Mesozooplankton average mass during KRISTALL cruise KR60_69, Part II

Mesozooplankton was sampled by open-closing JUDAY net with a 36 cm ring diameter and mesh size of 125 µm. The open-closing mechanism used was the Nansen mechanical lock system allowing nets to be vertically towed through standard depths (0-10, 10-25, 25-50, 50-100, 100-200, 200-300, 300-500 m) and closed at the upper depth level. Depth of tow was evaluated by wire paid out and the angle of wire inclination. The 10-20 ml samples were preserved in 3-4% buffered formaldehyde and processed on return to the laboratory. All of copepods were identified to genus level, other taxanomic groups - to type, class, order and family levels.

本数据集针对中型浮游动物（Mesozooplankton）的采样采用网口直径36 cm、网目尺寸125 µm的开闭式JUDAY网（open-closing JUDAY net）完成。该网具搭载的开闭机制为南森机械锁定系统（Nansen mechanical lock system），可使其沿垂直方向在0-10 m、10-25 m、25-50 m、50-100 m、100-200 m、200-300 m、300-500 m的标准水层间拖曳，并在各水层的上层边界处闭合。拖曳水深通过放出缆绳的长度及缆绳倾角进行评估。采集得到的10~20 mL样品经3%~4%缓冲甲醛溶液固定后，于返回实验室后开展后续处理。所有桡足类（copepods）均被鉴定至属级水平，其余分类类群则分别鉴定至型、纲、目及科级水平。