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Topic: Advection

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	Advection: transport of something from one region to another
		Assessing advection on weather maps is dependent upon two factors; 1) the strength of the wind and 2) the angle of the wind relative to the lines of equal value (isolines) of the variable being advected.
		The strongest advection occurs when the winds are oriented perpendicular (at 90 degrees) relative to the isolines.
		The end result of negative advection is to decrease the variable values in the direction the wind is blowing.
	ww2010.atmos.uiuc.edu /(Gh)/guides/mtr/af/adv/adv.rxml (235 words)

	Advection - Wikipedia, the free encyclopedia
		Advection is the transport of a conserved scalar quantity that is transported in a vector field.
		In meteorology and physical oceanography, advection usually refers to the predominantly horizontal transport of an atmospheric property or oceanic fluid by the wind, e.g.
		In this context, the advection operator (in z and p vertical coordinates) is
	en.wikipedia.org /wiki/Advection (137 words)

	Thermal advection
		Thermal (or heat) advection is the transport of sensible or latent heat by a moving fluid, such as air.
		Warm advection ahead of (to the east of) a frontal disturbance, and cold advection behind it, alter the thickness distribution and amplify the upper level short wave, thereby intensifying the frontal disturbance.
		Horizontal advection is usually frontogenetic, because the airmasses tend to converge towards the front.
	www-das.uwyo.edu /~geerts/cwx/notes/chap03/advection.html (550 words)

	Advection equation - Wikipedia, the free encyclopedia
		The advection equation is the partial differential equation that governs the motion of a conserved scalar as it is advected by a known velocity field.
		The advection equation is not simple to solve numerically: the system is a hyperbolic partial differential equation, and interest typically centers on discontinuous "shock" solutions (which are notoriously difficult for numerical schemes to handle).
		Even in one space dimension and constant velocity, the system remains difficult to simulate (it is a standard test for advection schemes known as the pigpen problem).
	en.wikipedia.org /wiki/Advection_equation (264 words)

	ADVECTION
		This keyword data block is used to specify the number of cells and the number of "shifts" for an advection simulation.
		Advection simulations are used to model one dimensional advective or "plug" flow with reactions.
		ADVECTION modeling to define simplistic dispersion or lateral inflow to the column.
	wwwbrr.cr.usgs.gov /projects/GWC_coupled/phreeqc/html/final-36.html (1481 words)

	"Dynamics" Means More Than "Vorticity Advection"
		In the case of the quasigeostrophic omega equation, "warm advection" is associated with synoptic-scale lift (not the same thing as warm frontal lifting) at the level where the advection is occurring.
		Since most of the temperature advection usually occurs in the lowest 10000 feet in West coast pattterns such as the one shown here, that is where most of the thermal advection forcing for upwards motion is found.
		The circled area is a qualitative approximation of the region of strongest warm advection at 850 mb.
	home.earthlink.net /~montever/warmadv/qg.html (1040 words)

	AMS Glossary
		The first two terms compose the horizontal advection and the last term is the vertical advection.
		Often, particularly in synoptic meteorology, advection refers only to the horizontal or isobaric components of motion, that is, the wind field as shown on a synoptic chart.
		Regarding the general distinction (in meteorology) between advection and convection, the former describes the predominantly horizontal, large-scale motions of the atmosphere, while convection describes the predominantly vertical, locally induced motions.
	amsglossary.allenpress.com /glossary/search?id=advection1 (206 words)

	Vorticity and vert motion
		Advection of vorticity and the thermal field tend to disrupt geostrophic and hydrostatic balance, and the solution of the QG omega equation describes a hypothetical vertical motion field that exactly and instantaneously restores geostrophic and hydrostatic balance.
		Divergence downstream and convergence upstream (relative to the column) counteracts the tendency for advection to tilt the tube...
		To the extent that it is a significant contributor to vertical motion, ignoring the contribution to vertical motion from thermal advection seems quite obviously to be a perilous assumption.
	www.cimms.ou.edu /~doswell/PVAdisc/PVA.html (3924 words)

	USATODAY.com (Site not responding. Last check: 2007-10-26)
		Such fog is called "advection" fog because meteorologists say the warm air has been "advected" into the region.
		The term "advection" refers to the horizontal transport of any meteorological property such as humidity or temperature.
		Advection fog is very common during winter warm ups and early spring thaws and can occur almost anywhere in the USA.
	www.usatoday.com /weather/tg/wadvfog/wadvfog1.htm (251 words)

	34.2.1 Balance between advection and diffusion
		The representation of advection in a numerical model is nontrivial.
		Advection of momentum is still done with centered difference scheme used by Bryan (1969).
		Therefore, with centered difference discretization of advection, it is necessary to also include a nonzero amount of viscosity or diffusivity.
	www.gfdl.noaa.gov /~smg/MOM/web/guide_parent/s7node207.html (442 words)

	Warm Advection Wins Again (Site not responding. Last check: 2007-10-26)
		Thus, the differential vorticity advection DIAGNOSES (does not cause it) the vertical motion field associated with the instantaneous geometry of the flow pattern.
		Since vorticity advection close to the ground is normally negligible, this term is approximated by the vorticity advection at the top of the layer in question, say, at 500 mb.
		Also, negative vorticity advection at, say, 500 mb, may be associated with forcing for upward motion by this term if the negative vorticity advection at lower elevations is a larger magnitude (as occurred for the 24 February 2001 case shown below).
	home.earthlink.net /~montever/warmadv/qg2.html (1205 words)

	Tracer Advection in HYCOM
		The evolution of temperature and salt is governed by an advection-dominated advection diffusion equation.
		For this reason the development of numerical advection schemes is still an active field even though its inception dates back to the early days of computing.
		Aside from the basic advection scheme all subroutines above have an FCT algorithm appended to enforce monotonicity.
	ostrogoth.rsmas.miami.edu /~mohamed/HYCOM/Advection (978 words)

	Advection
		Advection of temperature is the horizontal transport of temperature (or anything, really, but we will concentrate on temperature) by the wind.
		For example, if there is a mass of colder air to the north for the forecast region, and the wind in the forecast region is northerly, then we might expect to blow cold air into the forecast region.
		For this exercise significant advection will occur when at least a 1 degree F temperature change due to advection occurs in the two hour period preceding 18Z (i.e., the total change for two hours, 17Z and 18Z is 1 degree F or more).
	geology.wcupa.edu /weather/forecast/discuss4.html (166 words)

	Advection.NET: Streaming Media Hosting
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		The Advection Media Platform—we call it "AMP"—gives you tremendous scalability based on the best practices of sites like Flickr, YouTube, LiveJournal, or Amazon.com, backed by our 24/7 network operations center.
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	www.advection.net (1048 words)

	THE SIMPLIFIED OMEGA EQUATION (THERMAL ADVECTION TERM)
		One term in the omega equation is thermal advection.
		This essay will be interested in the operational meteorology interpretation of thermal advection and the contribution it gives to vertical motion.
		There is not a direct relationship between thermal advection and resultant vertical motion in the atmosphere since other lifting and sinking mechanisms can complicate the picture (i.e.
	www.theweatherprediction.com /habyhints/254 (763 words)

	Weather Glossary
		Advection - Transport of an atmospheric property by the wind.
		Cold Advection - Transport of cold air into a region by horizontal winds.
		Cold-air Funnel - A funnel cloud or (rarely) a small, relatively weak tornado that can develop from a small shower or thunderstorm when the air aloft is unusually cold (hence the name).
	www.geocities.com /Heartland/1102/wxdefs.html (5828 words)

	Advection Instructional Use Case (Site not responding. Last check: 2007-10-26)
		Since advection is a process, students need to view the phenomenon dynamically rather than through a static map.
		The purpose of this use case is to define a simulation which will allow students to investigate the process of advection prior to a discussion of the process.
		It might be helpful to have an "advection bean" which does the display and let us develop the GUI for the simulation.
	www.iastate.edu /~abc/java/metapps.html (348 words)

	[No title] (Site not responding. Last check: 2007-10-26)
		As a result the net advection velocity experienced by the particle is the average of the appropriate part of the parabolic velocity profile.
		The result of including the effects of diffusion on advection velocity is to decrease the velocity range experienced by particles as they travel the length of a fracture, thus reducing the chance for particle to have very low velocities near the fracture wall or the highest velocity at the fracture centre.
		The average advection velocity in the fracture is 0.76 m/day and longitudinal dispersion within the fracture is 0.76 m.
	www.weizmann.ac.il /ESER/Saltrans/SALTRANS_Deliverable9_Appendix4.doc (4518 words)

	advection fog - Hutchinson encyclopedia article about advection fog (Site not responding. Last check: 2007-10-26)
		Advection fog occurs when two currents of air, one cooler than the other meet, or by warm air flowing over a cold surface.
		Radiation fog forms through rapid heat loss from the land, causing condensation to take place and a mist to appear.
		This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional.
	encyclopedia.farlex.com /advection+fog (146 words)

	Non-Perturbative Zero Modes in the Kraichnan Model for Turbulent Advection
		of the Kraichnan model of turbulent passive scalar advection is believed to be dominated by the homogeneous solutions (zero-modes) of the Kraichnan equation
		The Kraichnan model of turbulent passive scalar advection [1] has attracted enormous attention recently, [2, 3, 4, 5, 6] being the first non-trivial model of turbulent statistics in which the phenomenon of multi-scaling seems understandable by analytic methods.
		This work was supported in part by the US-Israel BSF, the German-Israeli Foundation, the Minerva Center for Nonlinear Physics and the Naftali and Anna Backenroth-Bronicki Fund for Research in Chaos and Complexity.
	lvov.weizmann.ac.il /omri/omri.html (2118 words)

	Temperature Advection and Cloud movement - cold air advection (Site not responding. Last check: 2007-10-26)
		Temperature Advection and Cloud movement - cold air advection
		Cold-air advection and also be seen in satellite imagery....
		Describe with the aid of a diagram the movement of low and mid-level clouds for:
	apollo.lsc.vsc.edu /classes/met130/notes/chapter14/cold_advection_clouds3.html (41 words)

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