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| ELECTRICAL-CONDUCTIVITY MEASUREMENTS FROM THE GISP2 AND GRIP GREENLAND ICE CORES |
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| Author(s): TAYLOR KC, HAMMER CU, ALLEY RB, CLAUSEN HB, DAHLJENSEN D, GOW AJ, GUNDESTRUP NS, KIPFSTUHL J, MOORE JC, WADDINGTON ED |
| Source: NATURE Volume: 366 Issue: 6455 Pages: 549-552 Published: DEC 9 1993 |
| Times Cited: 150 References: 36 |
| Abstract: THE direct-current electrical conductivity of glacial ice depends on its acidity1-3, and can also indicate changes in climate, as ice formed in cold, dusty periods has a high concentration of alkaline dust1,4,5, which significantly reduces the conductivity6,7 compared to warmer, less dusty periods. Here we present electrical conductivity records for the Greenland Ice Sheet Project 2 (GISP2) and Greenland Ice-core Project (GRIP) ice cores, drilled 28 km apart to enable direct comparison of the results. The upper parts of both records are consistent with previous evidence from other Greenland cores4,8-12 for a stable Greenland climate during the Holocene, and a series of warm events punctuating the last glacial period. However, there is a significant discrepancy between the two records in the bottom 10% of the cores, calling into question recent reports of climate variability in the last interglacial4,8 and the penultimate glaciation8. At this stage, it is too early to say what exactly is causing the discrepancy, although ice flow may have introduced some discontinuities into the records. Further work will be necessary to establish how much climatic information it will eventually be possible to extract from the lower parts of the two cores. |
| Document Type: Article |
| Language: English |
| Reprint Address: TAYLOR, KC (reprint author), UNIV NEVADA, DESERT RES INST, BOX 60220, RENO, NV 89506 USA |
Addresses:
1. UNIV COPENHAGEN, NIELS BOHR INST ASTROM PHYS & GEOPHYS, DEPT GEOPHYS, DK-2200 COPENHAGEN, DENMARK
2. PENN STATE UNIV, CTR EARTH SYST SCI, UNIV PK, PA 16802 USA
3. PENN STATE UNIV, DEPT GEOSCI, UNIV PK, PA 16802 USA
4. COLD REG RES LAB, HANOVER, NH 03755 USA
5. ALFRED WEGENER INST POLAR & MARINE RES, D-27568 BRENERHAVEN, GERMANY
6. UNIV LAPLAND, ARCTIC CTR, SF-96101 ROVANIEMI, FINLAND
7. BRITISH ANTARCTIC SURVEY, CAMBRIDGE CB3 0ET, ENGLAND
8. UNIV WASHINGTON, GEOPHYS PROGRAM AK50, SEATTLE, WA 98195 USA |
| Publisher: MACMILLAN MAGAZINES LTD, PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW |
| Subject Category: Multidisciplinary Sciences |
| IDS Number: ML218 |
| ISSN: 0028-0836 |
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| | | | | | | | | Record from Web of Science® | | | | | | | | | |