
	Where results make sense

Topic: Kelvin wave

Related Topics

Eliwood

In the News (Mon 4 Jun 12)

EXECUTIVE POWER

Iran

ANALYSIS

Pakistan

Family compact

	Modern History Sourcebook: Sir WilliamThomson (Lord Kelvin): Wave Theory Of Light, 1884
		The wave - length of light is the distance from crest to crest of the wave, or from hollow to hollow.
		The variation in wave length between the most extreme rays is in the proportion of four and a half of red to eight of the violet, instead of four and eight; the red waves are nearly as one to two of the violet.
		The length of this wave then is the 532d part of the four hundredth of a centimetre which would be the 21,280th of a centimetre, say the 21,000th of a centimetre.
	www.fordham.edu /halsall/mod/1884kelvin-light.html (8132 words)

	The delayed oscillator: Kelvin and Rossby waves (Site not responding. Last check: 2007-10-10)
		Kelvin and Rossby waves have different propagation speeds (and directions) because of their different latitudinal structure, once again owing to the important effect of the Coriolis force, which is strongly latitude-dependent.
		The Kelvin wave and Rossby wave signals generated by this wind stress are shown in the upper left panel of Figure 4.
		The Kelvin wave surface height anomaly is qualitatively similar to the imposed surface stress anomaly, with maximum amplitude on the equator and reduced amplitude off the equator, although the ocean wave structure decays much more rapidly with latitude.
	iri.columbia.edu /climate/ENSO/theory/waves.html (264 words)

	Kelvin wave - Wikipedia, the free encyclopedia
		A Kelvin wave is a wave in the ocean or atmosphere that balances the Earth's Coriolis force against a topographic boundary such as a coastline.
		A feature of a Kelvin wave is that it is non-dispersive, i.e., the phase speed of the wave crests is equal to the group speed of the wave energy for all frequencies.
		Atmospheric Kelvin waves propagate eastward in the Northern Hemisphere.
	en.wikipedia.org /wiki/Kelvin_wave (175 words)

	Lord Kelvin \| Wave Theory Of Light (Site not responding. Last check: 2007-10-10)
		The wave-length of light is the distance from crest to crest of the wave, or from hollow to hollow.
		The variation in wave length between the most extreme rays is in the proportion of four and a half of red to eight of the violet, instead of four and eight; the red waves are nearly as one to two of the violet.
		The length of this wave then is the 532d part of the four hundredth of a centimetre which would be the 21,280th of a centimetre, say the 21,000th of a centimetre.
	zapatopi.net /kelvin/papers/wave_theory_of_light.html (7688 words)

	Annual variability in the Indian Ocean - Part3
		Waves transmit the effects of changes in the overlying wind field, or perturbations due to coastal boundaries, from one region of the ocean to another, much faster than would be possible simply through transportation of water in wind-driven currents (3 to 10 times quicker for Kelvin waves).
		The zonal wavelength of this oscillation is estimated to be approximately 1000 -1300 km, with meridional velocities of 0.15 m.s-1 to 0.3 m.s-1.
		Yanai waves with a period of 26 days were observed in their model simulations : the model shows that these waves were formed within 1400 km of the western boundary, with the initial group of wave packets generated during late July-August.
	indianocean.free.fr /annual3.htm (2684 words)

	DIALOG Dissertation Abstracts (Site not responding. Last check: 2007-10-10)
		The Kelvin wave was found to dominate the velocity field at the boundaries, with velocities in the interior dominated by the higher vertical mode Poincaré waves.
		The Kelvin wave is shown to exist in resonant and non-forced states with the wind, and the resonance is shown to control the seasonal evolution of the Kelvin wave.
		The appearance of this high frequency internal wave energy was closely related to the strength of the wind field, and only weakly related to the phase of the basin-scale internal waves, implying a generation mechanism associated with shear instabilities in the surface mixed layer.
	aslo.org /phd/dialog/200102-11.html (475 words)

	Nature's Vicious Cycle - El Nino La Nina
		Although they are called waves, they are waves in the language of physics rather than waves that break on the seashore.
		Kelvin waves are created by winds blowing over the ocean surface from the west along the equator.
		Another wave you rarely hear about is called a Kelvin wave, and it has some characteristics in common with Rossby waves, but is somewhat faster and can only exist close to the equator (say, within about 5 degrees of latitude around the equator).
	library.thinkquest.org /26367/kar.htm (704 words)

	Publications about 'Kelvin waves'
		Turbulence at the tropopause due to breaking Kelvin waves observed by the equatorial atmosphere radar.
		Statosphere-troposphere exchange of ozone associated with the equatorial Kelvin wave as observed with ozonesondes and rawinsondes.
		Kelvin wave fronts, Rossby solitary waves and the nonlinear spin-up of the equatorial oceans.
	gershwin.ens.fr /lesommer/bibliographie/Keyword/KELVIN-WAVES.html (507 words)

	wave
		To have a quantitative understanding of the behavior of the waves during El Niño event, we are going to consider a shallow water model, assuming that the thermocline is the interface between the two immiscible layers of fluid (warm surface waters and cold waters in the deep ocean).
		Only the long wave that are nondispersive are important for the oceanic adjustment because the short waves are not significant enough to change the wind conditions.
		A Kelvin wave packet is non dispersive so that the its components are always in phase with each other and can interact nonlinearly in an efficient manner.
	orca.rsmas.miami.edu /~melicie/wave1.htm (405 words)

	Kelvin Waves (Site not responding. Last check: 2007-10-10)
		There are two types of Kelvin waves, coastal and equatorial, and they are both gravity driven and non-dispersive.
		Equatorial waves propagate to the east in the northern hemisphere, using the equator as a wave guide.
		Coastal Kelvin waves propagate around the northern hemisphere oceans in a counterclockwise direction using the coastline as a wave guide.
	www.oc.nps.navy.mil /webmodules/ENSO/kelvin.html (124 words)

	Water Waves: Kelvin Ship Waves (Site not responding. Last check: 2007-10-10)
		Kelvin is also known to fluid mechanists and aerodynamicists because of his circulation transport theorem.
		This characteristic of ship waves is due to the fact that water waves in water of moderate depth are dispersive, i.e., their wave speed depends on their length or their frequency.
		The Kelvin waves are actually a wavepacket which is traveling with the so-called "group velocity".
	www.fluidmech.net /tutorials/ocean/k_waves.htm (270 words)

	dmodel
		The red signal is the Kelvin wave which propagates with a positive sea surface height anomaly and thus deepens the thermocline in the eastern Pacific.
		The blue-green signal is the Rossby wave which propagates with a negative sea surface height anomaly and thus rises the thermocline in the western Pacific.
		During its westward propagation, the Rossby wave is hidden from the coupled problem, but as the reflected upwelling Kevin wave crosses the coupled region, it reenters the coupled problem after a time delay equal to their transit time.
	orca.rsmas.miami.edu /~melicie/dmodel1.htm (571 words)

	AMS Glossary
		For a homogeneous ocean, the wave is called a barotropic or external Kelvin wave, and for a stratified ocean, the wave is called a baroclinic or internal Kelvin wave.
		Near a boundary in a rotating system, a Kelvin wave propagates with wave crests perpendicular to the side wall and wave height greatest at the side wall to the right of an observer looking in the direction of wave propagation.
		The wave height decreases exponentially from the side wall with an e-folding length scale equal to the Rossby radius of deformation c/f, in which f is the Coriolis parameter and c is the phase speed of the wave in the along-boundary direction.
	amsglossary.allenpress.com /glossary/search?id=kelvin-wave1 (233 words)

	[No title]
		The Kelvin wave, travelling to the east at the shallow water wave speed, is a bump symmetric at the equator that is characterized by eastward currents decaying in magnitude away from the equator.
		The long Rossby wave travels to the west at a speed that is 1/3 of the speed of the Kelvin wave.
		The energy that is not reflected or dissipated propagates poleward along the boundary as Kelvin waves.
	www.atmos.washington.edu /~david/ATM560/april_24.html (1584 words)

	Kelvin Waves (Site not responding. Last check: 2007-10-10)
		The amplitude of the Kelvin wave is several tens of meters along the thermocline, and the length of the wave is thousands of kilometers (1 degree of longitude = 111 km)
		The figure at the right shows Kelvin waves inside the ocean, computed with temperature data from moored buoys operated by NOAA.
		Other Kelvin waves are visible after El Niño developed; the first two, however, were early indicators that an El Niño would probably occur this year.
	www.tsgc.utexas.edu /topex/activities/elnino/sld013.html (198 words)

	Adjustment of a symmetric mass anomaly
		During this propagation its gradients are steepening and a Kelvin bore is formed as predicted by Boyd (1980, [#!B80b!#]) and Ripa (1982, [#!R82!#]).
		This wave is rapidly leaving the computation domain and the resulting effect on the tracer field consists in a reversible Stokes drift with the same meridional structure as predicted by Li at al.
		Noticeably, the Kelvin wave induced drift and the Rossby wave trapping are acting in the opposite direction so that the tracer at the location of the perturbation is stretched in the
	gershwin.ens.fr /lesommer/papers/eqRSWtransport/node13.html (318 words)

	Class Notes April 26
		The coastal Kelvin wave explains the energy difference between the incoming Equatorial Kelvin wave and the reflected Rossby wave, and starts from the critical latitude of each meridional mode.
		Reflected Long Rossby wave ----------------------------- As the zonal scale is much greater than the meridional scale near the Equator (k much less than l), the Rossby wave dispersion relation tells us that the phase speed of the long Rossby wave is approximately w/k=U-beta/l^2.
		Kelvin Wave reflected from the Island chains in the Western Pacific --------------------------------------------- The eastern boundary in the tropical Pacific is almost solid wall, but we have the island chains for the western boundary.
	www.atmos.washington.edu /~david/ATM560/april_26.html (771 words)

	The delayed oscillator: Evolution of Kelvin and Rossby waves
		This means that a Kelvin wave will cross the Pacific Ocean, which extends from approximately 120° East to 80° West (17,760 Kilometers in distance), in about 70 days.
		By day 125 (Figure 7), the Rossby wave has reached the western boundary and is starting to reflect as a same-signed Kelvin wave.
		Over the period from day 125 to day 275 the Kelvin wave propagates from the western to the eastern boundary resulting in negative sea surface height anomalies along the equator in the east.
	iri.columbia.edu /climate/ENSO/theory/evolution.html (385 words)

	Now October! General Thoughts on Pacific - Eastern US Weather Forums
		first of all our kelvin wave is nearing 160W and will continue to move steadily onward and weaken (but not die! it will make it to S. America and then hit land and move outward) as they usually do once they cross the DL and encounter stronger easterlies/cooler sst.
		MRG forecasts also inline w/ the kelvin wave propogation and general longtitude "death" that soon the engine for the convective modes in the pacific will begin to weaken some....
		The average of 45 days to MJO wave may actually suit the current situation, although w/ the recent jump in position from sep 30 to OCT 1 and kelvin/rossby/grvity wave forecasts it may actually be quicker than normal.
	www.easternuswx.com /bb/index.php?showtopic=107948 (3385 words)

	Gallery of Fluid Mechanics: Kelvin Ship Waves (Site not responding. Last check: 2007-10-10)
		One of the many successes of the theory of dispersive waves is the explanation of the distinctive wave patterns form by ships, waterfowl, and fishing lines in relatively deep water.
		In addition to being aesthetically pleasing, these waves are a source of wave drag; as a result, the study of these waves is of critical practical importance.
		An example of Kelvin waves on a small motorboat can be found by clicking at the highlighted text.
	www.eng.vt.edu /fluids/msc/gallery/waves/ksw.htm (287 words)

	Chapter 6
		If water is transported towards the African continent (via the equatorial wave guide) as an internal Kelvin wave, it should be possible to trace the wave from its origin, along the equator and southwards parallel to the coast.
		The wave produces a disturbance at the sea surface, hence a signal would appear in the satellite measurements.
		An internal Kelvin wave may need one month to cross the Atlantic Ocean, but inertial forces are far less in the atmosphere than in the ocean, hence wind patterns will respond to external forces much faster.
	www.coaps.fsu.edu /~erik/Master/Discussion.html (2587 words)

	Dynamic Tides – In contrast to “static” theory, the dynamic theory of tides recognizes that water covers only ...
		When a reflected wave meets a new wave still advancing toward the boundary, their combination (depending on wave period, size and shape of the basin) can lead to a standing wave – a waveform that doesn’t go anywhere but merely oscillates up and down like a seesaw.
		Roughly speaking, you have a Kelvin wave – or a trapped wave as it is sometimes called - in your coffee cup when you swirl it to the left or right.
		These rotary waves comprise what is known as an amphidromic system, a system that characteristically features a central point (the amphidromic point) where there is no vertical tide, combined with a tide wave of a certain amplitude sweeping around the perimeter of the system once every twelve (lunar) hours.
	www.vims.edu /physical/research/TCTutorial/dynamic.htm (634 words)

	Zoom Astronomy Glossary: K
		Lord Kelvin (William Thompson, 1824 - 1907) designed the Kelvin scale, in which 0 K is defined as absolute zero and the size of one degree is the same as the size of one degree Celsius.
		Kelvin is a temperature scale designed so that 0K is defined as absolute zero and the size of one unit is the same as the size of one degree Celsius.
		The Kelvin wave is a gentle but huge swell of warm water in the Pacific Ocean.
	www.enchantedlearning.com /subjects/astronomy/glossary/indexk.shtml (1112 words)

	Introduction to Rossby waves
		Rossby waves, also known as planetary waves as they owe their origin to the shape and rotation of the earth, are one of the most intriguing natural phenomena.
		In any case, their horizontal scale is of the order of hundreds of km, while the amplitude of the oscillation at the sea surface is just a few centimeters, practically impossible to measure with in-situ techniques.
		Given that Rossby waves travel almost zonally, it is possible to observe them by taking zonal (west-east) sections of Sea Surface Height Anomalies from each orbital cycle and piling them up into a longitude-time plot (also known as a Hovmöller diagram).
	www.soc.soton.ac.uk /JRD/SAT/Rossby/Rossbyintro.html (720 words)

	A Curious Pacific Wave
		Usually not much happens when a Kelvin wave arrives -- beach combers experience a bit of extra rain, perhaps, and slightly warmer surf.
		El Niños and Kelvin waves are both triggered by winds -- or a lack thereof -- in the Pacific Ocean.
		Kelvin waves carry water from the warm pool toward the Americas.
	science.nasa.gov /headlines/y2002/05mar_kelvinwave.htm (1309 words)

	Behavior of a Moist Kelvin Wave Packet with Nonlinear Heating (Site not responding. Last check: 2007-10-10)
		The effects of nonlinear (positive only or conditional) heating on moist Kelvin waves are examined with a simple equatorial zonal-plane model describing the gravest baroclinic mode.
		A typical amplifying, eastward-moving wave packet is characterized by an asymmetric structure: 1) the ascending branch (wet region) is much narrower than the two descending ones (dry regions); and 2) the circulation cell to the east of the wet region center is smaller and stronger than its counterpart to the west of the center.
		The wet-dry asymmetry is primarily caused by the nonlinear heating effect, while the east-west asymmetry is a result of the movement of the wave packet relative to mean flow.
	www.cpc.ncep.noaa.gov /products/people/yxue/pub/3.html (319 words)

	Areté Associates - Kelvin Wave Analysis
		Kelvin waves arise from surface ships of all sizes and also from shallow submerged vessels and protruding masts.
		Kelvin waves are observable to imaging systems by the same physics that make any surface wave observable, principally through wave-slope effects.
		A Kelvin wave matched filter applied to a sequence of 8 frames (spanning only 8 seconds) formed as sub-apertures of the SAR image extracted the filtered wave pattern shown to the right.
	www.arete.com /index.php?view=kelvin (342 words)

	Kelvin Wave and El Niño (Site not responding. Last check: 2007-10-10)
		Because a Kelvin wave is associated with density fluctuations inside the ocean, it can be seen in the sea-level measurements made by altimeters, although with a reduced magnitude.
		Notice the two Kelvin waves, with amplitudes from 10 to 15 cm at sea-level compared to 30 and 40 meters in the thermocline change.
		The Kelvin waves travel east and set up changes in the eastern Pacific that lead to El Niño by depressing the thermocline there.
	www.tsgc.utexas.edu /topex/activities/elnino/sld014.html (141 words)

Try your search on: Qwika (all wikis)