Britannica
Sources used in this answer
- tundra - Soils
- Alaskan mountains - Physiography of the northern ranges
- Arctic - Terrain of the Arctic
- Alaska - Drainage
- glacial landform - Permafrost , patterned ground, solifluction deposits, and pingos
- Teshekpuk Lake
- permafrost - Thermokarst formations
- Alaskan mountains - Climate of the Alaskan mountains
- Alaska - Climate of Alaska
Why does the North Slope contain many small lakes and ponds in summer?
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The North Slope of Alaska is underlain by permafrost, which is a layer of permanently frozen sediment and rock. During the brief summer, only a shallow surface zoneāknown as the active layerāthaws.12
Because the underlying permafrost is impermeable to water, it prevents downward drainage, causing the surface soil to become saturated and waterlogged. Additionally, the melting of ground ice within the permafrost creates depressions in the landscape, which quickly fill with water to form numerous small, ephemeral lakes and ponds. These features are often referred to as thermokarst formations.34125