Phytoplankton Data Collected During CPR Tows of the Southern Ocean - Australian Antarctic Division Copy

Data are "phytoplankton counts" for each phytoplankton taxon observed, from the CPR samples collected by the Southern Ocean CPR Survey projects 472 and 4107 (Hosie et al. 2003). The SAHFOS on-silk phytoplankton count method is used (Batten et al. 2003). Phytoplankton are identified to the best taxonomic level possible, ideally to species or at least genus, in 20 fields of view (295 plus or minus 10 microns) per sample (section of silk). See Figure 2 of Batten et al. (2003). Each sample usually represents 5 nautical miles for SO-CPR. The "phytoplankton count" is the number of fields of view where a phytoplankton species/ taxon was observed, recorded for each taxon for each sample. It is effectively a frequency of occurrence score.The CPR is a device towed at normal ship speed, approximately 100 m behind the ship at a depth of 8-10 m. Plankton enter a small aperture 12.7 x 12.7 mm which then expands into a tunnel 100 x 50 mm reducing the speed by about 1/30. Plankton are then sandwiched between two sheets of 270 micron silk gauze, before rolling into a preservation tank of formaldehyde. Each tow is approximately 450 nautical miles. Regardless of ship speed the silk advances at a fixed rate of about 1 cm per nautical mile. Silks are cut into 5 nautical mile equivalent lengths and both phyto- an zooplankton are counted. Each sample is coded with time and date (GMT) and latitude and Longitude, plus averaged environmental data over the 5 nautical miles, e.g. water temperature, salinity, fluorescence, light. Zooplankton data and methods are described in Metadata record AADC-00099.AbbreviationsCPR, Continuous Plankton RecorderSAHFOS, Sir Alister Hardy Foundation for Ocean ScienceSO-CPR , Southern Ocean CPR Survey

本数据集的核心内容为南大洋连续浮游生物记录仪（Continuous Plankton Recorder，简称CPR）调查项目472与4107（Hosie等，2003）采集的CPR样本中，各观测浮游植物类群的浮游植物计数（phytoplankton counts）数据。实验采用海洋科学阿尔斯特·哈迪基金会（Sir Alister Hardy Foundation for Ocean Science，简称SAHFOS）的丝膜浮游植物计数法（Batten等，2003）。

每个样本（即一段丝膜样品）需在20个视野（视野尺寸为295±10微米）下完成分类鉴定，尽可能达到最优分类阶元，理想情况下可鉴定至种级，至少应达到属级。详细方法可参见Batten等（2003）的图2。针对南大洋CPR调查（SO-CPR），每个样本通常对应5海里的采样航程。

此处的浮游植物计数指单个样本中，某一浮游植物物种/类群被观测到的视野总数，针对每个类群分别记录，本质上为该类群的出现频率得分。

CPR采样装置以常规航速拖曳，通常布放于船尾约100米处、水深8-10米的水层。浮游生物通过12.7×12.7毫米的小型入口进入装置，随后进入100×50毫米的流速减缓通道，流速被降低至原速的1/30左右。浮游生物随后被夹在两层270微米孔径的丝膜之间，随后卷绕进入甲醛保存罐。

单次拖曳采样航程约为450海里。无论航速如何，丝膜的前进速率固定为约1厘米每海里。丝膜会被切割为对应5海里航程的长度，并分别计数浮游植物与浮游动物。每个样本均附带GMT时间与日期、经纬度坐标，以及对应5海里航程内的平均环境数据，例如水温、盐度、荧光值与光照强度。浮游动物的相关数据与实验方法可参见元数据记录AADC-00099。

缩写说明：
CPR：连续浮游生物记录仪（Continuous Plankton Recorder）
SAHFOS：海洋科学阿尔斯特·哈迪基金会（Sir Alister Hardy Foundation for Ocean Science）
SO-CPR：南大洋CPR调查（Southern Ocean CPR Survey）