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| Sha, Longbin; Jiang, Hui; Seidenkrantz, Marit-solveig; Muscheler, Raimund; Zhang, Xu; Knudsen, Mads Faurschou; Olsen, Jesper; Knudsen, Karen Luise; Zhang, Weiguo. |
| Arctic sea ice represents an important component of the climate system, and the present reduction of sea ice in the Arctic is of major concern. Despite its importance, little is known about past changes in sea-ice cover and the underlying forcing mechanisms. Here, we use diatom assemblages from a marine sediment core collected from the West Greenland shelf to reconstruct changes in sea-ice cover over the last millennium. The proxy-based reconstruction demonstrates a generally strong link between changes in sea-ice cover and solar variability during the last millennium. Weaker (or stronger) solar forcing may result in the increase (or decrease) in sea-ice cover west of Greenland. In addition, model simulations show that variations in solar activity not only... |
| Tipo: Text |
Palavras-chave: Sea-ice variability; Solar activity; West Greenland; Last millennium. |
| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00421/53291/54134.pdf |
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| Sarnthein, Michael; Küssner, Kevin; Grootes, Pieter M.; Ausin, Blanca; Eglinton, Timothy; Muglia, Juan; Muscheler, Raimund; Schlolaut, Gordon. |
| Changes in the geometry of ocean meridional overturning circulation (MOC) are crucial in controlling past changes of climate and the carbon inventory of the atmosphere. However, the accurate timing and global correlation of short-term glacial-to-deglacial changes of MOC in different ocean basins still present a major challenge. The fine structure of jumps and plateaus in atmospheric and planktic radiocarbon (14C) concentration reflects changes in atmospheric 14C production, ocean–atmosphere 14C exchange, and ocean mixing. Plateau boundaries in the atmospheric 14C record of Lake Suigetsu, now tied to Hulu Cave U∕Th model ages instead of optical varve counts, provide a stratigraphic “rung ladder” of up to 30 age tie points from 29 to 10 cal ka for accurate... |
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| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00665/77699/79779.pdf |
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