Pollen record of core GOS18 from Lake Gościąż

To revise the chronology for the Lake Gościąż record, sediment cores were retrieved during two field campaigns in 2015 and 2018. Four overlapping sections were collected using a UWITEC Piston Corer (Ø 90 mm) in the deepest part of Lake Gościąż, Poland (52.583022 N, 19.339946 E). The chronology was obtained by triple varve counting on petrographic thin sections that was complemented by 137Cs measurements and 14C AMS dating of terrestrial plant remains. Additionally, part of the chronology between 520-758 cm was obtained through age-depth modelling. Pollen analysis was performed for seventy one samples, prepared according to standard procedure, and analyzed in three intervals: i) from 1859.9 cm to 1874.4 cm with 2 cm resolution, ii) from 1880.2 cm to 1896.7 cm with 1-2 cm resolution and iii) from 1741.4 cm to 1798.4 cm with 0.5-3 cm resolution. The record is mostly varved and the bottom of the composite profile coincides with the onset of lacustrine sedimentation in the late Allerød at 12,834 +134/-233 varve yrs BP.

为校正戈斯蒂亚兹湖（Lake Gościąż）沉积记录的年代序列，研究团队于2015年与2018年开展两次野外考察，获取沉积岩芯。于波兰戈斯蒂亚兹湖最深处（坐标：52.583022°N，19.339946°E），采用UWITEC活塞式取芯器（UWITEC Piston Corer，Ø 90 mm）采集了四段重叠的岩芯段。本研究通过对岩石薄片开展三层纹层计数，并结合铯-137（137Cs）放射性测量与陆生植物残体的14C加速器质谱（Accelerator Mass Spectrometry, AMS）测年，构建了该沉积序列的年代框架。此外，针对520~758 cm深度区间的年代序列，通过年龄-深度建模方法进行补充校准。研究对71个沉积物样品开展孢粉分析，样品制备遵循标准实验流程，分析分为三个区间：① 1859.9 cm至1874.4 cm，采样分辨率为2 cm；② 1880.2 cm至1896.7 cm，采样分辨率为1~2 cm；③ 1741.4 cm至1798.4 cm，采样分辨率为0.5~3 cm。该沉积记录以纹层沉积为主，复合剖面的底部对应晚阿勒罗德期（Allerød）湖相沉积的起始阶段，其纹层计年距今（varve yrs BP）年代为12834⁺¹³⁴_-233。