| Section C | C index | 621-629 of 1157 terms |
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cold-air pool—A topographic depression, such as a valley or basin, filled with cold air. The cold air is heavy, and settles to the bottom of the depression. This air can remain stagnant, trapped by the surrounding higher terrain, resulting in long periods of poor air quality and fog, depending on the sources of pollution and amount of moisture in the air, respectively.
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cold cap—As defined by A. Supan (1879), a region of the earth within which the mean temperature of the warmest month is less than 10°C. This limiting condition closely approximates the temperature at the arctic tree line, and was later adopted by W. Köppen (1918) as his boundary between the polar climates and tree climates. Supan also defined temperate belt and hot belt in his early form of climatic classification.
Supan, A., 1879: Die Temperaturzonen der Erde. Petermanns Geog. Mitt., 25, 349–358.
Köppen, W. P., 1918: Klassification der Klimate nach Temperatur, Niederschlag und Jahreslauf. Petermanns Geog. Mitt., 64, 193–203; 243–248.
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cold conveyor belt—An area in the atmosphere that transports cold air from one place to another. It often refers to the low-level airflow within the relatively cold air ahead of a developing cyclone.
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