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Meteorology  Additive data  Adiabatic lapse rate

The Adiabatic lapse rate is the rate of temperature change that occurs in an atmosphere as a function of elevation, assuming that air behaves adiabatically. This term is most commonly used to refer to Earth's atmosphere.

adiabatic - See adiabatic process.
advection - The process of transport of an atmospheric property solely by the mass motion (velocity field) of the atmosphere; also, the rate of change of the value of the advected property at a given point.

Adiabatic process 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.

ADIABATIC: Occurring without loss or gain of heat. i.e., "adiabatic expansion of a body of air."
ADVECTION: The horizontal transport of air or atmospheric properties. Commonly used with temperatures, i.e., "warm air advection".

Adiabatic - Referring to a process without the addition or removal of heat. A temperature change may come about as a result of a change in the state of a gas.

Adiabatic Process- The change of temperature of air without transferring heat. In an adiabatic process compression results in warming, and expansion results in cooling.

ADIABATIC - changes in temperature caused by the expansion (cooling) or compression (warming) of a body of air as it rises or descends in the atmosphere.
ADNLY- Additionally ...

adiabatic process—The process by which fixed relationships are maintained during changes in temperature, volume, and pressure in a body of air without heat being added or removed from the body.

ADIABATIC- A process that causes rising air to cool and sinking air to warm
ADNLY- Additionally
ADV- Advisory ...

Adiabatic lapse rate - how quickly the temperature of a moving parcel of air changes, even though no heat enters or leaves it.

Adiabatic process - Expansional cooling or compressional warming of air parcels in which there is no net heat exchange between the air parcels and the surrounding (ambient) air.

Adiabatic Processes: An adiabatic process is one in which no heat is exchanged with the surrounding air.
Rising air expands as the pressure of the surrounding air decreases (there is less air above it).

A thermodynamic change of state in a system in which there is no transfer of heat or mass across the boundaries of the system. In this process, compression will result in warming and expansion will result in cooling.

A thermodynamic process in which no heat is transferred to the surrounding air.
In an adiabatic process, compression of an air parcel results in an increase in temperature, while expansion results in a decrease in temperature.

Adiabatic cooling/heating The rate of cooling (by expansion) as an air parcel rises. It is approximately 1 degrees Celsius per 100 metres. It is also the rate of heating (by compression) as an air parcel descends.

Adiabatic Lapse Rate
The rate of decrease of temperature experienced by a parcel of air when it is lifted in the atmosphere under the restriction that it cannot exchange heat with its environment.

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 9.767C per kilometer upwards.

Dry Adiabatic Rate - The rate of adiabatic cooling or warming in unsaturated air. The rate of temperature change is 1C per 100 meters.

Dry Adiabatic Rate The rate of change of temperature in rising or descending unsaturated air parcel. The rate of adiabatic cooling or warming is 5.5F per 1,000 feet (10C per 1,000 meters).

An adiabatic process is one in which no heat is removed from, or added to, the parcel. Think of the plastic bag as being thoroughly insulated.

Dry Adiabatic Lapse Rate
NOAA National Weather Service - Cite This Source - This Definition ...

Dry Adiabatic Lapse RateThe 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 5.5F per 1000 ft or 9.8C per km.

moist adiabatic lapse rate (MALR)The rate at which the temperature of a parcel of saturated air decreases as the parcel is lifted in the atmosphere.

The subsiding air compresses as it descends, causing adiabatic warming.

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.

Moist AdiabatThe line on a Skew T-Log P chart that depicts the change in temperature of saturated air as it rises and undergoes cooling due to adiabatic expansion. As saturated air rises, the temperature changes at a rate of 0.

Compare to adiabatic process. Diamond-Hinnman radiosonde A variable audio-modulated radiosonde developed at the Bureau of Standards and used by the United States weather services.

Such ascent/descent is said to be adiabatic, which means that the energy/heat changes are confined to that particular parcel.
Provided the parcel is warmer (less dense) than the environmental air through which it is passing, it is buoyant, and rises.

Upslope Fog: It forms as air is cooled adiabatically by blowing up sloping terrain. The upslope cooling may form clouds concurrently with the fog.

As a parcel rises adiabatically, its pressure decreases and its temperature falls due to the expansion of the air parcel. When an air parcel is unsaturated and rises, then the temperature decreases at a rate of 1C per 100 meters (5.

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.

Foehn Winds: Winds descending downslope from mountains which are characteristically warm and dry due to adiabatic compression.

The lowest temperature that an air parcel would have if cooled adiabatically to saturation at constant pressure by evaporation of water into it, assuming that all latent heat required for evaporation would be supplied by the air parcel itself.

Theta-e (or Equivalent Potential Temperature) - The temperature a parcel of air would have if a) it was lifted until it became saturated, b) all water vapor was condensed out, and c) it was returned adiabatically (i.e.

Diabatic Heating - A process which occurs with the addition or loss of heat. The opposite of adiabatic. Meteorological examples include air parcels warming due to the absorption of radiation or release of latent heat.

11. Potential Temperature
The temperature a parcel of dry air would have if brought adiabatically (i.e., without transfer of heat or mass) to a standard pressure level of 1000 mb.

FOHN: A warm dry wind on the lee side of a mountain range. The heating and drying are due to adiabatic compression as the wind descend downslope.

Adibiatic Temperature Change- A cooling or heating of the air caused by expansion of contraction of air molecules, as opposed to the gain or loss of heat. For example, adiabatic cooling takes place as air rises.

It is then super-heated in an adiabatic compression process and becomes the "burning wind". A similar phenomenon also takes place in other countries; in the Alps it is called a Foehn, while in the Rocky Mountains, U.S. it is called a Chinook.

See also: See also: Air, Temperature, Water, Pressure, Surface

Meteorology  Additive data  Adiabatic lapse rate

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