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An ice core is a core sample that is typically removed from an ice sheet or a high mountain glacier. Since the ice forms from the incremental buildup of annual layers of snow, lower layers are older than upper ones, and an ice core contains ice formed over a range of years. Cores are drilled with hand augers (for shallow holes) or powered drills; they…
History & Measurement
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ice core cores drilling years snow used greenland layers drill also depth since hole drilled data antarctica surface 000 temperature
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Ice core | is a | core sample that is typically removed from an ice sheet or a high mountain glacier | 0.90 | text |
| Ice core | is a | vertical column through a glacier | 0.90 | text |
| carbon dioxide | instance of | and the air trapped in tiny bubbles can be analysed to determine the level of atmospheric gases | 0.80 | text |
| beryllium-10 created by cosmic rays | instance of | isotopes | 0.80 | text |
| Antarctica | instance of | it often does not retain stratigraphic information.Cores are often drilled in areas | 0.80 | text |
| central Greenland where the temperature is almost never warm enough to cause melting | instance of | it often does not retain stratigraphic information.Cores are often drilled in areas | 0.80 | text |
| but the summer sunlight can still alter the snow | instance of | it often does not retain stratigraphic information.Cores are often drilled in areas | 0.80 | text |
| periodicities in the earth's orbital parameters.A difficulty in ice core dating is that gases can diffuse through firn | instance of | Another method is to correlate radionuclides or trace atmospheric gases with other timescales | 0.80 | text |
| so the ice at a given depth may be substantially older than the gases trapped in it | instance of | Another method is to correlate radionuclides or trace atmospheric gases with other timescales | 0.80 | text |
| CH 4 | instance of | measurements of gases | 0.80 | text |
| past mean ocean temperatures | instance of | and determine other palaeoclimatic information | 0.80 | text |
| helium can rapidly diffuse through ice | instance of | Some gases | 0.80 | text |
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