngeo1608
• 发表时间: 2012
• 期刊: Nature Geoscience
• 影响因子: 18.3
• 作者: Lippold;Y. Luo;R. Francois;S. Allen;J. Gherardi;S. Pichat;B. Hickey;H. Schulz
• 通讯作者: H. Schulz

Boundary scavenging at the East Atlantic margin does not negate use of 231Pa/230Th to trace Atlantic overturning

东大西洋边缘的边界清除并不否定使用 231Pa/230Th 来追踪大西洋翻转

• DOI: 10.1016/j.epsl.2012.04.005
• 发表时间: 2012
• 期刊: Earth and Planetary Science Letters
• 影响因子: 5.3
• 作者: Lippold;S. Mulitza;G. Mollenhauer;D. Heslop;S. Weyer;M. Christl
• 通讯作者: M. Christl

Sahel megadrought during Heinrich Stadial 1: evidence for a three-phase evolution of the low- and mid-level West African wind system

Heinrich Stadial 1 期间的萨赫勒特大干旱：西非低层和中层风系统三相演化的证据

• DOI: 10.1016/j.quascirev.2012.10.015
• 发表时间: 2012
• 期刊: Quaternary Science Reviews
• 影响因子: 4
• 作者: Bouimetarhan;M. Prange;E. Schefuß;L. Dupont;J. Lippold;S. Mulitza;K. Zonneveld
• 通讯作者: K. Zonneveld