Continuous recordings of environmental parameters at station 19, Brodtener_Ufer (2022-09 - 2024-09)

Additionally, at four shallow water stations (Booknis Eck, Buelk, Behrensdorf and Katharinenhof) temperature, salinity and dissolved oxygen are continuously logged at 2-3 m depth by self-contained data loggers. These are: (I) MiniDOT loggers (Precision Measurement Engineering; http://pme.com; ±10 µmol L-1 or ±5 % saturation) including copper antifouling option (copper plate and mesh) to measure dissolved oxygen concentration and (II) DST CT salinity & temperature loggers (Star-Oddi; http://star-oddi.com; ±1.5 mS cm-1) to record the conductivity. Both sensor types additionally record water temperature with an accuracy of ± 0.1 °C. The sampling interval was set to 30 minutes for all parameters. In context of the long-term monitoring project RegLocDiv (Regional-Local-Diversity) by M. Wahl (Franz, M. et al. 2019a), another seven stations were equipped with the same two types of sensors at 4-6 m depth to continuously record environmental parameters (again: temperature, salinity, dissolved oxygen) and included into this data set. These stations are at: Falshoeft, Booknis Eck, Schoenberg, Westermarkelsdorf, Staberhuk, Kellenhusen and Salzhaff (abandoned in 2023). Since 2021, in the context of implementing a reef monitoring to fulfil obligations by the EU Habitats Directive, step-by-step, eleven further stations were installed at reefs in the Schleswig-Holstein Baltic Sea. These are at: Platengrund (14 m depth) and Mittelgrund (8 m) (both since 2021), at Walkyriengrund (9 m), Brodtener Ufer (8 m), Außenschlei (11 m), Kalkgrund (8 m), Stollergrund (7.5 m) and Flueggesand (10 m) (all since 2022), as well as at Gabelsflach (10 m), Sagasbank (8.5 m) and Stabehuk (11.5 m) (all since 2023). Again, at all of these 11 stations, temperature, salinity and dissolved oxygen are continuously logged by self-contained data loggers: Conductivity (and temperature) is logged by HOBO® Salt Water Conductivity/Salinity Data Logger (Onset Computer Corporation, Bourne, MA, USA; https://www.onsetcomp.com) using the U2X protective housing to prevent fouling on the sensors. The same MiniDOT loggers (Precision Measurement Engineering) as at the above mentioned more shallow stations (including antifouling copper plate and mesh) are used to measure dissolved oxygen concentration. Dissolved oxygen concentration data measured by the MiniDOT loggers are corrected for a depth of 10 m (or 2,5 m on the shallow stations) using the software provided by the manufacturer. Additionally, a manual compensation for salinity was calculated (see details in Franz, M. et al. 2019b). Quality control was carried out by spike and gradient tests, following recommendations of SeaDataNet quality control procedures (see https://seadatanet.org/Standards/Data-Quality-Control). All data values were flagged according to applied quality checks using the following flags: 1 = Pass, 2 = Suspect, 3 = Fail, 4 = Visually suspect, 5 = Salinity compensation fail (further explanations can be found in Franz, M. et al. 2019b).

此外，在4个浅水站位（Booknis Eck、Buelk、Behrensdorf及Katharinenhof），研究人员采用自持式数据记录仪，于2-3米水深处持续记录温度、盐度与溶解氧数据。所用记录仪分为两类：（I）MiniDOT记录仪（Precision Measurement Engineering；http://pme.com；测量精度±10 µmol L⁻¹或±5%饱和度），配备铜基防污装置（铜板与铜网）以监测溶解氧浓度；（II）DST CT盐度与温度记录仪（Star-Oddi；http://star-oddi.com；测量精度±1.5 mS cm⁻¹），用于记录电导率。两类传感器均可同步记录水温，测量精度为±0.1℃。所有参数的采样间隔均设为30分钟。

在M. Wahl主导的长期监测项目RegLocDiv（Regional-Local-Diversity）（Franz, M. et al. 2019a）框架下，另有7个站位在4-6米水深处安装了同款两类传感器，以持续记录温度、盐度、溶解氧三类环境参数，相关数据已纳入本数据集。这些站位分别为：Falshoeft、Booknis Eck、Schoenberg、Westermarkelsdorf、Staberhuk、Kellenhusen及Salzhaff（Salzhaff站位于2023年停用）。

自2021年起，为落实欧盟生境指令（EU Habitats Directive）规定的义务，研究人员逐步在石勒苏益格-荷尔斯泰因波罗的海的礁区增设11个监测站位。具体包括：Platengrund（水深14米，2021年起启用）、Mittelgrund（水深8米，2021年起启用）、Walkyriengrund（水深9米，2022年起启用）、Brodtener Ufer（水深8米，2022年起启用）、Außenschlei（水深11米，2022年起启用）、Kalkgrund（水深8米，2022年起启用）、Stollergrund（水深7.5米，2022年起启用）、Flueggesand（水深10米，2022年起启用），以及Gabelsflach（水深10米，2023年起启用）、Sagasbank（水深8.5米，2023年起启用）、Stabehuk（水深11.5米，2023年起启用）。

在上述11个礁区站位中，研究人员同样采用自持式数据记录仪持续记录温度、盐度与溶解氧数据：电导率（及水温）通过HOBO®海水电导率/盐度数据记录仪（Onset Computer Corporation，美国马萨诸塞州伯恩市；https://www.onsetcomp.com）记录，该设备配备U2X防护外壳以防止传感器附着污损。溶解氧浓度监测仍采用前述浅水站位所用的同款MiniDOT记录仪（Precision Measurement Engineering，配备防污铜板与铜网）。MiniDOT记录仪测得的溶解氧浓度数据，需通过厂商提供的软件校正至标准水深（浅水站位校正至2.5米，其余站位校正至10米），此外还需根据盐度进行手动补偿（详细方法参见Franz, M. et al. 2019b）。

质量控制环节采用峰值测试与梯度测试，遵循SeaDataNet质量控制规程的相关建议（详见https://seadatanet.org/Standards/Data-Quality-Control）。所有数据均依据所实施的质量检查结果进行标记，标记规则如下：1=通过，2=可疑，3=失败，4=目视可疑，5=盐度补偿失败（详细说明参见Franz, M. et al. 2019b）。