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1 tornade
торнадо
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[ http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]EN
tornado
A rapidly rotating column of air developed around a very intense low-pressure centre. It is associated with a dark funnel-shaped cloud and with extremely violent winds (>300km/h) blowing in a counterclockwise spiral, but accompanied by violent downdraughts. The precise mechanisms are not fully understood but the following atmospheric conditions appear to be necessary for tornado development: a layer of warm moist air at low altitude; a layer of dry air at higher altitude with an inversion of temperature at about 1.000 m; a triggering mechanism, usually in the form of an active, intense cold front or solar heating of the ground which will create a vortex. (Source: WHIT)
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Франко-русский словарь нормативно-технической терминологии > tornade
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2 écosystčme de zone froide
экосистема холодной зоны
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[ http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]EN
cold zone ecosystem
The interacting system of a biological community and its non-living environmental surroundings located in climatic regions where the air temperature is below 10Đ° Celsius for eight to eleven months of the year. (Source: TOE / EOC)
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Франко-русский словарь нормативно-технической терминологии > écosystčme de zone froide
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3 inversion thermique
атмосферная инверсия
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[ http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]EN
atmospheric inversion
A temperature inversion in the atmosphere in which the temperature, instead of falling, increases with height above the ground. With the colder and heavier air below, there is no tendency to form upward currents and turbulence is suppressed. Inversions are often formed in the late afternoon when the radiation emitted from the ground exceeds that received from the sinking sun. Inversions are also caused by katabatic winds, that is cold winds flowing down the hillside into a valley, and by anticyclones. In inversion layers, both vertical and horizontal diffusion is inhibited and pollutants become trapped, sometimes for long periods. Low-level discharges of pollutants are more readily trapped by inversions than high level dischargers, hence the case for high stacks. Furthermore, high level discharges into an inversion tend to remain at a high level because of the absence of vertical mixing. (Source: GILP96)
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Франко-русский словарь нормативно-технической терминологии > inversion thermique
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