GEOG220 Chapter Notes - Chapter 9-13: Vertical Draft, Freezing Rain, Uch
22 May 2016
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Air masses: - an air mass is a huge body of air (1600 km or more across, several km thick) with homogenous physical properties (moisture, temperature being the main 2). Masses gain their characteristics due to their source region. The source regions are always flat land land or oceans (masses won"t come to over mountains, or where there is land and water at once. Will also only come to if the region doesn"t have circulation that would otherwise push the mass out. Air masses generally only form in polar or arctic regions and tropics, not in the middle latitudes. Winter air masses (na): cold (cp); frigid (ca); mild (mp); warm (mt, ct) Summer air masses (na): cool (cp); mild (mp); hot/dry (ct); hot/moist (mt) We consider 5 types of fronts: stationary front: cold front symbol + warm front symbols. Happens when cold air comes behind warm air but doesn"t push it upwards.
