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ANNEAU ENVOL [1 record]

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Record 1 2025-01-09

English

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

Leading up to fall migration, a number of bird species are known to gather at large communal roosting sites, which are often detected by NWS [National Weather Service] Doppler radar. The unique doughnut pattern, known as a "roost ring," is the result of birds departing their roosting site in all directions, roughly in equal densities. As they travel further from their roosting site and reach higher altitudes, they are detected by radar until they either rise above or drop below the radar beam.

French

Domaine(s)
  • Stations, instruments et équipements météorologiques
  • Comportement animal
  • Oiseaux
DEF

Motif en forme d'anneau apparaissant sur les images de radars météorologiques causé par l'envol d'oiseaux à partir de leur site de repos dans toutes les directions de manière simultanée.

Spanish

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© Public Services and Procurement Canada, 2025
TERMIUM Plus®, the Government of Canada's terminology and linguistic data bank
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