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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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| Wanamaker, Alan D., Jr.; Butler, Paul G; Scourse, James D.; Heinemeier, Jan; Eiriksson, Jon; Knudsen, Karen Luise; Richardson, Christopher A.. |
| Despite numerous investigations, the dynamical origins of the Medieval Climate Anomaly and the Little Ice Age remain uncertain. A major unresolved issue relating to internal climate dynamics is the mode and tempo of Atlantic meridional overturning circulation variability, and the significance of decadal-to-centennial scale changes in Atlantic meridional overturning circulation strength in regulating the climate of the last millennium. Here we use the time-constrained high-resolution local radiocarbon reservoir age offset derived from an absolutely dated annually resolved shell chronology spanning the past 1,350 years, to reconstruct changes in surface ocean circulation and climate. The water mass tracer data presented here from the North Icelandic shelf,... |
| Tipo: Text |
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| Ano: 2012 |
URL: https://archimer.ifremer.fr/doc/00265/37651/36977.pdf |
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