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| EVIDENCE FOR GENERAL INSTABILITY OF PAST CLIMATE FROM A 250-KYR ICE-CORE RECORD |
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| Author(s): DANSGAARD W, JOHNSEN SJ, CLAUSEN HB, DAHLJENSEN D, GUNDESTRUP NS, HAMMER CU, HVIDBERG CS, STEFFENSEN JP, SVEINBJORNSDOTTIR AE, JOUZEL J, BOND G |
| Source: NATURE Volume: 364 Issue: 6434 Pages: 218-220 Published: JUL 15 1993 |
| Times Cited: 1,731 References: 26 |
| Abstract: RECENT results1,2 from two ice cores drilled in central Greenland have revealed large, abrupt climate changes of at least regional extent during the late stages of the last glaciation, suggesting that climate in the North Atlantic region is able to reorganize itself rapidly, perhaps even within a few decades. Here we present a detailed stable-isotope record for the full length of the Greenland Ice-core Project Summit ice core, extending over the past 250 kyr according to a calculated timescale. We find that climate instability was not confined to the last glaciation, but appears also to have been marked during the last interglacial (as explored more fully in a companion paper3) and during the previous Saale-Holstein glacial cycle. This is in contrast with the extreme stability of the Holocene, suggesting that recent climate stability may be the exception rather than the rule. The last interglacial seems to have lasted longer than is implied by the deep-sea SPECMAP record4, in agreement with other land-based observations5,6. We suggest that climate instability in the early part of the last interglacial may have delayed the melting of the Saalean ice sheets in America and Eurasia, perhaps accounting for this discrepancy. |
| Document Type: Article |
| Language: English |
| Reprint Address: DANSGAARD, W (reprint author), UNIV COPENHAGEN, NIELS BOHR INST, DEPT GEOPHYS, HARALDSGADE 6, DK-2200 COPENHAGEN, DENMARK |
Addresses:
1. UNIV ICELAND, DEPT GEOPHYS, INST SCI, IS-107 REYKJAVIK, ICELAND
2. CTR ETUD SACLAY, DSM, CEA, MODELISAT CLIMAT & ENVIRONM LAB, F-91191 GIF SUR YVETTE, FRANCE
3. LAB GLACIOL & GEOPHYS ENVIRONM, F-38402 ST MARTIN DHERES, FRANCE
4. COLUMBIA UNIV, LAMONT DOHERTY GEOL OBSERV, PALISADES, NY 10964 USA |
| Publisher: MACMILLAN MAGAZINES LTD, PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW |
| Subject Category: Multidisciplinary Sciences |
| IDS Number: LM683 |
| ISSN: 0028-0836 |
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| | | | | | | | | Record from Web of Science® | | | | | | | | | |