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-

我们将从南半球的气候活动中心开发区域水文气候记录。根据历年时间尺度，将利用新的非破坏性沉积物扫描技术获得特定地点和超高分辨率的环境参数。与标准但高分辨率的多重代理分析一起，数据将被合并，以产生关于降水/蒸发率、湖泊水位波动、营养状态变化、土壤侵蚀和混合制度的区域记录，这些记录将利用关于水文气候变异性的前所未有的敏感信息。南半球严重缺乏对十年至百年气候变异性的了解，那里没有准确的水文气候记录可以追溯到过去几个世纪。严重的水文气候极端情况尤其如此，例如干旱和洪水及其对环境的影响，它们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。为了克服这种数据的缺乏，每年的层状湖泊沉积物为获得数千年来的高分辨率水文气候记录提供了极好的自然档案。基于澳大利亚东南部未被充分利用的湖泊沉积物档案及其在全球气候系统中的战略地位，我们建议调查较新的火山口省(NVP)火山口湖的沉积物记录，那里有两个地点记录了各种沉积物，而另外两个湖泊预计将有年度纹层。随着计算机断层扫描(µCT)扫描的最新进展，一种用于解码超高分辨率沉积物基质的技术变得可用，提供适合于成本和时间高效的波纹识别、表征和测量的亚季节性分辨率的射线图像。我们将探索这项技术，并开发建立日历年表的创新方法。这些精确的时间尺度将使我们重视创新的微型X射线荧光(µXRF)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。因此，将提供对过去环境和气候变化的前所未有的洞察，利用新的信息将增加我们对当地环境条件和半球气候模式之间的联系的理解，以更好地理解当代和未来的气候变化。

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.