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| IRREGULAR GLACIAL INTERSTADIALS RECORDED IN A NEW GREENLAND ICE CORE |
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| Author(s): JOHNSEN SJ, CLAUSEN HB, DANSGAARD W, FUHRER K, GUNDESTRUP N, HAMMER CU, IVERSEN P, JOUZEL J, STAUFFER B, STEFFENSEN JP |
| Source: NATURE Volume: 359 Issue: 6393 Pages: 311-313 Published: SEP 24 1992 |
| Times Cited: 759 References: 25 |
| Abstract: THE Greenland ice sheet offers the most favourable conditions in the Northern Hemisphere for obtaining high-resolution continuous time series of climate-related parameters. Profiles of O-18/O-16 ratio along three previous deep Greenland ice cores1-3 seemed to reveal irregular but well-defined episodes of relatively mild climate conditions (interstadials) during the mid and late parts of the last glaciation, but there has been some doubt as to whether the shifts in oxygen isotope ratio were genuine representations of changes in climate, rather than artefacts due to disturbed stratification. Here we present results from a new deep ice core drilled at the summit of the Greenland ice sheet, where the depositional environment and the flow pattern of the ice are close to ideal for core recovery and analysis. The results reproduce the previous findings to such a degree that the existence of the interstadial episodes can no longer be in doubt. According to a preliminary timescale based on stratigraphic studies, the interstadials lasted from 500 to 2,000 years, and their irregular occurrence suggests complexity in the behaviour of the North Atlantic ocean circulation. |
| Document Type: Article |
| Language: English |
| Reprint Address: JOHNSEN, SJ (reprint author), UNIV COPENHAGEN, INST GEOPHYS, HARALDSGADE 6, DK-2200 COPENHAGEN, DENMARK |
Addresses:
1. CENS, CEA, DSM, MODELISAT CLIMAT & ENVIRONM LAB, F-91191 GIF SUR YVETTE, FRANCE
2. UNIV REYKJAVIK, INST SCI, IS-107 REYKJAVIK, ICELAND
3. UNIV BERN, INST PHYS, CH-3012 BERN, SWITZERLAND
4. LAB GLACIOL & GEOPHYS ENVIRONNEMENT, F-38402 ST MARTIN DHERES, FRANCE |
| Publisher: MACMILLAN MAGAZINES LTD, PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW |
| Subject Category: Multidisciplinary Sciences |
| IDS Number: JP503 |
| ISSN: 0028-0836 |
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