Permafrost
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 While these two men dig in Alaska to study soil, the hard permafrost requires the use of a jackhammer |
In geology, permafrost or cryotic soil is soil at or below the freezing point of water for two or more years. Most permafrost is located in high latitudes (i.e. land close to the North and South poles), but alpine permafrost may exist at high altitudes in much lower latitudes. Ice is not always present, as may be in the case of nonporous bedrock, but it frequently occurs and it may be in amounts exceeding the potential hydraulic saturation of the ground material. Permafrost accounts for 0.022% of total water and exists in 24% of exposed land in the Northern Hemisphere.
- Related: Arctic methane release, Drunken trees, Palsa, Pingo, Yedoma, Permafrost carbon cycle, Qingzang Railway
| International Permafrost Association (IPA) International Permafrost Association (IPA) www.ipa-permafrost.org - Web |
| What is Permafrost? What is Permafrost? cgc.rncan.gc.ca/permafrost/whatis_e.php - Web |
| Melting Russian Permafrost Could Accelerate Global... Melting Russian Permafrost Could Accelerate Global Warming www.keepmedia.com/.../1800717?ba=a&bi=17&bp=13 - Web |
Gallery for «Permafrost»
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| PERMAFROST: A Building Problem For Alaska PERMAFROST: A Building Problem For Alaska www.uaf.edu/coop-ext/publications/freepubs/HCM-00754.pdf - Web |
| Permafrost Young Researchers Network (PYRN) Permafrost Young Researchers Network (PYRN) www.pyrn.org - Web |
| United States Permafrost Association (USPA) United States Permafrost Association (USPA) www.uspermafrost.org - Web |
| Conversion Calculator Conversion Calculator www.eustis.army.mil/weather/weather_products/wxconversions.htm - Web |
| Geophysical Institute Permafrost Lab Geophysical Institute Permafrost Lab permafrost.gi.alaska.edu - Web |
