Landscape analysis of changes in the number of thermokarst lakes in west-siberian permafrost based on satellite images
Changes in the number of thermokarst lakes were investigated using multi-temporal satellite images. On the territory of West-Siberian permafrost, 33 test sites located in different landscape zones was selected. 134 cloudless multi-temporal images Landsat, obtained during the warmer months in the period 1973-2013 yrs, were used for remote research. Processing and interpretation of satellite images were performed using software tools of modern geographic information systems ENVI 4.7 and ArcGIS 9.3. Total number of thermokarst lakes in 33 test areas of Western Siberia was more than 50,000. It is shown that the number of disappeared lakes during the period of research in average decreases with increasing geographical latitude, and the number of appeared lakes in average significantly increases with increasing latitude. A comparison of the number of disappeared and formed lakes showed that the tendency to form new lakes dominated in tundra, and a tendency to reduce the number of lakes revealed in forest-tundra and the northern and middle taiga. Number of the newly appeared thermokarst lakes are significantly larger than number of disappeared lakes. So we can assume that the increase in methane emissions to the atmosphere with an increasing number of small thermokarst lakes in Western Siberia will contribute to the greenhouse effect.
Keywords
Thermokarst lakes,
space images,
permafrost,
landscape analysis,
Western SiberiaAuthors
| Bryksina N.A. | Immanuel Kant Baltic Federal University | NBryksina@kantiana.ru |
| Polishchuk Yu. | Institute of Petroleum Chemistry SB RAS | yupolishchuk@gmail.com |
Всего: 2
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