Solar forcing as an important trigger for West Greenland sea-ice variability over the last millennium
|Author(s)||Sha Longbin1, 2, Jiang Hui1, 3, Seidenkrantz Marit-Solveig4, 5, Muscheler Raimund6, Zhang Xu7, Knudsen Mads Faurschou4, 5, Olsen Jesper8, Knudsen Karen Luise4, 5, Zhang Weiguo3|
|Affiliation(s)||1 : E China Normal Univ, Key Lab Geog Informat Sci, Shanghai 200062, Peoples R China.
2 : Qjngdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Peoples R China.
3 : E China Normal Univ, State Key Lab Estuarine & Coastal Res, Shanghai 200062, Peoples R China.
4 : Aarhus Univ, Ctr Climate Studies, DK-8000 Aarhus C, Denmark.
5 : Aarhus Univ, Arctic Res Ctr, Dept Geosci, DK-8000 Aarhus C, Denmark.
6 : Lund Univ, Dept Geol, Quaternary Sci, S-22362 Lund, Sweden.
7 : Alfred Wegener Inst Helmholtz Ctr Polar & Marine, D-28359 Bremerhaven, Germany.
8 : Aarhus Univ, Dept Phys & Astron, DK-8000 Aarhus C, Denmark.
|Source||Quaternary Science Reviews (0277-3791) (Pergamon-elsevier Science Ltd), 2016-01-01 , Vol. 131 , N. Part A , P. 148-156|
|WOS© Times Cited||20|
|Keyword(s)||Sea-ice variability, Solar activity, West Greenland, Last millennium|
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 affect local sea-ice formation, but also control the sea-ice transport from the Arctic Ocean through a sea-ice-ocean-atmosphere feedback mechanism. The role of solar forcing, however, appears to have been more ambiguous during an interval around AD 1500, after the transition from the Medieval Climate Anomaly to the Little Ice Age, likely to be driven by a range of factors.