7 year oxygen isotope results from samples taken on Antarctic Plateau traverse, 1984

A total of nine stations were sampled for oxygen isotopes during the 1984 spring traverse to the Antarctic Plateau. The aim of this program was to take a number of samples from a core or a pit, at stations of known accumulation over a particular period, to see how far inland the annual cycles could accurately be traced. The samples were not taken at ice movement stations, but at canes each 2km along the line, to avoid sampling the accumulation, and thus isotope disturbance resulting from parking the vans beside the IMS poles in 1978 and 1979.The accumulation for the cane at each sampled station was calculated for the six years since 1978, and the total multiplied by 7/6 to give the sampling depth required to cover 7 years. Seventy samples were taken at each station, i.e. approximately 10 per year. At most stations a PICO drill was used to obtain a core, and the samples cut with a stainless steel knife on the stainless sink in the living van. At the southern end of the line where the accumulation is much lower, the samples were taken from the wall of a pit, as the small length of core for each sample did not provide enough melt. The snow was sampled in the pits by sliding a flat sheet of galvanized iron into the snow at each interval starting at the top, and scraping the snow above this into a melt jar. Isotopic contamination of samples from both these methods should be negligible. All samples were melted in plastic jars, and then transferred into 5Oml plastic bottles. A total of 630 samples from 9 stations were returned to Australia for oxygen isotope analysis, carried out in Melbourne by Ted Vishart, Dick Marriot, and Gao Xiangqun.The station/cane labels for the sample sites were:A028V140/4 (near GC30)V230/4 (near GC37)V270/1 (near GC38)V300/1 (near GC39)V350/1 (near GC40)V400/1 (near GC41)V450/1 (near GC42)V630/1 (near GC47)The columns in the spreadsheet are:Sequence NumberCore depth (metres)Oxygen isotope value (the number is a ratio of O18 per ml of O16, expressed as a percentage (but as parts per 1000 instead of 100))

1984年南极高原春季考察期间，共在9个站位开展氧同位素采样工作。本项目的目标为：在已知特定时段积雪积累量的站位，从冰芯或雪坑中采集若干样本，以探究年周期信号可被精准追溯至内陆的最远距离。本次采样未设于冰运动观测站，而是沿考察线每2km选取一处桩点（cane）进行采样，以此规避因1978至1979年间将科考车停靠于IMS极点周边区域所引发的积雪积累扰动与同位素信号干扰。
我们针对每个采样桩点，计算了1978年以来六年的积雪积累量，并将总积累量乘以7/6，以得到覆盖7年时长所需的采样深度。每个站位共采集70份样本，即年均约10份。
多数站位采用PICO钻机（PICO drill）获取冰芯，随后在科考车的不锈钢水槽上使用不锈钢刀具切割样本。在考察线南端，由于积雪积累量极低，单份冰芯样本的长度不足以提供足够的融雪量，因此改为从雪坑壁采集样本：通过将一块平整的镀锌铁板从雪坑顶部开始按固定间距插入积雪，将铁板上方的积雪刮入融样罐中完成采样。两种采样方式带来的同位素污染均可忽略不计。
所有样本均在塑料罐中融解，随后转移至50ml塑料瓶中。本次研究共从9个站位获取630份样本，将其运回澳大利亚，交由墨尔本的Ted Vishart、Dick Marriot与高翔群开展氧同位素分析。
样本点位的站位/桩点编号如下：
A028V140/4（靠近GC30）
V230/4（靠近GC37）
V270/1（靠近GC38）
V300/1（靠近GC39）
V350/1（靠近GC40）
V400/1（靠近GC41）
V450/1（靠近GC42）
V630/1（靠近GC47）
电子表格中的各列依次为：
序列编号、冰芯深度（米）、氧同位素值（该数值为每毫升O16中O18的占比，以千分比而非百分比表示）