A sample with an order
Drilling an ice sheet produces a long sequence of material, rather than a single loose specimen. Ice cores contain clues to past environments, including small bubbles of trapped air. Those bubbles allow researchers to measure past concentrations of gases such as carbon dioxide and methane. [1]
Reading a longer record
The earlier EPICA drilling at Dome C produced a climate record extending back about 800,000 years. British Antarctic Survey described that achievement when discussing plans for a later drilling campaign in 2019. Here, the figure refers to that historical EPICA record; it is not a claim about the oldest ice available today. [2]
The archive needs interpretation
A core is useful because physical material remains available for measurement. But a sample is not a complete replay of an environment. Researchers must consider how information was preserved and whether impurities can affect a measurement. On the board, compare this approach with the Bennu sample: both use material to investigate an inaccessible past, while preserving very different kinds of evidence. That connection is an editorial comparison, not a claim that the projects used identical methods. [1, 2]
Source notes
Numbers in the text refer to these sources. This is an editorial account, not a first-hand expedition report.
- British Antarctic Survey · Ice cores and climate change (historical briefing)
- British Antarctic Survey · EPICA context and site selection (2019)
Board connections are editorial comparisons and cite the evidence they use. They are distinct from your personal notes.
Editorial Standards: sources, illustrations and corrections ↗Written and source-checked: 12 November 2026.