Raw modern diatom counts from a transect across Dronning Marie Dal saltmarsh, SE Greenland

The dataset is raw diatom counts (minimum 250 count size) from a transect across a modern saltmarsh at the mouth of Dronning Marie Dal in south east Greenland (63.470N, -41.925W). The data was collected on 19/07/2014 during a research cruise to the area as part of the X_Centuries research project funded by the Danish Council for Independent Research 30 (FNU) (grant no. DFF-0602-02526B). Samples were taken from the top 1 cm of saltmarsh sediment using a knife, bagged and shipped to the laboratory where they were prepared for diatom analysis using standard methods (Palmer and Abbott 1986). Counts were taken under a light microscope at 400x magnification. Only unbroken valves were counted. The taxonomy follows Van der Werff and Huls (1958-74), Hartley (1996) and Patrick and Reimer (1966, 1975). Samples were surveyed in the field using a Sokkisha level to mean tide level, established via a pressure transducer that logged tidal variations at 15-min intervals at Timmiarmiut, 100 km to the South, during fieldwork. These tidal levels were related to tidal predictions at Tasiilaq, 300 km to the NE. This data was collected to develop a modern training set of diatom distributions across saltmarshes in Greenland to aid in reconstructing past sea-level changes from saltmarsh sediments in this area.

本数据集为源自格陵兰东南部德朗宁玛丽达尔（Dronning Marie Dal）河口现代盐沼断面的原始硅藻计数数据（最小计数规模为250个），坐标为63.470°N，-41.925°W。该数据采集于2014年7月19日，属于由丹麦独立研究理事会30（FNU）资助的X_Centuries研究项目的区域科考航次内容，项目编号为DFF-0602-02526B。样品采用小刀采集自盐沼沉积物表层1厘米处，封装后运送至实验室，依照标准方法（Palmer与Abbott，1986）完成硅藻分析样品制备。计数工作在400倍放大倍率的光学显微镜下开展，仅统计完整的硅藻壳瓣。分类学参照Van der Werff与Huls（1958-1974）、Hartley（1996）以及Patrick与Reimer（1966、1975）的研究标准。野外调查期间，研究人员使用索基莎水准仪（Sokkisha）结合平均潮位进行样品定位；平均潮位通过部署于南部100公里处提米阿米特（Timmiarmiut）的压力传感器以15分钟间隔记录潮汐变化得到，并与东北部300公里处塔西拉克（Tasiilaq）的潮汐预报数据进行关联校准。本数据集旨在构建格陵兰盐沼硅藻分布的现代训练集，以助力该区域盐沼沉积物记录的古海平面变化重建工作。