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serendipity
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What are the climatic conditions associated with the occurence of permafrost? (apart from temperatures below 4 degrees C)

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Bhaal85
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(Original post by serendipity)
What are the climatic conditions associated with the occurence of permafrost? (apart from temperatures below 4 degrees C)

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Any rock or soil material that has remained below 32° F continuously for two or more years. The two-year minimum stipulation is meant to exclude from the definition the overlying ground surface layer which freezes every winter and thaws every summer (called the "active layer" or "seasonal frost").
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Bhaal85
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(Original post by Bhaal85)
Any rock or soil material that has remained below 32° F continuously for two or more years. The two-year minimum stipulation is meant to exclude from the definition the overlying ground surface layer which freezes every winter and thaws every summer (called the "active layer" or "seasonal frost").
By type
Cold permafrost — Remains below 30° F, and which may be as low as 10° F as on the North Slope; tolerates introduction of considerable heat without thawing.

Ice-rich — 20% to 50% visible ice.

Thaw-stable — Permafrost in bedrock, in well drained, coarse-grained sediments such as glacial outwash gravel, and in many sand and gravel mixtures. Subsidence or settlement when thawed is minor, foundation remains essentially sound.

Thaw-unstable — Poorly drained, fine grained soils, especially silts and clays. Such soils generally contain large amounts of ice. The result of thawing can be loss of strength, excessive settlement and soil containing so much moisture that it flows.

Warm permafrost — Remains just below 32° F. The addition of very little additional heat may induce thawing
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PQ
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(Original post by serendipity)
What are the climatic conditions associated with the occurence of permafrost? (apart from temperatures below 4 degrees C)

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http://www.bbc.co.uk/dna/h2g2/alabaster/A892172

any help (scroll down to tundra)
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Bhaal85
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(Original post by serendipity)
What are the climatic conditions associated with the occurence of permafrost? (apart from temperatures below 4 degrees C)

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Or just click on this link

http://sts.gsc.nrcan.gc.ca/permafrost/whatis.html
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serendipity
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(Original post by Bhaal85)
Any rock or soil material that has remained below 32° F continuously for two or more years. The two-year minimum stipulation is meant to exclude from the definition the overlying ground surface layer which freezes every winter and thaws every summer (called the "active layer" or "seasonal frost").
lol i already found that definition in google! rep later, cheers bhaal
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Bhaal85
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(Original post by serendipity)
lol i already found that definition in google! rep later, cheers bhaal
I just wanted you to know, it wasn't for the rep.
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serendipity
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ooh i take that back, thanks pencil queen and bhaal, rep coming your way
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