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GEOG 2110L (50)
Lecture

AIR MASSES & FRONTS.docx

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Department
Geography
Course
GEOG 2110L
Professor
David Stanley
Semester
Spring

Description
AIR MASSES & FRONTS Air Mass: an immense body of air, some 1600+ km across and 1-3 km thick, with relatively homogeneous physical properties (density, T° & moisture) at a given altitude Classification Scheme: 2-letter abbreviations are used to indicate Source Region, characteristics, & Types of Air Masses * first letter: reference to surface over which it develops & thus the level of humidity (dry vs humid) c == continental: forms over a landmass = low water vapor content, dry m == maritime: forms over an ocean =high water vapor content, humid * second letter: reference to latitude or source region of origin & thus T° (cold vs warm) A== arctic; bitterly cold P== polar; very cold T == tropical; warm E == equatorial; very warm Source Regions: area in which air mass originates ** source region determines initial characteristics of the air mass; cold vs. warm (warm- unstable; cold- stable) dry vs. humid Types ofAir Masses: * ContinentalArctic (cA): Arctic basin & Greenland; bitterly cold & dry; Stable * Continental Polar (cP): Interior Canada &Alaska; cold & dry; Stable * Continental Tropical (cT): northern interior Mexico & sw U.S. (Summer only); hot & dry; usually Unstable * Maritime Polar (mP): north Pacific & northernAtlantic; cold & humid; usuall
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