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  2. Arctic oscillation - Wikipedia

    en.wikipedia.org/wiki/Arctic_oscillation

    The loading pattern of the Arctic Oscillation [3] The Arctic oscillation appears as a ringlike (or "annular") pattern of sea-level pressure anomalies centered at the poles. The presence of continents and large landmasses disrupts the ringlike structure at the Arctic pole, while anomalies surrounding the Antarctic pole are nearly circular.

  3. During the 2014 January polar vortex, more than 20 people across the country died from the cold as places like Georgia — which rarely see serious cold — dealt with lows under 10 degrees ...

  4. Arctic Circle - Wikipedia

    en.wikipedia.org/wiki/Arctic_Circle

    Relationship of Earth's axial tilt (ε) to the tropical and polar circles. The Arctic Circle is the southernmost latitude in the Northern Hemisphere at which the centre of the Sun can remain continuously above or below the horizon for twenty-four hours; as a result, at least once each year at any location within the Arctic Circle the centre of the Sun is visible at local midnight, and at least ...

  5. Sudden stratospheric warming - Wikipedia

    en.wikipedia.org/wiki/Sudden_stratospheric_warming

    Hence, further upward transfer of energy is completely blocked and a very rapid easterly acceleration and the polar warming occur at this critical level, which must then move downward until eventually the warming and zonal wind reversal affect the entire polar stratosphere.

  6. Dipole speaker - Wikipedia

    en.wikipedia.org/wiki/Dipole_speaker

    Another solution is to construct the dipole by means of a bipole with signal processing controlling the polar pattern. This enables switching between different polar patterns [ 6 ] or varying the polar pattern and efficiency versus frequency and versus output level.

  7. Polar climate - Wikipedia

    en.wikipedia.org/wiki/Polar_climate

    A snowy landscape of Inari located in Lapland A polar bear with cub. On Earth, the only continent where the ice cap polar climate is predominant is Antarctica. All but a few isolated coastal areas on the island of Greenland also have the ice cap climate. Summits of many high mountains also have ice cap climate due to their high elevation.

  8. Köppen climate classification - Wikipedia

    en.wikipedia.org/wiki/Köppen_climate_classification

    The Köppen climate classification divides Earth climates into five main climate groups, with each group being divided based on patterns of seasonal precipitation and temperature. The five main groups are A (tropical), B (arid), C (temperate), D (continental), and E (polar). Each group and subgroup is represented by a letter.

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