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20 Cards in this Set
- Front
- Back
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Absolute humidity
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The mass of water vapor in a given volume of air. It represents the density of water vapor in the air.
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Adiabatic process
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A process that takes place without a transfer of heat between the system (such as an air parcel) and its surroundings. In an adiabatic process compression always results in warming, and expansion results in cooling.
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Advection fog
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Occurs when warm, moist air moves over a cold surface and the air cools to below its dew point.
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Air mass
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Air mass A large expanse of air having similar temperature and humidity at any given height.
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Ambient air
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The air surrounding a cloud, or the air surrounding rising or sinking air parcels.
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Climate
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The accumulation of daily and seasonal weather events over a long period of time
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Coalescence
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The merging of cloud droplets into a single larger droplet.
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Continental air mass
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An air mass that forms over land; it is normally relatively dry.
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Convection
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atmospheric motions that are predominantly vertical, such as rising air currents due to surface heating.
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Dry adiabatic rate
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The rate of change of temperature in a rising or descending unsaturated air parcel.
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Intertropical convergence zone (ITCZ)
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The boundary zone separating the northeast trade winds of the Northern Hemisphere from the southeast trade winds of the Southern Hemisphere.
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Katabatic wind
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Any wind blowing downslope. Usually cold.
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Latent heat
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The heat that is either released or absorbed by a unit mass of a substance when it undergoes a change of state, such as during evaporation, condensation, or sublimation.
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Sensible heat transfer
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Movement of heat from one place to another as a consequence of conduction or convection or both.
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Temperature inversion .
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An extremely stable air layer in which temperature increases with altitude, the inverse of the usual temperature profile in the troposphere
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Thermal
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A small, rising parcel of warm air produced when the earth's surface is heated unevenly.
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Trade winds
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The winds that occupy most of the tropics and blow from the subtropical highs to the equatorial low.
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Warm front
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The leading edge of a warm air mass.
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Condensation
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A process requiring latent heat whereby water vapour in the atmpshere changes into a liquid state. It occurs when there is a change in temperature cauusing dew-point to be reached and eventually saturated.
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Evaporation
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A process whereby water particles in a liquid state turn into water vapour into the atmosphere; normally due to rising temperature levels, low rates of humidity, high wind speed and large exposed surface area
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