dry adiabat"A line of constant potential temperature on a thermodynamic diagram. In terms of pressure p, and specific volume α, the equation for a dry adiabat may be written ...
dry adiabatic lapse rate: the rate at which an unsaturated parcel of air will decrease in temperature as it moves through the atmosphere. The rate is a decrease of about 9.767°C per kilometer upwards.
DRY ADIABAT The line on a Skew T-Log P chart that depicts the lifting of dry air, or air that is unsaturated. As a parcel rises adiabatically, its pressure decreases and its temperature falls due to the expansion of the air parcel.
Dry adiabatic rate The rate of change of temperature in a rising or descending unsaturated air parcel. The rate of adiabatic cooling or warming is 10ºC per 1000 m (5.5ºF per 1000 ft).
Dry Adiabatic Rate - The rate of adiabatic cooling or warming in unsaturated air. The rate of temperature change is 1°C per 100 meters.
Dry adiabatic lapse rate Rising unsaturated (clear) air parcels cool at the rate of about 10 Celsius degrees per 1000 m of uplift (or 5.5 Fahrenheit degrees per 1000 ft).
Dry Adiabatic Lapse Rate
The rate at which the temperature of a parcel of dry air decreases as the parcel is lifted in the atmosphere. The dry adiabatic lapse rate (abbreviated DALR) is 5.5?Ǭ?F per 1000 ft or 9.8?Ǭ?C per km.
Dry Crack ...
dry adiabatic lapse rate—The rate of decrease of temperature with height when unsaturated air is lifted adiabatically (due to expansion as it is lifted to lower pressure). See adiabatic process.
Dry Adiabatic Lapse Rate
NOAA National Weather Service - Cite This Source - This Definition ...
Dry adiabatic lapse rate - the rate of temperature change for dry (unsaturated) air moving vertically. The temperature will change by 5.4°F per 1000 feet or 9.8°C per kilometre.
Dry Adiabatic Lapse Rate
The rate at which the temperature of unsaturated air changes as it ascends or descends through the atmosphere. Approximates to some 10 degrees Celsius per kilometre.
Dust Devil ...
The dry adiabatic lapse rate (DALR) is the rate at which a rising parcel of unsaturated air, such as a thermal, will lose temperature. Unsaturated air has less than 100% relative humidity, ie it is below its dew point.
Related term: dry adiabat
MOISTURE
Refers to the water vapor content in the atmosphere, or the total water, liquid, solid or vapor, in a given volume of air.
Lifting Condensation Level - the level at which a parcel of moist air becomes saturated when it is lifted dry adiabatically.LDSLightning Detection SystemLDTLocal Daylight Time.
DALRDry Adiabatic Lapse RateDamIn hydrologic terms, any artificial barrier which impounds or diverts water. The dam is generally hydrologically significant if it is:
1.
Neutral StabilityAn atmospheric condition that exists in unsaturated air when the environmental lapse rate equals the dry adiabatic rate, or in saturated air when the environmental lapse rate equals the moist adiabatic rate.
absolutely unstable airAn atmospheric condition that exists when the environmental lapse rate is greater than the dry adiabatic lapse rate.
Contrast with a dry adiabat.Moist Adiabatic Lapse Rate(abbrev. MALR)- The rate at which the temperature of a parcel of saturated air decreases as the parcel is lifted in the atmosphere.
The dry adiabatic lapse rate is about 5.5 degrees F per 1000 feet, and the wet adiabatic lapse rate varies between 2 and 5 degrees F per 1000 feet.
As air rises up the western side of the Great Dividing Range it cools at the dry adiabatic lapse rate (DALR).
Dry Adiabatic Rate (DAR): if adiabatic cooling does not lower the temperature below the dew point for the moisture content of the rising parcel of air, then the rate of cooling with rise and expansion is 10 °C/1000 m.
Adiabatic Lapse Rate of Dry Air:The dry adiabatic lapse rate of dry air is 5 Degs. F or 3 Degs. C. per 1,000 ft.
Adiabatic Lapse Rate of Moist Air:The moist adiabatic lapse rate is 3.0 Degs. F or 1.5 Degs. C. per 1,000 ft.
The prevailing westerlies lose moisture in climbing the mountains, then warm up and dry out at the dry adiabatic rate on descent from the foothills at 9000 ft to the plains at 5000 ft.
An atmospheric condition that exists when the environmental lapse rate is greater than the dry adiabatic lapse rate.
Absorption
The process in which incident radiant energy is retained by a substance by conversion to some other form of energy.
ABSOLUTE INSTABILITY
When the lapse rate of a column of air is greater than the dry adiabatic lapse rate. The term absolute is used because this applies whether or not the air is dry or saturated.
Related term: instability ...
adiabat - In most contexts, same as dry adiabat. See also saturation adiabat, pseudoadiabat.
adiabatic - See adiabatic process.
The temperature that a parcel of dry air would have if it were brought dry adiabatically from its original position to a pressure of 1000 mb.
PRCP(6)
Abbreviation for precipitation.
Potential temperature - A measure of heat. It is the temperature air would be if brought dry adiabatically to 1000 mb.
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if the air is unsaturated (air temperature > dew point temperature), the cooling/warming will be at a rate of 3 degC per 1000 ft (or 10 degC per 1 km): This is known as the Dry Adiabatic Lapse Rate/DALR; ...
The adiabatic lapse rate (or dry adiabatic lapse rate) is the normal rate of change (9.8 degrees C/km) for a dry parcel of air that is moved up or down and cools or warms as the pressure changes. The wet (moist) adiabatic lapse rate (4.
Mixing Air movements (usually vertical) that make the properties of the air with a parcel homogeneous. It may result in a lapse rate approaching the moist or dry adiabatic rate.
 See also: Air, Temperature, Pressure, Adiabatic, Atmosphere
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