Lammers, R. B.. University of New Hampshire, Richard.Lammers@unh.edu
Vorosmarty, C. B.. University of New Hampshire,
Peterson, B. J.. Marine Biological Laboratory,
Shiklomanov, A. I.. Arctic and Antarctic Research Center,
Fekete, B. M.. University of New Hampshire,

 
HISTORICAL ANALYSIS OF DISCHARGE FROM PAN-ARCTIC RIVER SYSTEMS
 
The flux of freshwater from the Arctic watershed to the Arctic Ocean and hence to the North Atlantic is an essential link in the salt and freshwater balances of the Global Ocean. We have assembled a database of river discharge covering the entire pan-Arctic drainage system to assess the contemporary climatic mean water balance and to study regional trends in runoff over the past 40 years. The database represents over 3500 gauges in Eurasia and North America and covers a period from the late 1800's to 1990. Most gauges operated between 1960 to present. There is a decline in the number of gauges after 1985 as a result of gauge closings. Preliminary analyses suggest that trends from the rivers over all are not large and that different regions behave asynchronously. Large parts of southern Canada have experienced reduced runoff and some portions of Siberia show that winter runoff is increasing. Anthropogenic diversions of river waters appear to be a minor factor at present. We are currently using the assembled data to test a permafrost-based water balance model and a river routing model which will be used for predictions of freshwater fluxes in paleo-reconstructions and in future climate change scenarios.
 
Day: Tuesday, Feb. 2
Time: 09:30 - 09:45am
Location: Sweeney Center
 
Code: SS07TU0930S