Estimating the environmental and societal impact of recent volcanic eruptions is a task aided by direct measurements and historical sources. Beyond the reach of first-hand accounts, our understanding of pre-historic volcanism is often hindered by dating uncertainties inherent to geological archives. Here, we minimize dating errors by analyzing the annually laminated sequences of two Central European lakes, Poggensee and Woseriner See. We focus on environmental transformations that occurred in the decades preceding and following the deposition of the Icelandic Saksunarvatn tephra, dated between ca. 10,300 and 10,200 cal. BP. As a first result, we provide two new independent age determinations for the ash layer detected in both sequences. Our estimates (10,264 ± 24 cal. BP at Poggensee and 10,282 ± 45 cal. BP at Woseriner See) place the age of this tephra deposit closer to Greenland estimates than to continental ones, possibly reducing the chronological gap between the multiple fallout events that characterize the Saksunarvatn Ash. A high resolution palaeoenvironmental characterization was carried out via pollen, thin sections and geochemical analysis. Both sequences show traces of a contemporaneous disturbance event dated to ca. 18 years before tephra deposition. In addition, environmental impact compatible with a cooling event is discernible for ca. 15 years following tephra deposition. While independent climate mechanisms can be responsible for the observed trends, we explicitly focus on exploring volcanic eruptions as a possible leading driver. A consistent agreement across all proxies is lacking in the pre-tephra record, yet sulfur enrichment and acidification processes allow us to suggest volcanism as a plausible trigger. Combined with the post-tephra cooling, the two sedimentary records depict a possible scenario of multi-decadal, continuous volcanic impact.

估计最近火山喷发对环境和社会的影响是一项直接测量和历史资料辅助的任务。除了第一手资料之外，对地质档案文件固有的不确定性进行测年常常会阻碍我们对史前火山活动的理解。在这里，我们通过分析两个中欧湖泊Poggensee和Woseriner See的年叠层序列来最小化日期误差。我们重点研究环境变化，这些变化发生在冰岛Saksunarvatn tephra沉积前后大约几十年之间。10,300和10,200卡路里 BP。作为第一个结果，我们为两个序列中检测到的灰层提供了两个新的独立年龄确定。我们的估算值（在Poggensee的BP为10,264±24 cal。和10,282±45 cal。BP位于Woseriner See的BP公司将这种特非拉沉积物的年龄比格陵兰岛的沉积物更接近大陆的年龄，这可能缩小了以Saksunarvatn Ash为特征的多次沉降事件之间的时间差异。通过花粉，薄片和地球化学分析对高分辨率古环境进行了表征。这两个序列都显示了一个同时期扰动事件的痕迹，其历史可追溯到大约。蒂法拉沉积前18年。另外，对于冷却，可识别与冷却事件相容的环境影响。蒂法拉沉积后15年。尽管独立的气候机制可能是观察到的趋势的原因，但我们明确地专注于探索火山喷发作为可能的主要驱动力。在拍前记录中，所有代理人之间缺乏一致的协议，然而，硫的富集和酸化过程使我们认为火山爆发是可能的触发因素。结合龙卷风后的冷却，这两个沉积记录描述了多年代，连续火山影响的可能情况。