Continuous water level observations at station BEFmate_I10pio, 2020-01 to 2023-01

Data presented here were collected between 2020-01 and 2023-01 at station BEFmate_I10pio within the research unit DynaCom (Spatial community ecology in highly dynamic landscapes: From island biogeography to metaecosystems, https://uol.de/dynacom/ ) involving the Universities of Oldenburg, Göttingen, and Münster, the iDiv Leipzig and the Nationalpark Niedersächsisches Wattenmeer. Experimental islands and saltmarsh enclosed plots were established in the back-barrier tidal flat and in the saltmarsh zone of the island of Spiekeroog (Germany). Groundwater levels at different elevation zones were measured using pressure loggers deployed in dip wells within the experimental islands as well as in the saltmarsh enclosed plots. Measurements were obtained using Hobo U20L Water Level Loggers (Onset Computer Corporation, Bourne, MA/USA). All devices were pre-calibrated by the manufacturer. Logged data were retrieved in the field using a Hobo Underwater Shuttle (U-DTW-1) and were read out with the HOBOware Pro (V3.7.28) software, Subsequent data processing was done using MATLAB (R2024b). Atmospheric pressure correction for water-level calculations was applied using data from a nearby weather station. Post-processing and quality control included (a) the removal of data covering maintenance activities, (b) an outlier detection, and (c) visual checks. Outliers in water level and temperature time series were detected using a moving-median filter and a 3-sigma criterion, with additional cross-checking against a reference sensor. Identified outliers were removed, and height-corrected water level series were produced to ensure consistency across sensors and years.

本数据集采集于2020年1月至2023年1月，采集站点为DYNACom研究单元（高动态景观中的空间群落生态学：从岛屿生物地理学到元生态系统，https://uol.de/dynacom/）下属的BEFmate_I10pio站点，参与单位包括奥尔登堡大学、哥廷根大学、明斯特大学、莱比锡iDiv研究所以及下萨克森瓦登海国家公园。研究团队在德国施皮克岛的后障潮坪与盐沼区域设立了实验岛屿与盐沼围封样地。研究人员通过部署于实验岛屿及盐沼围封样地内斜井中的压力记录仪，对不同高程带的地下水位进行监测。本次监测采用的设备为Hobo U20L水位记录仪（美国马萨诸塞州伯恩市Onset Computer Corporation制造），所有设备均由厂商预先完成校准。野外采集的记录数据通过Hobo水下传输器（U-DTW-1）取回，并使用HOBOware Pro（V3.7.28）软件进行读取。后续的数据处理工作采用MATLAB（R2024b）完成。在水位计算过程中，结合邻近气象站的大气压力数据开展校正。后期处理与质量控制包含以下环节：(a) 剔除维护期间的采集数据；(b) 异常值检测；(c) 人工目视核查。水位与温度时间序列的异常值通过移动中值滤波与3σ准则识别，并辅以参考传感器进行交叉验证。所有识别出的异常值均被移除，最终生成经高程校正的水位序列，以确保不同传感器及不同年度采集数据的一致性。