High-resolution pollen record of the last 13,500 years derived from AMS radiocarbon dated sediments of Lake Ochaul in Cis-Baikal (Eastern Siberia)@en

A 260-cm-long section of a sediment core from Lake Ochaul (54°14'N, 106°28'E; 641 m a.s.l.), a freshwater lake in the Cis-Baikal region, ca. 100 km northwest of Lake Baikal, was analysed for pollen and non-pollen palynomorphs. This high-resolution AMS-dated record covers the Lateglacial and Holocene interval between ca. 13,500 cal yr BP and the present. A total of 84 samples from the Och18-II-1 and Och18-II-2 sections have been treated using dense media separation to extract pollen and non-pollen palynomorphs (e.g. fern and moss spores, Chironomidae remains, Botryococcus and Pediastrum green algae colonies) for further microscopic analysis.奥恰乌尔湖（Lake Ochaul）是外贝加尔地区的淡水湖，地理坐标为北纬54°14′、东经106°28′，海拔641米，距贝加尔湖西北约100公里。本次研究对该湖一段长260厘米的沉积岩芯开展了花粉与非花粉类孢粉型体（non-pollen palynomorphs）分析。这份经加速器质谱（AMS）测年的高分辨率记录，覆盖了约13500校准年BP至今的晚冰期（Lateglacial）至全新世（Holocene）时段。研究人员对取自Och18-II-1与Och18-II-2岩芯段的共计84个样品，采用重液分离法提取花粉与非花粉类孢粉型体，包括蕨类与苔藓孢子、摇蚊科（Chironomidae）昆虫残骸、丛粒藻属（Botryococcus）与盘星藻属（Pediastrum）绿藻群落等，以开展后续显微分析。