Uncovering Holocene climate fluctuations and ancient conifer populations: Insights from a high-resolution multi-proxy record from Northern Finland
Permanent lenke
https://hdl.handle.net/10037/34646Dato
2024-05-08Type
Journal articleTidsskriftartikkel
Peer reviewed
Forfatter
Salonen, J. Sakari; Kuosmanen, Niina; Alsos, Inger Greve; Heintzman, Peter D.; Rijal, Dilli Prasad; Schenk, Frederik; Bogren, Freja; Luoto, Miska; Philip, Annemarie; Piilo, Sanna; Trasune, Liva; Väliranta, Minna; Helmens, Karin F.Sammendrag
A series of abrupt climate events linked to circum-North Atlantic meltwater forcing have been recognised in
Holocene paleoclimate data. To address the paucity of proxy records able to characterise robustly the regional
impacts of these events, we retrieved a sub-centennial resolution, well-dated core sequence from Lake Kuutsjarvi, ¨
northeast Finland. By analysing a range of paleo-environmental proxies (pollen, plant sedimentary ancient DNA,
plant macrofossils, conifer stomata, and non-pollen palynomorphs), and supported with proxy-based paleotemperature and moisture reconstructions, we unravel a well-defined sequence of vegetation and climate dynamics over the early-to-middle Holocene. The birch-dominated pioneer vegetation stage was intersected by two
transient tree-cover decrease events at 10.4 and 10.1 thousand years ago (ka), likely representing a two-pronged
signal of the 10.3 ka climate event. Our data also show a clear signal of the 8.2 ka climate event, previously not
well recorded in the European Arctic, with a collapse of the pine-birch forest and replacement by juniper
developing in tight synchrony with Greenland isotopic proxies over 8.4–8.0 ka. Supported by climate modelling,
severe winter cooling rather than summer might have been driving vegetation disruptions in the early Holocene.
The Kuutsj¨
arvi data indicate an early arrival of Norway spruce (Picea abies) by 9.2 ka (pollen, DNA, and stoma
finds), as well as the first evidence for Holocene presence of larch (Larix) in Finland, with pollen finds dating to
9.6–5.9 ka.
Forlag
ElsevierSitering
Salonen, Kuosmanen, Alsos, Heintzman, Rijal, Schenk, Bogren, Luoto, Philip, Piilo, Trasune, Väliranta, Helmens. Uncovering Holocene climate fluctuations and ancient conifer populations: Insights from a high-resolution multi-proxy record from Northern Finland. Global and Planetary Change. 2024;237Metadata
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