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CryptoTEPHrochronology in the ICDP Dead Sea deep core as a key to synchronise past hydroclimate changes in the eastern MEditerranean (TEPH-ME)

ICDP 死海深部核心的 CryptoTEPH 年代学是同步地中海东部过去水文气候变化的关键 (TEPH-ME)

基本信息

批准号：
419912492
负责人：
Dr. Ina Neugebauer
金额：
--
依托单位：
Sektion 4.3: Klimadynamik und Landschaftsentwicklung
依托单位国家：
德国
项目类别：
Infrastructure Priority Programmes
财政年份：
2019
资助国家：
德国
起止时间：
2018-12-31 至 2019-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/419912492?language=en
关键词：
CryptoTEPHrochronology ICDP Dead Sea deep

项目摘要

In the drought-affected eastern Mediterranean region, a better understanding of the past hydroclimate variability is a prerequisite to improve our capability to estimate future changes of the water balance in this climatically sensitive region. Tephrochronology, i.e. identifying volcanic ash (tephra) of past volcanic eruptions in lacustrine and marine sediment records and using them as time-parallel markers, is the ideal method to achieve unambiguous synchronization of these palaeoclimate records. The main aim of the TEPH-ME project is to link palaeoenvironmental records from the eastern Mediterranean region by tephra time-markers to determine the regionally different hydroclimatic responses to past climate change. To achieve this aim, widespread and well-dated Mediterranean cryptotephras are aimed to be identified, for the first time, in the deep ICDP sediment cores from the Dead Sea, and hence from a key palaeoclimate archive of the south-eastern Mediterranean-Levantine region. Identifying such tephras from central and eastern Mediterranean volcanic provinces in the sediment cores of the Dead Sea will allow extending the Mediterranean tephrostratigraphical framework further to the southeast. Moreover, this will enable improving the current chronology of the ICDP Dead Sea palaeoclimate record that is only poorly constrained so far. Synchronising palaeoclimate proxy-data from the Dead Sea with other long and high-resolution Mediterranean climate records that are, so far, connected to the tephra framework of this region, will allow inferring the natural hydroclimatic response to past climate changes across the eastern Mediterranean including potential lead- and lag-phase relationships and seesaw patterns. Particular focus will be set on the last interglacial period (marine isotope stage - MIS 5e), including its terminations from the penultimate glaciation (MIS 6), and to the early last glacial (MIS 5d-a). This time-window is of major interest to the palaeoclimate community, as it serves as possible analogue to the projected future climate change. Furthermore, it is important to better understand palaeohydrological changes in the southern Levant and its significance as migration corridor for early modern humans leaving Africa during the last glacial-interglacial cycle.

在受干旱影响的东地中海地区，更好地了解过去的水文气候变化是提高我们估计这一气候敏感地区未来水平衡变化的能力的先决条件。火山灰年代学，即在湖泊和海洋沉积物记录中识别过去火山爆发的火山灰（火山灰），并将其用作时间平行标记，是实现这些古气候记录明确同步的理想方法。TEPH-ME项目的主要目的是通过火山喷发时间标记将东地中海区域的古环境记录联系起来，以确定区域不同的水文气候对过去气候变化的反应。为了实现这一目标，广泛和良好的地中海cryptotephras的目的是确定，第一次，在深ICDP沉积岩芯从死海，因此从东南地中海-黎凡特地区的一个关键的古气候档案。确定这样的火山灰从中部和东部地中海火山省的沉积物中的核心死海将允许扩展地中海火山灰地层框架进一步向东南。此外，这将有助于改善目前的ICDP死海古气候记录的年表，到目前为止，只有很好的限制。同步古气候代理数据从死海与其他长期和高分辨率的地中海气候记录，到目前为止，连接到该地区的火山灰框架，将允许推断自然水文气候响应过去的气候变化在整个地中海东部，包括潜在的铅和滞后阶段的关系和跷跷板模式。将特别关注末次间冰期（海洋同位素阶段- MIS 5e），包括其从倒数第二次冰期（MIS 6）到末次冰期早期（MIS 5d-a）的终止。这一时间窗是古气候界的主要兴趣，因为它可以作为预测未来气候变化的模拟。此外，重要的是要更好地了解在南部黎凡特的古水文变化及其意义的迁移走廊早期现代人类离开非洲在最后一次冰期-间冰期周期。