Articles | Volume 15, issue 1
Clim. Past, 15, 25–40, 2019
https://doi.org/10.5194/cp-15-25-2019

Special issue: The 4.2 ka BP climatic event

Clim. Past, 15, 25–40, 2019
https://doi.org/10.5194/cp-15-25-2019

Research article 08 Jan 2019

Research article | 08 Jan 2019

The onset of neoglaciation in Iceland and the 4.2 ka event

Áslaug Geirsdóttir et al.

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Short summary
Compositing climate proxies in sediment from seven Iceland lakes documents abrupt summer cooling between 4.5 and 4.0 ka, statistically indistinguishable from 4.2 ka. Although the decline in summer insolation was an important factor, a combination of superposed changes in ocean circulation and explosive Icelandic volcanism were likely responsible for the abrupt perturbation recorded by our proxies. Lake and catchment proxies recovered to a colder equilibrium state following the perturbation.