Subsidence by collapse
This commonly occurs over man-made voids, such as tunnels, wells and covered quarries. It is also frequent in karst terrains, where dissolution of limestone by fluid flow in the subsurface causes the creation of voids (i.e. caves).
Subsidence - Sinking (downward) motion in the atmosphere, usually over a broad area.
Sub-synoptic Low - Essentially the same as mesolow.
Subsidence - Sinking air.
Supercooled water - Water that is below the freezing temperature but is still in liquid form.
Synoptic scale - A large scale event that is usually measured in hundreds to thousands of kilometers and days to weeks; e.g. fronts, cyclones, and anticyclones.
Subsidence - a large area with decending air. Often free of clouds.
Supercooled - any liquid which remains liquid below its normal freezing point.
Synoptic scale - the size of features which take a day or more to pass. They are usually a thousand miles or so across.
SUBSIDENCE: Sinking air that is associated with warming air and little cloud formation.
SUBTROPICAL JET: The branch of the jet stream that is found in the lower latitudes.
SUSTAINED WINDS: The wind speed obtained by averaging the observed values over a one minute period.
~ inversion - An increase in temperature with height produced by the adiabatic warming of a layer of subsiding air. This inversion is enhanced by vertical mixing in the air layer below the inversion.
~ The slow sinking of air, usually associated with high-pressure areas.
~ inversion A temperature inversion produced by compressional warming - the adiabatic warming of a layer of sinking air.
~ Inversion It is produced by adiabatic heating of air as it sinks and is associated with anticyclones (high pressure) and/or stable air masses.
1. A descending motion of air in the atmosphere occurring over a rather broad area.
2. In hydrologic terms, sinking down of part of the earth's crust due to underground excavation, such as the removal of groundwater.
~ Inversion ...
A sinking or downward motion of air, often seen in anticyclones. It is most prevalent when there is colder, denser air aloft. It is often used to imply the opposite of atmospheric convection.
~- The descent of a body of air, usually in a high pressure area, that warms the lower levels of air.
Supercooled Water- Water cooled to a temperature of less than 32 degrees Fahrenheit without freezing.
Thermometer- An instrument for measuring temperature.
~ - Downward moving (sinking) air over a broad area that is associated with warming air and little cloud formation.
~ - Sinking air in the atmosphere. Downward convection can also be called subsidence. Common in stable air and in temperature inversions.
SUBSONIC - Slower than the speed of sound.
~The slow sinking of air, usually associated with high-pressure areas.sun pillarA vertical streak of light extending above (or below) the sun. It is produced by the reflection of sunlight of ice crystals.
A return flow aloft and subsidence over the eastern ocean complete the cell. water stress effect The closing of the stomata by a plant in response to excessive water loss through transpiration or in response to drought conditions.
To compensate for the resulting "excess," vertical motion may result: upward forcing if convergence is at low levels, or downward forcing (subsidence) if convergence is at high levels.
This descent is called "subsidence". The subsiding air warms up, its relative humidity falls, and fine weather is the usual accompaniment of subsidence, though fog, stratus or stratocumulus clouds may occur under certain conditions. The contrary case is called convergence.
This weather balloon trace below shows a subsidence inversion or a layer of warm air that on calm days will trap smoke and pollution in the lower part of the atmosphere. The warm air is a layer approximately 350metres thick, starting at the 0.6 km level.
NOAA National Weather Service - Cite This Source - This Definition
Browse Related Terms: Convergence, DVV, Ferrel Cell, Friction, Looping, stability, Subsidence, VRT MOTN
SC - permalink - collapse ...
They are produced by the interaction of a saturated stable air layer, usually an inversion, and a pattern of vertical wind shear, which results in somewhat evenly spaced zones of updraft (where cloud tops crest in a wave-like pattern) and subsidence (where cloud droplets evaporate as they descind ...
In both winter and summer the central pressure lies around 1024 mbar (hPa), but conditions are more variable in winter. The aridity of the Sahara Desert and the adjacent Mediterranean region is due to the subsidence of air in this high-pressure system.
Weather Facts ...
Motions in a fluid that transport and mix the properties of the fluid. These properties could be heat and/or moisture. When used to imply only upward vertical motion, it is then the opposite of subsidence.
CONVECTIVE CONDENSATION LEVEL (CCL) ...
heat energy is required to melt and evaporate the precipitation particles contained within the sinking air, the warming produced by the sinking motion is quickly used up in the evaporation of precipitation particles. If more energy is required for evaporation than is generated by the subsidence, ...
Convergence in a horizontal wind field indicates that more air is entering a given area than is leaving at that level. To compensate for the resulting "excess," vertical motion may result: upward forcing if convergence is at low levels, or downward forcing (subsidence) if convergence is at high ...
WARM CORE LOW- A low pressure which is deepest at the surface and gradually weakens in the vertical. Warm core lows have warm temperatures near their center due to either surface solar warming. large amounts of latent heat release or subsidence.
Examples of inversions include those due to anticyclonic subsidence; cooling land by night (nocturnal inversions); and sea-breeze inversions, where cooler sea air under-cuts warmer land air.
There are four common causes of a temperature inversion: radiational cooling, advection of warm air over cold air as in frontal situations, advection of warm air over a cold surface such as snow or ice, and subsidence, the sinking of air which is then warmed by compression.
In recent years, a rapid rise of coastal aquaculture industry has occurred in southwestern Taiwan. Massive extraction of groundwater for aquaculture purposes has caused strata subsidence, which has resulted in salt water intrusion that often leads to serious disasters.
It is often caused by a shallow submarine earthquake but can also be caused by submarine earth movement, subsidence, or volcanic eruption
The vertical motion of the air, at times violent, which can cause the up-and-down movement of a plane.
It is often used to imply only upward vertical motion and then it is the opposite of subsidence. CONVECTIVE CONDENSATION LEVEL (CCL) The height at which a parcel of air, if heated sufficiently from below, will rise adiabatically until it is just saturated.
See also: What is the meaning of Weather, Temperature, Surface, Air, Pressure?