Light intensity time series from 16 locations in Løgstør Bredning, Limfjorden, Denmark, at 3 m above seabed, 9-March-2017

Field studies were conducted in two different areas of the Limfjorden, in Lovns Bredning (26th February to 4th March 2017) and in Løgstør Bredning (6-10th March 2017). In each sampling area, 16 fixed-position moorings were deployed in two circular sensor arrays around a mussel dredging area to investigate possible effects of dredging related sediment plumes (Pastor et al, 2020). The inner array (stations 1 - 8) had a diameter of 200 m and the outer array (stations 9 - 16) was set up with a diameter of 600 m. Integrated temperature and light loggers (HOBO Pendant Temperature/Light 64K Data Logger) were mounted on each mooring in the two circular arrays at three different water depths (0.5, 1.5 and 3.0 m above seabed). The 48 loggers (3 depths and 16 stations) were deployed in each area over a period of four days and light intensity time series were collected with a sampling interval of 30 seconds. Five loggers in the Lovns area did not provide any data due to technical problems (two near-surface loggers and three loggers at 1.5 m above the seabed). However, only one bottom logger at Løgstør Bredning failed to provide data. Each time series was filtered using a 3-minute moving average for removing the largest outliers, but retaining sharp changes in light intensity associated with short-lived sediment plumes caused by experimental mussel dredging.本研究在利姆峡湾（Limfjorden）的两个不同区域开展野外实地调研，分别为洛夫斯湾（Lovns Bredning，2017年2月26日至3月4日）与勒格斯托湾（Løgstør Bredning，2017年3月6日至10日）。在每个采样区域内，研究人员于贻贝捕捞区周边布设两组圆形传感器阵列，共计16台固定系泊设备，以探究贻贝捕捞作业相关沉积物羽流的潜在影响（Pastor et al, 2020）。其中内圈阵列（站位1至8）直径为200米，外圈阵列（站位9至16）直径设置为600米。在两组圆形阵列的每个系泊设备上，均安装了集成式温度与光照记录仪（HOBO Pendant Temperature/Light 64K Data Logger），布设水深分别为距海底0.5米、1.5米及3.0米。每个区域共部署48台记录仪（对应3个水深与16个站位），部署周期为4天，采集光照强度时间序列的采样间隔为30秒。洛夫斯湾区域有5台记录仪因技术故障未产出有效数据（其中2台为近表层记录仪，3台为距海底1.5米处的记录仪）。而勒格斯托湾区域仅1台底层记录仪未采集到有效数据。所有时间序列均采用3分钟移动平均滤波处理，以去除极端异常值，同时保留实验性贻贝捕捞引发的短时沉积物羽流对应的光照强度突变信号。