Dendrochronological indication of the evolution of «frost mounds – thermokarst lakes» paragenetic system
Abstract
The dynamics of frost mounds and thermokarst lakes as paragenetic geosystems is described basing on the dendrochronological analysis of larch and cedar cores collected in forest tundra (Novy Urengoy) and northern taiga (Nadym) landscapes of the Western Siberia Plain. During 1990-s – 2000-s there was a massive loss of trees along the shores of modern thermokarst lakes within forest-tundra and northern taiga landscapes. No destabilization periods were recorded in forest-tundra for the whole life cycle of larch since the mid-19th century. In the northern taiga soils were unstable during the entire period of tree growth. Around 2000 there was an activation of thermokarst processes in both landscapes due to warming and increased precipitation. The area of thermokarst lakes in the landscape structure has increased by several percent.
Keywords
geosystem,
landscape,
forest-tundra and northern taiga landscapes,
paragenetic complex,
permafrost,
frost mounds,
thermokarst lake,
dendrochronological indication
Supporting agencies: The authors would like to thank L.I. Zotova, Leading Scientific Researcher, for her constructive comments and advice.
About the Authors
K. N. Diakonov
Lomonosov Moscow State University
Russian Federation
Faculty of Geography, Department of Physical Geography and Landscape Science, Head of the Department, Professor, D.Sc. in Geography, Corresponding Member of the RAS
Russian Federation
Faculty of Geography, Department of Physical Geography and Landscape Science, Head of the Department, Professor, D.Sc. in Geography, Corresponding Member of the RAS
Yu. A. Bochkarev
Lomonosov Moscow State University
Russian Federation
Faculty of Geography, Department of Physical Geography and Landscape Science, Engineer, PhD. in Geography; Earth Cryosphere Institute, Tyumen Science Center SB RAS
Russian Federation
Faculty of Geography, Department of Physical Geography and Landscape Science, Engineer, PhD. in Geography; Earth Cryosphere Institute, Tyumen Science Center SB RAS
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Review
For citations:
Diakonov K.N., Bochkarev Yu.A. Dendrochronological indication of the evolution of «frost mounds – thermokarst lakes» paragenetic system. Lomonosov Geography Journal. 2019;(4):15-23. (In Russ.)
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