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Dry adiabatic lapse rate is approx. 9.8o C per kilometre being the temperature change of unsaturated air on rising or falling.



Related Terms

DALR

Dry adiabatic lapse rate is approx. 9.8o C per kilometre being the temperature change of unsaturated air on rising or falling.

NORTHER

A northerly wind. In the southern United States, especially in Texas (Texas norther) in the Gulf of Mexico, in the Gulf of Panama away from the coast, and in central America (the norte), the norther is a strong cold wind from the northeast to northwest. It occurs between November and April, freshening during the afternoon and decreasing at night. It is a cold air outbreak associated with the southward movement of a cold anticyclone. It is usually preceded by a warm and cloudy or rainy spell with southerly winds. The norther comes as a rushing blast and brings a sudden drop of temperature of as much as 25°F in 1 hour or 50°F in 3 hours in winter. The California norther is a strong, very dry, dusty, northerly wind which blows in late spring, summer and early fall in the valley of California or on the west coast when pressure is high over the mountains to the north. It lasts from 1 to 4 days. The dryness is due to adiabatic warming during descent. In summer it is very hot. The Portuguese norther is the beginning of the trade wind west of Portugal. The term is used for a strong north wind on the coast of Chile which blows occasionally in summer. In southeast Australia, a hot dry wind from the desert is called a norther.

DRY ADIABATIC LAPSE RATE

Approx. 9.8o C per kilometre being the temperature change of unsaturated air on rising or falling.

S.A.L.R.

Saturated Adiabatic Lapse Rate; the rate at which the temperature of water vapour saturated air changes as it ascends or descends. It is taken as 1.5 degree Celsius per 1000ft.

DUST DEVIL

A well-developed dust whirl, a small but vigorous whirlwind, usually of short duration, rendered visible by dust, sand, and debris picked up from the ground. Diameters of dust devils range from about 10 feet to greater than 100 feet; their average height is about 600 feet, but a few have been observed as high as several thousand feet. They have been observed to rotate anticyclonically as well as cyclonically. Dust devils are best developed on a hot, calm after- noon with clear skies, in a dry region when intense surface heating causes a very steep lapse rate of temperature in the lower few hundred feet of the atmosphere.

SALR

Saturated Adiabatic Lapse Rate; the rate at which the temperature of water vapour saturated air changes as it ascends or descends. It is taken as 1.5 degree Celsius per 1000ft.

MARINE CLIMATE

The type of climate characteristic of coastal areas, islands, and the oceans, the distinctive features of which are small annual and daily temperature range and high relative humidity in contrast with CONTINENTAL CLIMATE, which is characteristic of the interior of a large landmass, and the distinctive features of which are large annual and daily temperature range and dry air with few clouds.

SEA-AIR TEMPERATURE DIFFERENCE CORRECTION

A correction due to a difference in the temperature of the sea and air, particularly the sextant altitude correction caused by abnormal terrestrial refraction occur- ring when there is a nonstandard density lapse rate in the atmosphere due to a difference in the temperature of the water and air at the surface.

CONTINENTAL CLIMATE

The type of climate characteristic of the interior of a large land mass, the distinctive features of which are large annual and daily temperature range and dry air with few clouds, in contrast with MARINE CLIMATE.

CLIMATE

The prevalent or characteristic meteorological conditions of a place or region, in contrast with weather, the state of the atmosphere at any time. A marine climate is characteristic of coastal areas, islands, and the oceans, the distinctive features being small annual and daily temperature range and high relative humidity, in contrast with continental climate, which is characteristic of the interior of a large land mass, and the distinctive features of which are large annual and daily temperature range and dry air with few clouds.

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