HR: 0800h
AN: C21C-1122    [Abstracts]
TI: Siberian Lena River Stream Temperature Regime and Change
AU: Liu, B
EM: ftbl@uaf.edu
AF: Water Environmental Research CTR, University of Alaska Fairbanks, 306 Tanana Lp, Fairbanks, AK 99775 United States
AU: * Yang, D
EM: ffdy@uaf.edu
AF: Water Environmental Research CTR, University of Alaska Fairbanks, 306 Tanana Lp, Fairbanks, AK 99775 United States
AB: Stream temperature is an important environmental variable that has considerable significance in regional hydrology, climate, and ecology systems. This research analyzed long-term (1950-1992) stream temperature data collected at key locations/stations in the Lena River basin during the open water/warm seasons. Preliminary results show that: (1) the stream temperature across the whole basin shows a significant positive trend during early warm season, which may indicate a response of early snowmelt due to climate warming in the winter and spring seasons; (2) over the Aldan tributary, stream temperatures collected at elevated locations are much lower than those at low valley stations; (3) in the Upper Lena river, stream temperatures have very strong negative trend in late July to early August, which imply certain climatic factors is affecting the stream temperature regime during this period; and, (4) in the Vilui subbasin, stream temperatures are strongly affected by reservoir regulations, for instance, extremely strong positive and negative trends appear at the station close to reservoir in early and middle warm season, respectively. The research has defined stream temperature regime and identified its long-term changes/variations over Lena river basin. Our onoging work examines the impacts of climate change on river thermal condition.
UR: http://www.uaf.edu/water
DE: 1719 Hydrology
DE: 1833 Hydroclimatology
DE: 1860 Streamflow
DE: 9315 Arctic region (0718, 4207)
SC: Cryosphere [C]
MN: Fall Meeting 2005