arctic air mass

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• Air mass — For other uses, see Air mass (astronomy) and Air mass (solar energy). Different air masses which affect North America, as well as othe …   Wikipedia

• air mass — a body of air covering a relatively wide area, exhibiting approximately uniform properties through any horizontal section. [1890 95] * * * In meteorology, a large body of air having nearly uniform conditions of temperature and humidity at any… …   Universalium

• air mass classification — noun a) Meteorology. a system used to identify and to characterize the different air masses according to a basic scheme. A number of systems have been proposed, but the Bergeron classification has been the most widely accepted. In this system,… …   Wiktionary

• arctic air — noun : an air mass characterized by cold dry air from the arctic region compare polar air …   Useful english dictionary

• air mass — /ˈɛə mæs / (say air mas) noun a large body of air, up to thousands of kilometres in extent, of uniform temperature and humidity, and impacting on an adjacent air mass at a well defined front; classified according to temperature as Arctic,… …  

• arctic air —   an air mass originating over the Arctic Circle …   Geography glossary

• Arctic haze — is the phenomenon of a visible reddish brown haze in the atmosphere at high latitudes in the Arctic due to air pollution. A major distinguishing factor of Arctic haze is the ability of its chemical ingredients to persist in the atmosphere for an… …   Wikipedia

• arctic — arctically, adv. /ahrk tik/ or, esp. for 7, /ahr tik/, adj. 1. (often cap.) of, pertaining to, or located at or near the North Pole: the arctic region. 2. coming from the North Pole or the arctic region: an arctic wind. 3. characteristic of the… …   Universalium

• Arctic Regions — ▪ 2009 The Arctic regions may be defined in physical terms (astronomical [north of the Arctic Circle, latitude 66° 30′ N], climatic [above the 10 °C (50 °F) July isotherm], or vegetational [above the northern limit of the tree line]) or in human… …   Universalium

• arctic front — The surface of discontinuity between very cold air flowing directly from the arctic region and another less cold air mass. It is the boundary between the arctic and polar air masses mainly near the Arctic Circle. Advancing warm maritime air over… …   Aviation dictionary

• arctic front — noun : the boundary between an arctic and a polar air mass …   Useful english dictionary