Mesozooplankton biomass during KRISTALL cruise KR60, Part II@en

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.中型浮游动物（Mesozooplankton）样本采用环径36 cm、网目尺寸125 µm的开合式JUDAY网采集。该网具的开合机构采用南森（Nansen）机械锁定系统，可使网体在标准水层（0-10 m、10-25 m、25-50 m、50-100 m、100-200 m、200-300 m、300-500 m）间进行垂直拖网，并在上层深度边界处闭合。拖网深度通过放出的缆绳长度与缆绳倾斜角度进行测算。所获10~20 mL样本经3%~4%缓冲甲醛溶液固定后，在返回实验室后开展后续处理。所有桡足类（copepods）均被鉴定至属级分类阶元，其余分类学类群则分别鉴定至型、纲、目及科级分类阶元。