depth of zero annual amplitude
Link: http://w3id.org/permafrost/v/ipaglossary/t0075
Within: IPA Permafrost Glossary
Definition: The distance from the ground surface downward to the level beneath which there is practically no annual fluctuation in ground temperature (see Figure 2).
| Term |
depth of zero annual amplitude
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profondeur de l'amplitude annuelle nulle fr |
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| Comment |
A change of no more than 0.1?C throughout the year is arbitrarily considered as "practically no annual fluctuation". The temperature at the depth (or level) of zero annual amplitude ranges from about -0.1?C at the southern limit of the permafrost region to about -15?C in the extreme polar reaches of the zone of continuous permafrost. The depth of zero annual amplitude varies widely but generally lies between 10 and 20 m below the ground surface, depending on climatic and terrain conditions such as amplitude of annual surface temperature variation, vegetation, snowcover and characteristics of the soils and rocks including thermal diffusivity (see thermal properties of frozen ground).
en
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| dcterms:source |
https://doi.org/10.4224/20386561
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| skos:hiddenLabel |
zone of minimum annual amplitude
en
zone of zero annual amplitude en |