Abstracts for the 5th International GAME Conf.
3-5 October 2001
Aichi Trade Center
Nagoya Japan
CHANGES IN MOISTURE AND TEMPERATURE OF THE ACTIVE LAYER AT SPASSKAYA PAD, GAME-SIBERIA STUDY AREA
P.P. Gavriliev (1), I.S. Ugarov (1), P.V. Yefremov (1), R.N. Argunov (1)
(1) Melnikov Permafrost Institute, Russian Academy of Sciences
The paper presents data on hydrothermal regime and hydrophysical properties of soils obtained from 7 sites in the Spasskaya Pad study area during the period 1996-2000. The dynamics of hydrothermal parameters of the active layer with regard to controlling environmental conditions and factors is characterized as follows:
1). Free (capillary) moisture is most dynamic. The inflow of soil moisture from the higher-lying areas caused an increase in the moisture content by 1.7 times in the thawed layer at site 1 (primary larch forest).
2). No significant warming occurs in the pergelic soils of forest landscapes. The penetration depth of the active 10C temperature was greatest (0.3 m) at site 3 below the pine forest and shallowest (0.1-0.2 m) at site 1 below the larch forest, being on average twice shallower than in the meadow-chernozem soil.
3). The thaw rate was highest in the meadow and pine forest (1.5-1.8 cm/day) and lowest on the inter-ridge depressions (0.9 cm/day). The greatest depth of thaw, 2.56-2.66 m, was recorded in the meadow, while the shallowest, 1.16 m, in the Betuleto-laricetum ledoso-alnosum and the Carex-calamagrostis tussock on the inter-ridge depressions.
4). A rich variety of the environmental conditions is responsible for the wide-range intra- and inter-seasonal variations in the hydrothermal parameters of the active layer.
5). Original data on the hydrophysical properties were obtained from the experimental sites in the Spasskaya Pad study area that allowed us to determine moisture content and moisture storage in the active layer.
6). Quantitative parameters of the hydrothermal regime and the hydrophysical properties of soils in the active layer provide a basis for assessing the regional and local water/energy cycles under present-day climate fluctuations.
The paper contains tables and graphs characterizing the hydrothermal parameters of the active layer. The problems of long-term monitoring of the active layer in the Lena basin are discussed.
Submittal Information
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Melnikov Permafrost Institute, Russian Academy of Sciences | |
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Yakutsk-10, Permafrost Institute | |
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