Subantarctic Zone photos of sediment trap samples

SAZ photos of sediment trap samples

Sediment traps are cones which intercept and store falling marine particles in collection cups. The particles consist of a range of material including phytoplankton, zooplankton, faecal pellets, and dust. Each trap collects a time series of samples. The sediment traps are from deep moorings in the Southern Ocean, typically at 47S, 54S, and 61S and at around 140 degrees East. Each mooring typically has 2-3 traps between 800m and 3800m below sea-level.
The samples are size fractionated into less than 1mm and greater than 1mm fractions using a 1mm sieve. Various chemical analyses and observations have been made on the less than 1mm fraction.

These are photos are of greater than 1mm fraction, mainly showing 'swimmers.'
Photos are mostly taken on the sieve, so the grid is 1mm for scale.
Sample identification is in the file name, and also in a label in the photo.
The file name format is:
Typical example s02_54_800_04.jpg
1) s02: s is for SAZ. Collection season number is first year of collection season. So s02 is from SAZ 2002-2003.
2) 54: Nominal latitude.
3) 800: Nominal depth, m.
4) 04: Cup number, typically 1-21 or 1-13, single digit numbers padded with a zero to help operating systems display files in order.
5) .jpg: All photos are in jpeg format

Some files have additional information at end, examples below:
* FP: faecal pellet
* begin and end: beginning and end of sieving process. Mostly to show faecal pellets at start that are rinsed through sieve.

This work was completed as part of ASAC project 1156 (ASAC_1156). See also the metadata record 'Subantarctic Zone (SAZ) Sediment Trap Moorings' (SAZOTS).

南极辐合带以南海域（Subantarctic Zone, SAZ）沉积物捕获器样品照片

沉积物捕获器为锥形装置，用于截留并储存沉降至收集杯中的海洋颗粒物质。此类颗粒包含多种组分，涵盖浮游植物、浮游动物、粪球粒及尘埃等。每台捕获器可采集时间序列样品。本次数据集的沉积物捕获器布放于南大洋深层锚系站位，典型站位坐标为南纬47°、54°、61°，东经约140°。每套锚系通常布放2~3台捕获器，布设水深介于海面下800米至3800米之间。

样品通过1毫米孔径筛网被分为<1mm和>1mm两个粒级组分。研究人员已针对<1mm粒级组分开展了多项化学分析与观测。本次提供的照片均对应>1mm粒级组分，主要展示其中的游泳类生物。

照片大多拍摄于筛网之上，因此筛网的网格可作为1毫米的比例尺。样品的标识信息既包含在文件名中，也标注于照片内。文件名格式示例如下：s02_54_800_04.jpg（典型示例）。
各字段含义如下：
1) s02：前缀"s"代表SAZ（南极辐合带以南海域），采集季编号为采集季的首年，因此s02对应2002-2003年SAZ海域的采集样品。
2) 54：名义纬度。
3) 800：名义水深，单位为米。
4) 04：收集杯编号，通常取值范围为1~21或1~13，个位数编号前补零以确保操作系统可按顺序正确显示文件。
5) .jpg：所有照片均采用JPEG格式存储。

部分文件名末尾带有附加信息，示例如下：
* FP：代表粪球粒
* begin与end：分别表示筛分流程的开始与结束阶段，主要用于展示筛分初始阶段被冲洗过筛网的粪球粒。

本数据集的相关工作为ASAC第1156号项目（ASAC_1156）的一部分。亦可参考元数据记录《南极辐合带以南海域沉积物捕获器锚系》（Subantarctic Zone (SAZ) Sediment Trap Moorings, SAZOTS）。