Ages and ablation and accumulation rates from super(1) super(4) C measurements on Antarctic ice

Shallow ice cores from an Antarctic blue-ice area at Scharffenberg-botnen were super(1) super(4) C-analyzed using a dry-extraction technique and accelerator mass spectrometry. The in situ production was determined from the super(1) super(4) CO component and used to deduce the natural super(1) super(4) CO sub(2) component. The ages were measured at 10 000 plus or minus 3000 B P . The accumulation and ablation rates determined from the in situ production are 7-20 and 10 cm a super(-) super(1) , respectively, showing agreement with field observations. The derived ages and air-yield data show a nearby origin for the surface ice.