Tavná voda na povrchu ledovců Svalbardu studovaná metodami DPZ

Sieglová, Eliška

Supraglacial lakes pond meltwater on the surface of glaciers. They form in the ablation zone during the ablation season and their darker surface lowers the albedo of the glacier. Once drained to the glacier bed, they may affect basal sliding and flow velocities of the glacier. High- resolution imagery from the Sentinel-2 mission was used to characterize the ablation season on two glacier regions of Svalbard: Hinlopenbreen glacier on the east coast and Kongsbreen and Kronebreen glaciers on the west coast of Spitsbergen. The first supraglacial lakes appeared in the first half of June in the west region and in the second half of June in the east region. The peak of the lake area was observed around the turn of June and July in the west region and around the half of July in the east region. The time of the first appearance of supraglacial lakes corresponded with temperatures reaching positive values. They first formed in lower elevations and started progressing higher with rising temperatures. Most supraglacial lakes formed between 600 and 700 m a.s.l. in the west region and between 400 and 500 m a.s.l. in the east region. In the east region a significant number of the supraglacial lakes (12 % of their total area) formed above the estimated equilibrium line altitude of 600 m a.s.l. Further research...

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