TERMIUM Plus^®

Fiche 1,  Justifications,  Anglais

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However, as the evolution of the climate is not linear, there is no certainty that beyond a global warming of 2 °C climatic runaway will not occur, in response to phenomena still poorly appreciated such as increased CO₂ and methane emissions into the atmosphere caused by melting permafrost or the collapse of the Antarctic ice caps.  3, fiche 1, Anglais, - evolution%20of%20the%20climate

Fiche 1,  Justifications,  Français

Fiche 1,  Justifications,  Espagnol

Fiche 2,  Justifications,  Anglais

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The northern limit of tree growth; the sinuous boundary between tundra and boreal forest; taken by many to delineate the actual southern boundary of the Arctic Zone.  5, fiche 2, Anglais, - arctic%20tree%20line

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The northern treeline represents an abrupt change in surface characteristics and microclimate, from the high leaf area index, tall, deeply rooting boreal forest to the low leaf area index, shallow rooting and short stature of tundra grasses and shrubs.  6, fiche 2, Anglais, - arctic%20tree%20line

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The northern treeline is generally controlled by a temperature deficit, often modified by local conditions(such as permafrost occurrence). Recent studies however, identified a shift from temperature to moisture control in many places(such as Alaska), non-linear relationships between climate and tree growth, sub-population behaviour at northern treeline and the "divergence effect"(an underestimation of recent warming trends by tree ring based proxies).  7, fiche 2, Anglais, - arctic%20tree%20line

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arctic treeline: term used at Natural Resources Canada - Earth Sciences Sector.  8, fiche 2, Anglais, - arctic%20tree%20line

Fiche 2,  Justifications,  Français

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Limite [...] au-delà de laquelle aucun arbre ne pousse.  2, fiche 2, Français, - limite%20septentrionale%20des%20arbres

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Depuis 3 500 ans BP, la limite septentrionale des arbres est demeurée stable dans tout l'hémisphère nord.  3, fiche 2, Français, - limite%20septentrionale%20des%20arbres

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Plus de 80 % de la superficie du Canada située au sud de la limite septentrionale des arbres est boisée.  4, fiche 2, Français, - limite%20septentrionale%20des%20arbres

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limite septentrionale des arbres : Source : Rapport sur l'état de forêts 1998-1999.  5, fiche 2, Français, - limite%20septentrionale%20des%20arbres

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limite septentrionale des arbres : terme en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.  6, fiche 2, Français, - limite%20septentrionale%20des%20arbres

Fiche 2,  Justifications,  Espagnol

Fiche 3,  Justifications,  Anglais

Record number: 3, Textual support number: 1 CONT

Yedoma is an organic-rich (about 2% carbon by mass) Pleistocene-ageless permafrost with ice content of 50-90% by volume. The amount of carbon trapped in this type of permafrost is much more prevalent than originally thought and may be about 500 GT, that is almost 100 times the amount of carbon released into the air each year by the burning of fossil fuels. ... Yedoma currently occupies an area of more than one million square kilometers in northeast Siberia, and in many regions is tens of meters thick.  2, fiche 3, Anglais, - yedoma

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Alaska and Canada have a few hundred square miles of yedoma, but Siberia is where global warming is thawing the greatest quantities of this permafrost flash-frozen 40, 000 years ago.  3, fiche 3, Anglais, - yedoma

Fiche 3,  Justifications,  Français

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Ancienne matière organique à peine décomposée, emprisonnée dans le pergélisol.  2, fiche 3, Français, - yedoma

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Les complexes de glace (yedoma) pléistocènes de l'Alaska.  3, fiche 3, Français, - yedoma

Fiche 3,  Justifications,  Espagnol