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Definitions (393)
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hygroscopic nuclei
Tiny particles of matter that have a special chemical affinity for water molecules, so that condensation may take place on these nuclei at relative humidities under 100 percent.
Meaning awaits approval from a moderator |
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valley breeze
A shallow, upslope flow of air that develops during daylight hours within mountain valleys.
Meaning awaits approval from a moderator |
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hair hygrometer
An instrument designed to monitor relative humidity by measuring the changes in the length of human hair that accompany humidity variations.
Meaning awaits approval from a moderator |
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atmosphere
A thin envelope of gasses (also containing suspended solid and liquid particles and clouds) that encircles the globe.
Meaning awaits approval from a moderator |
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convective condensation level
The altitude at which air parcels rising with the updraft of a convection cell reaches saturation; coincides with the base of cumuliform clouds.
Meaning awaits approval from a moderator |
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heterosphere
The atmosphere above 80 km (50 mi) where gases are stratified, with concentrations of the heavier gases decreasing more rapidly with altitude than concentrations of the lighter gases.
Meaning awaits approval from a moderator |
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intertropical convergence zone
(ITCZ) Discontinuous belt of thunderstorms paralleling the equator and marking the convergence of the Northern and Southern Hemisphere surface trade winds.
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ozone shield
Ozone (O3) within the stratosphere that filters out potentially lethal intensities of ultraviolet radiation (UV) from the sun.
Meaning awaits approval from a moderator |
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polar front
Transition zone between cold polar easterlies and mild midlatitude westerlies.
Meaning awaits approval from a moderator |
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station model
A conventional representation on a weather map using standard symbols of weather conditions at some locality.
Meaning awaits approval from a moderator |
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