- 行业: Weather
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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, ...
The measurement of current by an instrument fixed in space, for example, a moored current meter or a bottom-mounted acoustic Doppler current profiler. The Eulerian current is computed by averaging the measured fluid velocity over a suitable interval (usually a few minutes).
Industry:Weather
The correlation between the properties of a flow at various points in space at a single instant in time. Compare Lagrangian correlation; see correlation coefficient.
Industry:Weather
Any system of coordinates in which properties of a fluid are assigned to points in space at each given time, without attempt to identify individual fluid parcels from one time to the next. Since most observations in meteorology are made locally at specified time intervals, an Eulerian system is usually, though by no means always, more convenient. A sequence of synoptic charts is an Eulerian representation of the data. Eulerian coordinates are to be distinguished from Lagrangian coordinates. The particular coordinate system used to identify points in space (Cartesian, cylindrical, spherical, etc. ) is quite independent of whether the representation is Eulerian or Lagrangian. See equations of motion.
Industry:Weather
Simplest alkene, formula C2H4; a major emission of fossil fuel combustion, particularly automobiles. It is also emitted from oceans, vegetation, and as a product of biomass burning.
Industry:Weather
Second member of the alkane family, formula C2H6, ethane is a naturally occurring hydrocarbon produced from natural gas, biomass burning, ocean, and terrestrial vegetation. It is fairly unreactive and some can be transported to the stratosphere.
Industry:Weather
The prevailing northerly winds in summer in the eastern Mediterranean and especially the Aegean Sea; basically similar to monsoon and equivalent to the maestro of the Adriatic Sea. According to the ancient Greeks, the etesians blow for 40 days, beginning with the heliacal rising of Sirius. They are associated (along with the seistan and shamal) with the deep low pressure area that forms in summer over northwest India. They bring clear skies and dry, relatively cool weather. In Greece the etesian wind is locally named the sleeper. In Turkey it is the meltém. The Romans used the word also for the southwest monsoon of the Arabian Sea.
Industry:Weather
1. The portion of a river that is affected by tides. 2. A semi-enclosed body of water where the salinity of ocean water is measurably reduced by freshwater input. Estuaries are very important nursery regions for many coastal ocean species of fish and invertebrates.
Industry:Weather
After U. S. Weather observing practice, the ceiling classification applied to a ceiling height that is determined in any of the following ways: 1) by means of a convective-cloud height diagram or dewpoint formula; 2) from the known heights of unobscured portions of natural landmarks, or objects more than one and one-half nautical miles from any runway of the airport; 3) on the basis of observational experience, provided the sky is not obscured by surface-based hydrometeors or lithometeors, and other guides are lacking or considered unreliable; or 4) determined by ceilometer or ceiling light when the penetration of the light beam is in excess of normal for the particular height and type of layer, or when the elevation angle of the clinometer or ceilometer-detector scanner exceeds 84°. Such a ceiling is denoted E in aviation weather reports.
Industry:Weather
The first series of operational meteorological satellites launched by the United States. Based on the earlier TIROS series of satellites, the nine satellites launched between 1966 and 1969 are often referred to as the TIROS Operational System.
Industry:Weather
