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LD ES - Ch 8

LD Earth Science - Chapter 8 - Weather Systems

TermDefinition
Air Mass Large body of air that has a relatively uniform conditions of temperature and pressure
Anticyclone High pressure system that often brings cool, clear weather as it winds rotate clockwise and away from the center; a zone of divergence
Arctic Air Mass Extremely cold air mass that originated far north
Calorie A common measuring unit of heat energy
Cold Front Boundary between a mass of cold air and the warmer air that it is replacing
Continental Air Mass Body of dry air that is low in humidity because it formed over a land area
Convergence Coming together of winds as they blow into a cyclone (low pressure system)
Cyclone Low- pressure system in which the winds rotate counterclockwise in the Northern Hemisphere and converge to the center
Divergence Outward movement of winds from a high-pressure zone (anticyclone)
Electromagnetic Energy Energy, such as heat waves, visible light and x-rays, that can radiate through empty space.
Electromagnetic Spectrum Range of electromagnetic energy from long-wave radio waves to short wave gamma rays.
Evaporation Change in phase from a liquid to a gas (vapor); also known as vaporization
Front Boundary, or interface, between different air masses
Heat Total potential and kinetic energy that an object can release as heat
Heat of Fusion Latent potential energy absorbed when a solid melts and released when a liquid freezes.
Heat of vaporization Latent potential energy absorbed when a liquid vaporizes and released when a gas condenses.
High-pressure system Anticyclone; a dense mass of air in which the atmospheric pressure is highest at the center; a zone of divergence.
Kinetic Energy Energy of motion
Latent Heat Energy absorbed or released in a change of state. (Latent heat is so named because it does not show up as a temperature change)
Low-pressure System Weather system in which the atmospheric pressure is lower than the surrounding areas; cyclone.
Maritime Air Mass Body of air that is relatively moist because it formed over an ocean.
Occluded Front Type of weather front produced when a cold air mass overtakes a warm air mass, isolating the warm air above the ground.
Phase Physical state of matter, solid, liquid, or gas
Polar air mass Mass of cool air
Potential Energy Energy in storage, energy of position, or energy involved I a change of state
Stationary Front Interface, or boundary, between two air masses that are not moving
Station Model Standardized form in which weather information is presented at a preset position next to the circle that indicates the geographic location of the reporting station
Tropical Air Mass Warm air mass
Source Region Place where an air mass originates
Synoptic Weather Map Map showing a variety of field quantities, such as temperatures, pressure, and sky conditions, at a particular time and over a large geographic area.
Warm Front Boundary between a mass of warm air and the colder air it is replacing
Created by: desilva13