Snow, sea ice, slush, brine and seawater: Oxygen isotopic ratio data from the SIPEX II voyage of the Aurora Australis, 2012

During the ice stations, sea ice, brine/slush, snow and under-ice water sampling were collected for oxygen isotopic ratio. Ice cores were collected using a Kovacs 9 cm diameter ice corer. The ice core for oxygen isotopic ratio was cut directly after retrieval with a stainless steel folded saw. The core was cut generally into 10 cm sections (20 cm when ice cores were higher than 200 cm) and put into zip-lock polyethylene bags. Care was taken to use laboratory gloves when collecting the cores. For brine sampling, partial core holes were drilled into the ice (so called sackholes), usually to a depth of 25 cm and 50 cm. At site with flooding, brine collection was not possible, and samples of the surface slush were collected instead. Slush was collected by plastic shovel. Snow samples were also collected. Under-ice water was collected with a Teflon water sampler (GL Science Inc., Japan) 1, 3, 5 m below the bottom of the sea ice. In addition, CTD water sampling was examined at each station. The cores were taken back to the ship, and transferred to the gas tight bag (GL Science Inc., Japan), and then ice was melted at about +4 degrees C in a refrigerator. Melted samples were sub-sampled for each component. The snow samples were treated in the same manner as the sea ice samples for further analysis. Oxygen isotopic ratio was determined with a mass spectrometer (DELTA plus; Finnigan MAT, USA) in Hokkaido University. Oxygen isotopic ratio in per mil (parts per thousand) was defined as the deviation of H2 18O/H2 16O ratio of the measured sample to that of the standard mean ocean water (SMOW). The precision of oxygen isotopic ratio analysis from duplicate determinations is plus or minus 0.02 parts per thousand (Toyota et al., 2007). Data available: excel files containing sampling station name, dates, and oxygen isotopic ratio.

在冰站作业期间，采集了海冰、卤水/融雪浆、积雪及冰下水样，用于氧同位素比值（oxygen isotopic ratio）分析。
冰芯采用直径9cm的Kovacs冰钻采集。用于氧同位素比值分析的冰芯在回收后立即使用不锈钢折叠锯进行切割。冰芯通常被切割为10cm的小段（若冰芯长度超过200cm则切割为20cm小段），随后装入自封聚乙烯袋中。采集冰芯过程中需全程佩戴实验室手套。
卤水采样时，需在冰体上钻取部分冰孔（即所谓袋孔），钻孔深度通常为25cm与50cm。若冰面存在积水，则无法采集卤水样品，此时改为采集表层融雪浆样品。融雪浆使用塑料铲采集。同时采集积雪样品。
冰下水样使用特氟龙（Teflon）材质采水器（GL Science Inc., 日本）在海冰底部下方1m、3m、5m处采集。此外，各冰站均开展温盐深仪（CTD）水样采样分析。
采集的冰芯被运回科考船，转移至气密袋（GL Science Inc., 日本）中，随后置于约4℃的冰箱内融化。融化后的样品按不同组分进行分样。积雪样品的后续分析处理流程与海冰样品一致。
氧同位素比值在北海道大学使用质谱仪（DELTA plus；Finnigan MAT，美国）进行测定。以千分比（‰）表示的氧同位素比值，定义为待测样品的H₂¹⁸O/H₂¹⁶O比值与标准平均海水（Standard Mean Ocean Water）的该比值之差。平行测定的氧同位素比值分析精度为±0.02‰（Toyota等，2007）。
可用数据集为包含采样站名称、采样日期及氧同位素比值的Excel文件。