Long-Term (2000-2017) Response of Lake-Bottom Temperatures and Talik Configuration to Changes in Climate at Two Adjacent Tundra Lakes, Western Arctic Coast, Canada
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Andersen, Trevor S.
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Carleton Univ, Dept Geog & Environm Studies, Ottawa, ON, CanadaCarleton Univ, Dept Geog & Environm Studies, Ottawa, ON, Canada
Andersen, Trevor S.
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Jardine, Patrick A.
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Carleton Univ, Dept Geog & Environm Studies, Ottawa, ON, CanadaCarleton Univ, Dept Geog & Environm Studies, Ottawa, ON, Canada
Jardine, Patrick A.
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Burn, Christopher R.
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Carleton Univ, Dept Geog & Environm Studies, Ottawa, ON, CanadaCarleton Univ, Dept Geog & Environm Studies, Ottawa, ON, Canada
Lakes, commonly underlain by taliks, are principal agents of disturbance to permafrost. We have measured lake-bottom temperatures with submerged loggers on near-shore terraces and in deep central pools at two tundra lakes on Richards Island, NT, to determine inter-annual lake thermal responses to climate variation. We have modelled associated potential adjustments in talik geometry. In 2000-17, annual mean temperatures varied between -5.7 and 2.1 degrees C for terraces and 1.1 and 4.5 degrees C for pools. Permafrost in the terraces is warmer than surrounding the lakes: talik configuration varies with horizontal terrace extent and terrace and pool temperatures. The talik break-through depth declines as terrace size increases. Using the four warmest and coldest years as an analogue for climate change-an adjustment that may occur this century-the increase in talik depth may be up to 100 m, but it may take millennia for talik geometry to reach equilibrium.