permafrostˈpɜr məˌfrɔst, -ˌfrɒst
permafrost (n)
permafrost
English Definitions:
permafrost (noun)
ground that is permanently frozen
permafrost (Noun)
Permanently frozen ground, or a specific layer thereof.
Permafrost
In geology, permafrost or cryotic soil is soil at or below the freezing point of water 0 °C for two or more years. Most permafrost is located in high latitudes, but alpine permafrost may exist at high altitudes in much lower latitudes. Ground 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. A global temperature rise of 1.5 °C above current levels would be enough to start the melting of permafrost in Siberia, according to one group of scientists.
Permafrost
Permafrost is ground that continuously remains below 0 °C (32 °F) for two or more years, located on land or under the ocean. Most common in the Northern Hemisphere, around 15% of the Northern Hemisphere or 11% of the global surface is underlain by permafrost, with the total area of around 18 million km2. This includes substantial areas of Alaska, Greenland, Canada and Siberia. It can also be located on mountaintops in the Southern Hemisphere and beneath ice-free areas in the Antarctic. Permafrost does not have to be the first layer that is on the ground. It can be from several centimeters to several hundred meters deep under the Earth's surface. It frequently occurs in ground ice, but it can also be present in non-porous bedrock. Permafrost is formed from ice holding various types of soil, sand, and rock in combination.Permafrost contains large amounts of biomass and decomposed biomass that has been stored as methane and carbon dioxide, making tundra soil a carbon sink. As global warming heats the ecosystem and causes soil thawing, the permafrost carbon cycle accelerates and releases much of these soil-contained greenhouse gases into the atmosphere, creating a feedback cycle that increases climate change. Thawing of permafrost is one of the effects of climate change. While emissions from thawing permafrost will be significant enough to lead to additional warming, they will likely not be enough to trigger a self-reinforcing feedback leading to "runaway warming".
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"permafrost." Kamus.net. STANDS4 LLC, 2024. Web. 26 Apr. 2024. <https://www.kamus.net/english/permafrost>.
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