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| Barker, Stephen; Knorr, Gregor. |
| A numerical algorithm is applied to the Greenland Ice Sheet Project 2 (GISP2) dust record from Greenland to remove the abrupt changes in dust flux associated with the Dansgaard-Oeschger (D-O) oscillations of the last glacial period. The procedure is based on the assumption that the rapid changes in dust are associated with large-scale changes in atmospheric transport and implies that D-O oscillations (in terms of their atmospheric imprint) are more symmetric in form than can be inferred from Greenland temperature records. After removal of the abrupt shifts the residual, dejumped dust record is found to match Antarctic climate variability with a temporal lag of several hundred years. It is argued that such variability may reflect changes in the source... |
| Tipo: Text |
Palavras-chave: Dansgaard-Oeschger events; Rapid climate change; GISP2 dust record. |
| Ano: 2007 |
URL: https://archimer.ifremer.fr/doc/00235/34643/33010.pdf |
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| Knutz, Paul C.; Zahn, Rainer; Hall, Ian R.. |
| Evidence from paleoclimatic archives suggests that Earth's climate experienced rapid temperature changes associated with pronounced interhemispheric asymmetry during the last glacial period. Explanations for these climate excursions have converged on nonlinear interactions between ice sheets and the ocean's thermohaline circulation, but the driving mechanism remains to be identified. Here we use multidecadal marine records of faunal, oxygen isotope, and sediment proxies from the northeast Atlantic proximal to the western margins of the last glacial British Ice Sheet (BIS) to document the coupling between ice sheet dynamics, ocean circulation, and insolation changes. The core data reveal successions of short-lived (80-100 years), high-amplitude ice-rafted... |
| Tipo: Text |
Palavras-chave: Ice sheet variability; Rapid climate change; North Atlantic overturning circulation. |
| Ano: 2007 |
URL: https://archimer.ifremer.fr/doc/00233/34437/32940.pdf |
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