SS3.09 Climate-Lake Interactions
Date: Wednesday, June 12, 2002
Time: 2:30:00 PM
Location: Colwood
AndersonNJ, St Croix Watershed Research Station, Marine on St Croix, USA,
Brodersen, K, P, Freshwater Biological Laboratory, University of Copenhagen, Hilleroed, Denmark,
Temporal scaling of lake response to meteorological forcing along a climate gradient in the low Arctic of West Greenland
Lakes respond to climate forcing at a variety of timescales. Long-term (i.e. Holocene) changes in lake response to climatic variability can be modeled by understanding contemporary response, such as high-frequency breakdowns in thermal stratification driven by cooling and increased wind speed. However, direct meteorological forcing is tempered by lake size and morphometric setting. West Greenland contains thousands of lakes along a climatic gradient of low effective precipitation and continentality at the ice sheet margin to the more maritime (cooler and wetter) conditions at the coast (~150 km). We used temperature thermistors in 40 lakes and two automated weather stations to monitor changing thermal response (including date of ice melt) to climatic variability since 1998. The response of individual lakes to a meteorological event is related to their size, catchment characteristics and chemistry. The range in date of ice melt reflects interannual differences in air temperature and lake location. There is, however, considerable synchroneity in the timing of lake stratification response to changing weather patterns. The implications of these results for interpreting high-resolution stratigraphic records are discussed.