Primary production, biomass, size structure and nitrogen nutrition of phytoplankton in the Coral Sea (RV Franklin Cruise 05/85)

Subsamples of water for chlorophyll analyses were taken from water samples collected in the upper 150 meters at most first leg stations. In addition to unfractionated subsamples (total population), portions of the subsamples were size-fractionated through 10 and 22μm screens to estimate the contributions of net- (>10μm), nano- (10-2μm) and pico-phytop1ankton 2 and 0.5% surface irradiance) depths generally exceed 120 m. On one occasion, a secchi disk depth of 47 meters was recorded. Under normal good viewing conditions, secchi depths were generally between 35 and 40 m.Duplicate vertical zooplankton tows (60μm mesh) were made daily at each productivity station to obtain an estimate of zooplankton biomass and community structure in the euphotic zone. A limited number of tows were made at night to give comparative day/night changes.This research was undertaken during legs 1 and 2 of the RV Franklin Cruise 5/85.Leg 1 - 1/10/85 to 21/10/85Leg 2 - 23/10/85 to 5/11/85

叶绿素分析所用的水样子样，采集自多数第一航次段站位的上层150米水体样品。除未分级子样（即总种群）外，部分子样通过10μm与22μm筛网进行粒径分级，以估算网采浮游植物（net phytoplankton，>10μm）、微型浮游植物（nano-phytoplankton，10-2μm）及超微型浮游植物（pico-phytoplankton）的贡献占比。对应表层辐照度2%与0.5%的水层深度通常超过120米。曾记录到一次赛氏盘（Secchi disk）透明度为47米；在常规良好观测条件下，赛氏盘透明度通常介于35至40米之间。
在每个生产力站位每日开展两次重复垂直浮游动物拖网（网目尺寸60μm），以估算真光层（euphotic zone）内的浮游动物生物量与群落结构。另在夜间开展少量拖网，以对比昼夜变化。
本调查实施于1985年第5次富兰克林号研究船（RV Franklin）航次的第1、2航次段：
航次段1：1985年10月1日至10月21日
航次段2：1985年10月23日至11月5日