Impact of global warming during the penultimate termination on regional hydroclimates in the Dead Sea and Lake Van

倒数第二次终止期间全球变暖对死海和凡湖区域水文气候的影响

• 批准号: 517384910
• 负责人: Professor Dr. Achim Brauer
• 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
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/517384910?language=en
• 关键词: Impact; global; warming; during; penultimate

The Mediterranean region is highly sensitive to the current global warming, which has a strong influence on the hydroclimate and the occurrence of extreme weather events. However, lake level reconstructions from the Dead Sea and Lake Van reveal contrasting rainfall variability due to past global climatic changes. Yet local responses during warming climates are still not understood. We aim here to provide a detailed and integrated comparison between these two locations during the transition from the penultimate glaciation to the last interglacial, which was the warmest interglacial of the last 800 kyr. The laminated lacustrine sediments of the long Dead Sea ICDP drilling Site 5017-1 and Lake Van drilling Site 5034-1 (Ahlat Ridge) provide unique archives to study the impact of global warming on the hydroclimates. These sediments are strongly linked to regional hydroclimatic conditions and will be used for reconstructing changes at an interannual time scale. We will complement these reconstructions with analyses of leaf wax hydrogen isotopes (δD) to trace variations in atmospheric circulation, water vapor transport, and seasonal rainfall patterns. Regionally coherent signatures of glacial-interglacial cycles have been obtained from the Dead Sea sediment record using D reconstructions. The proposed decadal to centennial reconstruction proposed here will provide key insights into precipitation regimes during warming of the penultimate glaciation to the last interglacial. In addition, detailed chronostratigraphic correlation of these record will be performed using the latest varve age-depth modelling and (crypto)tephrochronology to minimize the age uncertainties. These detailed synoptic reconstructions will contribute to a comprehensive picture of past climatic dynamics and global linkages over the eastern Mediterranean during one of the strongest warming intervals of the Late Quaternary.

地中海地区对当前的全球变暖高度敏感，这对水文气候和极端天气事件的发生有很大影响。然而，死海和凡湖的湖泊水位重建揭示了由于过去的全球气候变化而导致的降雨量变化。然而，气候变暖期间的当地反应仍然不为人所知，我们的目标是在倒数第二次冰期到最后一次间冰期（过去 800 年中最温暖的间冰期）过渡期间，对这两个地点进行详细和综合的比较。死海 ICDP 5017-1 钻探点和凡湖钻探点 5034-1（Ahlat Ridge）的层状湖泊沉积物为研究全球变暖对水文气候的影响提供了独特的档案。水文气候条件，并将用于重建年际时间尺度的变化，我们将通过叶蜡氢同位素 (δD) 分析来补充这些重建，以追踪变化。使用 D 重建从死海沉积物记录中获得了大气环流、水蒸气输送和季节性降雨模式，这将为了解该期间的降水状况提供重要见解。倒数第二次冰期到最后一次间冰期的变暖此外，这些记录的详细年代地层相关性将使用最新的 varve 年龄深度模型和（密码）年代学进行。这些详细的天气重建将有助于全面了解晚第四纪最强烈的变暖时期之一地中海东部的过去气候动态和全球联系。