Thermokarst lakes in the south of permafrost zone of Western Siberia: a study of morphometry, water budget and water exchange rates
|Lead Author||Valerii, Zemtsov|
|Institution Contact||Tomsk State University 36 Lenin Avenue, Tomsk, 634050, Russia|
|Co-Authors||Sergey Kopysov, Tomsk State University, Institute of Monitoring of Climatic and Ecological Systems, Siberian Branch of Russian Academy of Sciences, Russia, Victor Sinkinov, Tomsk State University, Russia|
|Theme||Theme 1: Vulnerability of Arctic Environments|
|Session Name||1.3 Siberian Inland Waters: Vulnerability to Global Change and Human Impact|
|Datetime||Thu, Sep 15, 2016 11:15 AM - 11:30 AM|
|Abstract text||Numerous thermokarst lakes in the northern regions of West Siberia play considerable role in organic matter production, release of CO2, CH4 to the atmosphere, and affect the ongoing processes of climate change, permafrost thawing and landscape transformations.
The morphometry, hydrological regime, water budget of Siberian thermokarst lakes as well as their bed composition and sediments remain insufficiently studied up to present. Only fragmentary data on the hydrology and dynamics of the thermokarst lakes have been collected by now.
Some field surveys of thermokarst lakes and their watersheds located in the permafrost zone at the experimental site near the settlement of Khanymey (63.8° N, 75.5° E) have been conducted. The work contained instrumental studies of lake bodies and catchment areas morphometry; lake bed composition and status (e.g. bed forming depositions, presence of permafrost, peat); snow cover depth, density and water equivalent in different landscapes, etc. Taking account of space imaginary and results of previous studies carried out by other researchers, the collected data allowed estimating the annual long-term means of water budget components of lakes and their watershed areas, parameters of water exchange rates such as coefficients of water exchange, residence time of water in the lakes and obtaining the relationships between the lake size and the water exchange coefficients. All these new results are needed for ongoing more detailed studies of water balance and runoff formation in Western Siberia.
The research has been supported by the grant issued in accordance with Resolution of the Government of the Russian Federation No. 220 dated 9 April 2010, under Agreement No. 14.B25.31.0001 with Ministry of Education and Science of the Russian Federation dated 24 June 2013 (BIO-GEO-CLIM), and by the grant No. 14-05-00700 of the Russian Foundation for Basic Research (RFBR).
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