Earth and Space Science - Quizlet Set #8
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19 terms
Terms | Definitions |
|---|---|
 expansional cooling | a temperature drop that accompanies a pressure reduction on an air parcel, as when air parcels rise within the atmosphere. |
| front | a boundary that exists between air masses with defferent temperatures and or water vapor concentrations |
| air mass | a large volume of air with uniform temperature and water vapor concentrations |
| cold front | a boundary in which a cold air mass is overtaking a cold air mass |
| warm front | a boundary in which a warm air mass overtaking a cold air mass |
| stationary front | a nearly motionless boundary between a cold air mass and a warm air mass. Wind blow parallel to the front, but in opposite direction on the two sides of the front. |
| occluded front | a boundary that forms when a cold front overtakes a warm front |
| dew point | the temperature above freezing to which air must be cooled to reach saturation |
| frost point | the temperature below freezing to which air must be cooled to reach saturation |
| saturation | a state in which the air is "holding" all of the water that it can at a given temperature |
| orographic lifting | a process by which air reaches saturation by being forced up over mountains |
| convectional cooling | when air reaches saturation because it has been heated and it rises because its density ha been reduced |
| cloud | a visible mass of water droplets or ice crystals that are suspended in an air layer that is not in contact with the ground |
| fog | a visible mass of water droplets or ice crystals that are suspended in an air layer that is in contact with the ground |
| radiation fog | a ground-level cloud formed by nightime radiational cooling of humid air layer. Common on clear nights with light winds over damp areas such as rain soaked fields or wetlands |
| advection fog | a ground-level cloud formed when a moist, warm, air mass mover over a cold surface like a snow pack, a lake, or an ocean |
| steam fog | a general name for a ground-level cloud that forms when cold air comes in contact with relatively warm water |
| dew | water droplets formed by condensation of water vapor on a relatively cold surfaces like grass, cars, etc |
| frost | ice crystals formed by sublimation of water vapor on a relatively cold surface like grass, cars, etc |
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