freeze-thaw cycle
Quick Summary
The freeze-thaw cycle is a process where water repeatedly freezes and thaws. This occurs in meteorological contexts, particularly in cold regions. When water freezes, it expands by about 9 percent, exerting significant pressure on surrounding soil or rock. If this pressure exceeds the rock's tensile strength, it can cause fracturing. This phenomenon is known as a cryoseism, which can produce seismic vibrations and sounds mistaken for earthquakes.1
This cycle is a powerful agent of physical weathering. Repeated freezing and thawing can break down rocks, creating debris that accumulates as talus or forming extensive fields of rock fragments called felsenmeers. In permafrost regions, the active layer of soil undergoes seasonal freeze-thaw cycles, leading to features like patterned ground and solifluction lobes. The formation of ice on lakes and rivers also follows a seasonal freeze-thaw pattern, influenced by air temperatures.2345
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tundraSoils…are a result of the freeze-thaw cycle common to the tundra and are especially common in spring and fall. In alpine regions, surface features such as rock rings, stripes, and polygons are seen, usually measuring 15 to 30 cm (6 to 12 inches) across. Where there is adequate moisture for…
Read More…are a result of the freeze-thaw cycle common to the tundra and are especially common in spring and fall. In alpine regions, surface features such as rock rings, stripes, and polygons are seen, usually measuring 15 to 30 cm (6 to 12 inches) across. Where there is adequate moisture for…
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…the factors mentioned above, this freeze-thaw cycle sets the tundra apart from two ecosystems frequently found adjacent to it—the icy polar barrens on the one hand and the evergreen taiga on the other. Permafrost—perennially frozen ground—is a significant feature of the Arctic tundra; however, it does not typically occur in…
Read More…the factors mentioned above, this freeze-thaw cycle sets the tundra apart from two ecosystems frequently found adjacent to it—the icy polar barrens on the one hand and the evergreen taiga on the other. Permafrost—perennially frozen ground—is a significant feature of the Arctic tundra; however, it does not typically occur in…
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