Features of river runoff changes in different parts of Lena river basin caused by current climate warming.
A.Georgiadi (1)
(1) Institute of Geography Russian AAcademy of Sciences
River runoff seasonal and long-term changes in different parts of Lena river basin are characterized by significant differences. Main reasons of these differences are regional distinctions of climatic conditions, types and properties of permafrost, character of relief, hydrogeological conditions, features of surface and underground water interaction, types and properties of vegetation and soil covers and also regional features of cryogenic processes and phenomena.
River runoff within Lena river basin consists of the following components differing by their genesis: snowmelt runoff; rainfall runoff and the underground runoff formed by different types of underground waters (suprapermafrost, intrapermafrost and subpermafrost waters). "Cryogenic" redistribution of river runoff within the year plays important role in some parts of Lena river basin also. The contribution of genetic components to a total river runoff is differed in main hydrological seasons, role of different genetic components is changed from year to year and from region to region within Lena river basin.
Above mentioned reasons determine non-uniform reaction of river runoff changes (its annual sizes and its distribution on seasons and role of genetic components) on current global climate warming within Lena river basin.
Besides, regional manifestation of observed global climatic changes also are rather non-uniform within Lena river basin.
Results of analysis of tendencies of river runoff seasonal and long-term changes (in particular changes observed in last 10-20 years) and character of their connection with changes of climatic and permafrost conditions in geographical regions of Lena river basin differed by permafrost conditions as well as by other factors of river runoff formation are presented.
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A.Georgiadi
09-Aug-04-11:34:41
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Institute of Geography, Russian Academy of Sciences