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The sample container is connected to a cold trap for several minutes to carbon dating ice samples air from the clathrates and the air is then expanded to a measuring cell where a laser measures absorption in a vibration—rotation transition line of the CO2 molecule. Calibration is done using a CO2-in-air standard gas of At Grenoble Laboratory of Glaciology, Geophysics and Environment one to three ice samples of about 40 grams each are crushed under vacuum conditions, and after about 20 minutes the extracted gas is expanded in the sample loop of a gas chromatograph and analyzed.
Depending on the amount of extracted air, three to five successive analyses are done.
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Uncertainty is a few ppmv; measurement error for the Bern laboratory is given in the data file, and the Grenoble Lab generally carbons dating ice samples within a few ppmv for the common time interval. The most recent "EDC3" chronology is based on a snow accumulation and mechanical flow model combined with a set of independent age markers along the core, indicating either well-dated paleoclimatic records or insolation variations.
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The Vostok time scale is based on the the "GT4" chronology, derived in a carbon dating ice fashion to "EDC3" with age constraints at thousand and at thousand years ago which are assumed to match known events in sample sediments.
Trends Over the lastyears atmospheric CO2 levels as indicated by the ice-core data have fluctuated between and parts per million by volume ppmvcorresponding with conditions of glacial and interglacial periods. The Vostok core indicates very similar trends.
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Prior to aboutyears before present time BP atmospheric CO2 levels were always at or below ppmv and reached lowest values, approaching ppmv, betweenandyears ago. The highest pre-industrial value recorded inyears of ice-core record was References Barnola, J. Eight glacial cycles from an Antarctic ice core. High-resolution carbon dioxide concentration record , years before present.
the ice revealed atmospheric carbon dioxide (CO2) levels that did not Ice cores from Greenland and Antarctica are mainstays of modern of the annual layers-making it impossible to date the ice by counting them. This page introduces Antarctic ice-core records of carbon dioxide (CO2) that now a set of independent age markers along the core, indicating either well-dated.
Climate of the Past 3: Department of Energy". Also cite the reference to Luthi et al. If using the data for a published work, cite the original "original reference" to Petit et al.
If using the shorter records of Barnola et al. If using the records of Fisher et al.
Instructions for the World Data Center material are given in the headers of the data files.