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

这笔赠款支持欧亚大陆贝加尔湖千年尺度分辨率记录的发展。这些沉积物的年龄海洋同位素阶段（MIS）11，一个间冰期被认为是最接近的模拟全新世的过去部分，并可能在类似的地球轨道配置的基础上，未来的全球气候。由于这种相似性，了解MIS 11气候并能够使用现代气候模式模拟MIS 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。（为了增进我们对北方半球MIS 11气候的了解）通过使用贝加尔湖钻孔岩芯的存档沉积物开发新的MIS 11记录，可以说是欧亚大陆最好的连续多代理记录。主要重点将是详细的孢粉学（花粉）和硅藻记录，并辅以来自最新岩心的有机碳和氮代理，其中包含MIS 11间隔的近7米连续部分。这个非常厚的部分，具有强大的年龄模型的基础上的古地磁事件/反转规模，轨道调谐和盆地范围内的硅藻生物地层学，使它可能是最好的MIS 11档案在欧亚大陆。该项目将探讨MIS 11间冰期的三个重要方面：1）新的详细的多代理记录是否支持MIS 11期间间冰期气候变化的现有初步证据？2)MIS 11（或其任何部分）是否比全新世更温暖和/或更潮湿？3)Brunhes中期亚洲大陆的气候趋势是加强还是削弱了MIS 11/全新世的类比？该项目将增加MIS 11在北方半球的空间覆盖范围（大陆MIS 11记录稀少），并提供关于MIS 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MIS 11/全新世类比是可靠的。此外，研究结果将为欧亚大陆更新世地层学以及与变化的植被/生物群落类型相关的陆地生产力、碳输出和储存提供新的重要影响。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.