Dating antarctic ice cores

To assure proper credit is given, please follow the citation instructions in the headers of the data files and/or at the end of this page when using any of this material.If data accessed from this site are to be used in a publication, we strongly recommend some contact with the principal investigators to be sure the data are being interpreted and used correctly. Maps of Antarctica showing locations and elevations in meters above sea level (masl) of: Law Dome (66°44'S, 112°50'E, 1390 masl), Dome C (75°06'S, 123°24'E, 3233 masl), Taylor Dome (77°48'S, 158°43'E, 2365 masl), Vostok (78°28'S, 106°52'E, 3500 masl), Dome A (80°22'S, 77°22'E, 4084 masl), the South Pole station (90°S, 2810 masl), and Siple Station (75°55'S, 83°55'W, 1054 masl).Ice cores contain information about past temperature, and about many other aspects of the environment.

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In fact the clearest dating is obtained when several seasonal signals are examined and compared.1 overleaf), although we do have to be cautious, as artefacts can arise at sites with high concentrations of other impurities.was stable over the last millennium until the early 19th century. isotopic data) confirm that the increase must be due to emissions of CO from fossil fuel usage and deforestation.In an Antarctic core (Law Dome) with a very high snowfall rate, it has been possible to measure concentrations in air from as recently as the 1980s that is already enclosed in bubbles within the ice.Comparison with measurements made at South Pole station show that the ice core acts as a faithful recorder of atmospheric concentrations (see Fig.Analysis of the physical and chemical properties of an ice core can reveal past variations in climate ranging from seasons to hundreds of thousands of years.Ice core records can be used to reconstruct temperature, atmospheric circulation strength, precipitation, ocean volume, atmospheric dust, volcanic eruptions, solar variability, marine biological productivity, sea ice and desert extent, and forest fires.Slices of ice core, drilled from the depths of the Earth’s ice sheets, reveal details of the planet’s past climate.Ice cores are cylinders of ice drilled out of an ice sheet or glacier.) can be used to identify input from volcanic sources.The 1815 Tambora Eruption, responsible for the “year without a summer”, is a commonly used “dating horizon” that has been found in ice cores around the Earth.

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