Vertical profiles of photochemically induced percent changes in dissolved organic matter in samples from SEATS and F2@en

Two stations were visited in the western tropical Pacific Ocean: The South-East Asia Time-series Station (SEATS) in the northern South China Sea (SCS) and station F2 in the Philippine Sea, ~230 km to the northeast of the Luzon Strait. Water samples were taken aboard the R/V Dong-Fang-Hong 2 in July and August 2017 from 13 depths between 5 m and 3800 m at SEATS and 11 depths between 5 m and 3200 m at F2 using Niskin bottles mounted on a SeaBird 911 conductivity-temperature-depth (CTD) rosette sampler. The percentage change of different parameters was calculated as the ratio of the signal difference of property X before and after irradiation to that before irradiation.本研究在西热带太平洋布设两个调查站位：位于南海北部的东南亚时间序列站（South-East Asia Time-series Station, SEATS），以及吕宋海峡东北方向约230公里处菲律宾海的F2站位。2017年7-8月，搭载“东方红2号”科考船（R/V Dong-Fang-Hong 2），采用安装于SeaBird 911型温盐深（conductivity-temperature-depth, CTD）采水架上的尼斯金采水器（Niskin bottles）采集水样：其中SEATS站位采集了5米至3800米间共13个深度层的水样，F2站位采集了5米至3200米间共11个深度层的水样。不同参数的变化百分比以辐照前后目标属性X的信号差值与辐照前信号值的比值进行计算。