HR: 1330h
AN: H22B-0919    [PDF]
TI: Long-Term Warm-Season Stream Temperature Variations and Changes Over Siberian Lena River
AU: * Liu, B
EM: ftbl@uaf.edu
AF: Water Environmental Research CTR of University of Alaska Fairbanks, P.O.Box 755860, Fairbanks, AK 99775 United States
AU: Yang, D
EM: ffdy@uaf.edu
AF: Water Environmental Research CTR of University of Alaska Fairbanks, P.O.Box 755860, Fairbanks, AK 99775 United States
AB: Stream temperature is an important environmental variable that has considerable significance in regional hydrology, climate, and ecology systems. Few investigations on long-term stream temperature variations in Arctic regions have been undertaken. This research examined and analyzed long-term (1950-1992) stream temperature data collected at dozens of stations in the Lena River basin during (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 future work will examine the impacts of climate change on river thermal condition. We will also study the effects of local environmental settings to stream temperatures and aquatic life.
DE: 1719 Hydrology
DE: 1833 Hydroclimatology
DE: 1860 Runoff and streamflow
DE: 9315 Arctic region
SC: Hydrology [H]
MN: 2003 Fall Meeting