Synchronized records of Holocene Circum-Baltic environmental change

全新世环波罗的海环境变化的同步记录

• 批准号: 412761144
• 负责人: Dr. Markus Czymzik
• 金额: --
• 依托单位: Leibniz-Institut für Ostseeforschung Warnemünde (IOW)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/412761144?language=en
• 关键词: Synchronized; records; Holocene; Circum; Baltic

The Circum-Baltic ecosystem is highly sensitive to both natural climate forcing and human impact. Its evolution since the last deglaciation is well-documented in sediments from the Baltic Sea itself, as well as in surrounding terrestrial environmental archives. Existing studies point to substantial environmental variability with strong spatial gradients working on inter-annual to millennial time-scales, triggered by a complex interplay of internal and external forcing mechanisms.Despite the diversity of existing paleoenvironmental information, a comprehensive understanding of the Holocene development of the coupled marine-terrestrial Baltic ecosystem is still limited. Main causes are a wide temporal and spatial range of forcing mechanisms and different timings, magnitudes and thresholds of proxy responses in different types of environmental archives. The BaltRap network aims at integrating marine-, annually laminated (varved) lake sediment and tree ring records from the southern Baltic realm for a comprehensive understanding of archive-specific proxy responses to short and long-term climate variations and oscillations as well as the distinction of natural variability from the increasing human impact, at up to the highest possible 'seasonal' resolution.However, since BaltRap focusses on the southern Baltic region, a complete understanding of Circum-Baltic ecosystem responses requires a northward extension of the approach based on varved lake sediment and tree ring records from the Scandinavian Peninsula. This is vital since the northern Baltic realm experienced a substantially different climatic and human development, compared to the South. Moreover, multi-archive investigations of leads and lags of proxy responses necessitate a climate-independent synchronization of the considered archives, minimizing individual chronological uncertainties. Within this proposal, we aim at establishing new seasonally resolved Holocene proxy records of climate and human activity using varved lake sediment and tree ring records from Lake Kälksjön and its catchment (central Sweden), to distinguish the unique Scandinavian influence on the Circum-Baltic ecosystem and extend the BaltRap approach northward. We apply the novel 10Be synchronization tool for a precise synchronization of the Scandinavian Lake Kälksjön record to the existing southern Baltic marine and varved lake sediment archives. Ultimate goal of the research is the first investigation of environmental gradients in the Baltic region during the Holocene based on synchronous multi-archive proxy records. The work will improve our understanding of temporal and spatial ecosystem responses to climatic and human forcing on a new transbaltic North-South transect and provides a step towards a more comprehensive knowledge of Circum-Baltic environmental dynamics, helping to better anticipate future 21st century change.

环波罗的海生态系统对自然气候强迫和人类影响高度敏感。自上次冰消期以来，它的演变在波罗的海本身的沉积物以及周围的陆地环境档案中有很好的记录。现有的研究指出，大量的环境变化与强大的空间梯度工作在年际到千年的时间尺度，引发了复杂的相互作用的内部和外部forcingmechanism.Despite现有的古环境信息的多样性，全面了解全新世发展的耦合海洋-陆地波罗的海生态系统仍然是有限的。主要原因是广泛的时间和空间范围内的强迫机制和不同的时间，大小和阈值的代理响应在不同类型的环境档案。BaltRap网络旨在整合波罗的海南部地区的海洋、每年层压（纹状）湖泊沉积物和树木年轮记录，以全面了解档案特定的代理对短期和长期气候变化和振荡的响应，以及自然变化与人类影响的区别，最高可能的“季节”分辨率。由于BaltRap侧重于波罗的海南部地区，一个完整的了解环波罗的海生态系统的反应，需要向北扩展的方法的基础上，从斯堪的纳维亚半岛的纹湖沉积物和树木年轮记录。这一点至关重要，因为与南方相比，波罗的海北方地区的气候和人类发展情况大不相同。此外，多档案调查的线索和滞后的代理响应需要一个独立于气候的同步所考虑的档案，最大限度地减少个人的时间不确定性。在这一建议中，我们的目标是建立新的季节性解决全新世气候和人类活动的代理记录，利用湖Kälksjön及其集水区（瑞典中部）的varved湖泊沉积物和树木年轮记录，区分独特的斯堪的纳维亚对环波罗的海生态系统的影响，并向北扩展BaltRap方法。我们应用新的10 Be同步工具，精确同步的斯堪的纳维亚湖Kälksjön记录到现有的南波罗的海海洋和多纹湖沉积物档案。 研究的最终目标是在波罗的海地区的环境梯度在全新世的基础上同步多档案代理记录的第一次调查。这项工作将提高我们的时间和空间生态系统的气候和人类强迫对一个新的transbaltic南北样带的理解，并提供了一个更全面的环波罗的海环境动态知识的一步，有助于更好地预测未来的世纪的变化。