Rapid thermokarst evolution during the mid-Holocene in Central Yakutia, Russia

Mathias Ulrich, Sebastian Wetterich, Natalia Rudaya, Larisa Frolova, Johannes Schmidt, Christine Siegert, Alexander N. Fedorov, Christoph Zielhofer

Результат исследования: Научные публикации в периодических изданияхстатья

18 Цитирования (Scopus)

Аннотация

The reconstruction of Holocene thermokarst landform evolution is important to understand the potential impact of current global climate change on permafrost regions. A multi-proxy approach was applied to analyse the sedimentological and biogeochemical characteristics as well as pollen and lacustrine microfossils of a core profile drilled in a small pingo within a large Central Yakutian thermokarst basin (alas). Age–depth modelling with macrofossil 14C ages reveals high thermokarst deposit sedimentation rates and a complete thermokarst sequence spanning about 900 years during the mid-Holocene between ~6750 and 5870 cal. yr BP. In total, three stages of thermokarst landscape evolution have been identified. Thermokarst processes were initiated at ⩽6750 to 6500 cal. yr BP. Terrestrial conditions changed quickly to lacustrine conditions, and a thermokarst lake rapidly emerged and grew to an estimated size of 120–600 m diameter and 7.5–15 m depth during only ~150 years between ~6500 and 6350 cal. yr BP. The decline of thermokarst processes and lake decrease may have been affected by local hydrological conditions between ~6350 and 5870 cal. yr BP but ceased completely after 5870 cal. yr BP, likely due to climatic changes. Clear evidence for long-lasting and stable lacustrine conditions was not obtained. The study emphasises that short-term warming led to very active permafrost degradation and rapid but locally variable modification of alas and thermokarst evolution.

Язык оригиналаанглийский
Страницы (с-по)1899-1913
Число страниц15
ЖурналHolocene
Том27
Номер выпуска12
DOI
СостояниеОпубликовано - 1 мая 2017

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  • Цитировать

    Ulrich, M., Wetterich, S., Rudaya, N., Frolova, L., Schmidt, J., Siegert, C., Fedorov, A. N., & Zielhofer, C. (2017). Rapid thermokarst evolution during the mid-Holocene in Central Yakutia, Russia. Holocene, 27(12), 1899-1913. https://doi.org/10.1177/0959683617708454