circumpolar

Thân thiện

A bright circumpolar star remains visible all night above the northern horizon.

Definition

1. Adjective:
   • Located or found throughout a polar region: Describes something situated in, or occurring all around, the area of the North or South Pole.
   • (Of a celestial body) continually visible above the horizon: Describes a star or other object that, from a given observation point on Earth, never sets below the horizon due to its proximity to the celestial pole.

Usage Examples

• Adjective (Geographical):

  • Polar bears are a circumpolar species, inhabiting the Arctic region.
  • The tundra is a circumpolar biome surrounding the North Pole.

• Adjective (Astronomical):

  • From northern latitudes, Polaris is a circumpolar star.
  • Observers in Antarctica can see several circumpolar constellations.

Advanced Usage

• In scientific contexts: The term is precise, used in geography, astronomy, and ecology to describe phenomena or distributions relative to the poles.
  • The study focused on circumpolar currents in the Southern Ocean.
  • This lichen has a circumpolar distribution in the subarctic.

Variants and Related Words

• Circumpolarity (n): The state or condition of being circumpolar.
  • The circumpolarity of certain stars is key to celestial navigation.

Synonyms

• Polar: Relating to the North or South Pole.
• Peri polar: Situated around or near a pole (less common).

Different Meanings

The word has two distinct but related meanings: 1. Geographical/Ecological: Pertaining to the entire polar region (e.g., circumpolar nations, circumpolar wildlife). 2. Astronomical: Pertaining to a celestial object that remains above the horizon (e.g., circumpolar constellation).

Related Phrases/Idioms

• Circumpolar vortex: A large-scale circulation of winds around the polar regions.
  • A weakened circumpolar vortex can allow cold air to move southward.
• Circumpolar deep water: An ocean current that flows around Antarctica.
  • Circumpolar Deep Water plays a crucial role in global ocean circulation.

Học thuật

Adjective

1. located or found throughout a polar region
2. (of a celestial body) continually visible above the horizon during the entire 360 degrees of daily travel
   • a circumpolar star