Pollen and non-pollen palynomorph counts from Lake Van, Turkey@en

We illustrate the response of local and regional vegetation, aquatic ecosystem, and fire activity to volcanic eruptions in close connection to prevailing climate conditions. To understand these complex responses, we selected five volcaniclastic depositions in the Lake Van (Turkey) sediments from different interglacial/glacial periods. We analyzed high-resolution pollen data, non-pollen palynomorphs (NPPs), and microscopic charcoal particles (>20 µm) from annually laminated lacustrine sediments with precise age control, allowing us to quantify recovery time in varve years. This study highlights that the extent and duration of the volcanic event, the thickness of subsequent volcanic deposits, the respective climatic conditions strongly influence the impact on terrestrial and aquatic ecosystems.本研究阐明了局地与区域植被、水生生态系统以及火活动，在与当时盛行气候条件紧密关联下对火山喷发的响应过程。为厘清此类复杂响应机制，我们从土耳其凡湖（Lake Van）沉积物中选取了5套形成于不同冰期/间冰期阶段的火山碎屑沉积记录。我们对具备精确年代控制的年纹层状湖相沉积物开展了高分辨率孢粉数据、非花粉孢粉类（non-pollen palynomorphs, NPPs）以及粒径大于20 µm的显微炭屑颗粒的分析工作，借此可基于纹泥年量化生态系统的恢复时长。本研究表明，火山事件的波及范围与持续时长、后续火山沉积层的厚度，以及当时的区域气候条件，均会显著影响火山活动对陆地与水生生态系统的冲击程度。