Regional reconstruction of water availability to extend instrumental hydroclimatic records into the Late Holocene – a high-resolution investigation of natural archives dated in calendar-years from maar-lake sediments in the Newer Volcanic Province, south-

水资源可用性的区域重建，以将仪器水文气候记录扩展到全新世晚期——对南部新火山省玛珥湖沉积物中历年自然档案进行高分辨率调查

• 批准号: 457251753
• 负责人: Professor Dr. Bernd Zolitschka
• 金额: --
• 依托单位: Sektion Geophysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/457251753?language=en
• 关键词: Regional; reconstruction; water; availability; extend

We will develop a regional hydroclimatic record from a climatic center-of-action in the Southern Hemisphere. Based on calendar-year timescales, site-specific and ultra-high resolution environmental parameters will be obtained with novel non-destructive sediment scanning-techniques. Together with standard yet high-resolution multiproxy analyses, data will be merged to yield regional records of precipitation/evaporation ratios, lake level fluctuations, changes in trophic state, soil erosion and mixing regimes that will tap unprecedented and sensitive information about hydroclimatic variability. Understanding of decadal to centennial climate variability is significantly lacking for the Southern Hemisphere, from where no precisely dated hydroclimate records extend beyond the last centuries. This is particularly the case for severe hydroclimatic extremes, such as droughts and floods with their environmental consequences, which are closely tied to key modes of large-scale atmospheric circulation patterns with many socio-economic and environmental implications. To overcome this lack of data, annually laminated (varved) lake sediments provide excellent natural archives for obtaining high-resolution hydroclimate records covering many millennia. Based on underutilized lacustrine sediment archives in SE Australia and their strategic position in a center-of-action of the global climate system, we propose to investigate sediment records from crater lakes of the Newer Volcanic Province (NVP), where two sites archived varved sediments while for two additional lakes annual laminations are expected. With recent advances in computed tomography (µCT) scanning, a technology became available for decoding sediment matrices with ultra-high resolution providing sub-seasonally resolved radiographic images suitable for cost and time efficient varve recognition, characterization and measurement. We will explore this technology and develop innovative ways for establishing calendar-year chronologies. These precise timescales we will put in value innovative micro X-ray fluorescence (µXRF) and hyperspectral image (HSI) scanning as well as lower resolution standard sedimentological, geochemical, geophysical and biological analyses. Thus, unprecedented insights into past environmental and climatic variability will be provided tapping new information that will add to our understanding of linkages between local environmental conditions and hemispheric climate modes to better comprehend contemporary and future climate change.

我们将从南半球的气候活动中心建立一个区域水文气候记录。将利用新的非破坏性沉积物扫描技术，以十年时间尺度为基础，获得特定地点的超高分辨率环境参数。数据将与标准但高分辨率的多重代理分析相结合，以产生降水/蒸发比率、湖平面波动、营养状态变化、土壤侵蚀和混合状况的区域记录，这将利用有关水文气候变异性的前所未有的敏感信息。对南半球十年至百年气候变率的了解非常缺乏，在那里没有精确的水文气候记录延伸到过去几个世纪。严重的水文气候极端情况尤其如此，例如干旱和洪水及其环境后果，这些情况与具有许多社会经济和环境影响的大规模大气环流模式的关键模式密切相关。为了克服这种缺乏数据，每年层压（纹）湖泊沉积物提供了很好的自然档案，获得高分辨率的水文气候记录，涵盖数千年。基于未充分利用的湖泊沉积物档案在澳大利亚东南部和他们的战略地位，在全球气候系统的行动中心，我们建议调查火山口湖泊的沉积物记录较新的火山省（NVP），其中两个网站存档纹状沉积物，而另外两个湖泊每年的叠层。随着计算机断层扫描（µ CT）的最新进展，一种技术可用于以超高分辨率解码沉积物基质，提供适合于成本和时间有效的纹层识别、表征和测量的次季节分辨率射线照相图像。我们将探索这一技术，并开发创新的方法来建立年份年表。这些精确的时间尺度将为创新的微X射线荧光（µ XRF）和高光谱图像（HSI）扫描以及较低分辨率的标准沉积学、地球化学、地球物理和生物分析带来价值。因此，利用新的信息将提供对过去环境和气候变异性的前所未有的见解，这些信息将增加我们对当地环境条件与半球气候模式之间联系的理解，以更好地理解当代和未来的气候变化。