Chapter 9 airmasses and fronts.docx

Chapter 9 airmasses and fronts.docx - Chapter 9 outline...

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Chapter 9 outline: airmasses and front I. Airmass: an airmass is a large body of air with relatively uniform thermal and moisture characteristics. Air masses cover large regions of the earth, typically several hundred thousand square kilometers and can be as deep as the depth of the troposphere ro as shallow as 1-2 km. airmasses form when air remains over a relatively flat region of the earth with homogeneous surface characteristics for an extended period of time. a. The atmosphere acquires the thermal and moisture properties of the underlying surface as heat is transferred between the surface as heat is transferred between the surface and the atmosphere and as moisture evaporates into the air from surface. b. Airmasses characterized by bitter cold temperatures are classified as artic airmasses, cold temperatures as polar airmasses and warm hot temperature as tropical airmasses. c. Airmasses that form over oceans are maritime d. Those that form over continents are continental. They are usually drier than maritime airmasses since relatively little surface water is evaporating into air over the continents. e. High pressure venter over the Atlantic is called Bermuda high because it is centered Bermuda, while its pacific counterpart is called pacific high f. The centers of very warm airmasses appear as semipermanent regions of low surface pressure. g. In winter semipermanent low pressure enters appear over the northern oceans. The semipermanent low over the pacific is called Aleutian low.
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