- 行业: Weather
- Number of terms: 60695
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The American Meteorological Society promotes the development and dissemination of information and education on the atmospheric and related oceanic and hydrologic sciences and the advancement of their professional applications. Founded in 1919, AMS has a membership of more than 14,000 professionals, ...
In a direction that lies within the plane of an isopycnal surface. The epipycnal direction is close to horizontal.
Industry:Weather
Mixing of fluid in an epipycnal direction, that is, mixing of fluid with adjacent fluid from the same density surface.
Industry:Weather
In the context of air pollution, a time period during which pollution standards are exceeded or, more loosely, during which pollutant levels are significantly greater than normal or background levels.
Industry:Weather
Levels of criteria pollutants that, when exceeded, constitute a smog alert as set by the state of California. Such levels are regarded as being dangerous to certain portions of the population if experienced for a short time.
Industry:Weather
The state or process wherein one crystalline material builds up a layer (usually thin) of its own crystal lattice upon the surface of some other crystal with a lattice geometry similar in crystal symmetry and lattice spacing to its own. A close match of lattice geometry gives rise to ice nucleation, at only a few degrees below 0°C, whereas a small water drop may normally supercool some tens of degrees K. The effect has been demonstrated for water vapor growth to ice crystals and freezing of supercooled droplets on large single crystals, oriented with respect to the base common occurrence crystal such as silver iodide. Molecule size and structure also influence the effect.
Industry:Weather
The state or process wherein one crystalline material builds up a layer (usually thin) of its own crystal lattice upon the surface of some other crystal with a lattice geometry similar in crystal symmetry and lattice spacing to its own. A close match of lattice geometry gives rise to ice nucleation, at only a few degrees below 0°C, whereas a small water drop may normally supercool some tens of degrees K. The effect has been demonstrated for water vapor growth to ice crystals and freezing of supercooled droplets on large single crystals, oriented with respect to the base common occurrence crystal such as silver iodide. Molecule size and structure also influence the effect.
Industry:Weather
The wave height that is exceeded on average only once in a specified period, usually 50 or 100 years. It is often used as a basis for the design wave. See extreme value distribution.
Industry:Weather
In meteorology, usually the “eye of the storm” (hurricane, typhoon), that is, the roughly circular area of comparatively light winds found at the center of a severe tropical cyclone and surrounded by the eyewall. The winds increase gradually outward from the center but can remain very light up to the inner edge of the eyewall. No rain occurs and in intense tropical cyclones the eye is clear with blue sky overhead. Most, but not all, tropical cyclones with maximum winds in excess of 40 m s−1(78 knots) have eyes visible on satellite imagery. Eye diameters vary from 10 to more than 100 km.
Industry:Weather
A ring of cumulonimbus that encircles the eye of a tropical cyclone. In radar depictions, the clouds must occupy at least 180° of arc to be called an eyewall.
Industry:Weather
In climatology, the highest and, in some cases, the lowest value of a climatic element observed during a given time interval or during a given month or season of that period. If this value were the greatest extreme for the whole period of record for which observations are available, the value would be the absolute extreme.
Industry:Weather
