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WINTER POLE [3 records]

Record 1 2010-03-11

English

Subject field(s)
  • Weather Stations and Meteorological Instruments and Equipment
CONT

A radiosonde carried by a balloon rising at a few meters per second does not measure such inversions accurately because the response time of the thermistor is several seconds. To quantify this error, we flew a radiosonde on a tethered kite on several occasions in winter at South Pole Station immediately prior to the routine launch of the same sonde on a weather balloon. In all cases, the equilibrated temperatures measured by the tethered sonde at a given pressure level were higher than those from the balloon-borne sonde throughout most of the inversion layer. Assuming that the tethered sonde data represent the true atmospheric temperature profile, a procedure can be developed to correct the temperature data from routine radiosonde soundings for the finite response time of the thermistor.

French

Domaine(s)
  • Stations, instruments et équipements météorologiques
OBS

Sur le modèle de «ballon captif».

OBS

ballon captif : aérostat retenu par un câble.

Spanish

Save record 1

Record 2 2004-03-19

English

Subject field(s)
  • Atmospheric Physics
DEF

Westerly jet stream of maximum intensity near the stratopause, in the middle and subpolar latitudes of the winter hemisphere, caused by prolonged radiative cooling of the air in high latitudes during this season.

CONT

Polar-night jet stream. This jet meanders through the upper stratosphere over the poles. It occurs only during the long winter night. Remember, night is 6 months long over the pole in which winter is occurring. The polar stratosphere undergoes appreciable cooling due to the lack of solar radiation. The horizontal temperature gradient is strongly established between the equator and the pole, and the pressure gradient creates this westerly jet. The temperature gradient breaks down intermittently during middle and late winter in the Northern Hemisphere; therefore, the jet is intermittent at these times. In the Southern Hemisphere the temperature gradient and jet disappear rather abruptly near the time of the spring equinox.

Key term(s)
  • polar-night jet-stream
  • polar night jet-stream

French

Domaine(s)
  • Physique de l'atmosphère
DEF

Courant-jet d'ouest d'intensité maximale près de la stratopause, aux latitudes moyennes et subpolaires de l'hémisphère d'hiver, provoqué par le refroidissement radiatif prolongé de l'air aux hautes latitudes durant cette saison.

Spanish

Campo(s) temático(s)
  • Física de la atmósfera
DEF

Corriente en chorro, del oeste, que alcanza su máxima intensidad cerca de la estratopausa en las latitudes medias y subpolares del hemisferio invernal. Se origina como consecuencia del prolongado enfriamiento del aire por radiación en las latitudes altas durante esta estación.

Save record 2

Record 3 1993-06-24

English

Subject field(s)
  • Land Forces
DEF

In the context of winter operations, the order to remove the central pole in order to take down and pack up the tents in view of an immediate collective move.

French

Domaine(s)
  • Forces terrestres
DEF

Dans le contexte des opérations hivernales, ordre d'enlever le poteau central dans le but de démonter et plier les tentes en vue d'un départ collectif immédiat.

OBS

Définition et terme uniformisés par le Comité de terminologie française du Conseil de doctrine et de tactique de l'Armée de terre.

Spanish

Save record 3

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