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Ice core study from the King George Island, South Shetlands, Antarctica
| Content Provider | Semantic Scholar |
|---|---|
| Author | Simões, Jefferson Cardia Ferron, Francisco Adolfo Bernardo, Ronaldo Aristarain, Alberto J. Stievenard, Michel Pourchet, Michel Delmas, Robert J. Gonçalves, Bento Collares Saclay, Cea Agua, Geoquimica Del |
| Copyright Year | 2004 |
| Abstract | A 49.9-m firn-ice core recovered from the King George Island ice cap (690 m above sea level) in the summer of 1995–96 was analyzed for stable isotope composition and major anionic species. Borehole temperature was measured down to a depth of 45 m, indicating an ice cap near the pressure melting point; density measurements show a firn-ice transition at a depth of 35 m. The environmental record is homogenized due to intense superficial melting, followed by percolation and refreezing. The upper 2.7 m is considered representative of the original precipitation and provides reference for the background chemical composition in the South Shetlands (δD :− 72.2 ◦/◦◦ ,δ 18 O :− 9.7 ◦/◦◦ , Cl − : 120 µEq L −1 , SO −2 4 : 28 µEq L −1 , excessSO −2 4 : 15 µEq L −1 ). Stable isotope seasonal variations are recognized down to 15 m, allowing dating of the core. A simple Nye’s model was used to date the core below this depth, resulting in a mean net accumulation rate of 0.59 m a −1 (water equivalent) over 73 years of precipitation. Below 37 m, the environmental record |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://ftp.cnpq.br/pub/doc/proantar/pab-03.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
