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But even he “realized that there probably would be variation”, says Christopher Bronk Ramsey, a geochronologist at the University of Oxford, UK, who led the latest work, published today in Science.Various geologic, atmospheric and solar processes can influence atmospheric carbon-14 levels.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).Neither the principal investigators nor CDIAC is responsible for misuse of these data. At the Bern laboratory, four to six samples of approximately 8 grams from each depth level (0.55m intervals) in the ice core are crushed under vacuum conditions.To send this article to your Kindle, first ensure [email protected] added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Note you can select to send to either the @free.or @variations.Then enter the ‘name’ part of your Kindle email address below. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi.‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.Find out more about the Kindle Personal Document Service.
If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies.In a first successful application, the method was used to obtain age constraints for an ice core from the cold, high Alpine firn saddle Colle Gnifetti (Switzerland).Analysis of the bottom ice core sections revealed a basal age of 4171–3923 cal yr BP but also a so far enigmatic discontinuity in the age-depth relationship.The sample container is connected to a cold trap for several minutes to release 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 CO-in-air standard gas of 251.65 parts per million by volume (ppmv) scaled on the WMO mole fraction scale.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.