Soluble Impurities in Four Antarctic Ice Cores Over the Last 30 000 Years
| Autor: | Michel R. Legrand, Robert J. Delmas |
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| Rok vydání: | 1988 |
| Předmět: | |
| Zdroj: | Annals of Glaciology. 10:116-120 |
| ISSN: | 1727-5644 0260-3055 |
| DOI: | 10.3189/s0260305500004274 |
| Popis: | The chemical composition of soluble impurities along the Dome C ice core covering approximately the last 30 000 years is reported and interpreted in terms of atmospheric contributions. Terrestrial and sea-salt inputs are known to have been much higher during the Last Glacial Maximum (LGM) than during the Holocene period. For this reason, the gas-derived compounds (mainly H2SO4 and HNO3) which dominate the chemistry of present-day snow are minor components in LGM snow. The exact calculation of each of the various contributions has been made possible by the determination of all major ions (H+, Na+, K+, NH4+, Mg2+, Ca2+, NO3−, SO42− and Cl−) in the samples. Three additional deep ice cores from other Antarctic areas have also been analyzed, but in a less comprehensive manner than the Dome C core. The differences observed at the four study sites increase the general understanding of the past atmospheric chemistry of the Southern Hemisphere. |
| Databáze: | OpenAIRE |
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