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Topic: Dry adiabatic lapse rate

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	Adiabatic lapse rate - Wikipedia, the free encyclopedia
		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.
		In general, a lapse rate is the rate at which an atmospheric variable (usually temperature) decreases with altitude.
		The DALR is a constant 9.78 °C/km (3 °C/1000 ft, or 5.37 °F/1000 ft).
	en.wikipedia.org /wiki/Dry_adiabatic_lapse_rate (949 words)

	New Book - Glossary (Site not responding. Last check: 2007-08-17)
		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 (5.4°F per 1000 ft or 9.8°C per km) at which the temperature of a parcel of dry air decreases as the parcel is lifted, under the assumption that no heat is exchanged with its environment.
		Moist adiabatic lapse rate: the rate at which the temperature of a parcel of saturated air decreases as the parcel is lifted in the atmosphere.
	www.pnl.gov /atmos_sciences/Cdw/Glossary.html (11111 words)

	Adiabatic process Article, Adiabaticprocess Information (Site not responding. Last check: 2007-08-17)
		Adiabatic heating and cooling are processes that commonly occur due to a change in the pressure of a gas.
		The first rate is used to describe the temperature of the surrounding air that the rising air is passing through, and thesecond and third rates are in reference to a parcel of air that is rising through the atmosphere.
		The dry adiabatic lapse rateapplies to air which is below its dew point, ie which is not saturated by water vapor, whereas the wet adiabatic lapse rate applies to air which has reached itsdew point.
	www.anoca.org /adiabats/heat/adiabatic_process.html (790 words)

	Adiabatic Processes
		This rate of temperature change of unsaturated air with changing altitude is called the dry adiabatic lapse rate: the rate of change of the temperature of rising or subsiding air when no condensation is taking place (we'll talk about the condensation part shortly).
		The rate of temperature change as you rise in still air is not as great as the rate of change of rising air; that is, the air parcel does not cool off as fast.
		This is called the Saturated adiabatic lapse rate (or the wet adiabatic lapse rate, or the moist adiabatic lapse rate, depending on the textbook you are using).
	daphne.palomar.edu /jthorngren/adiabatic_processes.htm (1264 words)

	Determining Stability (Site not responding. Last check: 2007-08-17)
		The moist adiabatic lapse rate is not constant since it varies strongly with temperature.
		The average moist adiabatic lapse rate in the troposphere is 6 deg.
		The environmental lapse is the change in temperature with height measured by a weather balloon carrying a package of weather measuring instruments called a radiosonde.
	www.cimms.ou.edu /~cortinas/1014/l14_2.html (461 words)

	Gliding Magazine \| Features (Site not responding. Last check: 2007-08-17)
		This is known as the Dry Adiabatic Lapse Rate (DALR).
		Adiabatic means that the process takes place without exchanging heat with the environment outside.
		Lapse Rate is the term for the decrease of temperature with height.
	www.glidingmagazine.com /ListFeatureArticleDtl.asp?id=151 (1300 words)

	SUPERADIABATIC LAPSE RATE (Site not responding. Last check: 2007-08-17)
		A super-adiabatic lapse rate is usually caused by intense solar heating at the surface.
		A super-adiabatic lapse rate is common in the Southwest U.S. in the summer, but can occur in most regions of the U.S. in the summer when the skies are clear (maximum insolation), wind speeds are low (limited vertical mixing) and soils are dry (no evaporational cooling).
		Whether a super-adiabatic lapse rate at the surface leads to precipitation is a function of the moisture content of the air, the cap strength, trigger mechanisms, and upper level forcing mechanisms, etc. A super-adiabatic lapse rate in the middle and upper troposphere is rare.
	www.theweatherprediction.com /habyhints/31 (299 words)

	Instability
		The Dry Adiabatic Lapse Rate is the rate of temperature change experienced by an air parcel moving vertically relative to the surrounding air (whose temperature profile is shown by the Environmental Lapse Rate).
		The Wet Adiabatic Lapse Rate is the rate of temperature change experienced by a saturated air parcel in which condensation is occurring moving vertically relative to the surrounding air (whose temperature profile is shown by the Environmental Lapse Rate).
		This lapse rate is the dry adiabatic rate modified by the latent heat of condensation.
	tornado.sfsu.edu /geosciences/classes/m302/Instability.html (1668 words)

	Adiabatic Lapse Rate - Meteorology Self Instructions - [Meteorological Service of Canada - The Green Lane]
		These rates are known as ADIABATIC lapse rates and are independent of the atmospheric lapse rates which indicate the vertical distribution of temperature in the undisturbed air.
		The rate of cooling in rising unsaturated air (considered as "dry") or the rate of heating in sinking unsaturated air, is about 10°C per kilometre and is called the DRY ADIABATIC LAPSE RATE (DALR).
		/ km; the saturated adiabatic lapse rate is approximately....................
	www.msc-smc.ec.gc.ca /education/msi/m2/2d103_e.cfm (1069 words)

	Adiabatic lapse rate -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-08-17)
		Adiabatic lapse rate is used as an analytic device usually with reference to (Click link for more info and facts about Earth's atmosphere) Earth's atmosphere.
		Adiabatic lapse rate varies with the air's moisture content.
		Dry adiabatic lapse rate (DALR) occurs when the (Wetness in the atmosphere) humidity is low, and is a constant 2.98 °C/1000ft (9.78 °C/ (A metric unit of length equal to 1000 meters (or 0.621371 miles)) km).
	www.absoluteastronomy.com /encyclopedia/a/ad/adiabatic_lapse_rate.htm (177 words)

	Lapse rate - collegetextbooks.net (Site not responding. Last check: 2007-08-17)
		When used without qualification, the term "lapse rate" refers to the rate of decrease of atmospheric temperature with respect to altitude, -dT/dz and is often represented by the symbol G. This might also be called the atmospheric or environmental lapse rate.
		These are "process lapse rates", which describe the temperature change of a parcel of air undergoing some amount of vertical motion.
		The dry adiabatic lapse rate, for example, refers to the temperature change for a parcel of dry air which moves adiabatically.
	www.collegetextbook.net /sci_lapse.shtml (99 words)

	Subsidence Inversions - Conditional Stability (Site not responding. Last check: 2007-08-17)
		Any lapse rate in which the temperature decreases at a rate greater than 5.4°F per 1000 feet is absolutely unstable.
		Any lapse rate in which the temperature decreases at a rate less than 2.0°F per 1000 feet, or if the temperature increases with altitude, is absolutely stable.
		Any decrease of temperature with increase in altitude that falls between the moist and the dry adiabatic lapse rates indicates that the parcel of air is conditionally either stable or unstable depending on its moisture content.
	www.maybeck.com /inversions/fig1.html (132 words)

	DIFFERENT TERMS FOR A CHANGE IN TEMPERATURE WITH HEIGHT (Site not responding. Last check: 2007-08-17)
		Dry adiabatic lapse rate- The rate of temperature change of a dry parcel of air (near 10 C per kilometers in low levels of atmosphere)
		Moist adiabatic lapse rate- The rate of temperature change of a saturated parcel of air (varies with rate of latent heat release).
		Superadiabatic lapse rate- A temperature change with height that is greater than 10 C per kilometer.
	www.theweatherprediction.com /habyhints/143 (221 words)

	Explanation of Atmospheric Stability/Instability - by Steve W. Woodruff
		This heat energy is released thus lowering the rate at which the air parcel cools as it ascends.
		This rate is constant until the air parcel in ascent becomes saturated (reaches its dew point temperature).
		The saturated adiabatic lapse rate is variable since it largely depends on how much latent heat is made available within the air parcel as its moisture condenses.
	www.lapc.cc.ca.us /offices/weather/stability.html (2693 words)

	[No title] (Site not responding. Last check: 2007-08-17)
		On the upwind side it cools at the dry adiabatic lapse rate until it reaches its dew point.
		At the surface the air temperature is 10 degrees and it is dry.
		Notice that the dry adiabatic temperature lapse rate is greater than the moist adiabatic one, since the former gives a larger drop in temperature.
	www.vedur.is /~folk/halldor/HB/Met210old/AtmStab.html (802 words)

	adiabatic cooling and clouds (Site not responding. Last check: 2007-08-17)
		Adiabatic cooling deals with the cooling of parcels of air as they rise, or are forced up, through the atmosphere.
		The first is the ambient atmosphere lapse rate which is the rate that air cools as one goes up in altitude.
		The first rate is used to describe the temperature of the surrounding air that the rising air is passing through.
	ellerbruch.nmu.edu /cs255/mboutell/cloudadiabatic.html (219 words)

	The Weather Machine Clouds, Rain, Storms, etc.
		The stability of the atmosphere is determined by its temperature lapse rate.
		lWhen the lapse rate of an atmosphere is equal to the dry adiabatic lapse rate, the atmosphere is neutral.
		lWhen the lapse rate of an atmosphere is greater than the dry adiabatic lapse rate, the atmosphere is unstable.
	www.aos.wisc.edu /~aos121pkw/121-ch6-1_files/slide0007.htm (163 words)

	Dry adiabatic lapse rate
		is dry and the process is adiabatic, the rate of
		the ascent, the parcel heats at the dry adiabatic
		rate as it descends to the other side of the moun-tain.
	www.tpub.com /weather2/2-18.htm (329 words)

	NWS Louisville: Convective Parameters and Indices (Site not responding. Last check: 2007-08-17)
		A steep lapse rate is one in which the environmental temperature decreases rapidly with height.
		The K index is a measure of thunderstorm potential based on the vertical temperature lapse rate, and the amount and vertical extent of low-level moisture in the atmosphere.
		The SI is calculated by lifting a parcel dry adiabatically from 850 mb to its LCL, then moist adiabatically to 500 mb, and comparing the parcel versus environmental 500 mb temperatures similar to the LI.
	www.crh.noaa.gov /lmk/soo/docu/indices.htm (4500 words)

	stability
		By noting the environmental lapse rate and comparing the temperature of a rising parcel to the temperature of the environment at the same level, we can determine whether the atmosphere is absolutely stable, absolutely unstable, or conditionally unstable.
		Hence, the condition of conditional instability is whether the air parcel is cooling/heating at the moist adiabatic lapse rate, or the dry adiabatic lapse rate.
		The unsaturated air parcel cooled at the dry adiabatic lapse rate and the dewpoint decreased at the dewpoint lapse rate.
	www.meteor.wisc.edu /~aos100-2/stability (2147 words)

	Squalls!
		Whenever the lapse rate - what you measured with the balloon - is steeper than the adiabatic rate - wet or dry, as appropriate for the altitude and the amount of moisture - the air will be unstable.
		If heating near the ground causes the measured lapse rate to be steeper than the dry adiabatic lapse rate," added the other racer at the table, "even dry air will be unstable, and boil up in a column of rising air, or a thermal.
		The `downrush column' picks up speed, and as long as the lapse rate of the surrounding air is steeper than the wet adiabatic lapse rate, the downdraft air just keeps sinking faster as it falls through the cloud.
	www.well.com /user/pk/PCsqualls.html (3026 words)

	February 9, 1998 (Site not responding. Last check: 2007-08-17)
		So if the rate at which temperature is decreasing is greater than the rate at which pressure is decreasing as you move upward vertically in the atmosphere, density will be tending to increase as you move upwards.
		If the rate at which temperature is decreasing with elevation and the rate at which pressure is decreasing with elevation is such that density is not changing significantly with elevation, the atmosphere is considered neutral.
		If we are not considering dry air, the value of the adiabatic lapse rate is different because as moist air rises, there is c ondensation which is a heat releasing process.
	www.ucompass.com /met1010/lectures/020998 (883 words)

	EXTRAANS
		We use a dry adiabat because the surface air is not saturated (the air temperature is much warmer than the dewpoint temperature).
		The air parcel must initially lift dry adiabatically because the air temperature is significantly larger than the dew point temperature.
		If you were to draw the dry adiabat as well, you would find its temperature to be significantly colder than the actual air temperature.
	lasp.colorado.edu /~atoc1050/extraans.htm (970 words)

	ARM - About ARM
		The rate of decreased 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.
		The rate at which the temperature of a parcel of dry air decreases as the parcel is lifted in the atmosphere.
		The rate at which the temperature of a parcel of saturated air decreases as the parcel is lifted in the atmosphere.
	www.arm.gov /about/glossary.stm (7658 words)

	Lecture 13
		The environmental lapse rate is shown in the center of the diagram.
		To the left of the environmental lapse rate is shown the effect of lifting an air parcel according to the dry adiabatic lapse rate.
		To the right of the environmental lapse rate is shown the effect of lifting a moist parcel according to the moist adiabatic lapse rate.
	lasp.colorado.edu /~atoc1050/lectur14.htm (833 words)

	AtmoSphere - pages/lapseratesalevel.html (Site not responding. Last check: 2007-08-17)
		The rate at which the parcel cools, the DALR (dry adiabatic lapse rate), stays constant at 9.8 c per 1000m.
		The dry adiabatic lapse rate only applies when the relative humidity is less than 1000%.
		The SALR (saturated adiabatic lapse rate) range from 4 C per 1000m to as high as 9 C per 1000m.
	atschool.eduweb.co.uk /kingworc/departments/geography/nottingham/atmosphere/pages/lapseratesalevel.html (458 words)

	ATOC 4710/5710 Midterm 1
		We know that for a dry adiabatic process (first parcel), the potential temperature is constant, so parcel I at point A has a potential temperature of about 30 C (or about 303 K).
		Also depicted on the graph are the adiabatic temperature profiles for dry air and air with a relative humidity of 50%.
		Dry air at point B, if it continues to rise, will be colder, and therefore more dense, than the surroundings.
	paos.colorado.edu /~toohey/5710m1.html (1042 words)

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