RAPID: Analyzing dDwax in the Dead Sea DSDDP Core as an Indicator of Aridity and a Stratigraphic Aid

技术说明这笔赠款将支持使用DWAX代理作为地层指南，并作为最近钻探的死海深海钻探项目(DSDDP)沉积物过去干燥度变化的指标。这些结果将用于改进岩心地层学，在进行进一步分析之前必须实现这一点。该项目将从死海DSDDP岩心产生一个初步的200ka；DWAX记录，它将对DSDDP岩心提供关键的地层控制，有助于解释重大气候事件，如最后一次间冰期死海的干燥，并洞察莱万特地区过去干旱的变化，包括冰期期间的水文气候状态，围绕这一问题存在很大争议。DWAX的地层学效用来自于其追踪海洋同位素阶段的明确能力，使得能够在全球海洋同位素地层学的背景下对岩芯中的DWAX和其他可解释的代用品进行相对比较。这些石蜡数据的发展将在DSDDP项目的国际进展中发挥关键作用，因为测年结果将允许其他代理和岩心描述工作放在时间背景下。非技术描述本研究将调查当地洞穴石笋结果之间的明显不一致性，这表明在上一次冰川周期(约.这项研究将支持一名早期职业研究人员、一名技术人员和一名通过东北大学合作教育计划招聘的本科生实习生。PI还将通过法尔茅斯学院实习计划在她的实验室接待积极的高中生，这是法尔茅斯学院和世界卫生组织正在进行的合作，从而促进当地的外展工作。这些学生将参与死海项目的各个方面，并了解气候变化对莱万特地区的影响。将促进与德国、以色列和日本同事的国际合作。

Technical DescriptionThis grant will support the use of the δDwax proxy as a stratigraphic guide and as an indicator of past changes in aridity for sediments from the recently-drilled Dead Sea Deep Drilling Project (DSDDP). The results will be used to refine the core stratigraphy, which must be achieved before further analyses are conducted. The project will produce a preliminary 200ka δDwax record from the Dead Sea DSDDP core that will provide critical stratigraphic control on the DSDDP core, aiding the interpretation of major climatic events such as the desiccation of the Dead Sea during the last interglacial period, and insights into changes in past aridity in the Levant region, including the state of hydroclimate during glacial periods, around which there is much debate. The stratigraphic utility of δDwax derives from its clear ability to track Marine Isotope Stages, enabling relative comparisons between δDwax and other proxies in the core that can be interpreted in the context of global marine isotope stratigraphy. The development of these δDwax data will play a critical role in the international progress of the DSDDP project as the dating results will allow other proxies and core description work to be put into temporal context.Non-Technical DescriptionThis research will investigate the apparent discordance between results from local cave stalagmites, which indicate long droughts during the last glacial cycle (approx. 100,000 years) and the apparent intermittent high levels of the Dead Sea during this time (known to scientists as the much larger Lake Lisan, which was ~250m deeper, and extended all the way North to the Sea of Galilee/Lake Tiberias, and South to 150km beyond the current shoreline).The research will support an early career researcher, a technician, and an undergraduate intern recruited through the Northeastern University cooperative education program. The PI will also facilitate local outreach efforts by hosting motivated high school students in her lab through the Falmouth Academy Internship program, an ongoing collaboration between Falmouth Academy and WHOI. These students will participate in aspects of the Dead Sea project and learn about the effects of climate change on the Levant region. International collaboration with colleagues from Germany, Israel and Japan will be facilitated.