A correction for in-situ (super 14) C in Antarctic ice with (super 14) CO

• Main Authors: van Roijen, Job, van der Borg, Klaas, de Jong, Arie, Oerlemans, Johannes
• Format: Article in Journal/Newspaper
• Language: English
• Published: Radiocarbon 1995
• Subjects: ablation;ice;corrections;Antarctica;hydrology;carbon monoxide;ice cores;in situ;Holocene;Cenozoic;Quaternary;methods;C 14;carbon;dates;isotopes;radioactive isotopes;carbon dioxide;absolute age; Antarctic; East Antarctica; Antarc*; Antarctica
• Online Access: https://journals.uair.arizona.edu/index.php/radiocarbon/article/view/1660

We use a dry extraction method to obtain trapped CO2 of shallow ice cores from a blue ice area of East Antarctica. In-situ-produced 14C extracted in 14C02 and 14C0 concentrations show a mean ratio of 3.4 ± 0.4. Correction for insitu 14C02 resulted in ice ages within 7-13 ka. The accumulation and ablation rates determined from the in-situ production of 7-20 cm yr-1 and 10-13 cm yr-1, respectively, agree with field measurements, and thus indicate close to total efficiency of extraction.