EGU2020-1018, updated on 12 Jun 2020
https://doi.org/10.5194/egusphere-egu2020-1018
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Late Holocene fire history documented at Lake Khamra, SW Yakutia (Eastern Siberia)

Ramesh Glückler1, Ulrike Herzschuh1,2, Luidmila Pestryakova3, Stefan Kruse1, Stuart Vyse1, Andrei Andreev1, and Elisabeth Dietze1
Ramesh Glückler et al.
  • 1Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Polar Terrestrial Environmental Systems, Potsdam, Germany
  • 2Institute of Earth and Environmental Sciences, University of Potsdam, Potsdam, Germany
  • 3Institute of Natural Sciences, North-Eastern Federal University of Yakutsk, Yakutsk, Russia

Recent large-scale fire events in Siberia have drawn increased attention to boreal forest fire history. Boreal forests contain about 25% of all global biomass and act as an enormous carbon storage. Fire events are important ecological disturbances connected to the overarching environmental changes that face the Arctic and Subarctic, like vegetation dynamics, permafrost degradation, changes in soil nutrient cycling and global warming, and act as the dominant driver behind boreal forest’s landscape carbon balance. By looking into past fire regimes we can learn about fire frequency and potential linkages to other environmental factors, e.g. fuel types, reconstructed temperature/humidity or geomorphologic landscape dynamics. Unfortunately, fire history data is still very sparse in large parts of Siberia, a region strongly influenced by climate change. The Global Charcoal Database (www.paleofire.org) lists only a handful of continuous charcoal records for all of Siberia, with only three of those featuring published data from macroscopic charcoal as opposed to microscopic charcoal from pollen slides.

We aim to reconstruct the late Holocene fire history using lacustrine sediments of Lake Khamra (SW Yakutia at N 59.99°, E 112.98°). It covers an area of c. 4.6 km² with about 22 m maximum water depth, located within the zone of transition from summer-green and larch-dominated to evergreen boreal forest. We present the first continuous, high-resolution (c. 10 years/sample) macroscopic charcoal record (> 150 μm) including information on particle size and morphology for the past c. 2200 years. We compare this to complementary information from microscopic charcoal in pollen slides, a pollen and non-pollen palynomorph record as well as μXRF data. This multi-proxy approach adds valuable data about fire activity in the region and allows a comparison of different prevalent fire reconstruction methods. As the first record of its kind from Siberia, it provides a long-term context for current fire activity in central Siberian boreal forests and enables a better understanding of the environmental interactions occurring in the changing subarctic landscape.

How to cite: Glückler, R., Herzschuh, U., Pestryakova, L., Kruse, S., Vyse, S., Andreev, A., and Dietze, E.: Late Holocene fire history documented at Lake Khamra, SW Yakutia (Eastern Siberia) , EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-1018, https://doi.org/10.5194/egusphere-egu2020-1018, 2019

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