permafrost limit

См. также в других словарях:

• permafrost — /perr meuh frawst , frost /, n. (in arctic or subarctic regions) perennially frozen subsoil. Also called pergelisol. [1943; PERMA(NENT) + FROST] * * * Perennially frozen earth, with a temperature below 32 °F (0 °C) continuously for two years or… …   Universalium

• permafrost table — the variable surface constituting the upper limit of permafrost. Cf. frostline (def. 2). * * * …   Universalium

• permafrost table —    The upper limit of permafrost [16] …   Lexicon of Cave and Karst Terminology

• permafrost table — the variable surface constituting the upper limit of permafrost. Cf. frostline (def. 2) …   Useful english dictionary

• Swiss Alps — Satellite image of Switzerland in October 2002. On the north side of the Alps, the regions located above 2000 m are covered by snow. The canton of Ticino (on the south side) is almost snow free in early autumn. The Swiss Alps (German: Schweizer… …   Wikipedia

• Global warming — This article is about the change in climate Earth is currently experiencing. For general discussion of how Earth s climate can change, see Climate change …   Wikipedia

• boreal forest — ▪ northern forest Introduction also called  taiga        vegetation composed primarily of cone bearing, needle leaved, or scale leaved evergreen trees, found in regions that have long winters and moderate to high annual precipitation.       The… …   Universalium

• arctic — arctically, adv. /ahrk tik/ or, esp. for 7, /ahr tik/, adj. 1. (often cap.) of, pertaining to, or located at or near the North Pole: the arctic region. 2. coming from the North Pole or the arctic region: an arctic wind. 3. characteristic of the… …   Universalium

• Arctic Regions — ▪ 2009 The Arctic regions may be defined in physical terms (astronomical [north of the Arctic Circle, latitude 66° 30′ N], climatic [above the 10 °C (50 °F) July isotherm], or vegetational [above the northern limit of the tree line]) or in human… …   Universalium

• Tundra — In physical geography, tundra is an area where the tree growth is hindered by low temperatures and short growing seasons. The term tundra comes from Kildin Sami tūndâr uplands, tundra, treeless mountain tract . There are two types of tundra:… …   Wikipedia

• Current sea level rise — This article is about the current and future rise in sea level associated with global warming. For sea level changes in Earth s history, see Sea level#Changes through geologic time. Sea level measurements from 23 long tide gauge records in… …   Wikipedia