In Search of Past Analogs to the Current Interglacial: MIS 11 Climate Record

这笔赠款支持开发欧亚大陆贝加尔湖千年尺度的分辨率记录。这些沉积物的年龄为海洋同位素阶段(MIS11)，这是一个间冰期，被认为是与全新世已经过去的部分最相似的时期，也可能是基于地球现在和那时的类似轨道布局而与未来的全球气候最相似的时期。由于这种相似性，了解管理信息系统11的气候并能够使用现代气候模型模拟管理信息系统11的气候特征对于提高我们预测未来气候的能力至关重要。本项目通过使用贝加尔湖钻探岩心的存档沉积物开发新的管理信息系统11记录来解决第一个挑战(促进我们对北半球气候的理解)，这可以说是欧亚大陆最好的连续多代理记录。主要焦点将是详细的孢粉(花粉)和硅藻记录，并辅之以来自最新钻探岩心的有机碳和氮替代物，该钻探岩心包含一段近7米长的连续的MIS11段。这一非常厚的剖面具有基于古地磁事件/反转尺度、轨道调整和盆地范围的硅藻生物地层学的可靠的年龄模型，使其成为欧亚大陆最好的MIS11档案。该项目将探索间冰期信息管理系统11的三个重要方面：1)新的详细的多指标记录是否支持信息系统11期间间冰期气候变化的现有初步证据？2)信息系统11(或其任何部分)是否比全新世更温暖和/或更潮湿？3)亚洲大陆在布伦山中期的气候趋势是加强还是削弱信息系统11/全新世的类比？该项目将增加北半球信息系统11的空间覆盖面(大陆信息系统11记录稀少)，并提供有关信息系统11间冰期气候温暖和稳定性的新数据。该项目还将测试在中更新世气候趋势的背景下，哪些直接的MIS11/全新世类比是可靠的。此外，这些结果将为欧亚大陆更新世地层学以及与变化的植被/生物群类型有关的陆地生产力、碳输出和储存提供新的重要意义。将与俄罗斯和白俄罗斯的机构合作开展工作。

This grant supports the development of millennial-scale resolution records from Lake Baikal in continental Eurasia. These sediments are of age Marine Isotope Stage (MIS) 11, an interglacial period considered the closest analog to the elapsed portion of the Holocene and possibly to global climate of the future based on similar orbital configurations of the Earth now and then. Because of this similarity, understanding MIS 11 climate and being able to simulate climatic characteristics of MIS 11 using modern climatic models is essential to improve our ability to predict future climate.This project addresses the first challenge (to advance our understanding of MIS 11 climate in the Northern Hemisphere) by developing a new MIS 11 record using the archived sediments from Lake Baikal drill cores, representing arguably the best continuous multi-proxy records from continental Eurasia. The main focus will be detailed palynological (pollen) and diatom records, supplemented by organic carbon and nitrogen proxies from the latest drill core, which contains an almost 7-meter continuous section of the MIS 11 interval. This remarkably thick section, with a robust age model based on paleomagnetic event/reversal scale, orbital tuning and basin-wide diatom biostratigraphy, makes it perhaps the best MIS 11 archive in continental Eurasia. The project will explore three important aspects of the MIS 11 interglacial:1) Do the new detailed multi-proxy records support existing preliminary evidence for interglacial climate variability during MIS 11?2) Was MIS 11 (or any part of it) warmer and/or more humid than the Holocene?3) Does the climatic trend in continental Asia during the mid-Brunhes reinforce or weaken the MIS 11/Holocene analogy?The project will increase spatial coverage of MIS 11 in the Northern Hemisphere (continental MIS 11 records are sparse) and provide new data on warmth and stability of MIS 11 interglacial climate. The project will also test which of the direct MIS 11/Holocene analogies are reliable in the context of mid-Pleistocene climatic trend. In addition, results will provide new important implications for Pleistocene stratigraphy in Eurasia and for terrestrial productivity, carbon export and storage linked with changing vegetation/biome types. Work will be carried out in collaboration with institutions in Russia and Belarus.