- 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 solar daily magnetic variations on quiet days. It is determined from the records at geomagnetic stations for days that are believed free of noncyclic disturbances.
Industry:Weather
The SI unit of solid angle that, having its vertex in the center of a sphere, cuts off an area of the surface of the sphere equal to that of a square with sides of length equal to the radius of the sphere. There are 4π steradians in a sphere.
Industry:Weather
The season of the year composing the transition period from winter to summer; the vernal season, during which the sun is approaching the summer solstice. In popular usage and for most meteorological purposes, spring is customarily taken to include the months of March, April, and May in the Northern Hemisphere, and September, October, and November in the Southern Hemisphere. Except in the Tropics, spring is a season of rising temperatures and decreasing cyclonic activity over continents. In much of the Tropics, neither spring nor fall is recognizable, and in polar regions, both are very short-lived.
Industry:Weather
The SI derived unit of pressure. One pascal (Pa) is equal to 1 newton m<sup>−2</sup>. The kilopascal (kPa) is the preferred unit for atmospheric pressure, but the more familiar millibar (mb) is the unit of pressure generally used by meteorologists, by international agreement; 1 mb = 1 hPa (hectopascal). For a typical sea level pressure, 102. 345 kPa = 1023. 45 hPa = 1023. 45 mb.
Industry:Weather
The severe, gusty east-northeast wind in the vicinity of the Stikine River near Wrangell, Alaska. It is produced under the same conditions as a Taku wind.
Industry:Weather
The set of all atmospheric states or solutions to a forecast model that evolve slowly with time.
Industry:Weather
The sequence of climatic changes in geologic time. It shows a succession of oscillations between warm periods and ice ages, but superimposed on this are numerous shorter oscillations. The tendency to regard the whole of a geologic period, lasting for 20 million years and more, as having a single type of climate is a great oversimplification, as is shown by the succession of glacial and interglacial periods in the Quaternary. Even the warm periods are known to have been made up of successions of climates of different degrees of warmth; but until much more information is available, it will not be possible to set out in detail the sequence of changes of the earlier paleoclimates.
Industry:Weather
The science and study of pyrheliometric measurements. See pyrheliometer.
Industry:Weather
The science and techniques associated with psychrometric measurements. See psychrometer.
Industry:Weather
The science of the production, composition, transport, and deposition of sediment.
Industry:Weather
