Southern Ocean Time Series (SOTS) - Phytoplankton Abundance and Biovolume

This dataset comprises the phytoplankton abundance and biovolume estimates as part of a broader sampling program carried out at the Southern Ocean Time Series, a facility within the Integrated Marine Observing System (IMOS). The primary focus is sustained observing of ocean properties and processes important to climate, carbon cycling, and ocean productivity. Regular phytoplankton samples are collected at approximately 14 day intervals (exact intervals and seasonal coverage dependent on deployment length). The moorings are serviced annually, at which time the existing moorings are recovered and new moorings are deployed. Water samples from within the surface mixed-layer are collected at pre-programmed intervals using a Remote Access Sampler, in pairs about 1 hour apart. One sample in each pair is preserved for phytoplankton community composition by microscopy, and the other sample is preserved and used for accompanying chemical analysis of nutrients, total dissolved inorganic carbon (DIC) and alkalinity.
Each sample is collected from within the surface mixed-layer at 32 m depth (2010 - 2017) or 5 m depth (2018-current) depending on the design of the mooring surface assembly and instrumentation. Typically a maximum of 24 samples are collected over an annual deployment cycle. The samples collected are analysed for: 1. Community composition / abundance (cells/L) 2. calculated biovolume (um3/L). Protocols for the phytoplankton time-series are described in Eriksen et al (2018), and the annual sample reports for each deployment.
Data storage and access is planned to be interoperable with other national and international programs through the IMOS Infrastructure. Station metadata can be found through this resource. Data is available freely via the AODN portal: https://portal.aodn.org.au. As the taxonomic resolution of the data has changed over time, due to continual training, it is important that users refer to the change log tables included in your data download. These will provide information on the validity of the taxa, from what date we have been identifying certain taxa etc. Classification fields may be blank depending on the level to which that taxa has been identified, i.e. if only identified to family, genus and species will be blank.

本数据集隶属于综合海洋观测系统（Integrated Marine Observing System, IMOS）旗下的南大洋时间序列观测站（Southern Ocean Time Series）的大型采样计划，包含浮游植物丰度与生物体积估算数据。该观测计划的核心目标是长期持续观测与气候、碳循环及海洋生产力密切相关的海洋属性与过程。
浮游植物样品的常规采集周期约为14天（具体间隔与季节覆盖范围取决于部署时长）。该观测锚系每年开展一次维护作业，期间回收原有锚系并部署全新锚系。
研究人员采用远程存取采样器（Remote Access Sampler）按照预设间隔采集表层混合层水样，采样以配对形式进行，两组采样间隔约1小时。每对采样中的一份样品会被固定，用于显微镜分析浮游植物群落组成；另一份样品同样经过固定，用于后续的营养盐、总溶解无机碳（total dissolved inorganic carbon, DIC）及碱度配套化学分析。
所有样品均采集自表层混合层，采样深度根据锚系水面组件与仪器的设计方案分为两类：2010年至2017年为32米，2018年至今为5米。在单次年度部署周期内，通常最多可采集24份样品。所采集的样品将开展两项分析：1. 群落组成与丰度（单位：cells/L）；2. 计算得到的生物体积（单位：μm³/L）。浮游植物时间序列观测的实验方案详见Eriksen等人2018年的研究成果，以及各次部署的年度样品报告。
本数据集计划通过IMOS基础设施实现与其他国内外观测计划的数据存储与访问互操作性。观测站元数据可通过本资源获取。数据集可通过澳大利亚海洋数据门户（Australian Ocean Data Network Portal, AODN portal）免费获取，访问地址为：https://portal.aodn.org.au。
由于持续的分类学培训优化，本数据集的分类学分辨率随时间推移有所调整，因此用户务必查阅数据下载包中附带的变更日志表。该日志表将提供有关物种分类单元有效性的相关信息，包括特定分类单元的正式识别起始日期等内容。分类字段可能存在空白，具体取决于该分类单元的鉴定层级：若仅鉴定至科级别，则属、种字段均为空白。