Physics
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3414501c&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 14, CiteID L14501
Physics
Cryosphere: Periglacial Processes, Global Change: Cryospheric Change (0776), Global Change: Impacts Of Global Change (1225), Hydrology: Climate Impacts, Hydrology: Erosion
Scientific paper
The hydrology of the Lena and its tributaries is characterized by an extremely episodic flow regime. Here we report recent climatic change in Central Siberia, and its impact on the fluvial thermal erosion. We point out three major changes since the 1980s: a marked reduction of the river ice thickness in winter, a pronounced increase of the water stream temperature in spring and a slight increase of the discharge during the break up (May-June). A GIS analysis based on aerial pictures and satellite images highlights the impact of the water warming on the frozen banks. The vegetated islands appear to be very sensitive to the water temperature increase, showing an acceleration of their head retreat (+21-29%). This suggests that recent global warming directly affects the fluvial dynamics and the erosional process of one of the largest arctic fluvial system.
Brunstein Daniel
Costard Francois
Dupeyrat L.
Fedorov Arkady
Gautier Eric
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