Ice station documentation from expedition SAS, Arctic Ocean, 2021

The dataset contains metadata and 353 files with photographs and field notes from the ice stations visited during the Synoptic Arctic Survey (SAS) 2021 expedition with the Swedish icebreaker Oden in summer 2021.

Altogether, 316 ice cores, as well as water samples (melt ponds, brackish brine, ice-seawater interface) and snow samples were taken at 16 ice stations during the expedition. These ice-station samples were used for measuring temperature (immediately after sampling in the field), salinity (on-board) and inorganic nutrients (on-board), and to later analyze particulate carbon, nitrogen and phosphorus, stable isotopes (¹³C and ¹⁵N), chlorophyll-a, pigment composition (chlorophylls and carotenoids), meiofauna community composition (microscopy, DNA), microbial community composition (metagenomics, DNA), microbial gene expression (metatranscriptomics, RNA) and diversity of multicellular organisms (environmental DNA).

Each ice core was documented by a photograph that can be used to study the structure of the 85⁠ – 305 cm thick sea ice, which may help explain differences in chemical and biological parameters between ice cores. Additional photographs document ice views and the gear used for sampling ice cores, water and snow. Furthermore, scans of the original ice-station field notes are provided as they may include some extra information about field conditions that is not available elsewhere.

该数据集汇聚了2021年夏季瑞典破冰船奥登号在北极综合考察（SAS 2021）期间对冰站进行考察所采集的图像资料、现场笔记的元数据以及353份文件。考察期间，在16个冰站共采集了316根冰芯，以及水体样本（融池、咸淡卤水、冰海水界面）和雪样。这些冰站样本被用于测量温度（现场采集后立即进行）、盐度（船上）和无机营养素（船上），并用于后续分析颗粒碳、氮和磷、稳定同位素（¹³C和¹⁵N）、叶绿素-a、色素组成（叶绿素和类胡萝卜素）、 meiofauna 社群组成（显微镜观察、DNA）、微生物群落组成（宏基因组学、DNA）、微生物基因表达（宏转录组学、RNA）以及多细胞生物的多样性（环境DNA）。每一根冰芯均附有照片，可用于研究厚度为85⁠ – 305 cm的海冰结构，这有助于解释冰芯间化学和生物参数的差异。此外，还提供了冰面景象和采样冰芯、水体和雪样所使用的设备的照片。同时，还提供了原始冰站现场笔记的扫描件，其中可能包含一些关于现场条件的信息，这些信息在其他地方无法获取。