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ATOC 184 Lecture15_Mar05_2012update

ATOC 184 Lecture15_Mar05_2012update - Sea-level...

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Sea-level pressures (solid contours) and fronts with a cyclone (L) moving across the central part of the continent .
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What is an airmass? In meteorology , an air mass is a large volume of air that has similar characteristics of temperature and water vapor content. Air masses form when air remains over relatively flat terrain with uniform surface characteristics for an extended period of time.
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Regions of Formation Regions where air masses can form include: Continental arctic regions such as Canada and Siberia Cool oceanic regions such as the North Atlantic and North Pacific Deserts such as the Sahara and the American southwest desert Tropical oceanic regions such as the Carribbean.
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Air mass classification Air masses are generally classified by their temperature as equatorial , tropical , polar or arctic And by their moisture content as either continental or maritime
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Combining these two categories, several possibilities are commonly found associated with North America: maritime polar
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ATOC 184 Lecture15_Mar05_2012update - Sea-level...

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