Late Miocene speleothems show significant warming, temperate vegetation, and wildfires in Arctic Siberia.

DOI
Publisher DOI
PubMed ID
40760001
Abstract
Climate driven northward boreal forest expansion into the tundra biome controlled by permafrost will play a major role in global emissions trajectories. Yet our limited understanding of the interplay between vegetation and permafrost makes predictions of changing boreal forest extent difficult. We analyse fossil pollen, stable carbon isotopes, and lignin and levoglucosan biomarkers from Tortonian speleothems (8.68 ± 0.09 Ma) from the Lena River Delta (N72.27°, E126.94°) in Arctic Siberia to infer palaeotemperature, precipitation, vegetation and fire regimes. The Tortonian provides a potential analogue for near future climate warming under extreme emissions scenarios, with global mean global temperature ca. 4.5°C above modern and atmospheric CO2 concentrations similar to present. We find evidence for a mixed forest regime, capable of maintaining wildfires, in a region currently dominated by tundra. Future transition to a similarly temperate regime would have large-scale impacts on the global carbon cycle.
Date Issued
2025-08-04
Publication Type
Article
Language(s)
en
Author(s)
Umbo, Stuart
Panitz, Sina
Homann, Julia
McCoy, Jessica
Pound, Matthew
Opel, Thomas
Vaks, Anton
Osintzev, Alexander
Adrian, Irina
Kononov, Aleksandr
Breitenbach, Sebastian F M
Additional Credits
Journal
Scientific Reports
Publisher
Nature Research
ISSN
2045-2322
Access(Rights)
open.access
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